CN117605955A - Steam temperature and pressure reducing control system - Google Patents

Abstract

The utility model discloses a steam temperature and pressure reducing control system, which relates to the technical field of steam temperature and pressure reducing control, wherein the control system comprises three groups of pipeline loops of a low-pressure steam pipe, a medium-pressure steam pipe and a condensate return pipe; a low pressure attemperator inlet steam flow detector mounted outside the low pressure steam pipe; a low pressure desuperheating water regulating valve which is installed at the side of the low pressure pipeline pressure reducer, and the low pressure desuperheating water regulating valve is installed at the outside of the condensate return pipe; the medium pressure reducer inlet steam flow detector is arranged outside the medium pressure steam pipe, and a medium pressure reducer inlet steam pressure detector is correspondingly arranged below the medium pressure reducer inlet steam flow detector; and the outlet flow detector of the booster water pump is arranged outside the condensate return pipe. The steam temperature and pressure reduction control system adopts a novel structural design, so that the control system can realize the pressure and temperature implementation adjustment of a heat supply network, and the process is kept stable.

Description

Steam temperature and pressure reducing control system

Technical Field

The utility model relates to the technical field of steam temperature and pressure reduction control, in particular to a steam temperature and pressure reduction control system.

Background

Aiming at the requirements of the papermaking process, the pressure and temperature fluctuation of a heat supply network is solved, and the steam pressure and temperature fluctuation caused by external or discontinuous paper and the like is controlled by a control system, so that the pressure and the temperature are stabilized in the process setting range;

a steam heating, temperature and pressure reducing control system having application number CN217928983U, comprising: the device comprises a controller, a steam input port, a steam separation drum, a water tank, a temperature-reducing main pipe, a first temperature-reducing pressure-reducing control device, a second temperature-reducing pressure-reducing control device, a pressure regulating valve, a temperature testing component and a pressure testing component, wherein two parallel water supply pipes are arranged between a water outlet of the water tank and the temperature-reducing main pipe, a water return pipe is arranged between the temperature-reducing main pipe and the water tank, the pressure regulating valve is arranged on the water return pipe, a water supply pipe connected with the first temperature-reducing pressure-reducing control device and the second temperature-reducing pressure-reducing control device is arranged at the tail end of the temperature-reducing main pipe in parallel, steam outlets of the first temperature-reducing pressure-reducing control device and the second temperature-reducing pressure-reducing control device are respectively provided with steam outlet pipes, and shared steam collecting pipes are arranged at the tail ends of the two steam outlet pipes, and the temperature testing component and the pressure testing component are respectively arranged on the steam collecting pipes. By the mode, steam does not need to be stopped when the air conditioner fails, and the accuracy of steam output pressure and temperature is improved;

the utility model relates to an integrated interface controlled superheated steam temperature and pressure reducing device with the application number of CN205979183U, which mainly comprises four units, namely a main temperature reducing, temperature reducing and pressure reducing unit, a temperature reducing and pressure increasing control unit, a temperature reducing and pressure reducing recovery replenishing unit and a temperature reducing, temperature reducing and pressure reducing accurate control feedback unit.

In the existing partial papermaking DCS control system, a single loop is widely used for starting and stopping a motor of a low-voltage motor, in addition, an analog quantity control loop of a valve is commonly used for outputting a self-resetting function, and the motor is automatically stopped and the valve is closed under the condition that the control system fails or communication is interrupted, so that continuous supply of heat supply network steam to papermaking is not facilitated.

It is desirable to design a vapor pressure and temperature control system that addresses the above issues.

Disclosure of Invention

The utility model aims to provide a steam temperature and pressure reduction control system, which aims to solve the problems that the prior part of papermaking DCS control system is provided in the background technology, a single loop is widely used for starting and stopping a motor, in addition, the analog quantity control loop of a valve is commonly used for outputting a self-resetting function, the motor stops automatically and the valve is closed under the condition that the control system has a controller failure or communication is interrupted, the continuous supply of heat supply network steam to papermaking is not facilitated, and the like.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the control system comprises three groups of pipeline loops of a low-pressure steam pipe, a medium-pressure steam pipe and a condensate return pipe, wherein the side of the low-pressure steam pipe is communicated with the side of the condensate return pipe, and the side of the condensate return pipe is communicated with the side of the medium-pressure steam pipe;

