CN103893988B

CN103893988B - Methanol fractionation system steam automatic voltage stabilization and control device and control method thereof

Info

Publication number: CN103893988B
Application number: CN201410143895.4A
Authority: CN
Inventors: 顾朝晖; 樊安静; 郭秀红; 乔洁; 杨安成; 徐严伟; 王亚乐
Original assignee: Henan Xinlianxin Fertilizer Co Ltd
Current assignee: Jiangxi Xinlianxin Chemical Industry Co ltd; Xinjiang Xinlianxin Energy Chemical Co ltd; Henan Xinlianxin Chemicals Group Co Ltd
Priority date: 2014-04-10
Filing date: 2014-04-10
Publication date: 2015-09-23
Anticipated expiration: 2034-04-10
Also published as: CN103893988A

Abstract

The present invention relates to a kind of methanol fractionation system steam automatic voltage stabilization and control device and control method thereof, comprise methanol rectification pipeline, steam working line and Control System of Microcomputer, methanol rectification pipeline is comprised crude carbinol pipeline and is connected with the import on pre-rectifying tower top by thick alcohol charging control valve, steam working line comprises Medium Pressure Steam Pipeline and low-pressure steam pipeline, Control System of Microcomputer comprises model predictive controller, model predictive controller and DCS main controller, this control method comprises the control method of steam buffer pressure tank, the control method of pre-rectifying tower return tank liquid level, the control method of pre-rectifying tower column bottom temperature, the control method of liquid level at the bottom of pre-rectifying tower tower, the control method of atmospheric tower tower top temperature, the control method of atmospheric tower column bottom temperature, the control method of pressurizing tower tower top temperature and pressurization column bottom temperature, the control method of atmospheric tower reflux ratio and the control method of pressurizing tower reflux ratio, there is in good time adjusting device load, reduce the advantage of steam consumption.

Description

Methanol fractionation system steam automatic voltage stabilization and control device and control method thereof

Technical field

The invention belongs to steam automatic voltage regulation technical field, be specifically related to a kind of methanol fractionation system steam automatic voltage stabilization and control device and control method thereof.

Background technology

In nitrogenous fertilizer system, the production that the heat utilizing system unnecessary carries out byproduct is general.Namely methanol fractionation system is utilize the low-quality steam of thermoelectric plant to carry out distillation process, but owing to being the utilization to system waste heat, its low-pressure steam calorific value is inadequate, a certain amount of middle pressure steam of need providing and delivering.But only use middle pressure steam is then a kind of significant wastage to low-pressure steam.Simultaneously in steam use procedure, two-way steam can impact rectifier unit due to the load fluctuation of upper workshop section, and cause each tower temperature sharply to change, affect product quality, steam consumption also increases.

Summary of the invention

The object of the invention is to overcome defect of the prior art, and provide one automatically can detect middle pressure steam and the change of low-pressure steam pressure, two bursts of steam sequencing valve apertures are controlled, use low-pressure steam to greatest extent, save middle pressure steam use amount, in good time adjusting device load, reaches Appropriate application steam, reduces methanol fractionation system steam automatic voltage stabilization and control device and the control method thereof of steam consumption.

The object of the present invention is achieved like this: comprise methanol rectification pipeline, steam working line and Control System of Microcomputer,

A, methanol rectification pipeline is comprised crude carbinol pipeline and is connected with the import on pre-rectifying tower top by thick alcohol charging control valve, the gaseous phase outlet at pre-rectifying tower top is connected with pre-rectifying tower backflash by pipeline, pre-rectifying tower backflash is connected with the pre-rectifying tower refluxing opening on pre-rectifying tower top by reflux pump, pre-rectifying tower first liquid-phase outlet and the outlet of pre-rectifying tower second liquid phase is provided with bottom described pre-rectifying tower, pre-rectifying tower first liquid-phase outlet is connected with the import in the middle part of pre-rectifying tower by the tube side of pre-rectifying tower reboiler, the outlet of pre-rectifying tower second liquid phase is connected with the import in the middle part of pressurizing tower by pipeline, the gaseous phase outlet at pressurizing tower top is connected with the import of pressurizing tower backflash by the shell side of atmospheric tower reboiler, pressurizing tower backflash is provided with pressurizing tower backflash first outlet and pressurizing tower backflash second exports, pressurizing tower backflash first is exported and is connected with the pressurizing tower refluxing opening on pressurizing tower top by pressurizing tower return flow meter, pressurizing tower backflash second is exported and is connected with product storage tank with pressurizing tower extraction flowmeter by pressurizing tower extraction flow control valve, pressurizing tower first liquid-phase outlet and the outlet of pressurizing tower second liquid phase is provided with bottom pressurizing tower, pressurizing tower first liquid-phase outlet is connected with the import of pressurizing tower middle and lower part by the tube side of pressurizing tower reboiler, the outlet of pressurizing tower second liquid phase is connected with the import in the middle part of atmospheric tower by Liquid level adjusting valve at the bottom of pressurizing tower tower, the gaseous phase outlet at atmospheric tower top is connected by the import of pipeline with atmospheric tower backflash, atmospheric tower backflash is provided with atmospheric tower backflash first outlet and atmospheric tower backflash second exports, atmospheric tower backflash first is exported and is connected with the atmospheric tower refluxing opening on atmospheric tower top with atmospheric tower return flow meter by atmospheric tower return valve, atmospheric tower backflash second is exported and is connected with product storage tank with atmospheric tower extraction flowmeter by atmospheric tower extraction flow control valve, atmospheric tower bottoms is provided with atmospheric tower first liquid-phase outlet and the outlet of atmospheric tower second liquid phase, atmospheric tower first liquid-phase outlet is connected with the import of atmospheric tower middle and lower part by the tube side of atmospheric tower reboiler, the outlet of atmospheric tower second liquid phase is connected with thermoelectricity combustion pipe, the bottom of described pre-rectifying tower is provided with pre-rectifying tower column bottom temperature sensor, the bottom of pre-rectifying tower is provided with liquid level gauge at the bottom of pre-rectifying tower tower, the bottom of described pre-rectifying tower backflash is provided with pre-rectifying tower backflash liquid level gauge, the top of pressurizing tower is provided with pressurizing tower tower top temperature sensor, the bottom of pressurizing tower is provided with pressurizing tower column bottom temperature sensor, the top of atmospheric tower is provided with atmospheric tower tower top temperature sensor, and the bottom of atmospheric tower is provided with atmospheric tower column bottom temperature sensor,

B, steam working line comprises Medium Pressure Steam Pipeline and low-pressure steam pipeline, Medium Pressure Steam Pipeline is connected with steam buffer tank respectively with low-pressure steam pipeline, the steam (vapor) outlet of steam buffer tank top is connected with the shell side import of pre-rectifying tower reboiler by pipeline, threeway is provided with between the shell side import of steam (vapor) outlet and pre-rectifying tower reboiler, threeway first end is connected with steam (vapor) outlet, threeway second end is connected with the shell side import of pre-rectifying tower reboiler by pipeline, threeway the 3rd end is connected with the shell side import of pressurizing tower reboiler by pipeline, the shell-side outlet of pre-rectifying tower reboiler is connected with condensate draining respectively by pipeline with the shell-side outlet of pressurizing tower reboiler, middle pressure steam control valve is provided with between described Medium Pressure Steam Pipeline and steam buffer tank, middle pressure steam pressure sensor and middle pressure steam temperature sensor, low-pressure steam control valve is provided with, low-pressure steam pressure sensor and low-pressure steam temperature sensor between described low-pressure steam pipeline and steam buffer tank, pipeline between described threeway second end and the shell side import of pre-rectifying tower reboiler is provided with pre-rectifying tower tower bottom steam control valve, pipeline between threeway the 3rd end and the shell side import of pressurizing tower reboiler is provided with pressurizing tower tower bottom steam control valve, described steam buffer tank top is provided with steam buffer pressure tank sensor and steam buffer tank temperature sensor,

C, Control System of Microcomputer comprises model predictive controller, model predictive controller and DCS main controller, described DCS main controller is connected with DCS database, described DCS database respectively with steam buffer pressure tank sensor, pre-rectifying tower backflash liquid level gauge, pre-rectifying tower column bottom temperature sensor, liquid level gauge at the bottom of pre-rectifying tower tower, atmospheric tower tower top temperature sensor, atmospheric tower column bottom temperature sensor, pressurizing tower tower top temperature sensor, pressurizing tower column bottom temperature sensor, pressurizing tower return flow meter, pressurizing tower extraction flowmeter, atmospheric tower return flow meter and atmospheric tower extraction flowmeter, described DCS main controller respectively with Liquid level adjusting valve and pressurizing tower tower bottom steam control valve, atmospheric tower extraction flow control valve and pressurizing tower extraction flow control valve at the bottom of middle pressure steam control valve, pre-rectifying tower tower bottom steam control valve, thick alcohol charging control valve, atmospheric tower return valve, pressurizing tower tower.

A kind of control method of methanol fractionation system steam automatic voltage stabilization and control device, this control method comprises the control method of steam buffer pressure tank, the control method of pre-rectifying tower return tank liquid level, the control method of pre-rectifying tower column bottom temperature, the control method of liquid level at the bottom of pre-rectifying tower tower, the control method of atmospheric tower tower top temperature, the control method of atmospheric tower column bottom temperature, the control method of pressurizing tower tower top temperature and pressurization column bottom temperature, the control method of atmospheric tower reflux ratio and the control method of pressurizing tower reflux ratio;

A, steam buffer pressure tank control method comprise the steps:

One, steam buffer pressure tank sensor detects the pressure of steam buffer tank, and the normally-pressured neighbor of steam buffer tank is between 0.28 ~ 0.32MPa, and now low-pressure steam control valve is in full-gear, and the aperture of middle pressure steam control valve is 40%;

Two, steam buffer pressure tank sensor detects the pressure of steam buffer tank, when the pressure of steam buffer tank is lower than 0.28MPa, the pressure data of steam buffer tank is fed back to DCS database by steam buffer pressure tank sensor, and DCS database passes through DCS main controller by data feedback to model predictive controller;

Three, by feed back to model predictive controller in step 2 data analysis after, model predictive controller controls middle pressure steam control valve by DCS main controller, be that 40% to adjust to aperture be 70% by middle pressure steam control valve by aperture in step one, make the pressure increase of steam buffer tank to 0.28MPa; When the pressure increase of steam buffer tank is to 0.28MPa, model predictive controller makes the aperture of middle pressure steam control valve adjust to 40% by DCS main controller;

Four, steam buffer pressure tank sensor detects the pressure of steam buffer tank, when the pressure of steam buffer tank is higher than 0.32MPa, the pressure data of steam buffer tank is fed back to DCS database by steam buffer pressure tank sensor, and DCS database passes through DCS main controller by data feedback to model predictive controller;

Five, by feed back to model predictive controller in step 4 data analysis after, model predictive controller controls middle pressure steam control valve by DCS main controller, be that 40% to adjust to aperture be 20% by middle pressure steam control valve by aperture in step one, make the pressure drop of steam buffer tank to 0.32MPa; When the pressure drop of steam buffer tank is to 0.32MPa, model predictive controller makes the aperture of middle pressure steam control valve adjust to 40% by DCS main controller;

B, pre-rectifying tower return tank liquid level controlling method comprise the steps:

One, pre-rectifying tower backflash liquid level gauge detects the liquid level of pre-rectifying tower backflash, and the liquid level normal range (NR) of pre-rectifying tower backflash is between 100 ~ 120mm, and now the aperture of pre-rectifying tower tower bottom steam control valve is 19%;

Two, pre-rectifying tower backflash liquid level gauge detects the liquid level of pre-rectifying tower backflash, when the liquid level of pre-rectifying tower backflash is lower than 100mm, liquid level data in pre-rectifying tower backflash is fed back to DCS database by pre-rectifying tower backflash liquid level gauge, and DCS database passes through DCS main controller by data feedback to model predictive controller;

Three, by feed back to model predictive controller in step 2 data analysis after, model predictive controller controls pre-rectifying tower tower bottom steam control valve by DCS main controller, be that 19% to adjust to aperture be 17% by pre-rectifying tower tower bottom steam control valve by aperture in above-mentioned steps one, after making the liquid level of pre-rectifying tower backflash rise to 100mm, model predictive controller makes the aperture of pre-rectifying tower tower bottom steam control valve adjust to 19% by DCS main controller;

