CN109609194B - Slurry and oxygen feeding control method of multi-channel nozzle - Google Patents

Slurry and oxygen feeding control method of multi-channel nozzle Download PDF

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Publication number
CN109609194B
CN109609194B CN201811611412.3A CN201811611412A CN109609194B CN 109609194 B CN109609194 B CN 109609194B CN 201811611412 A CN201811611412 A CN 201811611412A CN 109609194 B CN109609194 B CN 109609194B
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slurry
oxygen
flow
channel
flow rate
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CN109609194A (en
Inventor
王锦
张勇
门长贵
朱春鹏
罗进成
林益安
杨云龙
韦孙昌
赵蒙
郑亚兰
曾梅
徐宏伟
贺根良
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SHAANXI COAL CHEMICAL ENGINEERING TECHNOLOGY RESEARCH CENTER
Xi'an Origin Chemical Technologies Co ltd
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SHAANXI COAL CHEMICAL ENGINEERING TECHNOLOGY RESEARCH CENTER
Xi'an Origin Chemical Technologies Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/46—Gasification of granular or pulverulent flues in suspension
    • C10J3/48—Apparatus; Plants
    • C10J3/50—Fuel charging devices
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/46—Gasification of granular or pulverulent flues in suspension
    • C10J3/54—Gasification of granular or pulverulent fuels by the Winkler technique, i.e. by fluidisation
    • C10J3/56—Apparatus; Plants
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/72—Other features
    • C10J3/723—Controlling or regulating the gasification process
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0903—Feed preparation
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0953—Gasifying agents
    • C10J2300/0959—Oxygen

Abstract

The invention discloses a slurry and oxygen feeding control method of a multi-channel nozzle, which comprises the following steps: firstly, acquiring and transmitting detection data; secondly, data processing and control of the slurry main channel and the oxygen main channel; and thirdly, controlling the flow of the slurry subchannel and the oxygen subchannel. The method has the advantages of simple steps, reasonable design, convenient implementation and good use effect, the slurry flow can be enlarged by 1.2-2 times compared with single-channel slurry feeding, the atomization is more uniform, and the combustion is more sufficient; in addition, slurry feeding can be diversified, other materials containing carbon and hydrogen except coal slurry are used as the pulping raw materials for reutilization, the environment is protected, the problems of uneven mixing, unsmooth conveying and the like caused by common pulping with the coal slurry are avoided, and the practicability is high.

Description

Slurry and oxygen feeding control method of multi-channel nozzle
Technical Field
The invention belongs to the technical field of slurry and oxygen feeding control, and particularly relates to a slurry and oxygen feeding control method of a multi-channel nozzle.
Background
The gasification of multicomponent slurry is to add proper additives to various solid residues and residual liquids of petroleum coke, petroleum pitch, coal, heavy oil and petroleum processing process to prepare qualified gasified slurry, and then react with oxygen at high temperature and high pressure to generate CO and H2A synthesis gas as a main component. At present, a prominent problem in the process of preparing synthesis gas by gasification is that the maximum coal feeding amount of the existing gasification device can be 2000 tons/day, and an important factor for restricting the large-scale gasification technology is the problems of slurry transportation and atomization. The slurry has the problems of deposition, nonuniform subsequent atomization, low conversion rate and the like due to the special characteristics, high viscosity, easy precipitation, easy blockage and the like of the slurry; it is desirable to develop a high coal input, high feedstock gasification process that requires a matched feed control process to achieve precise control of the ratio of oxygen to slurry or other hydrocarbon-containing feedstock combustion products. Therefore, a method for controlling the feeding of slurry and oxygen of a multi-channel nozzle is lacked at present, the flow rate of the slurry can be enlarged by 1.2-2 times compared with the feeding of single-channel slurry, the atomization is more uniform, and the combustion is more sufficient; in addition, slurry feeding can be diversified, other materials containing carbon and hydrogen except coal slurry are used as pulping raw materials for reutilization, the method is more environment-friendly, and meanwhile, the method avoids the problems that the prior pulping method is not environment-friendlyThe coal slurry and the coal slurry are jointly pulped, so that the problems of uneven mixing, unsmooth conveying and the like are caused,
disclosure of Invention
The technical problem to be solved by the invention is to provide a slurry and oxygen feeding control method of a multi-channel nozzle aiming at the defects in the prior art, the method has the advantages of simple steps, reasonable design, convenient implementation and good use effect, the slurry flow can be enlarged by 1.2-2 times compared with single-channel slurry feeding, the atomization is more uniform, and the combustion is more sufficient; in addition, slurry feeding can be diversified, other materials containing carbon and hydrogen except coal slurry are used as the pulping raw materials for reutilization, the environment is protected, the problems of uneven mixing, unsmooth conveying and the like caused by common pulping with the coal slurry are avoided, and the practicability is high.