a vapor attemperation and depressurization control system, comprising:

the low-pressure temperature and pressure reducer inlet steam flow detector is arranged outside the low-pressure steam pipe, a low-pressure temperature and pressure reducer steam inlet pressure detector is correspondingly arranged below the low-pressure temperature and pressure reducer inlet steam flow detector, a low-pressure temperature and pressure reducer inlet steam temperature detector is correspondingly arranged below the low-pressure temperature and pressure reducer steam inlet pressure detector, a low-pressure pipeline electric valve is further arranged outside the low-pressure steam pipe, a low-pressure pipeline pressure reducer is arranged at the joint of the low-pressure steam pipe and the condensate return pipe, a low-pressure reducer outlet pressure detector is correspondingly arranged below the low-pressure pipeline pressure reducer, a low-pressure reducer outlet steam temperature detector is correspondingly arranged below the low-pressure reducer outlet pressure detector, and low-pressure distribution cylinders are respectively arranged at two groups of outlets below the low-pressure steam pipe;

a low pressure desuperheating water regulating valve which is installed at the side of the low pressure pipeline pressure reducer, and the low pressure desuperheating water regulating valve is installed at the outside of the condensate return pipe;

a medium pressure reducer inlet steam flow detector which is arranged outside the medium pressure steam pipe, a medium pressure reducer inlet steam pressure detector is correspondingly arranged below the medium pressure reducer inlet steam flow detector, a medium pressure attemperator inlet steam temperature detector is correspondingly arranged below the medium pressure reducer inlet steam pressure detector, a medium pressure pipeline electric valve is arranged outside the medium pressure steam pipe, a medium pressure pipeline attemperator is arranged outside the junction of the medium pressure steam pipe and a condensate return pipe, a medium pressure pipeline attemperator is arranged outside the junction of the medium pressure pipeline attemperator, a medium pressure reducer outlet steam temperature detector is arranged on the side of the medium pressure pipeline attemperator, a medium pressure attemperator outlet steam temperature detector is arranged on the side of the medium pressure reducer outlet steam pressure detector, the medium pressure attemperator outlet steam temperature detector and the medium pressure attemperator outlet steam temperature detector are arranged outside the medium pressure steam pipe, a medium pressure attemperator outlet of the medium pressure steam pipe is connected with a medium pressure attemperator, and a medium pressure attemperator is arranged outside the condensate return pipe of the medium pressure attemperator;

the device comprises a booster pump outlet flow detector, a booster pump pressure detector, a hot water tank, a condensate tank liquid level detector, a desuperheater water A pump and a desuperheater water B pump, and a booster pump A pump and a booster pump B pump, wherein the booster pump outlet flow detector is arranged outside the condensate water return pipe, the booster pump outlet regulating valve is further arranged outside the condensate water return pipe, the booster pump pressure detector is correspondingly arranged below the booster pump outlet regulating valve, the hot water tank is arranged on the side of the condensate water return pipe, the condensate tank liquid level detector is arranged on the outer side of the hot water tank, the desuperheater water A pump and the desuperheater water B pump are arranged outside the condensate water return pipe on the left side of the hot water tank, and the booster pump A pump and the booster pump B pump are arranged outside the condensate water return pipe on the right side of the hot water tank.

Preferably, the low pressure temperature and pressure reducer steam inlet pressure detector, the low pressure temperature and pressure reducer inlet steam temperature detector, the low pressure pipeline electric valve, the low pressure pipeline pressure reducer, the low pressure reducer outlet pressure detector, the low pressure attemperator outlet steam temperature detector and the low pressure attemperator are formed into a low pressure control system;

the temperature and pressure compensation calculation formula of the steam inlet pressure detector of the low-pressure temperature and pressure reducer and the steam inlet steam temperature detector of the low-pressure temperature and pressure reducer participating in the steam flow is as follows

The low-pressure pipeline electric valve is used for isolating or communicating an external heat supply pipeline;

the low-pressure pipeline pressure reducer and the low-pressure reducer outlet pressure detector perform closed-loop PID control pressure;

and the low-pressure attemperator outlet steam temperature detector and the low-pressure attemperation water regulating valve form a low-pressure control system to carry out closed-loop PID control on temperature.