Four, pre-rectifying tower backflash liquid level gauge detects the liquid level of pre-rectifying tower backflash, when the liquid level of pre-rectifying tower backflash is higher than 120mm, liquid level data in pre-rectifying tower backflash is fed back to DCS database by pre-rectifying tower backflash liquid level gauge, and DCS database passes through DCS main controller by data feedback to model predictive controller;

Five, by feed back to model predictive controller in step 4 data analysis after, model predictive controller controls pre-rectifying tower tower bottom steam control valve by DCS main controller, be that 19% to adjust to aperture be 23% by pre-rectifying tower tower bottom steam control valve by aperture in above-mentioned steps one, after making the liquid level of pre-rectifying tower backflash drop to 120mm, model predictive controller makes the aperture of pre-rectifying tower tower bottom steam control valve adjust to 19% by DCS main controller;

C, pre-rectifying tower column bottom temperature control method comprise the steps:

One, pre-rectifying tower column bottom temperature sensor detects the temperature at the bottom of pre-rectifying tower tower, and the temperature normal range (NR) at the bottom of pre-rectifying tower tower is between 74 ~ 75 DEG C, and now the aperture of pre-rectifying tower tower bottom steam control valve is 19%;

Two, pre-rectifying tower column bottom temperature sensor detects the temperature at the bottom of pre-rectifying tower tower, when the temperature at the bottom of pre-rectifying tower tower is lower than 74 DEG C, temperature data at the bottom of pre-rectifying tower tower is fed back to DCS database by pre-rectifying tower column bottom temperature sensor, and DCS database passes through DCS main controller by data feedback to model predictive controller;

Three, by feed back to model predictive controller in step 2 data analysis after, model predictive controller controls pre-rectifying tower tower bottom steam control valve by DCS main controller, be that 19% to adjust to aperture be 19.8% by pre-rectifying tower tower bottom steam control valve by aperture in above-mentioned steps one, after making the temperature at the bottom of pre-rectifying tower tower rise to 74 DEG C, model predictive controller makes the aperture of pre-rectifying tower tower bottom steam control valve adjust to 19% by DCS main controller;

Four, pre-rectifying tower column bottom temperature sensor detects the temperature at the bottom of pre-rectifying tower tower, when the temperature at the bottom of pre-rectifying tower tower is higher than 75 DEG C, temperature data at the bottom of pre-rectifying tower tower is fed back to DCS database by pre-rectifying tower column bottom temperature sensor, and DCS database passes through DCS main controller by data feedback to model predictive controller;

Five, by feed back to model predictive controller in step 4 data analysis after, model predictive controller controls pre-rectifying tower tower bottom steam control valve by DCS main controller, be that 19% to adjust to aperture be 18.5% by pre-rectifying tower tower bottom steam control valve by aperture in above-mentioned steps one, after making the temperature at the bottom of pre-rectifying tower tower drop to 75 DEG C, model predictive controller makes the aperture of pre-rectifying tower tower bottom steam control valve adjust to 19% by DCS main controller;

At the bottom of d, pre-rectifying tower tower, liquid level controlling method comprises the steps:

One, liquid level gauge at the bottom of pre-rectifying tower tower detects the liquid level of pre-rectifying tower, and the liquid level normal range (NR) of pre-rectifying tower is between 100 ~ 120mm, and now the aperture of thick alcohol charging control valve is 58%;

Two, liquid level gauge at the bottom of pre-rectifying tower tower detects the liquid level of pre-rectifying tower, when the liquid level of pre-rectifying tower is lower than 100mm, at the bottom of pre-rectifying tower tower, the liquid level data in pre-rectifying tower is fed back to DCS database by liquid level gauge, and DCS database passes through DCS main controller by data feedback to model predictive controller;

Three, by feed back to model predictive controller in step 2 data analysis after, model predictive controller controls thick alcohol charging control valve by DCS main controller, be that 58% to adjust to aperture be 67% by thick alcohol charging control valve by aperture in above-mentioned steps one, after making the liquid level of pre-rectifying tower rise to 100mm, model predictive controller makes the aperture of thick alcohol charging control valve adjust to 58% by DCS main controller;

Four, liquid level gauge at the bottom of pre-rectifying tower tower detects the liquid level of pre-rectifying tower, when the liquid level of pre-rectifying tower is higher than 120mm, at the bottom of pre-rectifying tower tower, the liquid level data in pre-rectifying tower is fed back to DCS database by liquid level gauge, and DCS database passes through DCS main controller by data feedback to model predictive controller;

Five, by feed back to model predictive controller in step 4 data analysis after, model predictive controller controls thick alcohol charging control valve by DCS main controller, be that 58% to adjust to aperture be 55% by thick alcohol charging control valve by aperture in above-mentioned steps one, after making the liquid level of pre-rectifying tower backflash drop to 120mm, model predictive controller makes the aperture of thick alcohol charging control valve adjust to 58% by DCS main controller;

E, atmospheric tower tower top temperature control method comprise the steps:

One, atmospheric tower tower top temperature sensor detects the temperature of atmospheric tower tower top, and the temperature normal range (NR) of atmospheric tower tower top is between 67 ~ 70 DEG C, and now the aperture of atmospheric tower return valve is 53%;

Two, atmospheric tower tower top temperature sensor detects the temperature of atmospheric tower tower top, when the temperature of atmospheric tower tower top is lower than 67 DEG C, the temperature data of atmospheric tower tower top is fed back to DCS database by atmospheric tower tower top temperature sensor, and DCS database passes through DCS main controller by data feedback to model predictive controller;

Three, by feed back to model predictive controller in step 2 data analysis after, model predictive controller controls atmospheric tower return valve by DCS main controller, be that 53% to adjust to aperture be 50% by atmospheric tower return valve by aperture in above-mentioned steps one, when making the temperature of atmospheric tower tower top rise to 67 DEG C, model predictive controller makes the aperture of atmospheric tower return valve adjust to 53% by DCS main controller;

Four, atmospheric tower tower top temperature sensor detects the temperature of atmospheric tower tower top, when the temperature of atmospheric tower tower top is higher than 70 DEG C, the temperature data of atmospheric tower tower top is fed back to DCS database by atmospheric tower tower top temperature sensor, and DCS database passes through DCS main controller by data feedback to model predictive controller;

Five, by feed back to model predictive controller in step 4 data analysis after, model predictive controller controls atmospheric tower return valve by DCS main controller, be that 53% to adjust to aperture be 55% by atmospheric tower return valve by aperture in above-mentioned steps one, after making the temperature of atmospheric tower tower top drop to 70 DEG C, model predictive controller makes the aperture of atmospheric tower return valve adjust to 53% by DCS main controller;

F, atmospheric tower column bottom temperature control method comprise the steps:

One, atmospheric tower column bottom temperature sensor detects the temperature at the bottom of atmospheric tower tower, and the temperature normal range (NR) at the bottom of atmospheric tower tower is between 108 ~ 110 DEG C, and now at the bottom of pressurizing tower tower, the aperture of Liquid level adjusting valve is 8%;

Two, atmospheric tower column bottom temperature sensor detects the temperature at the bottom of atmospheric tower tower, when the temperature at the bottom of atmospheric tower tower is lower than 108 DEG C, temperature data at the bottom of atmospheric tower tower is fed back to DCS database by atmospheric tower column bottom temperature sensor, and DCS database passes through DCS main controller by data feedback to model predictive controller;

Three, by feed back to model predictive controller in step 2 data analysis after, model predictive controller controls Liquid level adjusting valve at the bottom of pressurizing tower tower by DCS main controller, be that 8% to adjust to aperture be 2% by Liquid level adjusting valve at the bottom of pressurizing tower tower by aperture in above-mentioned steps one, when making the temperature of atmospheric tower tower top rise to 108 DEG C, model predictive controller makes the aperture of Liquid level adjusting valve at the bottom of pressurizing tower tower adjust to 8% by DCS main controller;

Four, atmospheric tower column bottom temperature sensor detects the temperature at the bottom of atmospheric tower tower, when the temperature at the bottom of atmospheric tower tower is higher than 110 DEG C, temperature data at the bottom of atmospheric tower tower is fed back to DCS database by atmospheric tower column bottom temperature sensor, and DCS database passes through DCS main controller by data feedback to model predictive controller;

Five, by feed back to model predictive controller in step 4 data analysis after, model predictive controller controls Liquid level adjusting valve at the bottom of pressurizing tower tower by DCS main controller, be that 8% to adjust to aperture be 10% by Liquid level adjusting valve at the bottom of pressurizing tower tower by aperture in above-mentioned steps one, after making the temperature at the bottom of atmospheric tower tower drop to 110 DEG C, model predictive controller makes the aperture of Liquid level adjusting valve at the bottom of pressurizing tower tower adjust to 8% by DCS main controller;

The control method of g, pressurizing tower tower top temperature and pressurization column bottom temperature comprises the steps:

One, pressurizing tower tower top temperature sensor detects the temperature of pressurizing tower tower top, the temperature normal range (NR) of pressurizing tower tower top is between 118 ~ 121 DEG C, pressurizing tower column bottom temperature sensor detects the temperature at the bottom of pressurizing tower tower, temperature normal range (NR) at the bottom of pressurizing tower tower is between 126 ~ 130 DEG C, wherein, when the temperature at the bottom of pressurizing tower tower reduces, the temperature of pressurizing tower tower top is also along with reduction, when the temperature at the bottom of pressurizing tower tower raises, the temperature of pressurizing tower tower top is also along with rising, and now the aperture of pressurizing tower tower bottom steam control valve is 46%;

Two, pressurizing tower tower top temperature sensor detects the temperature of pressurizing tower tower top, pressurizing tower column bottom temperature sensor detects the temperature at the bottom of pressurizing tower tower, when the temperature at the bottom of pressurizing tower tower is lower than 126 DEG C, temperature data at the bottom of pressurizing tower tower is fed back to DCS database by pressurizing tower column bottom temperature sensor, and DCS database passes through DCS main controller by data feedback to model predictive controller;

Three, by feed back to model predictive controller in step 2 data analysis after, model predictive controller controls pressurizing tower tower bottom steam control valve by DCS main controller, be that 46% to adjust to aperture be 50% by pressurizing tower tower bottom steam control valve by aperture in above-mentioned steps one, when making the temperature at the bottom of pressurizing tower tower rise to 126 DEG C, model predictive controller makes the aperture of pressurizing tower tower bottom steam control valve adjust to 46% by DCS main controller;

Four, pressurizing tower tower top temperature sensor detects the temperature of pressurizing tower tower top, pressurizing tower column bottom temperature sensor detects the temperature at the bottom of pressurizing tower tower, when the temperature at the bottom of pressurizing tower tower is higher than 130 DEG C, temperature data at the bottom of pressurizing tower tower is fed back to DCS database by pressurizing tower column bottom temperature sensor, and DCS database passes through DCS main controller by data feedback to model predictive controller;

Five, by feed back to model predictive controller in step 4 data analysis after, model predictive controller controls pressurizing tower tower bottom steam control valve by DCS main controller, be that 46% to adjust to aperture be 40% by pressurizing tower tower bottom steam control valve by aperture in above-mentioned steps one, after making the temperature at the bottom of pressurizing tower tower drop to 130 DEG C, model predictive controller makes the aperture of Liquid level adjusting valve at the bottom of pressurizing tower tower adjust to 46% by DCS main controller;

The control method of h, atmospheric tower reflux ratio comprises the steps:

One, the return flow of atmospheric tower return flow meter to atmospheric tower detects, the extraction flow of atmospheric tower extraction flowmeter to atmospheric tower detects, the normal ratio of the return flow of above-mentioned atmospheric tower and the extraction flow of atmospheric tower is between 1.0 ~ 1.3, and the aperture of now atmospheric tower extraction flow control valve is 13.5%;