In order to solve the technical problems, the invention adopts the technical scheme that: a device adopted by the method comprises a multi-channel nozzle and a control module, wherein the multi-channel nozzle comprises a nozzle, a slurry conveying mechanism and an oxygen conveying mechanism which are arranged on the nozzle, the slurry conveying mechanism comprises a slurry channel, a slurry flow detection module and a slurry conveying adjusting mechanism, the slurry channel comprises a central oxygen slurry channel and an epoxy slurry channel, the oxygen conveying mechanism comprises a central oxygen channel, a middle ring pipe oxygen channel and an outer ring pipe oxygen channel, the central oxygen channel is connected with the oxygen main channel, the control module comprises a controller, a display screen and an alarm, the display screen and the alarm are connected with the controller, a first adjusting valve and a first oxygen partial flow detection unit are arranged on the central oxygen channel, a second adjusting valve and a second oxygen partial flow detection unit are arranged on the middle ring pipe oxygen channel, the utility model discloses a pressure measuring device for a slurry, including outer ring tube oxygen passageway, be provided with third governing valve and third oxygen partial flow detecting element on the outer ring tube oxygen passageway, be provided with total volume of oxygen flow detecting element, total temperature detecting element of oxygen and total pressure detecting element of oxygen on the total passageway of oxygen, the output that ground paste flow detecting module, first oxygen partial flow detecting element, second oxygen partial flow detecting element, third oxygen partial flow detecting element, total volume of oxygen flow detecting element, total temperature detecting element of oxygen and total pressure detecting element of oxygen all is connected with the controller, adjustment mechanism, first governing valve, second governing valve and third governing valve are carried by the controller to the ground paste and are controlled, other characterized in that, this method includes following step:
step one, acquisition and transmission of detection data:
step 101, in the slurry conveying process, the slurry flow detection module detects the total mass flow of the slurry in the slurry channel and sends the detected total mass flow measurement value of the slurry to a controller;
102, in the oxygen conveying process, detecting the total oxygen volume flow in an oxygen total channel by an oxygen total volume flow detecting unit, sending the detected total oxygen volume flow to a controller, detecting the total oxygen temperature in the oxygen total channel by an oxygen total temperature detecting unit, sending the detected total oxygen temperature to the controller, detecting the total oxygen pressure in the oxygen total channel by an oxygen total pressure detecting unit, and sending the detected total oxygen pressure to the controller;
step two, data processing and control of the slurry main channel and the oxygen main channel:
step 201, the controller according to the formula
Figure GDA0002755612490000031
Obtaining the total volume flow compensation value F of oxygeny(ii) a Wherein, PiRepresents the total oxygen pressure detected by the total oxygen pressure detecting unitiIndicating the total temperature of oxygen, P, detected by the total oxygen temperature detecting unitbIndicating the compensated reference pressure, TbRepresents a compensated reference temperature;
step 202, the controller according to formula Fc＝FyX alpha to obtain the measured value F of the total volume flow of the oxygenc(ii) a Wherein α represents the volume purity of oxygen;
step 203, the controller calls a difference value comparator to compare the difference value of the received slurry total mass flow measurement value with a slurry total mass flow set value to obtain a slurry deviation value, and calls a PI (proportional integral) adjusting module to process the slurry deviation value and adjust the conveying flow of the slurry conveying adjusting mechanism until the slurry total mass flow detection value is maintained at the slurry total mass flow set value;
at the same time, the controller retrieves the difference comparator from the received oxygen total volume flow measurement FcThe difference value of the total oxygen flow set value and the total oxygen flow set value is compared to obtain an oxygen deviation value, the controller calls the PI adjusting module to process the oxygen deviation value to obtain the opening of the total oxygen control valve until the measured value of the total oxygen flow is maintained at the set value of the total oxygen flow set value;
step three, controlling the flow of the slurry sub-channel and the oxygen sub-channel:
301, obtaining an oxygen flow dividing set value of the central oxygen channel, an oxygen flow dividing set value of the middle ring pipe oxygen channel and an oxygen flow dividing set value of the outer ring pipe oxygen channel according to the oxygen total volume flow set value; wherein, the oxygen flow rate set value of the central oxygen passage is 5-10% of the total oxygen volume flow rate set value, the oxygen flow rate set value of the middle ring tube oxygen passage is 35-45% of the total oxygen volume flow rate set value, and the oxygen flow rate set value of the outer ring tube oxygen passage is 45-60% of the total oxygen volume flow rate set value;
step 302, in the process of delivering oxygen, a first oxygen partial flow detection unit detects the flow in the central oxygen passage and sends the measured first oxygen partial flow measurement value to a controller, a second oxygen partial flow detection unit detects the flow in the oxygen passage of the central loop and sends the measured second oxygen partial flow measurement value to the controller, and a third oxygen partial flow detection unit detects the flow in the oxygen passage of the outer loop and sends the measured third oxygen partial flow measurement value to the controller;
step 303, the controller calls a difference value comparator to compare a difference value between a received first oxygen partial flow measurement value and an oxygen partial flow set value of the central oxygen channel to obtain a first oxygen partial flow deviation value, and the controller calls a PI adjusting module to process the first oxygen partial flow measurement value deviation value to obtain the opening of a first adjusting valve until the first oxygen partial flow measurement value is maintained at the oxygen partial flow set value of the central oxygen channel;
the controller calls the difference value comparator to compare the received second oxygen partial flow measurement value with the oxygen partial flow set value of the middle ring pipe oxygen channel to obtain a second oxygen partial flow deviation value, and calls the PI adjusting module to process the second oxygen partial flow measurement value deviation value to obtain the opening of a second adjusting valve until the second oxygen partial flow measurement value is maintained at the oxygen partial flow set value of the middle ring pipe oxygen channel;
the controller calls the difference comparator to perform difference comparison on the received third oxygen flow rate measured value and the oxygen flow rate set value of the outer ring pipe oxygen channel to obtain a third oxygen flow rate deviation value, and calls the PI adjusting module to process the third oxygen flow rate measured value deviation value to obtain the opening of the third adjusting valve until the third oxygen flow rate measured value is maintained at the oxygen flow rate set value of the outer ring pipe oxygen channel.