Preferably, the medium pressure control system is composed of a medium pressure reducer inlet steam pressure detector, a medium pressure desuperheater inlet steam temperature detector, a medium pressure pipeline electric valve, a medium pressure pipeline reducer, a medium pressure reducer outlet pressure detector, a medium pressure desuperheater outlet steam temperature detector and a medium pressure desuperheater regulating valve;

the temperature and pressure compensation calculation formula of the steam flow participated by the medium pressure reducer inlet steam pressure detector and the medium pressure desuperheater inlet steam temperature detector is as follows

The medium-pressure pipeline electric valve is used for isolating or communicating an external heat supply pipeline;

the medium-pressure pipeline pressure reducer and the medium-pressure reducer outlet pressure detector perform closed-loop PID control pressure;

and the medium-pressure desuperheater outlet steam temperature detector and the medium-pressure desuperheater regulating valve perform closed-loop PID control on temperature.

Preferably, the desuperheating water A pump and the desuperheating water B pump are interlocked with a condensed water tank liquid level detector of the hot water tank, and the desuperheating water A pump and the desuperheating water B pump are controlled to stop when the condensed water tank liquid level detector detects low liquid level alarm.

Preferably, the booster A pump and the booster B pump are interlocked with a condensate tank liquid level detector of the hot water tank, the booster A pump and the booster B pump are controlled to be started when the condensate tank liquid level detector detects high liquid level alarm, and the booster A pump and the booster B pump are controlled to be stopped when the condensate tank liquid level detector detects low liquid level alarm.

Preferably, the outlet regulating valve of the booster pump, the pressure detector of the booster pump and the liquid level detector of the condensate tank are subjected to closed-loop PID control, and the booster A pump and the booster B pump are controlled to be started when the outlet pressure of the pressure detector of the booster pump is lower than 1000 Kpa.

Preferably, the desuperheating water A pump, the desuperheating water B pump, the pressurizing A pump and the pressurizing B pump display current signals high alarm/high alarm, and alarm values can be set.

Preferably, the low-pressure pipeline electric valve, the low-pressure temperature-reducing water regulating valve, the medium-pressure pipeline pressure reducer and the medium-pressure temperature-reducing water regulating valve are all regulating valves controlled by 4-20mA analog quantity signals, the system adopts a function of outputting and maintaining a final output value by module communication faults, and the valves maintain a final output opening.

Preferably, the signals of the low-pressure pipeline electric valve and the medium-pressure pipeline electric valve which participate in control are a ready signal, a forward signal, a reverse signal, a start-stop signal, an on-position signal, an off-position signal and a position indication signal;

when the preparation signal is normal, the valve motor can be manually controlled to rotate forward and reversely through a picture to realize the valve switch;

the valve opening and closing action can be switched to be manual/automatic, the position signal can be preset through a picture, and when the valve is automatically opened or closed, the position indication reaches a set value, and the valve motor stops rotating forwards or reversely;

the picture can set the overtime alarm time of the valve switch, and when the valve is opened or closed to reach the alarm time, the valve motor stops rotating forward and backward.

Compared with the prior art, the utility model has the beneficial effects that:

the steam temperature and pressure reduction control system adopts a novel structural design, so that the control system can realize the pressure and temperature implementation adjustment of a heat supply network by designing an electric valve switch control program and an electric valve PID closed-loop control program, and is stabilized in a process set value range, thereby achieving the effect of stabilizing a process; and the analog output address of the opening of the electric valve is configured to be a final output value of the communication fault, so that the influence of the network interruption of the control system on the temperature and pressure reduction system is avoided, and the heat supply of papermaking steam is further ensured.