Two, the return flow of atmospheric tower return flow meter to atmospheric tower detects, the extraction flow of atmospheric tower extraction flowmeter to atmospheric tower detects, the ratio of the return flow of atmospheric tower and the extraction flow of atmospheric tower lower than 1.0 time, to the return flow data of atmospheric tower and atmospheric tower extraction flowmeter, the extraction data on flows to atmospheric tower feeds back to DCS database to atmospheric tower return flow meter respectively, and DCS database passes through DCS main controller by data feedback to model predictive controller;

Three, by feed back to model predictive controller in step 2 data analysis after, model predictive controller controls atmospheric tower extraction flow control valve by DCS main controller, be that 13.5% to adjust to aperture be 13% by atmospheric tower extraction flow control valve by aperture in above-mentioned steps one, when the return flow of atmospheric tower rises to 1.0 with the ratio of the extraction flow of atmospheric tower, model predictive controller makes the aperture of atmospheric tower extraction flow control valve adjust to 13.5% by DCS main controller;

Four, the return flow of atmospheric tower return flow meter to atmospheric tower detects, the extraction flow of atmospheric tower extraction flowmeter to atmospheric tower detects, the ratio of the return flow of atmospheric tower and the extraction flow of atmospheric tower higher than 1.3 time, to the return flow data of atmospheric tower and atmospheric tower extraction flowmeter, the extraction data on flows to atmospheric tower feeds back to DCS database to atmospheric tower return flow meter respectively, and DCS database passes through DCS main controller by data feedback to model predictive controller;

Five, by feed back to model predictive controller in step 4 data analysis after, model predictive controller controls atmospheric tower extraction flow control valve by DCS main controller, be that 13.5% to adjust to aperture be 14% by atmospheric tower extraction flow control valve by aperture in above-mentioned steps one, when the return flow of atmospheric tower drops to 1.3 with the ratio of the extraction flow of atmospheric tower, model predictive controller makes the aperture of atmospheric tower extraction flow control valve adjust to 13.5% by DCS main controller;

The control method of i, pressurizing tower reflux ratio comprises the steps:

One, the return flow of pressurizing tower return flow meter to pressurizing tower detects, the extraction flow of pressurizing tower extraction flowmeter to pressurizing tower detects, the normal ratio of the return flow of above-mentioned pressurizing tower and the extraction flow of pressurizing tower is between 2.6 ~ 2.8, and the aperture of now atmospheric tower extraction flow control valve is 34%;

Two, the return flow of pressurizing tower return flow meter to pressurizing tower detects, the extraction flow of pressurizing tower extraction flowmeter to pressurizing tower detects, the ratio of the return flow of pressurizing tower and the extraction flow of pressurizing tower lower than 2.6 time, to the return flow data of pressurizing tower and pressurizing tower extraction flowmeter, the extraction data on flows to pressurizing tower feeds back to DCS database to pressurizing tower return flow meter respectively, and DCS database passes through DCS main controller by data feedback to model predictive controller;

Three, by feed back to model predictive controller in step 2 data analysis after, model predictive controller controls pressurizing tower extraction flow control valve by DCS main controller, be that 34% to adjust to aperture be 30% by pressurizing tower extraction flow control valve by aperture in above-mentioned steps one, when the return flow of pressurizing tower rises to 2.6 with the ratio of the extraction flow of pressurizing tower, model predictive controller makes the aperture of pressurizing tower extraction flow control valve adjust to 34% by DCS main controller;

Four, the return flow of pressurizing tower return flow meter to pressurizing tower detects, the extraction flow of pressurizing tower extraction flowmeter to pressurizing tower detects, the ratio of the return flow of pressurizing tower and the extraction flow of pressurizing tower higher than 2.8 time, to the return flow data of pressurizing tower and pressurizing tower extraction flowmeter, the extraction data on flows to pressurizing tower feeds back to DCS database to pressurizing tower return flow meter respectively, and DCS database passes through DCS main controller by data feedback to model predictive controller;

Five, by feed back to model predictive controller in step 4 data analysis after, model predictive controller controls pressurizing tower extraction flowmeter by DCS main controller, be that 34% to adjust to aperture be 40% by pressurizing tower extraction flowmeter by aperture in above-mentioned steps one, when the return flow of pressurizing tower drops to 2.8 with the ratio of the extraction flow of pressurizing tower, model predictive controller makes the aperture of pressurizing tower extraction flow control valve adjust to 34% by DCS main controller.

The present invention is by arranging steam buffer tank and various checkout gear, the pressure of stabilizing low voltage steam and middle pressure steam can either be realized, again can the fluctuation of look-ahead steam, enable pre-rectifying tower reboiler and pressurizing tower reboiler steam regulation charging valve position in time, reach steam saving, stabilising arrangement is produced and is ensured the object of product quality, make smart alcohol per ton consume quantity of steam and be reduced to 0.72t by 0.75t, to produce 100000 tons of smart alcohol per year, every year can steam saving cost about 450,000 yuan, concrete computational process is: (smart alcohol originally per ton consumes the present smart alcohol per ton of quantity of steam 0.75t-and consumes quantity of steam 0.72t) × (produce 100000 tons of smart alcohol output 10 × 10 per year ⁴) × (steam average price 150t/ unit)=450,000 yuan, have and automatically can detect middle pressure steam and the change of low-pressure steam pressure, low-pressure steam and middle pressure steam sequencing valve aperture are controlled, uses low-pressure steam to greatest extent, save middle pressure steam use amount, in good time adjusting device load, reaches Appropriate application steam, reduces the advantage of steam consumption.

Accompanying drawing explanation

Fig. 1 is structural representation of the present invention;

Fig. 2 is Control System of Microcomputer frame principle figure of the present invention.

Detailed description of the invention

As shown in Figure 1, 2, the present invention includes methanol rectification pipeline, steam working line and Control System of Microcomputer,

A, methanol rectification pipeline is comprised crude carbinol pipeline 1 and is connected with the import on pre-rectifying tower 3 top by thick alcohol charging control valve 2, the gaseous phase outlet at pre-rectifying tower 3 top is connected with pre-rectifying tower backflash 4 by pipeline, pre-rectifying tower backflash 4 is connected with the pre-rectifying tower refluxing opening 6 on pre-rectifying tower 3 top by reflux pump 5, pre-rectifying tower first liquid-phase outlet 7 and pre-rectifying tower second liquid phase outlet 8 is provided with bottom described pre-rectifying tower 3, pre-rectifying tower first liquid-phase outlet 7 is connected with the import in the middle part of pre-rectifying tower 3 by the tube side of pre-rectifying tower reboiler 15, pre-rectifying tower second liquid phase outlet 8 is connected with the import in the middle part of pressurizing tower 9 by pipeline, the gaseous phase outlet at pressurizing tower 9 top is connected with the import of pressurizing tower backflash 11 by the shell side of atmospheric tower reboiler 10, pressurizing tower backflash 11 be provided with pressurizing tower backflash first export 12 and pressurizing tower backflash second export 13, pressurizing tower backflash first is exported 12 and is connected with the pressurizing tower refluxing opening 21 on pressurizing tower top by pressurizing tower return flow meter 14, pressurizing tower backflash second is exported 13 and is connected with product storage tank 44 with pressurizing tower extraction flowmeter 43 by pressurizing tower extraction flow control valve 25, pressurizing tower first liquid-phase outlet 16 and pressurizing tower second liquid phase outlet 17 is provided with bottom pressurizing tower 9, pressurizing tower first liquid-phase outlet 16 is connected with the import of pressurizing tower 9 middle and lower part by the tube side of pressurizing tower reboiler 18, pressurizing tower second liquid phase outlet 17 is connected with the import in the middle part of atmospheric tower 19 by Liquid level adjusting valve 45 at the bottom of pressurizing tower tower, the gaseous phase outlet at atmospheric tower 19 top is connected by the import of pipeline with atmospheric tower backflash 20, atmospheric tower backflash 20 is provided with atmospheric tower backflash first outlet and atmospheric tower backflash second exports, atmospheric tower backflash first is exported and is connected with the atmospheric tower refluxing opening 22 of atmospheric tower return flow meter 47 with atmospheric tower 19 top by atmospheric tower return valve 46, atmospheric tower backflash second is exported and is connected with product storage tank 44 with atmospheric tower extraction flowmeter 49 by atmospheric tower extraction flow control valve 48, atmospheric tower first liquid-phase outlet 23 and atmospheric tower second liquid phase outlet 24 is provided with bottom atmospheric tower 19, atmospheric tower first liquid-phase outlet 23 is connected with the import of atmospheric tower 19 middle and lower part by the tube side of atmospheric tower reboiler 10, atmospheric tower second liquid phase outlet 24 is connected with thermoelectricity combustion pipe 26, the bottom of described pre-rectifying tower 3 is provided with pre-rectifying tower column bottom temperature sensor 50, the bottom of pre-rectifying tower 3 is provided with liquid level gauge 51 at the bottom of pre-rectifying tower tower, the bottom of described pre-rectifying tower backflash 4 is provided with pre-rectifying tower backflash liquid level gauge 52, the top of pressurizing tower 9 is provided with pressurizing tower tower top temperature sensor 53, the bottom of pressurizing tower 9 is provided with pressurizing tower column bottom temperature sensor 54, the top of atmospheric tower 19 is provided with atmospheric tower tower top temperature sensor 55, and the bottom of atmospheric tower 19 is provided with atmospheric tower column bottom temperature sensor 56,

B, steam working line comprises Medium Pressure Steam Pipeline 27 and low-pressure steam pipeline 28, Medium Pressure Steam Pipeline 27 is connected with steam buffer tank 29 respectively with low-pressure steam pipeline 28, the steam (vapor) outlet 30 at steam buffer tank 29 top is connected with the shell side import of pre-rectifying tower reboiler 15 by pipeline, threeway is provided with between the shell side import of steam (vapor) outlet 30 and pre-rectifying tower reboiler 15, threeway first end is connected with steam (vapor) outlet 30, threeway second end is connected with the shell side import of pre-rectifying tower reboiler 15 by pipeline, threeway the 3rd end is connected with the shell side import of pressurizing tower reboiler 18 by pipeline, the shell-side outlet of pre-rectifying tower reboiler 15 is connected with condensate draining 31 respectively by pipeline with the shell-side outlet of pressurizing tower reboiler 18, middle pressure steam control valve 32 is provided with between described Medium Pressure Steam Pipeline 27 and steam buffer tank 29, middle pressure steam pressure sensor 33 and middle pressure steam temperature sensor 34, low-pressure steam control valve 35 is provided with, low-pressure steam pressure sensor 36 and low-pressure steam temperature sensor 37 between described low-pressure steam pipeline 28 and steam buffer tank 29, pipeline between described threeway second end and the shell side import of pre-rectifying tower reboiler 15 is provided with pre-rectifying tower tower bottom steam control valve 38, pipeline between threeway the 3rd end and the shell side import of pressurizing tower reboiler 18 is provided with pressurizing tower tower bottom steam control valve 40, described steam buffer tank 29 top is provided with steam buffer pressure tank sensor 41 and steam buffer tank temperature sensor 42,

C, Control System of Microcomputer comprises model predictive controller 57, model predictive controller 57 and DCS main controller 58, described DCS main controller 58 is connected with DCS database 39, described DCS database 39 respectively with steam buffer pressure tank sensor 41, pre-rectifying tower backflash liquid level gauge 52, pre-rectifying tower column bottom temperature sensor 50, liquid level gauge 51 at the bottom of pre-rectifying tower tower, atmospheric tower tower top temperature sensor 55, atmospheric tower column bottom temperature sensor 56, pressurizing tower tower top temperature sensor 53, pressurizing tower column bottom temperature sensor 54, pressurizing tower return flow meter 14, pressurizing tower extraction flowmeter 43, atmospheric tower return flow meter 47 and atmospheric tower extraction flowmeter 49, described DCS main controller 58 respectively with Liquid level adjusting valve 45 and pressurizing tower tower bottom steam control valve 40, atmospheric tower extraction flow control valve 48 and pressurizing tower extraction flow control valve 25 at the bottom of middle pressure steam control valve 32, pre-rectifying tower tower bottom steam control valve 38, thick alcohol charging control valve 2, atmospheric tower return valve 46, pressurizing tower tower.