The slurry and oxygen feeding control method of the multi-channel nozzle is characterized in that: the input ends of the central oxygen slurry channel and the epoxy slurry channel are connected with a slurry total channel, the slurry flow detection module comprises a first slurry total flow detection unit, a second slurry total flow detection unit and a third slurry total flow detection unit which are arranged on the slurry total channel, the slurry conveying and adjusting mechanism comprises a high-pressure slurry total pump arranged on the slurry total channel and a total motor for driving the high-pressure slurry total pump, the output ends of the first slurry total flow detection unit, the second slurry total flow detection unit and the third slurry total flow detection unit are all connected with a controller, and the total motor is controlled by the controller;
the specific process of obtaining the slurry total mass flow measurement value in step 101 is as follows:
step 1011, in the slurry conveying process, the first slurry total flow detection unit, the second slurry total flow detection unit and the third slurry total flow detection unit respectively detect the total mass flow of the slurry in the slurry total channel, and send the detected total mass flow of the first slurry, the detected total mass flow of the second slurry and the detected total mass flow of the third slurry to the controller;
and step 1012, the controller adjusts the intermediate value selection module to select the total mass flow of the first slurry, the total mass flow of the second slurry and the total mass flow of the third slurry, and the total mass flow of the intermediate slurry is used as the measured value of the total mass flow of the slurry.
The slurry and oxygen feeding control method of the multi-channel nozzle is characterized in that: the slurry flow detection module comprises a first slurry flow rate detection unit, a second slurry flow rate detection unit, a third slurry flow rate detection unit, a fourth slurry flow rate detection unit, a fifth slurry flow rate detection unit and a sixth slurry flow rate detection unit, wherein the first slurry flow rate detection unit, the second slurry flow rate detection unit and the third slurry flow rate detection unit are arranged on the central oxygen slurry channel;
the slurry conveying adjusting mechanism comprises a first high-pressure slurry pump, a first motor, a second high-pressure slurry pump and a second motor, wherein the first high-pressure slurry pump is arranged on the central oxygen slurry channel, the first motor drives the first high-pressure slurry pump, the second high-pressure slurry pump is arranged on the epoxy slurry channel, the second motor drives the second high-pressure slurry pump, the output ends of the first slurry flow rate detecting unit, the second slurry flow rate detecting unit, the third slurry flow rate detecting unit, the fourth slurry flow rate detecting unit, the fifth slurry flow rate detecting unit and the sixth slurry flow rate detecting unit are all connected with a controller, and the first motor and the second motor are controlled by the controller;
the specific process of obtaining the slurry total mass flow measurement value in step 101 is as follows:
step A, in the slurry conveying process, a first slurry flow rate detection unit, a second slurry flow rate detection unit and a third slurry flow rate detection unit respectively detect the slurry flow rate in a central oxygen slurry channel, and send the detected first slurry flow rate, second slurry flow rate and third slurry flow rate to a controller;
the fourth slurry flow rate detection unit, the fifth slurry flow rate detection unit and the sixth slurry flow rate detection unit respectively detect the slurry flow rates in the epoxy slurry channels, and send the detected fourth slurry flow rate, fifth slurry flow rate and sixth slurry flow rate to the controller;
b, the controller adjusts a middle value selection module, the first slurry flow rate, the second slurry flow rate and the third slurry flow rate are selected, and the slurry flow rate in the middle is used as a slurry flow rate median value in the central oxygen slurry channel;
the controller adjusts the intermediate value selection module to select the fourth slurry flow rate, the fifth slurry flow rate and the sixth slurry flow rate, and the slurry flow rate in the middle is used as the median of the slurry flow rate in the epoxy slurry channel;
and step C, obtaining a total mass flow measurement value of the slurry by the controller according to the slurry flow split median value in the central oxygen slurry channel and the slurry flow split median value in the epoxy slurry channel.