Drawings

FIG. 1 is a schematic diagram of the system workflow of the present utility model;

FIG. 2 is a schematic diagram of the inlet temperature measurement of the attemperator for low pressure steam according to the present utility model;

FIG. 3 is a schematic diagram of the outlet temperature measurement of the attemperator for low pressure steam according to the present utility model;

FIG. 4 is a schematic diagram of the opening measurement of the low pressure steam reducer of the present utility model;

FIG. 5 is a schematic diagram of the inlet pressure measurement of the attemperator for low pressure steam according to the present utility model;

FIG. 6 is a schematic view of the measured value of the outlet of the attemperator of the low-pressure steam of the present utility model;

FIG. 7 is a schematic diagram of the opening measurement of the low pressure steam attemperation valve of the present utility model;

FIG. 8 is a schematic diagram of the PID control of the low pressure steam attemperation valve of the present utility model, controlling outlet temperature;

FIG. 9 is a schematic diagram of the PID control, control outlet pressure of the low pressure steam reducer of the present utility model;

FIG. 10 is a schematic diagram of inlet temperature measurements of a pressure reducer for medium pressure steam in accordance with the present utility model;

FIG. 11 is a schematic diagram of the measured outlet temperature of the pressure reducer for medium pressure steam in accordance with the present utility model;

FIG. 12 is a schematic diagram of the opening measurement of a medium pressure steam reducer according to the present utility model;

FIG. 13 is a schematic diagram of the inlet pressure measurement of a pressure reducer for medium pressure steam in accordance with the present utility model;

FIG. 14 is a schematic diagram of the measured outlet pressure of the pressure reducer for medium pressure steam in accordance with the present utility model;

FIG. 15 is a schematic diagram of a measurement of the opening of a medium pressure steam attemperation valve according to the present utility model;

FIG. 16 is a schematic diagram of the PID control of the medium pressure steam attemperation valve, control outlet temperature according to the present utility model;

FIG. 17 is a schematic diagram of the PID control, control outlet pressure of the medium pressure steam reducer of the present utility model;

FIG. 18 is a graph showing the measurement of the opening degree of the backwater pressure of condensate water according to the present utility model;

FIG. 19 is a schematic view of the water tank level opening measurement of the present utility model;

FIG. 20 is a schematic diagram of a water return valve opening measurement in accordance with the present utility model;

FIG. 21 is a schematic diagram of the PID control of the condensate return electric valve, controlling the tank level according to the present utility model;

FIG. 22 is a schematic diagram of a low pressure steam flow measurement in accordance with the present utility model;

FIG. 23 is a schematic diagram of a medium pressure steam flow measurement in accordance with the present utility model;

FIG. 24 is a schematic view of a condensate flow measurement according to the present utility model;

FIG. 25 is a schematic address diagram of a control loop of a low pressure electrically operated valve according to the present utility model;

FIG. 26 is a schematic diagram of a switching control program of the low-pressure electric valve according to the present utility model;

FIG. 27 is a schematic view of the automatic opening setting position of the low pressure electric valve of the present utility model;

FIG. 28 is a schematic diagram of a medium pressure electrically operated valve control I/O address in accordance with the present utility model;

FIG. 29 is a schematic diagram of the switching control of the medium pressure electrically operated valve of the present utility model;

FIG. 30 is a schematic view of an automatic opening setting position of a medium pressure electric valve according to the present utility model;

FIG. 31 is a schematic control diagram of the desuperheating water A pump 21 of the present utility model;

FIG. 32 is a schematic diagram of the control of the desuperheating water B pump 22 of the present utility model;

FIG. 33 is a schematic diagram of the control of the pressurized water A pump 23 of the present utility model;

FIG. 34 is a schematic diagram of the control of the pressurized water B pump 24 of the present utility model;

FIG. 35 is a schematic view of the current measurement of the desuperheating water A pump 21 of the present utility model;

FIG. 36 is a schematic view of the current measurement of the desuperheating water B pump 22 of the present utility model;

FIG. 37 is a schematic diagram of the current measurement of the pressurized water A pump 23 of the present utility model;

FIG. 38 is a schematic diagram of the current measurement of the pressurized water B pump 24 of the present utility model;

FIG. 39 is a schematic diagram of a communication failure configuration of the present utility model.