The present invention is methanol fractionation system steam automatic voltage stabilization and control device and control method thereof, is now further described the present invention in conjunction with specific embodiments.Concrete embodiment is as follows:

Embodiment one

A, steam buffer pressure tank control method comprise the steps:

One, steam buffer pressure tank sensor 41 detects the pressure of steam buffer tank, and the pressure of steam buffer tank 29 is 0.28MPa, and now low-pressure steam control valve 35 is in full-gear, and the aperture of middle pressure steam control valve 32 is 40%;

One, pre-rectifying tower backflash liquid level gauge 52 detects the liquid level of pre-rectifying tower backflash 4, and the liquid level of pre-rectifying tower backflash 4 is 100mm, and now the aperture of pre-rectifying tower tower bottom steam control valve 38 is 19%;

One, pre-rectifying tower column bottom temperature sensor 50 detects the temperature at the bottom of pre-rectifying tower 3 tower, and the temperature at the bottom of pre-rectifying tower 3 tower is 74 DEG C, and now the aperture of pre-rectifying tower tower bottom steam control valve 38 is 19%;

One, at the bottom of pre-rectifying tower tower, liquid level gauge 51 detects the liquid level of pre-rectifying tower 3, and the liquid level of pre-rectifying tower 3 is 100mm, and now the aperture of thick alcohol charging control valve 2 is 58%;

E, atmospheric tower tower top temperature control method comprise the steps:

One, atmospheric tower tower top temperature sensor 55 detects the temperature of atmospheric tower 19 tower top, and the temperature of atmospheric tower 19 tower top is 67 DEG C, and now the aperture of atmospheric tower return valve 46 is 53%;

One, atmospheric tower column bottom temperature sensor 56 detects the temperature at the bottom of atmospheric tower 19 tower, and the temperature at the bottom of atmospheric tower 19 tower is 108 DEG C, and now at the bottom of pressurizing tower tower, the aperture of Liquid level adjusting valve 45 is 8%;

One, pressurizing tower tower top temperature sensor 53 detects the temperature of pressurizing tower 9 tower top, the temperature of pressurizing tower 9 tower top is 118 DEG C, pressurizing tower column bottom temperature sensor 54 detects the temperature at the bottom of pressurizing tower 9 tower, temperature at the bottom of pressurizing tower 9 tower is 126 DEG C, wherein, when the temperature at the bottom of pressurizing tower 9 tower reduces, the temperature of pressurizing tower 9 tower top is also along with reduction, when the temperature at the bottom of pressurizing tower 9 tower raises, the temperature of pressurizing tower 9 tower top is also along with rising, and now the aperture of pressurizing tower tower bottom steam control valve 40 is 46%;

The control method of h, atmospheric tower reflux ratio comprises the steps:

One, the return flow of atmospheric tower return flow meter 47 pairs of atmospheric towers 19 detects, the extraction flow of atmospheric tower extraction flowmeter 49 pairs of atmospheric towers 19 detects, the return flow of above-mentioned atmospheric tower 19 and the extraction flow-rate ratio of atmospheric tower 19 are 1.0, and the aperture of now atmospheric tower extraction flow control valve 48 is 13.5%;

The control method of i, pressurizing tower reflux ratio comprises the steps:

One, the return flow of pressurizing tower return flow meter 14 pairs of pressurizing tower 9 detects, the extraction flow of pressurizing tower extraction flowmeter 43 pairs of pressurizing tower 9 detects, the return flow of above-mentioned pressurizing tower 9 and the extraction flow-rate ratio of pressurizing tower 9 are 2.6, and the aperture of now atmospheric tower extraction flow control valve 48 is 34%;

Embodiment two

A, steam buffer pressure tank control method comprise the steps:

One, steam buffer pressure tank sensor 41 detects the pressure of steam buffer tank, and the pressure of steam buffer tank 29 is 0.30MPa, and now low-pressure steam control valve 35 is in full-gear, and the aperture of middle pressure steam control valve 32 is 40%;

One, pre-rectifying tower backflash liquid level gauge 52 detects the liquid level of pre-rectifying tower backflash 4, and the liquid level of pre-rectifying tower backflash 4 is 110mm, and now the aperture of pre-rectifying tower tower bottom steam control valve 38 is 19%;

One, pre-rectifying tower column bottom temperature sensor 50 detects the temperature at the bottom of pre-rectifying tower 3 tower, and the temperature at the bottom of pre-rectifying tower 3 tower is 74.5 DEG C, and now the aperture of pre-rectifying tower tower bottom steam control valve 38 is 19%;

One, at the bottom of pre-rectifying tower tower, liquid level gauge 51 detects the liquid level of pre-rectifying tower 3, and the liquid level of pre-rectifying tower 3 is 110mm, and now the aperture of thick alcohol charging control valve 2 is 58%;

E, atmospheric tower tower top temperature control method comprise the steps:

One, atmospheric tower tower top temperature sensor 55 detects the temperature of atmospheric tower 19 tower top, and the temperature of atmospheric tower 19 tower top is 68.5 DEG C, and now the aperture of atmospheric tower return valve 46 is 53%;

One, atmospheric tower column bottom temperature sensor 56 detects the temperature at the bottom of atmospheric tower 19 tower, and the temperature at the bottom of atmospheric tower 19 tower is 109 DEG C, and now at the bottom of pressurizing tower tower, the aperture of Liquid level adjusting valve 45 is 8%;

One, pressurizing tower tower top temperature sensor 53 detects the temperature of pressurizing tower 9 tower top, the temperature of pressurizing tower 9 tower top is 119.5 DEG C, pressurizing tower column bottom temperature sensor 54 detects the temperature at the bottom of pressurizing tower 9 tower, temperature at the bottom of pressurizing tower 9 tower is 128 DEG C, wherein, when the temperature at the bottom of pressurizing tower 9 tower reduces, the temperature of pressurizing tower 9 tower top is also along with reduction, when the temperature at the bottom of pressurizing tower 9 tower raises, the temperature of pressurizing tower 9 tower top is also along with rising, and now the aperture of pressurizing tower tower bottom steam control valve 40 is 46%;

The control method of h, atmospheric tower reflux ratio comprises the steps:

One, the return flow of atmospheric tower return flow meter 47 pairs of atmospheric towers 19 detects, the extraction flow of atmospheric tower extraction flowmeter 49 pairs of atmospheric towers 19 detects, the return flow of above-mentioned atmospheric tower 19 and the extraction flow-rate ratio of atmospheric tower 19 are 1.15, and the aperture of now atmospheric tower extraction flow control valve 48 is 13.5%;

The control method of i, pressurizing tower reflux ratio comprises the steps:

One, the return flow of pressurizing tower return flow meter 14 pairs of pressurizing tower 9 detects, the extraction flow of pressurizing tower extraction flowmeter 43 pairs of pressurizing tower 9 detects, the return flow of above-mentioned pressurizing tower 9 and the extraction flow-rate ratio of pressurizing tower 9 are 2.7, and the aperture of now atmospheric tower extraction flow control valve 48 is 34%;

Embodiment three

A, steam buffer pressure tank control method comprise the steps:

One, steam buffer pressure tank sensor 41 detects the pressure of steam buffer tank, and the normal pressure of steam buffer tank 29 is 0.3MPa, and now low-pressure steam control valve 35 is in full-gear, and the aperture of middle pressure steam control valve 32 is 40%;

One, pre-rectifying tower backflash liquid level gauge 52 detects the liquid level of pre-rectifying tower backflash 4, and the liquid level of pre-rectifying tower backflash 4 is 120mm, and now the aperture of pre-rectifying tower tower bottom steam control valve 38 is 19%;

One, pre-rectifying tower column bottom temperature sensor 50 detects the temperature at the bottom of pre-rectifying tower 3 tower, and the temperature at the bottom of pre-rectifying tower 3 tower is 75 DEG C, and now the aperture of pre-rectifying tower tower bottom steam control valve 38 is 19%;

One, at the bottom of pre-rectifying tower tower, liquid level gauge 51 detects the liquid level of pre-rectifying tower 3, and the liquid level of pre-rectifying tower 3 is 120mm, and now the aperture of thick alcohol charging control valve 2 is 58%;

E, atmospheric tower tower top temperature control method comprise the steps:

One, atmospheric tower tower top temperature sensor 55 detects the temperature of atmospheric tower 19 tower top, and the temperature of atmospheric tower 19 tower top is 70 DEG C, and now the aperture of atmospheric tower return valve 46 is 53%;

One, atmospheric tower column bottom temperature sensor 56 detects the temperature at the bottom of atmospheric tower 19 tower, and the temperature at the bottom of atmospheric tower 19 tower is 110 DEG C, and now at the bottom of pressurizing tower tower, the aperture of Liquid level adjusting valve 45 is 8%;

One, pressurizing tower tower top temperature sensor 53 detects the temperature of pressurizing tower 9 tower top, the temperature of pressurizing tower 9 tower top is 121 DEG C, pressurizing tower column bottom temperature sensor 54 detects the temperature at the bottom of pressurizing tower 9 tower, temperature at the bottom of pressurizing tower 9 tower is 130 DEG C, wherein, when the temperature at the bottom of pressurizing tower 9 tower reduces, the temperature of pressurizing tower 9 tower top is also along with reduction, when the temperature at the bottom of pressurizing tower 9 tower raises, the temperature of pressurizing tower 9 tower top is also along with rising, and now the aperture of pressurizing tower tower bottom steam control valve 40 is 46%;

The control method of h, atmospheric tower reflux ratio comprises the steps:

One, the return flow of atmospheric tower return flow meter 47 pairs of atmospheric towers 19 detects, the extraction flow of atmospheric tower extraction flowmeter 49 pairs of atmospheric towers 19 detects, the return flow of above-mentioned atmospheric tower 19 and the extraction flow-rate ratio of atmospheric tower 19 are 1.3, and the aperture of now atmospheric tower extraction flow control valve 48 is 13.5%;

The control method of i, pressurizing tower reflux ratio comprises the steps:

One, the return flow of pressurizing tower return flow meter 14 pairs of pressurizing tower 9 detects, the extraction flow of pressurizing tower extraction flowmeter 43 pairs of pressurizing tower 9 detects, the return flow of above-mentioned pressurizing tower 9 and the extraction flow-rate ratio of pressurizing tower 9 are 2.8, and the aperture of now atmospheric tower extraction flow control valve 48 is 34%;

Embodiment four

A, steam buffer pressure tank control method comprise the steps:

One, steam buffer pressure tank sensor 41 detects the pressure of steam buffer tank, and the normally-pressured neighbor of steam buffer tank 29 is between 0.28 ~ 0.32MPa, and now low-pressure steam control valve 35 is in full-gear, and the aperture of middle pressure steam control valve 32 is 40%;

Two, steam buffer pressure tank sensor 41 detects the pressure of steam buffer tank, when the pressure of steam buffer tank 29 is 0.27MPa, the pressure data of steam buffer tank 29 is fed back to DCS database 39 by steam buffer pressure tank sensor 41, and DCS database 39 passes through DCS main controller 58 by data feedback to model predictive controller 57;

Three, by feed back to model predictive controller 57 in step 2 data analysis after, model predictive controller 57 controls middle pressure steam control valve 32 by DCS main controller 58, be that 40% to adjust to aperture be 70% by middle pressure steam control valve 32 by aperture in step one, make the pressure increase of steam buffer tank 29 to 0.28MPa; When the pressure increase of steam buffer tank 29 is to 0.28MPa, model predictive controller 57 makes the aperture of middle pressure steam control valve 32 adjust to 40% by DCS main controller 58;

One, pre-rectifying tower backflash liquid level gauge 52 detects the liquid level of pre-rectifying tower backflash 4, and the liquid level normal range (NR) of pre-rectifying tower backflash 4 is between 100 ~ 120mm, and now the aperture of pre-rectifying tower tower bottom steam control valve 38 is 19%;

Two, pre-rectifying tower backflash liquid level gauge 52 detects the liquid level of pre-rectifying tower backflash 4, when the liquid level of pre-rectifying tower backflash 4 is 98mm, liquid level data in pre-rectifying tower backflash 4 is fed back to DCS database 39 by pre-rectifying tower backflash liquid level gauge 52, and DCS database 39 passes through DCS main controller 58 by data feedback to model predictive controller 57;