The slurry and oxygen feeding control method of the multi-channel nozzle is characterized in that: the process of obtaining the total slurry mass flow set value and the total oxygen volume flow set value in step 203 is as follows:
step 2031, setting the load value of the total volume flow of oxygen, the load value of the total mass flow of slurry and the ratio of the total volume flow of oxygen to the total volume flow of slurry;
step 2032, the controller calls a division module, and inputs the ratio of the total volume flow of the oxygen to the total volume flow of the slurry and the measured value of the total volume flow of the oxygen to obtain a calculated value of the total volume flow of the slurry; the controller calls the division module and inputs the measured value of the total mass flow of the slurry and the density of the slurry to obtain the measured value of the total volume flow of the slurry; the controller calls the multiplication module and inputs the ratio of the total volume flow of the oxygen to the total volume flow of the slurry and the measured value of the total volume flow of the slurry to obtain a calculated value of the total volume flow of the oxygen;
step 2033, the controller calls a division module, and inputs the total mass flow load value and the density of the slurry to obtain the total volume flow load value of the slurry;
step 2034, the controller calls a high value selection module, and selects a high value from the calculated value of the total volume flow of the slurry and the load value of the total volume flow of the slurry as a set value of the total volume flow of the slurry; the controller calls the multiplication module and inputs a slurry total volume flow set value and a slurry density to obtain a slurry total mass flow set value; the controller calls a low value selection module, and selects a low value from the calculated oxygen total volume flow value and the load value of the oxygen total volume flow as a set value of the oxygen total volume flow.
The slurry and oxygen feeding control method of the multi-channel nozzle is characterized in that: the method also comprises the following steps of adjusting the flow rate of the slurry, and the specific process is as follows:
the method comprises the following steps of (a) obtaining a slurry equivalent weight flow rate set value of a central oxygen slurry channel and a slurry equivalent weight flow rate set value of an epoxy slurry channel according to a slurry total mass flow rate set value; wherein, the slurry equivalent weight flow rate set value of the central oxygen slurry channel is 30-50% of the total slurry mass flow rate set value, and the slurry flow rate set value of the epoxy slurry channel is 50-70% of the total slurry mass flow rate set value;
the controller compares the difference value of the slurry flow splitting medium value in the central oxygen slurry channel with the slurry equivalent flow splitting set value of the central oxygen slurry channel to obtain a first slurry flow splitting measured value deviation value, the controller calls a PI (proportional integral) adjusting module to process the first slurry flow splitting measured value deviation value to obtain a first rotation speed control signal of a first motor for controlling a first high-pressure slurry pump, and the controller adjusts the rotation speed of the first motor according to the first rotation speed control signal until the slurry flow splitting medium value in the central oxygen slurry channel is maintained at the slurry equivalent flow splitting set value of the central oxygen slurry channel;
meanwhile, the controller compares the difference value of the slurry flow splitting medium value in the epoxy slurry channel with the slurry flow splitting set value of the epoxy slurry channel to obtain a second slurry flow splitting measured value deviation value, the controller calls the PI adjusting module to process the second slurry flow splitting measured value deviation value to obtain a second rotating speed control signal of a second motor for controlling a second high-pressure slurry pump, and the controller adjusts the rotating speed of the second motor according to the second rotating speed control signal until the slurry flow splitting medium value in the epoxy slurry channel is maintained at the slurry flow splitting set value of the epoxy slurry channel.
The slurry and oxygen feeding control method of the multi-channel nozzle is characterized in that: the controller calls the PI adjusting module to process the slurry deviation value, adjusts the conveying flow of the slurry conveying adjusting mechanism until the slurry total mass flow detection value is maintained at the slurry total mass flow set value, and the specific process is as follows:
and the controller calls the PI adjusting module to process the slurry deviation value to obtain a total motor rotating speed control signal for controlling a total motor of the high-pressure slurry master pump, and adjusts the rotating speed of the total motor according to the total motor rotating speed control signal until the slurry total mass flow detection value is maintained at the slurry total mass flow set value.
The slurry and oxygen feeding control method of the multi-channel nozzle is characterized in that: and C, obtaining the measured value of the total mass flow of the slurry in the step C as follows:
when the central oxygen slurry channel and the epoxy slurry channel are both coal slurry, the controller sets the formula D as L1+L2Obtaining the measured value D, L of the total mass flow of the slurry1Represents the median flow rate, L, of the slurry in the central oxygen slurry channel2Representing the median of the flow rate of the slurry in the epoxy slurry channel;
when other materials containing carbon and hydrogen are arranged in the central oxygen slurry channel and coal slurry is arranged in the epoxy slurry channel, the controller is arranged according to the formula D (A multiplied by L)1+L2Obtaining a total mass flow measurement value D of the slurry; wherein a represents an equivalent transformation coefficient.
The slurry and oxygen feeding control method of the multi-channel nozzle is characterized in that: the other hydrocarbon-containing materials are coal tar, organic waste liquid or heavy oil;
when the other hydrocarbon-containing material is coal tar, A is 2.12;
when the other hydrocarbon-containing materials are organic waste liquid, A is 1.12; wherein the calorific value of the organic waste liquid is not less than 12000 kJ/kg;
when the other hydrocarbon-containing material is heavy oil, A is 2.25.
Compared with the prior art, the invention has the following advantages:
1. the method has simple steps and reasonable design, improves the uniformity of atomization of the slurry and other materials with oxygen, and improves the gasification efficiency.