In the figure: 01. a low pressure steam pipe; 02. a medium pressure steam pipe; 03. a condensate return pipe; 1. an inlet steam flow detector of the low-pressure temperature-reducing pressure reducer; 2. a low pressure attemperator steam inlet pressure detector; 3. a low-pressure temperature-reducing pressure reducer inlet steam temperature detector; 4. a low pressure pipeline electric valve; 5. a low pressure pipeline reducer; 6. a low pressure reducer outlet pressure detector; 7. a low pressure attemperator outlet steam temperature detector; 8. a low pressure desuperheating water regulating valve; 9. an inlet steam flow detector of the medium-pressure reducer; 10. a medium pressure reducer inlet steam pressure detector; 11. an inlet steam temperature detector of the medium-pressure desuperheater; 12. a medium pressure pipeline electric valve; 13. a medium pressure pipeline pressure reducer; 14. an outlet pressure detector of the medium pressure reducer; 15. a medium pressure desuperheater outlet steam temperature detector; 16. a medium pressure desuperheater regulating valve; 17. a booster pump outlet flow detector; 18. an outlet regulating valve of the booster water pump; 19. a booster pump pressure detector; 20. a hot water tank; 201. a condensate tank level detector; 21. a desuperheating water A pump; 22. a desuperheating water B pump; 23. a booster pump A; 24. a booster B pump; 25. a low-pressure split cylinder; 26. and a medium-pressure split cylinder.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-39, the present utility model provides a technical solution: the control system comprises three groups of pipeline loops of a low-pressure steam pipe 01, a medium-pressure steam pipe 02 and a condensate return pipe 03, wherein the side of the low-pressure steam pipe 01 is communicated with the side of the condensate return pipe 03, and the side of the condensate return pipe 03 is communicated with the side of the medium-pressure steam pipe 02;

a vapor attemperation and depressurization control system, comprising:

a low-pressure attemperator inlet steam flow detector 1 which is arranged outside the low-pressure steam pipe 01, wherein a low-pressure attemperator steam inlet pressure detector 2 is correspondingly arranged below the low-pressure attemperator inlet steam flow detector 1, a low-pressure attemperator inlet steam temperature detector 3 is correspondingly arranged below the low-pressure attemperator steam inlet pressure detector 2, a low-pressure pipeline electric valve 4 is also arranged outside the low-pressure steam pipe 01, a low-pressure pipeline pressure reducer 5 is arranged at the joint of the low-pressure steam pipe 01 and the condensate return pipe 03, a low-pressure attemperator outlet pressure detector 6 is correspondingly arranged below the low-pressure pipeline pressure reducer 5, a low-pressure attemperator outlet steam temperature detector 7 is correspondingly arranged below the low-pressure attemperator outlet pressure detector 6, and a low-pressure distribution cylinder 25 is arranged at both groups of outlets below the low-pressure steam pipe 01;

a low-pressure desuperheating water regulating valve 8 installed at the side of the low-pressure pipe reducer 5, and the low-pressure desuperheating water regulating valve 8 is installed at the outside of the condensate return pipe 03;

a medium pressure reducer inlet steam flow detector 9 which is installed outside the medium pressure steam pipe 02, and a medium pressure reducer inlet steam pressure detector 10 is correspondingly installed below the medium pressure reducer inlet steam flow detector 9, and a medium pressure attemperator inlet steam temperature detector 11 is correspondingly installed below the medium pressure reducer inlet steam pressure detector 10, a medium pressure pipe electric valve 12 is installed outside the medium pressure steam pipe 02, and a medium pressure pipe pressure reducer 13 is installed outside the junction of the medium pressure steam pipe 02 and the condensate return pipe 03, a medium pressure attemperator outlet pressure detector 14 is installed on the side of the medium pressure pipe pressure reducer 13, a medium pressure attemperator outlet steam temperature detector 15 is installed on the side of the medium pressure attemperator outlet pressure detector 14, and the medium pressure attemperator outlet steam temperature detector 14 and the medium pressure attemperator outlet steam temperature detector 15 are installed outside the medium pressure steam pipe 02, while a medium pressure attemperator cylinder 26 is connected to the pipe outlet of the medium pressure attemperator 02, a medium pressure attemperator 16 is also installed on the side of the medium pressure attemperator 13, and a medium pressure attemperator 16 is installed on the side of the condensate return pipe 03;

the booster pump outlet flow detector 17 is installed outside the condensate return pipe 03, the booster pump outlet regulating valve 18 is also installed outside the condensate return pipe 03, the booster pump pressure detector 19 is correspondingly installed below the booster pump outlet regulating valve 18, the hot water tank 20 is installed on the side of the condensate return pipe 03, the condensate tank liquid level detector 201 is installed on the outer side of the hot water tank 20, the desuperheater water A pump 21 and the desuperheater water B pump 22 are installed outside the condensate return pipe 03 on the left side of the hot water tank 20, and the booster A pump 23 and the booster B pump 24 are installed outside the condensate return pipe 03 on the right side of the hot water tank 20.