Three, by feed back to model predictive controller 57 in step 2 data analysis after, model predictive controller 57 controls pre-rectifying tower tower bottom steam control valve 38 by DCS main controller 58, be that 19% to adjust to aperture be 17% by pre-rectifying tower tower bottom steam control valve 38 by aperture in above-mentioned steps one, after making the liquid level of pre-rectifying tower backflash 4 rise to 100mm, model predictive controller 57 makes the aperture of pre-rectifying tower tower bottom steam control valve 38 adjust to 19% by DCS main controller 58;

One, pre-rectifying tower column bottom temperature sensor 50 detects the temperature at the bottom of pre-rectifying tower 3 tower, and the temperature normal range (NR) at the bottom of pre-rectifying tower 3 tower is between 74 ~ 75 DEG C, and now the aperture of pre-rectifying tower tower bottom steam control valve 38 is 19%;

Two, pre-rectifying tower column bottom temperature sensor 50 detects the temperature at the bottom of pre-rectifying tower 3 tower, when the temperature at the bottom of pre-rectifying tower 3 tower is 72 DEG C, temperature data at the bottom of pre-rectifying tower 3 tower is fed back to DCS database 39 by pre-rectifying tower column bottom temperature sensor 50, and DCS database 39 passes through DCS main controller 58 by data feedback to model predictive controller 57;

Three, by feed back to model predictive controller 57 in step 2 data analysis after, model predictive controller 57 controls pre-rectifying tower tower bottom steam control valve 38 by DCS main controller 58, be that 19% to adjust to aperture be 19.8% by pre-rectifying tower tower bottom steam control valve 38 by aperture in above-mentioned steps one, after making the temperature at the bottom of pre-rectifying tower 3 tower rise to 74 DEG C, model predictive controller 57 makes the aperture of pre-rectifying tower tower bottom steam control valve 38 adjust to 19% by DCS main controller 58;

One, at the bottom of pre-rectifying tower tower, liquid level gauge 51 detects the liquid level of pre-rectifying tower 3, and the liquid level normal range (NR) of pre-rectifying tower 3 is between 100 ~ 120mm, and now the aperture of thick alcohol charging control valve 2 is 58%;

Two, at the bottom of pre-rectifying tower tower, liquid level gauge 51 detects the liquid level of pre-rectifying tower 3, when the liquid level of pre-rectifying tower 3 is 93mm, at the bottom of pre-rectifying tower tower, the liquid level data in pre-rectifying tower 3 is fed back to DCS database 39 by liquid level gauge 51, and DCS database 39 passes through DCS main controller 58 by data feedback to model predictive controller 57;

Three, by feed back to model predictive controller 57 in step 2 data analysis after, model predictive controller 57 controls thick alcohol charging control valve 2 by DCS main controller 58, be that 58% to adjust to aperture be 67% by thick alcohol charging control valve 2 by aperture in above-mentioned steps one, after making the liquid level of pre-rectifying tower 3 rise to 100mm, model predictive controller 57 makes the aperture of thick alcohol charging control valve 2 adjust to 58% by DCS main controller 58;

E, atmospheric tower tower top temperature control method comprise the steps:

One, atmospheric tower tower top temperature sensor 55 detects the temperature of atmospheric tower 19 tower top, and the temperature normal range (NR) of atmospheric tower 19 tower top is between 67 ~ 70 DEG C, and now the aperture of atmospheric tower return valve 46 is 53%;

Two, atmospheric tower tower top temperature sensor 55 detects the temperature of atmospheric tower 19 tower top, when the temperature of atmospheric tower 19 tower top is 65 DEG C, the temperature data of atmospheric tower 19 tower top is fed back to DCS database 39 by atmospheric tower tower top temperature sensor 55, and DCS database 39 passes through DCS main controller 58 by data feedback to model predictive controller 57;

Three, by feed back to model predictive controller 57 in step 2 data analysis after, model predictive controller 57 controls atmospheric tower return valve 46 by DCS main controller 58, be that 53% to adjust to aperture be 50% by atmospheric tower return valve 46 by aperture in above-mentioned steps one, when making the temperature of atmospheric tower 19 tower top rise to 67 DEG C, model predictive controller 57 makes the aperture of atmospheric tower return valve 46 adjust to 53% by DCS main controller 58;

One, atmospheric tower column bottom temperature sensor 56 detects the temperature at the bottom of atmospheric tower 19 tower, and the temperature normal range (NR) at the bottom of atmospheric tower 19 tower is between 108 ~ 110 DEG C, and now at the bottom of pressurizing tower tower, the aperture of Liquid level adjusting valve 45 is 8%;

Two, atmospheric tower column bottom temperature sensor 56 detects the temperature at the bottom of atmospheric tower 19 tower, when the temperature at the bottom of atmospheric tower 19 tower is lower than 105 DEG C, temperature data at the bottom of atmospheric tower 19 tower is fed back to DCS database 39 by atmospheric tower column bottom temperature sensor 56, and DCS database 39 passes through DCS main controller 58 by data feedback to model predictive controller 57;

Three, by feed back to model predictive controller 57 in step 2 data analysis after, model predictive controller 57 controls Liquid level adjusting valve 45 at the bottom of pressurizing tower tower by DCS main controller 58, be that 8% to adjust to aperture be 2% by Liquid level adjusting valve 45 at the bottom of pressurizing tower tower by aperture in above-mentioned steps one, when making the temperature of atmospheric tower 19 tower top rise to 108 DEG C, model predictive controller 57 makes the aperture of Liquid level adjusting valve 45 at the bottom of pressurizing tower tower adjust to 8% by DCS main controller 58;

One, pressurizing tower tower top temperature sensor 53 detects the temperature of pressurizing tower 9 tower top, the temperature normal range (NR) of pressurizing tower 9 tower top is between 118 ~ 121 DEG C, pressurizing tower column bottom temperature sensor 54 detects the temperature at the bottom of pressurizing tower 9 tower, temperature normal range (NR) at the bottom of pressurizing tower 9 tower is between 126 ~ 130 DEG C, wherein, when the temperature at the bottom of pressurizing tower 9 tower reduces, the temperature of pressurizing tower 9 tower top is also along with reduction, when the temperature at the bottom of pressurizing tower 9 tower raises, the temperature of pressurizing tower 9 tower top is also along with rising, and now the aperture of pressurizing tower tower bottom steam control valve 40 is 46%;

Two, pressurizing tower tower top temperature sensor 53 detects the temperature of pressurizing tower 9 tower top, pressurizing tower column bottom temperature sensor 54 detects the temperature at the bottom of pressurizing tower 9 tower, when the temperature at the bottom of pressurizing tower 9 tower is 120 DEG C, temperature data at the bottom of pressurizing tower 9 tower is fed back to DCS database 39 by pressurizing tower column bottom temperature sensor 54, and DCS database 39 passes through DCS main controller 58 by data feedback to model predictive controller 57;

Three, by feed back to model predictive controller 57 in step 2 data analysis after, model predictive controller 57 controls pressurizing tower tower bottom steam control valve 40 by DCS main controller 58, be that 46% to adjust to aperture be 50% by pressurizing tower tower bottom steam control valve 40 by aperture in above-mentioned steps one, when making the temperature at the bottom of pressurizing tower 9 tower rise to 126 DEG C, model predictive controller 57 makes the aperture of pressurizing tower tower bottom steam control valve 40 adjust to 46% by DCS main controller 58;

The control method of h, atmospheric tower reflux ratio comprises the steps:

One, the return flow of atmospheric tower return flow meter 47 pairs of atmospheric towers 19 detects, the extraction flow of atmospheric tower extraction flowmeter 49 pairs of atmospheric towers 19 detects, the normal ratio of the return flow of above-mentioned atmospheric tower 19 and the extraction flow of atmospheric tower 19 is between 1.0 ~ 1.3, and the aperture of now atmospheric tower extraction flow control valve 48 is 13.5%;

Two, the return flow of atmospheric tower return flow meter 47 pairs of atmospheric towers 19 detects, the extraction flow of atmospheric tower extraction flowmeter 49 pairs of atmospheric towers 19 detects, when the return flow of atmospheric tower 19 is 0.9 with the ratio of the extraction flow of atmospheric tower 19, the return flow data of atmospheric tower return flow meter 47 pairs of atmospheric towers 19 and the extraction data on flows of atmospheric tower extraction flowmeter 49 pairs of atmospheric towers 19 feed back to DCS database 39 respectively, and DCS database 39 passes through DCS main controller 58 by data feedback to model predictive controller 57;

Three, by feed back to model predictive controller 57 in step 2 data analysis after, model predictive controller 57 controls atmospheric tower extraction flow control valve 48 by DCS main controller 58, be that 13.5% to adjust to aperture be 13% by atmospheric tower extraction flow control valve 48 by aperture in above-mentioned steps one, when the return flow of atmospheric tower 19 rises to 1.0 with the ratio of the extraction flow of atmospheric tower 19, model predictive controller 57 makes the aperture of atmospheric tower extraction flow control valve 48 adjust to 13.5% by DCS main controller 58;

The control method of i, pressurizing tower reflux ratio comprises the steps:

One, the return flow of pressurizing tower return flow meter 14 pairs of pressurizing tower 9 detects, the extraction flow of pressurizing tower extraction flowmeter 43 pairs of pressurizing tower 9 detects, the normal ratio of the return flow of above-mentioned pressurizing tower 9 and the extraction flow of pressurizing tower 9 is between 2.6 ~ 2.8, and the aperture of now atmospheric tower extraction flow control valve 48 is 34%;

Two, the return flow of pressurizing tower return flow meter 14 pairs of pressurizing tower 9 detects, the extraction flow of pressurizing tower extraction flowmeter 43 pairs of pressurizing tower 9 detects, when the return flow of pressurizing tower 9 is 2.3 with the ratio of the extraction flow of pressurizing tower 9, the return flow data of pressurizing tower return flow meter 14 pairs of pressurizing tower 9 and the extraction data on flows of pressurizing tower extraction flowmeter 43 pairs of pressurizing tower 9 feed back to DCS database 39 respectively, and DCS database 39 passes through DCS main controller 58 by data feedback to model predictive controller 57;

Three, by feed back to model predictive controller 57 in step 2 data analysis after, model predictive controller 57 controls pressurizing tower extraction flow control valve 25 by DCS main controller 58, be that 34% to adjust to aperture be 30% by pressurizing tower extraction flow control valve 25 by aperture in above-mentioned steps one, when the return flow of pressurizing tower 9 rises to 2.6 with the ratio of the extraction flow of pressurizing tower 9, model predictive controller 57 makes the aperture of pressurizing tower extraction flow control valve 25 adjust to 34% by DCS main controller 58;

Embodiment five

A, steam buffer pressure tank control method comprise the steps:

Two, steam buffer pressure tank sensor 41 detects the pressure of steam buffer tank, when the pressure of steam buffer tank 29 is 0.35MPa, the pressure data of steam buffer tank 29 is fed back to DCS database 39 by steam buffer pressure tank sensor 41, and DCS database 39 passes through DCS main controller 58 by data feedback to model predictive controller 57;

Three, by feed back to model predictive controller 57 in step 2 data analysis after, model predictive controller 57 controls middle pressure steam control valve 32 by DCS main controller 58, be that 40% to adjust to aperture be 20% by middle pressure steam control valve 32 by aperture in step one, make the pressure drop of steam buffer tank 29 to 0.32MPa; When the pressure drop of steam buffer tank 29 is to 0.32MPa, model predictive controller 57 makes the aperture of middle pressure steam control valve 32 adjust to 40% by DCS main controller 58;

Two, pre-rectifying tower backflash liquid level gauge 52 detects the liquid level of pre-rectifying tower backflash 4, when the liquid level of pre-rectifying tower backflash 4 is 130mm, liquid level data in pre-rectifying tower backflash 4 is fed back to DCS database 39 by pre-rectifying tower backflash liquid level gauge 52, and DCS database 39 passes through DCS main controller 58 by data feedback to model predictive controller 57;

Three, by feed back to model predictive controller 57 in step 2 data analysis after, model predictive controller 57 controls pre-rectifying tower tower bottom steam control valve 38 by DCS main controller 58, be that 19% to adjust to aperture be 23% by pre-rectifying tower tower bottom steam control valve 38 by aperture in above-mentioned steps one, after making the liquid level of pre-rectifying tower backflash 4 drop to 120mm, model predictive controller 57 makes the aperture of pre-rectifying tower tower bottom steam control valve 38 adjust to 19% by DCS main controller 58;