2. The invention is provided with a central oxygen slurry channel and an epoxy slurry channel, the slurry flow can be enlarged by 1.2-2 times compared with single-channel slurry feeding, the oxygen conveying mechanism comprises a central oxygen channel, a middle ring pipe oxygen channel and an outer ring pipe oxygen channel, wherein the oxygen main channel is connected with the oxygen main channel, and the oxygen and the slurry are atomized more uniformly and combusted more fully; the slurry feeding of the other two slurry channels can be diversified, other materials containing carbon and hydrogen except coal slurry are used as the pulping raw materials for reutilization, the environment is protected, and the problems of uneven mixing, unsmooth conveying and the like caused by the joint pulping of the coal slurry are avoided.
3. The controller respectively adjusts the oxygen flow distribution entering the central oxygen channel, the oxygen flow distribution of the middle ring pipe oxygen channel and the oxygen flow distribution of the outer ring pipe oxygen channel so as to respectively meet the set value of the oxygen flow distribution of the central oxygen channel, the set value of the oxygen flow distribution of the middle ring pipe oxygen channel and the set value of the oxygen flow distribution of the outer ring pipe oxygen channel, and the three oxygen flow controls are easy to realize, safe and reliable.
4. The invention aims to fully atomize slurry particles, ensure partial oxidation combustion reaction of synthesis gas and avoid damage to refractory bricks so as to effectively adapt to the load, pressure and furnace temperature of a gasification furnace.
In conclusion, the method has the advantages of simple steps, reasonable design, convenience in implementation and good use effect, the slurry flow can be enlarged by 1.2-2 times compared with single-channel slurry feeding, the atomization is more uniform, and the combustion is more sufficient; in addition, slurry feeding can be diversified, other materials containing carbon and hydrogen except coal slurry are used as the pulping raw materials for reutilization, the environment is protected, the problems of uneven mixing, unsmooth conveying and the like caused by common pulping with the coal slurry are avoided, and the practicability is high.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a second embodiment of the present invention.
FIG. 3 is a block diagram of a method flow of the present invention.
Description of reference numerals:
1-total oxygen channel; 2-oxygen total volume flow detection unit;
3-oxygen total temperature detection unit; 4-oxygen total pressure detection unit;
5, an outer ring tube oxygen channel; 6-middle ring pipe oxygen channel; 7-central oxygen channel;
8-a first oxygen partial flow rate detection unit; 9-a second oxygen partial flow detection unit;
10-third oxygen partial flow detection unit; 11-third regulating valve;
12-a second regulating valve; 13-a first regulating valve;
14-a nozzle; 15-a central oxygen slurry channel;
16-epoxy slurry channels; 17 — a third slurry total flow rate detection unit;
18-a second slurry total flow rate detection unit; 19-first slurry total flow rate detecting unit;
20-slurry main channel; 21-total motor;
23-oxygen main control valve; 25-a controller;
26-a display screen; 27-an alarm;
29-high pressure slurry master cylinder; 30-a second high-pressure slurry pump;
31 — a second motor; 32-a fourth slurry flow rate detection unit;
33-a fifth slurry flow rate detection unit; 34-sixth slurry flow rate detection unit;
35-a first high pressure slurry pump; 36 — a first motor;
37-a first slurry flow rate detection unit; 38-second slurry flow rate detection unit;
39-third slurry flow rate detection unit.
Detailed Description
A slurry and oxygen feed control method for a multi-channel nozzle is described generally by way of examples 1 through 6.
Example 1
As shown in fig. 1 and 3, a slurry and oxygen feeding control method of a multi-channel nozzle comprises a multi-channel nozzle and a control module, wherein the multi-channel nozzle comprises a nozzle 14, a slurry conveying mechanism and an oxygen conveying mechanism which are arranged on the nozzle 14, the slurry conveying mechanism comprises a slurry channel, a slurry flow detection module and a slurry conveying adjustment mechanism, the slurry channel comprises a central oxygen slurry channel 15 and an epoxy slurry channel 16, the oxygen conveying mechanism comprises a central oxygen channel 7, a middle ring pipe oxygen channel 6 and an outer ring pipe oxygen channel 5, the oxygen main channel 1 is connected with the oxygen main channel 1, the control module comprises a controller 25, and a display screen 26 and an alarm 27 which are connected with the controller 25, the central oxygen channel 7 is provided with a first adjusting valve 13 and a first oxygen partial flow detection unit 8, a second regulating valve 12 and a second oxygen partial flow detection unit 9 are arranged on the middle ring pipe oxygen channel 6, a third regulating valve 11 and a third oxygen partial flow detection unit 10 are arranged on the outer ring pipe oxygen channel 5, a total oxygen volume flow detection unit 2, a total oxygen temperature detection unit 3 and a total oxygen pressure detection unit 4 are arranged on the total oxygen channel 1, output ends of the slurry flow detection module, the first oxygen partial flow detection unit 8, the second oxygen partial flow detection unit 9, the third oxygen partial flow detection unit 10, the total oxygen volume flow detection unit 2, the total oxygen temperature detection unit 3 and the total oxygen pressure detection unit 4 are all connected with a controller 25, and the slurry conveying and regulating mechanism, the first regulating valve 13, the second regulating valve 12 and the third regulating valve 11 are all controlled by the controller 25; the method comprises the following steps:
step one, acquisition and transmission of detection data:
step 101, in the slurry conveying process, the slurry flow detection module detects the total mass flow of the slurry in the slurry channel and sends the detected total mass flow measurement value of the slurry to the controller 25;
102, in the oxygen conveying process, detecting the total volume flow of oxygen in an oxygen main channel 1 by an oxygen total volume flow detecting unit 2, sending the detected total volume flow of oxygen to a controller 25, detecting the total temperature of oxygen in the oxygen main channel 1 by an oxygen total temperature detecting unit 3, sending the detected total temperature of oxygen to the controller 25, detecting the total pressure of oxygen in the oxygen main channel 1 by an oxygen total pressure detecting unit 4, and sending the detected total pressure of oxygen to the controller 25;
step two, data processing and control of the slurry main channel and the oxygen main channel:
step 201, controller 25 calculates
Figure GDA0002755612490000111
Obtaining the total volume flow compensation value F of oxygeny(ii) a Wherein, PiRepresents the total oxygen pressure, T, detected by the total oxygen pressure detecting unit 4iIndicates the total temperature of oxygen, P, detected by the total oxygen temperature detecting unit 3bIndicating the compensated reference pressure, TbRepresents a compensated reference temperature;
step 202, controller 25 calculates according to formula Fc＝FyX alpha to obtain the measured value F of the total volume flow of the oxygenc(ii) a Wherein α represents the volume purity of oxygen;
step 203, the controller 25 calls a difference value comparator to compare the difference value of the received slurry total mass flow measurement value with a slurry total mass flow set value to obtain a slurry deviation value, the controller 25 calls a PI (proportional integral) adjusting module to process the slurry deviation value, and the conveying flow of the slurry conveying adjusting mechanism is adjusted until the slurry total mass flow detection value is maintained at the slurry total mass flow set value;
at the same time, controller 25 retrieves a difference comparator of the received oxygen total volumetric flow measurements FcComparing the difference value with the total oxygen flow set value to obtain an oxygen deviation value, calling a PI (proportional integral) adjusting module by the controller 25 to process the oxygen deviation value to obtain the opening degree of the total oxygen control valve 23 until the total oxygen flow measured value is maintained at the total oxygen flow set value;
step three, controlling the flow of the slurry sub-channel and the oxygen sub-channel:
301, obtaining an oxygen flow dividing set value of the central oxygen channel 7, an oxygen flow dividing set value of the middle ring pipe oxygen channel 6 and an oxygen flow dividing set value of the outer ring pipe oxygen channel 5 according to the oxygen total volume flow set value; wherein, the oxygen flow rate set value of the central oxygen passage 7 is 5-10% of the total oxygen volume flow rate set value, the oxygen flow rate set value of the middle ring tube oxygen passage 6 is 35-45% of the total oxygen volume flow rate set value, and the oxygen flow rate set value of the outer ring tube oxygen passage 5 is 45-60% of the total oxygen volume flow rate set value;
step 302, in the process of delivering oxygen, a first oxygen partial flow detection unit 8 detects the flow in the central oxygen passage 7 and sends the measured first oxygen partial flow measurement value to the controller 25, a second oxygen partial flow detection unit 9 detects the flow in the central loop oxygen passage 6 and sends the measured second oxygen partial flow measurement value to the controller 25, and a third oxygen partial flow detection unit 10 detects the flow in the outer loop oxygen passage 5 and sends the measured third oxygen partial flow measurement value to the controller 25;
step 303, the controller 25 calls a difference value comparator to compare a difference value between the received first oxygen partial flow measurement value and an oxygen partial flow set value of the central oxygen passage 7 to obtain a first oxygen partial flow deviation value, and the controller 25 calls a PI regulation module to process the first oxygen partial flow measurement value deviation value to obtain the opening of the first regulating valve 13 until the first oxygen partial flow measurement value is maintained at the oxygen partial flow set value of the central oxygen passage 7;
the controller 25 calls a difference comparator to compare the difference between the received second oxygen partial flow measurement value and the oxygen partial flow set value of the middle ring pipe oxygen channel 7 to obtain a second oxygen partial flow deviation value, and the controller 25 calls a PI (proportional integral) adjusting module to process the second oxygen partial flow measurement value deviation value to obtain the opening of the second adjusting valve 12 until the second oxygen partial flow measurement value is maintained at the oxygen partial flow set value of the middle ring pipe oxygen channel 6;
the controller 25 calls a difference comparator to perform difference comparison on the received third oxygen partial flow measurement value and the oxygen partial flow setting value of the outer ring oxygen channel 7 to obtain a third oxygen partial flow deviation value, and the controller 25 calls a PI (proportional integral) adjusting module to process the third oxygen partial flow measurement value deviation value to obtain the opening degree of the third adjusting valve 11 until the third oxygen partial flow measurement value is maintained at the oxygen partial flow setting value of the outer ring oxygen channel 5.