In the embodiment, a low pressure control system is formed by a low pressure temperature and pressure reducer steam inlet pressure detector 2, a low pressure temperature and pressure reducer inlet steam temperature detector 3, a low pressure pipeline electric valve 4, a low pressure pipeline pressure reducer 5, a low pressure reducer outlet pressure detector 6, a low pressure temperature and pressure reducer outlet steam temperature detector 7 and a low pressure temperature and pressure reducer regulating valve 8;

the temperature and pressure compensation calculation formula of the steam flow of the low-pressure temperature and pressure reducer steam inlet pressure detector 2 and the low-pressure temperature and pressure reducer inlet steam temperature detector 3 is as follows

The low-pressure pipeline electric valve 4 is used for isolating or communicating an external heat supply pipeline;

the low-pressure pipeline pressure reducer 5 and the low-pressure reducer outlet pressure detector 6 perform closed-loop PID control pressure;

the low-pressure attemperator outlet steam temperature detector 7 and the low-pressure attemperation water regulating valve 8 form a low-pressure control system to carry out closed-loop PID control temperature;

the medium pressure control system is composed of a medium pressure reducer inlet steam pressure detector 10, a medium pressure desuperheater inlet steam temperature detector 11, a medium pressure pipeline electric valve 12, a medium pressure pipeline reducer 13, a medium pressure reducer outlet pressure detector 14, a medium pressure desuperheater outlet steam temperature detector 15 and a medium pressure desuperheater regulating valve 16;

the temperature and pressure compensation calculation formula of the steam flow of the medium-pressure reducer inlet steam pressure detector 10 and the medium-pressure desuperheater inlet steam temperature detector 11 is as follows

The medium-pressure pipeline electric valve 12 is used for isolating or communicating an external heat supply pipeline;

the medium pressure pipeline pressure reducer 13 and the medium pressure reducer outlet pressure detector 14 perform closed-loop PID control pressure;

the steam temperature detector 15 at the outlet of the medium-pressure desuperheater and the desuperheater temperature water regulating valve 16 perform closed-loop PID control temperature;

the desuperheating water A pump 21 and the desuperheating water B pump 22 are interlocked with the condensed water tank liquid level detector 201 of the hot water tank 20, and the desuperheating water A pump 21 and the desuperheating water B pump 22 are controlled to stop when the condensed water tank liquid level detector 201 detects low liquid level alarm;

the booster A pump 23 and the booster B pump 24 are interlocked with the condensate tank liquid level detector 201 of the hot water tank 20, the booster A pump 23 and the booster B pump 24 are controlled to be started when the condensate tank liquid level detector 201 detects a high liquid level alarm, and the booster A pump 23 and the booster B pump 24 are controlled to be stopped when the condensate tank liquid level detector 201 detects a low liquid level alarm;

the booster pump outlet regulating valve 18, the booster pump pressure detector 19 and the condensate tank liquid level detector 201 are subjected to closed-loop PID control, and when the outlet pressure of the booster pump pressure detector 19 is lower than 1000Kpa, the booster A pump 23 and the booster B pump 24 are controlled to be started;

the desuperheating water a pump 21, the desuperheating water B pump 22, the pressurizing a pump 23 and the pressurizing B pump 24 display a current signal high alarm/high alarm, and an alarm value can be set;

the low-pressure pipeline electric valve 4, the low-pressure temperature-reducing water regulating valve 8, the medium-pressure pipeline pressure reducer 13 and the medium-pressure temperature-reducing water regulating valve 16 are all regulating valves controlled by 4-20mA analog quantity signals, the system adopts a module communication fault output function to keep a final output value, and the valves keep a final output opening;

the signals of the low-pressure pipeline electric valve 4 and the medium-pressure pipeline electric valve 12 which participate in control are a ready signal, a forward signal, a reverse signal, a start-stop signal, an on-position signal, an off-position signal and a position indication signal;

when the preparation signal is normal, the valve motor can be manually controlled to rotate forward and reversely through a picture to realize the valve switch;

the valve opening and closing action can be switched to be manual/automatic, the position signal can be preset through a picture, and when the valve is automatically opened or closed, the position indication reaches a set value, and the valve motor stops rotating forwards or reversely;

the picture can set the overtime alarm time of the valve switch, and when the valve is opened or closed to reach the alarm time, the valve motor stops rotating forward and backward.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (9)