One, pre-rectifying tower column bottom temperature sensor 50 detects the temperature at the bottom of pre-rectifying tower 3 tower, and the temperature normal range (NR) at the bottom of pre-rectifying tower 3 tower is between 74 ~ 75 DEG C, and now the aperture of pre-rectifying tower tower bottom steam control valve 38 is 19%:

Two, pre-rectifying tower column bottom temperature sensor 50 detects the temperature at the bottom of pre-rectifying tower 3 tower, when the temperature at the bottom of pre-rectifying tower 3 tower is 79 DEG C, temperature data at the bottom of pre-rectifying tower 3 tower is fed back to DCS database 39 by pre-rectifying tower column bottom temperature sensor 50, and DCS database 39 passes through DCS main controller 58 by data feedback to model predictive controller 57;

Three, by feed back to model predictive controller 57 in step 2 data analysis after, model predictive controller 57 controls pre-rectifying tower tower bottom steam control valve 38 by DCS main controller 58, be that 19% to adjust to aperture be 18.5% by pre-rectifying tower tower bottom steam control valve 38 by aperture in above-mentioned steps one, after making the temperature at the bottom of pre-rectifying tower 3 tower drop to 75 DEG C, model predictive controller 57 makes the aperture of pre-rectifying tower tower bottom steam control valve 38 adjust to 19% by DCS main controller 58;

Two, at the bottom of pre-rectifying tower tower, liquid level gauge 51 detects the liquid level of pre-rectifying tower 3, when the liquid level of pre-rectifying tower 3 is 126mm, at the bottom of pre-rectifying tower tower, the liquid level data in pre-rectifying tower 3 is fed back to DCS database 39 by liquid level gauge 51, and DCS database 39 passes through DCS main controller 58 by data feedback to model predictive controller 57;

Three, by feed back to model predictive controller 57 in step 2 data analysis after, model predictive controller 57 controls thick alcohol charging control valve 2 by DCS main controller 58, be that 58% to adjust to aperture be 55% by thick alcohol charging control valve 2 by aperture in above-mentioned steps one, after making the liquid level of pre-rectifying tower backflash 4 drop to 120mm, model predictive controller 57 makes the aperture of thick alcohol charging control valve 2 adjust to 58% by DCS main controller 58;

E, atmospheric tower tower top temperature control method comprise the steps:

Two, atmospheric tower tower top temperature sensor 55 detects the temperature of atmospheric tower 19 tower top, when the temperature of atmospheric tower 19 tower top is 76 DEG C, the temperature data of atmospheric tower 19 tower top is fed back to DCS database 39 by atmospheric tower tower top temperature sensor 55, and DCS database 39 passes through DCS main controller 58 by data feedback to model predictive controller 57;

Three, by feed back to model predictive controller 57 in step 2 data analysis after, model predictive controller 57 controls atmospheric tower return valve 46 by DCS main controller 58, be that 53% to adjust to aperture be 55% by atmospheric tower return valve 46 by aperture in above-mentioned steps one, after making the temperature of atmospheric tower 19 tower top drop to 70 DEG C, model predictive controller 57 makes the aperture of atmospheric tower return valve 46 adjust to 53% by DCS main controller 58;

Two, atmospheric tower column bottom temperature sensor 56 detects the temperature at the bottom of atmospheric tower 19 tower, when the temperature at the bottom of atmospheric tower 19 tower is 118 DEG C, temperature data at the bottom of atmospheric tower 19 tower is fed back to DCS database 39 by atmospheric tower column bottom temperature sensor 56, and DCS database 39 passes through DCS main controller 58 by data feedback to model predictive controller 57;

Three, by feed back to model predictive controller 57 in step 2 data analysis after, model predictive controller 57 controls Liquid level adjusting valve 45 at the bottom of pressurizing tower tower by DCS main controller 58, be that 8% to adjust to aperture be 10% by Liquid level adjusting valve 45 at the bottom of pressurizing tower tower by aperture in above-mentioned steps one, after making the temperature at the bottom of atmospheric tower 19 tower drop to 110 DEG C, model predictive controller 57 makes the aperture of Liquid level adjusting valve 45 at the bottom of pressurizing tower tower adjust to 8% by DCS main controller 58;

Two, pressurizing tower tower top temperature sensor 53 detects the temperature of pressurizing tower 9 tower top, pressurizing tower column bottom temperature sensor 54 detects the temperature at the bottom of pressurizing tower 9 tower, when the temperature at the bottom of pressurizing tower tower is 133 DEG C, temperature data at the bottom of pressurizing tower 9 tower is fed back to DCS database 39 by pressurizing tower column bottom temperature sensor 54, and DCS database 39 passes through DCS main controller 58 by data feedback to model predictive controller 57;

Three, by feed back to model predictive controller 57 in step 2 data analysis after, model predictive controller 57 controls pressurizing tower tower bottom steam control valve 40 by DCS main controller 58, be that 46% to adjust to aperture be 40% by pressurizing tower tower bottom steam control valve 40 by aperture in above-mentioned steps one, after making the temperature at the bottom of pressurizing tower 9 tower drop to 130 DEG C, model predictive controller 57 makes the aperture of Liquid level adjusting valve 45 at the bottom of pressurizing tower tower adjust to 46% by DCS main controller 58;

The control method of h, atmospheric tower reflux ratio comprises the steps:

Two, the return flow of atmospheric tower return flow meter 47 pairs of atmospheric towers 19 detects, the extraction flow of atmospheric tower extraction flowmeter 49 pairs of atmospheric towers 19 detects, when the return flow of atmospheric tower 19 is 1.4 with the ratio of the extraction flow of atmospheric tower 19, the return flow data of atmospheric tower return flow meter 47 pairs of atmospheric towers 19 and the extraction data on flows of atmospheric tower extraction flowmeter 49 pairs of atmospheric towers 19 feed back to DCS database 39 respectively, and DCS database 39 passes through DCS main controller 58 by data feedback to model predictive controller 57;

Three, by feed back to model predictive controller 57 in step 2 data analysis after, model predictive controller 57 controls atmospheric tower extraction flow control valve 48 by DCS main controller 58, be that 13.5% to adjust to aperture be 14% by atmospheric tower extraction flow control valve 48 by aperture in above-mentioned steps one, when the return flow of atmospheric tower 19 drops to 1.3 with the ratio of the extraction flow of atmospheric tower 19, model predictive controller 57 makes the aperture of atmospheric tower extraction flow control valve 48 adjust to 13.5% by DCS main controller 58;

The control method of i, pressurizing tower reflux ratio comprises the steps:

Two, the return flow of pressurizing tower return flow meter 14 pairs of pressurizing tower 9 detects, the extraction flow of pressurizing tower extraction flowmeter 43 pairs of pressurizing tower 9 detects, when the return flow of pressurizing tower 9 is 3.0 with the ratio of the extraction flow of pressurizing tower 9, the return flow data of pressurizing tower return flow meter 14 pairs of pressurizing tower 9 and the extraction data on flows of pressurizing tower extraction flowmeter 43 pairs of pressurizing tower 9 feed back to DCS database 39 respectively, and DCS database 39 passes through DCS main controller 58 by data feedback to model predictive controller 57;

Three, by feed back to model predictive controller 57 in step 2 data analysis after, model predictive controller 57 controls pressurizing tower extraction flowmeter 43 by DCS main controller 58, be that 34% to adjust to aperture be 40% by pressurizing tower extraction flowmeter 43 by aperture in above-mentioned steps one, when the return flow of pressurizing tower 9 drops to 2.8 with the ratio of the extraction flow of pressurizing tower 9, model predictive controller 57 makes the aperture of pressurizing tower extraction flow control valve 25 adjust to 34% by DCS main controller 58.

Above-described embodiment is only for clearly example being described, and the restriction not to embodiment.For the common technique personnel in affiliated field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments, and thus the apparent change of amplifying out or variation be still among the protection domain of the invention claim.

Claims

1. a methanol fractionation system steam automatic voltage stabilization and control device, this control device comprises methanol rectification pipeline, steam working line and Control System of Microcomputer, it is characterized in that:

A, methanol rectification pipeline comprises crude carbinol pipeline (1), crude carbinol pipeline (1) is connected with the import on pre-rectifying tower (3) top by thick alcohol charging control valve (2), the gaseous phase outlet at pre-rectifying tower (3) top is connected with pre-rectifying tower backflash (4) by pipeline, pre-rectifying tower backflash (4) is connected with the pre-rectifying tower refluxing opening (6) on pre-rectifying tower (3) top by reflux pump (5), described pre-rectifying tower (3) bottom is provided with pre-rectifying tower first liquid-phase outlet (7) and pre-rectifying tower second liquid phase outlet (8), pre-rectifying tower first liquid-phase outlet (7) is connected with the import at pre-rectifying tower (3) middle part by the tube side of pre-rectifying tower reboiler (15), pre-rectifying tower second liquid phase outlet (8) is connected by the import of pipeline with pressurizing tower (9) middle part, the gaseous phase outlet at pressurizing tower (9) top is connected with the import of pressurizing tower backflash (11) by the shell side of atmospheric tower reboiler (10), pressurizing tower backflash (11) is provided with pressurizing tower backflash first and exports (12) and pressurizing tower backflash second exports (13), pressurizing tower backflash first is exported (12) and is connected with the pressurizing tower refluxing opening (21) on pressurizing tower top by pressurizing tower return flow meter (14), pressurizing tower backflash second is exported (13) and is connected with product storage tank (44) with pressurizing tower extraction flowmeter (43) by pressurizing tower extraction flow control valve (25), pressurizing tower (9) bottom is provided with pressurizing tower first liquid-phase outlet (16) and pressurizing tower second liquid phase outlet (17), pressurizing tower first liquid-phase outlet (16) is connected with the import of pressurizing tower (9) middle and lower part by the tube side of pressurizing tower reboiler (18), pressurizing tower second liquid phase outlet (17) is connected by the import of Liquid level adjusting valve (45) at the bottom of pressurizing tower tower with atmospheric tower (19) middle part, the gaseous phase outlet at atmospheric tower (19) top is connected by the import of pipeline with atmospheric tower backflash (20), atmospheric tower backflash (20) is provided with atmospheric tower backflash first outlet and atmospheric tower backflash second exports, atmospheric tower backflash first is exported and is connected with the atmospheric tower refluxing opening (22) on atmospheric tower (19) top with atmospheric tower return flow meter (47) by atmospheric tower return valve (46), atmospheric tower backflash second is exported and is connected with product storage tank (44) with atmospheric tower extraction flowmeter (49) by atmospheric tower extraction flow control valve (48), atmospheric tower (19) bottom is provided with atmospheric tower first liquid-phase outlet (23) and atmospheric tower second liquid phase outlet (24), atmospheric tower first liquid-phase outlet (23) is connected with the import of atmospheric tower (19) middle and lower part by the tube side of atmospheric tower reboiler (10), atmospheric tower second liquid phase outlet (24) is connected with thermoelectricity combustion pipe (26), the bottom of described pre-rectifying tower (3) is provided with pre-rectifying tower column bottom temperature sensor (50), the bottom of pre-rectifying tower (3) is provided with liquid level gauge (51) at the bottom of pre-rectifying tower tower, the bottom of described pre-rectifying tower backflash (4) is provided with pre-rectifying tower backflash liquid level gauge (52), the top of pressurizing tower (9) is provided with pressurizing tower tower top temperature sensor (53), the bottom of pressurizing tower (9) is provided with pressurizing tower column bottom temperature sensor (54), the top of atmospheric tower (19) is provided with atmospheric tower tower top temperature sensor (55), the bottom of atmospheric tower (19) is provided with atmospheric tower column bottom temperature sensor (56),