In this embodiment, the input ends of the central oxygen slurry channel 15 and the epoxy slurry channel 16 are connected to a total slurry channel 20, the slurry flow rate detection module includes a first total slurry flow rate detection unit 19, a second total slurry flow rate detection unit 18, and a third total slurry flow rate detection unit 17 that are arranged on the total slurry channel 20, the slurry transport adjustment mechanism includes a high-pressure total slurry pump 29 that is arranged on the total slurry channel 20, and a total motor 21 that drives the high-pressure total slurry pump 29, the output ends of the first total slurry flow rate detection unit 19, the second total slurry flow rate detection unit 18, and the third total slurry flow rate detection unit 17 are all connected to a controller 25, and the total motor 21 is controlled by the controller 25;
the specific process of obtaining the slurry total mass flow measurement value in step 101 is as follows:
step 1011, in the slurry conveying process, the first slurry total flow rate detection unit 19, the second slurry total flow rate detection unit 18 and the third slurry total flow rate detection unit 17 respectively detect the total mass flow rate of the slurry in the slurry total channel 20, and send the detected first slurry total mass flow rate, second slurry total mass flow rate and third slurry total mass flow rate to the controller 25;
step 1012, the controller 25 adjusts the intermediate value selection module to select the total mass flow of the first slurry, the total mass flow of the second slurry and the total mass flow of the third slurry, and uses the total mass flow of the intermediate slurry as the measured value of the total mass flow of the slurry.
In this embodiment, the process of obtaining the total slurry mass flow set value and the total oxygen volume flow set value in step 203 specifically includes the following steps:
step 2031, setting the load value of the total volume flow of oxygen, the load value of the total mass flow of slurry and the ratio of the total volume flow of oxygen to the total volume flow of slurry;
step 2032, the controller 25 calls a division module, and inputs the ratio of the total volume flow of oxygen to the total volume flow of the slurry and the measured value of the total volume flow of oxygen to obtain a calculated value of the total volume flow of the slurry; the controller 25 calls the division module and inputs the measured value of the total mass flow of the slurry and the density of the slurry to obtain the measured value of the total volume flow of the slurry; the controller 25 calls the multiplication module and inputs the ratio of the total volume flow of the oxygen to the total volume flow of the slurry and the measured value of the total volume flow of the slurry to obtain a calculated value of the total volume flow of the oxygen;
step 2033, the controller 25 calls a division module, and inputs the total mass flow load value and the density of the slurry to obtain the total volume flow load value of the slurry;
step 2034, the controller 25 calls a high value selection module, and selects a high value from the calculated value of the total volume flow of the slurry and the load value of the total volume flow of the slurry as a set value of the total volume flow of the slurry; the controller 25 calls the multiplication module and inputs a slurry total volume flow set value and a slurry density to obtain a slurry total mass flow set value; the controller 25 calls a low value selection module, and selects a low value from the calculated oxygen total volume flow value and the load value of the oxygen total volume flow as a set value of the oxygen total volume flow.
In this embodiment, the controller 25 calls the PI adjustment module to process the slurry deviation value, and adjusts the transport flow of the slurry transport adjustment mechanism until the total slurry mass flow detection value is maintained at the total slurry mass flow set value, which includes the following specific processes:
the controller 25 calls the PI adjusting module to process the slurry deviation value to obtain a total motor rotating speed control signal of a total motor 21 for controlling the high-pressure slurry master pump 29, and the controller 25 adjusts the rotating speed of the total motor 21 according to the total motor rotating speed control signal until the slurry total mass flow detection value is maintained at the slurry total mass flow set value.
In this embodiment, the value of the volume purity α of the oxygen is greater than 99.6%.
In this embodiment, the total oxygen volume flow compensation value is obtained by using a system and a method for controlling the temperature of the entrained-flow reactor disclosed in chinese patent application No. CN200910119843.2, which is filed 3, 20, 2009.
In this embodiment, the slurry and the oxygen flow are exchanged and atomized into fine particles, and the atomized particles absorb heat to perform evaporation, drying, pyrolysis, combustion, gasification, and the like, thereby finally generating an effective gas (CO + H) for chemical synthesis2)。
In this embodiment, the multi-channel nozzle includes three oxygen channels and two slurry channels, and only includes one slurry channel and two oxygen channels, as compared with a three-channel burner commonly used in a gasification furnace at present, the multi-channel nozzle is considered from the following aspects: firstly, the problems of precipitation, blockage and the like of the existing slurry due to the special characteristics and high viscosity of the slurry are solved, so that the precipitation can exist when a large amount of slurry is conveyed by one pipeline, and the problems of nonuniform subsequent atomization, low conversion rate and the like caused by the large amount of the introduced slurry when the oxygen conveying amount is constant are considered; secondly, because only simple coal slurry is adopted to gasify raw materials to prepare synthesis gas at present, other gasified materials and coal are not found to gasify together to generate synthesis gas, however, through tests, the content of the effective synthesis gas is improved by 5-15% through coal and heavy oil co-gasification compared with that of the effective synthesis gas generated through single coal gasification, and the oxygen consumption is reduced by 7-30%, and the two slurry channels are arranged so as to facilitate the conveying of different gasified materials; thirdly, the feeding amount of the slurry is increased, so that the scale is conveniently expanded; fourthly, in order to feed slurry in a diversified manner, other gasification raw materials such as organic waste liquid, heavy oil, coal tar and the like are reused as pulping raw materials, so that the environment is protected, and the problems of uneven mixing, unsmooth conveying and the like caused by the co-pulping with coal slurry are avoided.