1. The control system comprises three groups of pipeline loops of a low-pressure steam pipe (01), a medium-pressure steam pipe (02) and a condensate return pipe (03), wherein the side of the low-pressure steam pipe (01) is communicated with the side of the condensate return pipe (03), and the side of the condensate return pipe (03) is communicated with the side of the medium-pressure steam pipe (02);

characterized by comprising the following steps:

a low-pressure attemperator inlet steam flow detector (1) which is arranged outside the low-pressure steam pipe (01), wherein the lower part of the low-pressure attemperator inlet steam flow detector (1) is correspondingly provided with a low-pressure attemperator steam inlet pressure detector (2), the lower part of the low-pressure attemperator steam inlet pressure detector (2) is correspondingly provided with a low-pressure attemperator inlet steam temperature detector (3), the outside of the low-pressure steam pipe (01) is also provided with a low-pressure pipeline electric valve (4), the joint of the low-pressure steam pipe (01) and a condensate return pipe (03) is provided with a low-pressure pipeline attemperator (5), the lower part of the low-pressure pipeline attemperator (5) is correspondingly provided with a low-pressure attemperator outlet steam temperature detector (7), and the lower part of the low-pressure attemperator outlet steam pipe (01) is provided with a low-pressure distribution cylinder (25);

a low-pressure temperature-reducing water regulating valve (8) which is arranged at the side of the low-pressure pipeline pressure reducer (5), and the low-pressure temperature-reducing water regulating valve (8) is arranged outside the condensate return pipe (03);

a medium pressure reducer inlet steam flow detector (9) which is installed outside the medium pressure steam pipe (02), and a medium pressure reducer inlet steam flow detector (10) is correspondingly installed below the medium pressure reducer inlet steam flow detector (9), and a medium pressure reducer inlet steam temperature detector (11) is correspondingly installed below the medium pressure reducer inlet steam pressure detector (10), a medium pressure pipe electric valve (12) is installed outside the medium pressure steam pipe (02), and a medium pressure pipe reducer (13) is installed outside the junction of the medium pressure steam pipe (02) and a condensate return pipe (03), a medium pressure pipe outlet pressure detector (14) is installed on the side of the medium pressure pipe reducer (13), and a medium pressure reducer outlet steam temperature detector (15) is installed on the side of the medium pressure reducer outlet pressure detector (14), and the medium pressure reducer outlet pressure detector (14) and the medium pressure reducer outlet steam temperature detector (15) are installed outside the medium pressure steam pipe (02), and a medium pressure pipe pressure reducer outlet (16) is installed on the side of the condensate return pipe (03), and a medium pressure reducer outlet pressure pipe (16) is installed on the side of the condensate return pipe (03;

the utility model provides a condensate water pump outlet flow detector (17), its installs the outside of condensate water wet return (03), and the outside of condensate water wet return (03) still installs booster pump outlet control valve (18) to booster pump outlet control valve (18) below corresponds installs booster pump pressure detector (19), hot-water tank (20) are installed to the avris of condensate water wet return (03), and condensate water tank liquid level detector (201) are installed to the avris of hot-water tank (20), condensate water wet return (03) external mounting on hot-water tank (20) left side has desuperheating water A pump (21) and desuperheating water B pump (22), and condensate water wet return (03) external mounting on hot-water tank (20) right side has booster A pump (23) and booster B pump (24).

2. The vapor pressure and temperature reduction control system of claim 1, wherein: the low-pressure temperature and pressure reducer steam inlet pressure detector (2), the low-pressure temperature and pressure reducer inlet steam temperature detector (3), the low-pressure pipeline electric valve (4), the low-pressure pipeline pressure reducer (5), the low-pressure reducer outlet pressure detector (6), the low-pressure attemperator outlet steam temperature detector (7) and the low-pressure attemperator regulating valve (8) form a low-pressure control system;

the temperature and pressure compensation calculation formula of the steam flow is that a low-pressure temperature and pressure reducer steam inlet pressure detector (2) and a low-pressure temperature and pressure reducer inlet steam temperature detector (3) participate in the steam flow

The low-pressure pipeline electric valve (4) is used for isolating or communicating an external heat supply pipeline;

the low-pressure pipeline pressure reducer (5) and the low-pressure reducer outlet pressure detector (6) perform closed-loop PID control pressure;

the low-pressure attemperator outlet steam temperature detector (7) and the low-pressure attemperation water regulating valve (8) form a low-pressure control system to carry out closed-loop PID control temperature.