B, steam working line comprises Medium Pressure Steam Pipeline (27) and low-pressure steam pipeline (28), Medium Pressure Steam Pipeline (27) is connected with steam buffer tank (29) respectively with low-pressure steam pipeline (28), the steam (vapor) outlet (30) at steam buffer tank (29) top is connected by the shell side import of pipeline with pre-rectifying tower reboiler (15), threeway is provided with between the shell side import of steam (vapor) outlet (30) and pre-rectifying tower reboiler (15), threeway first end is connected with steam (vapor) outlet (30), threeway second end is connected by the shell side import of pipeline with pre-rectifying tower reboiler (15), threeway the 3rd end is connected by the shell side import of pipeline with pressurizing tower reboiler (18), the shell-side outlet of pre-rectifying tower reboiler (15) is connected with condensate draining (31) respectively by pipeline with the shell-side outlet of pressurizing tower reboiler (18), middle pressure steam control valve (32) is provided with between described Medium Pressure Steam Pipeline (27) and steam buffer tank (29), middle pressure steam pressure sensor (33) and middle pressure steam temperature sensor (34), low-pressure steam control valve (35) is provided with, low-pressure steam pressure sensor (36) and low-pressure steam temperature sensor (37) between described low-pressure steam pipeline (28) and steam buffer tank (29), pipeline between the shell side import of described threeway second end and pre-rectifying tower reboiler (15) is provided with pre-rectifying tower tower bottom steam control valve (38), pipeline between the shell side import of threeway the 3rd end and pressurizing tower reboiler (18) is provided with pressurizing tower tower bottom steam control valve (40), described steam buffer tank (29) top is provided with steam buffer pressure tank sensor (41) and steam buffer tank temperature sensor (42),

C, Control System of Microcomputer comprises model predictive controller (57), model predictive controller (57) is connected with DCS main controller (58), described DCS main controller (58) is connected with DCS database (39), described DCS database (39) respectively with steam buffer pressure tank sensor (41), pre-rectifying tower backflash liquid level gauge (52), pre-rectifying tower column bottom temperature sensor (50), liquid level gauge (51) at the bottom of pre-rectifying tower tower, atmospheric tower tower top temperature sensor (55), atmospheric tower column bottom temperature sensor (56), pressurizing tower tower top temperature sensor (53), pressurizing tower column bottom temperature sensor (54), pressurizing tower return flow meter (14), pressurizing tower extraction flowmeter (43), atmospheric tower return flow meter (47) is connected with atmospheric tower extraction flowmeter (49), described DCS main controller (58) respectively with Liquid level adjusting valve (45) and pressurizing tower tower bottom steam control valve (40) at the bottom of middle pressure steam control valve (32), pre-rectifying tower tower bottom steam control valve (38), thick alcohol charging control valve (2), atmospheric tower return valve (46), pressurizing tower tower, atmospheric tower extraction flow control valve (48) is connected with pressurizing tower extraction flow control valve (25).

2. the control method of methanol fractionation system steam automatic voltage stabilization and control device according to claim 1, it is characterized in that: this control method comprises the control method of steam buffer pressure tank, the control method of pre-rectifying tower return tank liquid level, the control method of pre-rectifying tower column bottom temperature, the control method of liquid level at the bottom of pre-rectifying tower tower, the control method of atmospheric tower tower top temperature, the control method of atmospheric tower column bottom temperature, the control method of pressurizing tower tower top temperature and pressurization column bottom temperature, the control method of atmospheric tower reflux ratio and the control method of pressurizing tower reflux ratio;

A, steam buffer pressure tank control method comprise the steps:

One, steam buffer pressure tank sensor (41) detects the pressure of steam buffer tank, the normally-pressured neighbor of steam buffer tank (29) is 0.28 ~ 0.32MPa, now low-pressure steam control valve (35) is in full-gear, and the aperture of middle pressure steam control valve (32) is 40%;

Two, steam buffer pressure tank sensor (41) detects the pressure of steam buffer tank, when the pressure of steam buffer tank (29) is lower than 0.28MPa, the pressure data of steam buffer tank (29) is fed back to DCS database (39) by steam buffer pressure tank sensor (41), DCS database (39) by DCS main controller (58) by data feedback to model predictive controller (57);

Three, by feed back to model predictive controller (57) in step 2 data analysis after, model predictive controller (57) controls middle pressure steam control valve (32) by DCS main controller (58), be that 40% to adjust to aperture be 70% by middle pressure steam control valve (32) by aperture in step one, make the pressure increase of steam buffer tank (29) to 0.28MPa; When the pressure increase of steam buffer tank (29) is to 0.28MPa, model predictive controller (57) makes the aperture of middle pressure steam control valve (32) adjust to 40% by DCS main controller (58);

Four, steam buffer pressure tank sensor (41) detects the pressure of steam buffer tank, when the pressure of steam buffer tank (29) is higher than 0.32MPa, the pressure data of steam buffer tank (29) is fed back to DCS database (39) by steam buffer pressure tank sensor (41), DCS database (39) by DCS main controller (58) by data feedback to model predictive controller (57);

Five, by feed back to model predictive controller (57) in step 4 data analysis after, model predictive controller (57) controls middle pressure steam control valve (32) by DCS main controller (58), be that 40% to adjust to aperture be 20% by middle pressure steam control valve (32) by aperture in step one, make the pressure drop of steam buffer tank (29) to 0.32MPa; When the pressure drop of steam buffer tank (29) is to 0.32MPa, model predictive controller (57) makes the aperture of middle pressure steam control valve (32) adjust to 40% by DCS main controller (58);

One, pre-rectifying tower backflash liquid level gauge (52) detects the liquid level of pre-rectifying tower backflash (4), the liquid level normal range (NR) of pre-rectifying tower backflash (4) is 100 ~ 120mm, and now the aperture of pre-rectifying tower tower bottom steam control valve (38) is 19%;

Two, pre-rectifying tower backflash liquid level gauge (52) detects the liquid level of pre-rectifying tower backflash (4), when the liquid level of pre-rectifying tower backflash (4) is lower than 100mm, liquid level data in pre-rectifying tower backflash (4) is fed back to DCS database (39) by pre-rectifying tower backflash liquid level gauge (52), DCS database (39) by DCS main controller (58) by data feedback to model predictive controller (57);

Three, by feed back to model predictive controller (57) in step 2 data analysis after, model predictive controller (57) controls pre-rectifying tower tower bottom steam control valve (38) by DCS main controller (58), be that 19% to adjust to aperture be 17% by pre-rectifying tower tower bottom steam control valve (38) by aperture in above-mentioned steps one, after making the liquid level of pre-rectifying tower backflash (4) rise to 100mm, model predictive controller (57) makes the aperture of pre-rectifying tower tower bottom steam control valve (38) adjust to 19% by DCS main controller (58),

Four, pre-rectifying tower backflash liquid level gauge (52) detects the liquid level of pre-rectifying tower backflash (4), when the liquid level of pre-rectifying tower backflash (4) is higher than 120mm, liquid level data in pre-rectifying tower backflash (4) is fed back to DCS database (39) by pre-rectifying tower backflash liquid level gauge (52), DCS database (39) by DCS main controller (58) by data feedback to model predictive controller (57);

Five, by feed back to model predictive controller (57) in step 4 data analysis after, model predictive controller (57) controls pre-rectifying tower tower bottom steam control valve (38) by DCS main controller (58), be that 19% to adjust to aperture be 23% by pre-rectifying tower tower bottom steam control valve (38) by aperture in above-mentioned steps one, after making the liquid level of pre-rectifying tower backflash (4) drop to 120mm, model predictive controller (57) makes the aperture of pre-rectifying tower tower bottom steam control valve (38) adjust to 19% by DCS main controller (58),

One, pre-rectifying tower column bottom temperature sensor (50) detects the temperature at the bottom of pre-rectifying tower (3) tower, temperature normal range (NR) at the bottom of pre-rectifying tower (3) tower is 74 ~ 75 DEG C, and now the aperture of pre-rectifying tower tower bottom steam control valve (38) is 19%;

Two, pre-rectifying tower column bottom temperature sensor (50) detects the temperature at the bottom of pre-rectifying tower (3) tower, when the temperature at the bottom of pre-rectifying tower (3) tower is lower than 74 DEG C, temperature data at the bottom of pre-rectifying tower (3) tower is fed back to DCS database (39) by pre-rectifying tower column bottom temperature sensor (50), DCS database (39) by DCS main controller (58) by data feedback to model predictive controller (57);

Three, by feed back to model predictive controller (57) in step 2 data analysis after, model predictive controller (57) controls pre-rectifying tower tower bottom steam control valve (38) by DCS main controller (58), be that 19% to adjust to aperture be 19.8% by pre-rectifying tower tower bottom steam control valve (38) by aperture in above-mentioned steps one, after making the temperature at the bottom of pre-rectifying tower (3) tower rise to 74 DEG C, model predictive controller (57) makes the aperture of pre-rectifying tower tower bottom steam control valve (38) adjust to 19% by DCS main controller (58),

Four, pre-rectifying tower column bottom temperature sensor (50) detects the temperature at the bottom of pre-rectifying tower (3) tower, when the temperature at the bottom of pre-rectifying tower (3) tower is higher than 75 DEG C, temperature data at the bottom of pre-rectifying tower (3) tower is fed back to DCS database (39) by pre-rectifying tower column bottom temperature sensor (50), DCS database (39) by DCS main controller (58) by data feedback to model predictive controller (57);

Five, by feed back to model predictive controller (57) in step 4 data analysis after, model predictive controller (57) controls pre-rectifying tower tower bottom steam control valve (38) by DCS main controller (58), be that 19% to adjust to aperture be 18.5% by pre-rectifying tower tower bottom steam control valve (38) by aperture in above-mentioned steps one, after making the temperature at the bottom of pre-rectifying tower (3) tower drop to 75 DEG C, model predictive controller (57) makes the aperture of pre-rectifying tower tower bottom steam control valve (38) adjust to 19% by DCS main controller (58),

One, liquid level gauge (51) at the bottom of pre-rectifying tower tower detects the liquid level of pre-rectifying tower (3), and the liquid level normal range (NR) of pre-rectifying tower (3) is 100 ~ 120mm, and now the aperture of thick alcohol charging control valve (2) is 58%;

Two, liquid level gauge (51) at the bottom of pre-rectifying tower tower detects the liquid level of pre-rectifying tower (3), when the liquid level of pre-rectifying tower (3) is lower than 100mm, at the bottom of pre-rectifying tower tower, the liquid level data in pre-rectifying tower (3) is fed back to DCS database (39) by liquid level gauge (51), DCS database (39) by DCS main controller (58) by data feedback to model predictive controller (57);

Three, by feed back to model predictive controller (57) in step 2 data analysis after, model predictive controller (57) controls thick alcohol charging control valve (2) by DCS main controller (58), be that 58% to adjust to aperture be 67% by thick alcohol charging control valve (2) by aperture in above-mentioned steps one, after making the liquid level of pre-rectifying tower (3) rise to 100mm, model predictive controller (57) makes the aperture of thick alcohol charging control valve (2) adjust to 58% by DCS main controller (58);

Four, liquid level gauge (51) at the bottom of pre-rectifying tower tower detects the liquid level of pre-rectifying tower (3), when the liquid level of pre-rectifying tower (3) is higher than 120mm, at the bottom of pre-rectifying tower tower, the liquid level data in pre-rectifying tower (3) is fed back to DCS database (39) by liquid level gauge (51), DCS database (39) by DCS main controller (58) by data feedback to model predictive controller (57);

Five, by feed back to model predictive controller (57) in step 4 data analysis after, model predictive controller (57) controls thick alcohol charging control valve (2) by DCS main controller (58), be that 58% to adjust to aperture be 55% by thick alcohol charging control valve (2) by aperture in above-mentioned steps one, after making the liquid level of pre-rectifying tower backflash (4) drop to 120mm, model predictive controller (57) makes the aperture of thick alcohol charging control valve (2) adjust to 58% by DCS main controller (58);

E, atmospheric tower tower top temperature control method comprise the steps:

One, atmospheric tower tower top temperature sensor (55) detects the temperature of atmospheric tower (19) tower top, the temperature normal range (NR) of atmospheric tower (19) tower top is 67 ~ 70 DEG C, and now the aperture of atmospheric tower return valve (46) is 53%;

Two, atmospheric tower tower top temperature sensor (55) detects the temperature of atmospheric tower (19) tower top, when the temperature of atmospheric tower (19) tower top is lower than 67 DEG C, the temperature data of atmospheric tower (19) tower top is fed back to DCS database (39) by atmospheric tower tower top temperature sensor (55), DCS database (39) by DCS main controller (58) by data feedback to model predictive controller (57);

Three, by feed back to model predictive controller (57) in step 2 data analysis after, model predictive controller (57) controls atmospheric tower return valve (46) by DCS main controller (58), be that 53% to adjust to aperture be 50% by atmospheric tower return valve (46) by aperture in above-mentioned steps one, when making the temperature of atmospheric tower (19) tower top rise to 67 DEG C, model predictive controller (57) makes the aperture of atmospheric tower return valve (46) adjust to 53% by DCS main controller (58);

Four, atmospheric tower tower top temperature sensor (55) detects the temperature of atmospheric tower (19) tower top, when the temperature of atmospheric tower (19) tower top is higher than 70 DEG C, the temperature data of atmospheric tower (19) tower top is fed back to DCS database (39) by atmospheric tower tower top temperature sensor (55), DCS database (39) by DCS main controller (58) by data feedback to model predictive controller (57);

Five, by feed back to model predictive controller (57) in step 4 data analysis after, model predictive controller (57) controls atmospheric tower return valve (46) by DCS main controller (58), be that 53% to adjust to aperture be 55% by atmospheric tower return valve (46) by aperture in above-mentioned steps one, after making the temperature of atmospheric tower (19) tower top drop to 70 DEG C, model predictive controller (57) makes the aperture of atmospheric tower return valve (46) adjust to 53% by DCS main controller (58);

One, atmospheric tower column bottom temperature sensor (56) detects the temperature at the bottom of atmospheric tower (19) tower, temperature normal range (NR) at the bottom of atmospheric tower (19) tower is 108 ~ 110 DEG C, and now at the bottom of pressurizing tower tower, the aperture of Liquid level adjusting valve (45) is 8%;

Two, atmospheric tower column bottom temperature sensor (56) detects the temperature at the bottom of atmospheric tower (19) tower, when the temperature at the bottom of atmospheric tower (19) tower is lower than 108 DEG C, temperature data at the bottom of atmospheric tower (19) tower is fed back to DCS database (39) by atmospheric tower column bottom temperature sensor (56), DCS database (39) by DCS main controller (58) by data feedback to model predictive controller (57);

Three, by feed back to model predictive controller (57) in step 2 data analysis after, model predictive controller (57) controls Liquid level adjusting valve (45) at the bottom of pressurizing tower tower by DCS main controller (58), be that 8% to adjust to aperture be 2% by Liquid level adjusting valve (45) at the bottom of pressurizing tower tower by aperture in above-mentioned steps one, when making the temperature of atmospheric tower (19) tower top rise to 108 DEG C, model predictive controller (57) makes the aperture of Liquid level adjusting valve (45) at the bottom of pressurizing tower tower adjust to 8% by DCS main controller (58);

Four, atmospheric tower column bottom temperature sensor (56) detects the temperature at the bottom of atmospheric tower (19) tower, when the temperature at the bottom of atmospheric tower (19) tower is higher than 110 DEG C, temperature data at the bottom of atmospheric tower (19) tower is fed back to DCS database (39) by atmospheric tower column bottom temperature sensor (56), DCS database (39) by DCS main controller (58) by data feedback to model predictive controller (57);

Five, by feed back to model predictive controller (57) in step 4 data analysis after, model predictive controller (57) controls Liquid level adjusting valve (45) at the bottom of pressurizing tower tower by DCS main controller (58), be that 8% to adjust to aperture be 10% by Liquid level adjusting valve (45) at the bottom of pressurizing tower tower by aperture in above-mentioned steps one, after making the temperature at the bottom of atmospheric tower (19) tower drop to 110 DEG C, model predictive controller (57) makes the aperture of Liquid level adjusting valve (45) at the bottom of pressurizing tower tower adjust to 8% by DCS main controller (58);

One, pressurizing tower tower top temperature sensor (53) detects the temperature of pressurizing tower (9) tower top, the temperature normal range (NR) of pressurizing tower (9) tower top is 118 ~ 121 DEG C, pressurizing tower column bottom temperature sensor (54) detects the temperature at the bottom of pressurizing tower (9) tower, temperature normal range (NR) at the bottom of pressurizing tower (9) tower is 126 ~ 130 DEG C, wherein, when the temperature at the bottom of pressurizing tower (9) tower reduces, the temperature of pressurizing tower (9) tower top is also along with reduction, when the temperature at the bottom of pressurizing tower (9) tower raises, the temperature of pressurizing tower (9) tower top is also along with rising, now the aperture of pressurizing tower tower bottom steam control valve (40) is 46%,

Two, pressurizing tower tower top temperature sensor (53) detects the temperature of pressurizing tower (9) tower top, pressurizing tower column bottom temperature sensor (54) detects the temperature at the bottom of pressurizing tower (9) tower, when the temperature at the bottom of pressurizing tower (9) tower is lower than 126 DEG C, temperature data at the bottom of pressurizing tower (9) tower is fed back to DCS database (39) by pressurizing tower column bottom temperature sensor (54), DCS database (39) by DCS main controller (58) by data feedback to model predictive controller (57);

Three, by feed back to model predictive controller (57) in step 2 data analysis after, model predictive controller (57) controls pressurizing tower tower bottom steam control valve (40) by DCS main controller (58), be that 46% to adjust to aperture be 50% by pressurizing tower tower bottom steam control valve (40) by aperture in above-mentioned steps one, when making the temperature at the bottom of pressurizing tower (9) tower rise to 126 DEG C, model predictive controller (57) makes the aperture of pressurizing tower tower bottom steam control valve (40) adjust to 46% by DCS main controller (58);

Four, pressurizing tower tower top temperature sensor (53) detects the temperature of pressurizing tower (9) tower top, pressurizing tower column bottom temperature sensor (54) detects the temperature at the bottom of pressurizing tower (9) tower, when the temperature at the bottom of pressurizing tower tower is higher than 130 DEG C, temperature data at the bottom of pressurizing tower (9) tower is fed back to DCS database (39) by pressurizing tower column bottom temperature sensor (54), DCS database (39) by DCS main controller (58) by data feedback to model predictive controller (57);

Five, by feed back to model predictive controller (57) in step 4 data analysis after, model predictive controller (57) controls pressurizing tower tower bottom steam control valve (40) by DCS main controller (58), be that 46% to adjust to aperture be 40% by pressurizing tower tower bottom steam control valve (40) by aperture in above-mentioned steps one, after making the temperature at the bottom of pressurizing tower (9) tower drop to 130 DEG C, model predictive controller (57) makes the aperture of Liquid level adjusting valve (45) at the bottom of pressurizing tower tower adjust to 46% by DCS main controller (58);

The control method of h, atmospheric tower reflux ratio comprises the steps:

One, the return flow of atmospheric tower return flow meter (47) to atmospheric tower (19) detects, the extraction flow of atmospheric tower extraction flowmeter (49) to atmospheric tower (19) detects, the normal ratio of the return flow of above-mentioned atmospheric tower (19) and the extraction flow of atmospheric tower (19) is 1.0 ~ 1.3, and the aperture of now atmospheric tower extraction flow control valve (48) is 13.5%;

Two, the return flow of atmospheric tower return flow meter (47) to atmospheric tower (19) detects, the extraction flow of atmospheric tower extraction flowmeter (49) to atmospheric tower (19) detects, the ratio of the return flow of atmospheric tower (19) and the extraction flow of atmospheric tower (19) lower than 1.0 time, to the return flow data of atmospheric tower (19) and atmospheric tower extraction flowmeter (49), the extraction data on flows to atmospheric tower (19) feeds back to DCS database (39) to atmospheric tower return flow meter (47) respectively, DCS database (39) by DCS main controller (58) by data feedback to model predictive controller (57),

Three, by feed back to model predictive controller (57) in step 2 data analysis after, model predictive controller (57) controls atmospheric tower extraction flow control valve (48) by DCS main controller (58), be that 13.5% to adjust to aperture be 13% by atmospheric tower extraction flow control valve (48) by aperture in above-mentioned steps one, when the ratio of the return flow of atmospheric tower (19) and the extraction flow of atmospheric tower (19) rises to 1.0, model predictive controller (57) makes the aperture of atmospheric tower extraction flow control valve (48) adjust to 13.5% by DCS main controller (58),

Four, the return flow of atmospheric tower return flow meter (47) to atmospheric tower (19) detects, the extraction flow of atmospheric tower extraction flowmeter (49) to atmospheric tower (19) detects, the ratio of the return flow of atmospheric tower (19) and the extraction flow of atmospheric tower (19) higher than 1.3 time, to the return flow data of atmospheric tower (19) and atmospheric tower extraction flowmeter (49), the extraction data on flows to atmospheric tower (19) feeds back to DCS database (39) to atmospheric tower return flow meter (47) respectively, DCS database (39) by DCS main controller (58) by data feedback to model predictive controller (57),

Five, by feed back to model predictive controller (57) in step 4 data analysis after, model predictive controller (57) controls atmospheric tower extraction flow control valve (48) by DCS main controller (58), be that 13.5% to adjust to aperture be 14% by atmospheric tower extraction flow control valve (48) by aperture in above-mentioned steps one, when the ratio of the return flow of atmospheric tower (19) and the extraction flow of atmospheric tower (19) drops to 1.3, model predictive controller (57) makes the aperture of atmospheric tower extraction flow control valve (48) adjust to 13.5% by DCS main controller (58),

The control method of i, pressurizing tower reflux ratio comprises the steps:

One, the return flow of pressurizing tower return flow meter (14) to pressurizing tower (9) detects, the extraction flow of pressurizing tower extraction flowmeter (43) to pressurizing tower (9) detects, the normal ratio of the return flow of above-mentioned pressurizing tower (9) and the extraction flow of pressurizing tower (9) is 2.6 ~ 2.8, and the aperture of now atmospheric tower extraction flow control valve (48) is 34%;

Two, the return flow of pressurizing tower return flow meter (14) to pressurizing tower (9) detects, the extraction flow of pressurizing tower extraction flowmeter (43) to pressurizing tower (9) detects, the ratio of the return flow of pressurizing tower (9) and the extraction flow of pressurizing tower (9) lower than 2.6 time, to the return flow data of pressurizing tower (9) and pressurizing tower extraction flowmeter (43), the extraction data on flows to pressurizing tower (9) feeds back to DCS database (39) to pressurizing tower return flow meter (14) respectively, DCS database (39) by DCS main controller (58) by data feedback to model predictive controller (57),

Three, by feed back to model predictive controller (57) in step 2 data analysis after, model predictive controller (57) controls pressurizing tower extraction flow control valve (25) by DCS main controller (58), be that 34% to adjust to aperture be 30% by pressurizing tower extraction flow control valve (25) by aperture in above-mentioned steps one, when the ratio of the return flow of pressurizing tower (9) and the extraction flow of pressurizing tower (9) rises to 2.6, model predictive controller (57) makes the aperture of pressurizing tower extraction flow control valve (25) adjust to 34% by DCS main controller (58),

Four, the return flow of pressurizing tower return flow meter (14) to pressurizing tower (9) detects, the extraction flow of pressurizing tower extraction flowmeter (43) to pressurizing tower (9) detects, the ratio of the return flow of pressurizing tower (9) and the extraction flow of pressurizing tower (9) higher than 2.8 time, to the return flow data of pressurizing tower (9) and pressurizing tower extraction flowmeter (43), the extraction data on flows to pressurizing tower (9) feeds back to DCS database (39) to pressurizing tower return flow meter (14) respectively, DCS database (39) by DCS main controller (58) by data feedback to model predictive controller (57),

Five, by feed back to model predictive controller (57) in step 4 data analysis after, model predictive controller (57) controls pressurizing tower extraction flowmeter (43) by DCS main controller (58), be that 34% to adjust to aperture be 40% by pressurizing tower extraction flowmeter (43) by aperture in above-mentioned steps one, when the ratio of the return flow of pressurizing tower (9) and the extraction flow of pressurizing tower (9) drops to 2.8, model predictive controller (57) makes the aperture of pressurizing tower extraction flow control valve (25) adjust to 34% by DCS main controller (58).