3. The vapor pressure and temperature reduction control system of claim 1, wherein: the medium pressure control system is composed of a medium pressure reducer inlet steam pressure detector (10), a medium pressure desuperheater inlet steam temperature detector (11), a medium pressure pipeline electric valve (12), a medium pressure pipeline reducer (13), a medium pressure reducer outlet pressure detector (14), a medium pressure desuperheater outlet steam temperature detector (15) and a medium pressure desuperheater regulating valve (16);

the temperature and pressure compensation calculation formula of the steam flow participated by the medium pressure reducer inlet steam pressure detector (10) and the medium pressure desuperheater inlet steam temperature detector (11) is as follows

The medium-pressure pipeline electric valve (12) is used for isolating or communicating an external heat supply pipeline;

the medium-pressure pipeline pressure reducer (13) and the medium-pressure reducer outlet pressure detector (14) perform closed-loop PID control pressure;

the medium-pressure desuperheater outlet steam temperature detector (15) and the medium-pressure desuperheater regulating valve (16) are used for performing closed-loop PID control on temperature.

4. The vapor pressure and temperature reduction control system of claim 1, wherein: the cooling water A pump (21) and the cooling water B pump (22) are interlocked with a condensed water tank liquid level detector (201) of the hot water tank (20), and the cooling water A pump (21) and the cooling water B pump (22) are controlled to stop when the condensed water tank liquid level detector (201) detects low liquid level alarm.

5. The vapor pressure and temperature reduction control system of claim 1, wherein: the booster A pump (23) and the booster B pump (24) are interlocked with a condensate water tank liquid level detector (201) of the hot water tank (20), the booster A pump (23) and the booster B pump (24) are controlled to be started when the condensate water tank liquid level detector (201) detects a high liquid level alarm, and the booster A pump (23) and the booster B pump (24) are controlled to be stopped when the condensate water tank liquid level detector (201) detects a low liquid level alarm.

6. The vapor pressure and temperature reduction control system of claim 1, wherein: the booster pump outlet regulating valve (18), the booster pump pressure detector (19) and the condensate tank liquid level detector (201) are subjected to closed-loop PID control, and when the outlet pressure of the booster pump pressure detector (19) is lower than 1000Kpa, the booster A pump (23) and the booster B pump (24) are controlled to be started.

7. The vapor pressure and temperature reduction control system of claim 4, wherein: the heat-reducing water A pump (21), the heat-reducing water B pump (22), the pressurizing A pump (23) and the pressurizing B pump (24) display current signal high alarm/high alarm, and alarm values can be set.

8. The vapor pressure and temperature reduction control system of claim 1, wherein: the low-pressure pipeline electric valve (4), the low-pressure temperature-reducing water regulating valve (8), the medium-pressure pipeline pressure reducer (13) and the medium-pressure temperature-reducing water regulating valve (16) are regulating valves controlled by 4-20mA analog quantity signals, the system adopts a function of outputting and maintaining a final output value by module communication faults, and the valve maintains a final output opening.

9. The vapor pressure and temperature reduction control system of claim 8, wherein: the signals of the low-pressure pipeline electric valve (4) and the medium-pressure pipeline electric valve (12) which participate in control are a preparation signal, a forward signal, a reverse signal, a start-stop signal, an on-position signal, an off-position signal and a position indication signal;

when the preparation signal is normal, the valve motor can be manually controlled to rotate forward and reversely through a picture to realize the valve switch;

the valve opening and closing action can be switched to be manual/automatic, the position signal can be preset through a picture, and when the valve is automatically opened or closed, the position indication reaches a set value, and the valve motor stops rotating forwards or reversely;

the picture can set the overtime alarm time of the valve switch, and when the valve is opened or closed to reach the alarm time, the valve motor stops rotating forward and backward.