In this embodiment, the oxygen channels include a central oxygen channel 7, a middle ring tube oxygen channel 6, and an outer ring tube oxygen channel 5, where the oxygen main channel 1 is connected to the oxygen main channel 1, because: under the impact, expansion and carrying effects of the first central oxygen channel 7 on the slurry from the central oxygen slurry channel 15 positioned between the central oxygen channel 7 and the middle ring pipe oxygen channel 6, the slurry moves forwards along with the oxygen, so that the high-viscosity slurry is primarily atomized by the oxygen; in the process that the oxygen and the slurry move forwards, the oxygen in the middle ring pipe oxygen channel 6 impacts the primarily atomized slurry, so that the oxygen and the slurry are fully mixed, and full atomization is realized; meanwhile, the oxygen in the oxygen channel 6 of the middle ring pipe can preliminarily atomize the other slurry in the epoxy slurry channel 16, and the oxygen channel 5 of the outer ring pipe can disperse the atomized other slurry in the epoxy slurry channel 16 to separate the other slurry particles by the oxygen, so that the other slurry is fully contacted with the oxygen; secondly, a slurry channel is arranged between the two oxygen channels, so that the slurry is driven to flow by utilizing high-speed oxygen flow, and the flow of the slurry can be promoted on one hand, and the precipitation of the slurry is avoided; on the other hand, in order to utilize the high-speed oxygen to impact the coal slurry, the impact force of the oxygen is larger than the surface tension of the slurry, so that the oxygen can surround the particles of the coal slurry, and the slurry is sufficiently atomized under the impact of the oxygen.
In this embodiment, the set value of the oxygen partial flow of the central oxygen passage 7 is 5% -10% of the set value of the total volume flow of oxygen, the set value of the oxygen partial flow of the middle ring pipe oxygen passage 6 is 35% -45% of the set value of the total volume flow of oxygen, and the set value of the oxygen partial flow of the outer ring pipe oxygen passage 5 is 45% -60% of the set value of the total volume flow of oxygen; firstly, the oxygen flow dividing set value of the central oxygen channel 7 is ensured to be smaller than the oxygen flow dividing set value of the middle ring pipe oxygen channel 6 and the oxygen flow dividing set value of the outer ring pipe oxygen channel 5, so that the slurry in the central oxygen slurry channel 15 can be fully atomized after the oxygen in the middle ring pipe oxygen channel 6 is sprayed out; the oxygen flow rate set value of the outer ring tube oxygen channel 5 is larger than that of the middle ring tube oxygen channel 6, so that the oxygen of the outer ring tube oxygen channel 5 can fully atomize the other slurry in the epoxy slurry channel 16 after being sprayed; the oxygen flow rate set value of the second central oxygen channel 7 is 5% -10% of the oxygen total volume flow rate set value, in order to improve the flow density distribution of the slurry sprayed out of the central oxygen channel 7 as much as possible, and in order to increase the apparent opening angle of the torch; in addition, the load and the pressure of the gasification furnace are considered, and the method is effectively suitable for the furnace temperature, the furnace condition and the slag in the slag of the gasification furnace; thirdly, the set value of the oxygen flow rate of the middle ring pipe oxygen channel 6 is 35-45% of the set value of the total oxygen volume flow rate, because if the set value of the oxygen flow rate of the middle ring pipe oxygen channel 6 is more than 45% of the set value of the total oxygen volume flow rate, the diffusion, the precipitation and the insufficient combustion of coal slurry can be accelerated, and the problems of slag hole blockage, insufficient combustion and the like of the gasification furnace can be caused; if the oxygen flow rate of the oxygen passage 6 of the middle ring pipe is less than 35 percent of the total oxygen flow rate, the coal slurry atomization effect can be influenced, and the excessive oxygen flow rate of the outer ring pipe, the overtemperature of the furnace wall, the low conversion rate and the like can be caused; fourthly, the set value of the oxygen flow rate of the outer ring oxygen channel 5 is 45-60% of the set value of the total oxygen volume flow rate, because if the oxygen flow rate of the outer ring oxygen channel 5 is more than 60% of the set value of the total oxygen volume flow rate, on one hand, oxygen can rapidly pass through the nozzle, oxygen washes the refractory bricks, and the impact force generated by the oxygen can cause the damage of the refractory bricks; on the other hand, the oxygen drives the slurry to move forwards quickly, so that the atomization time of the oxygen and the slurry particles is reduced, and the insufficient atomization is caused; if the oxygen flow rate of the outer ring pipe oxygen channel 5 is less than 40% of the total oxygen flow rate set value, the slurry particles cannot be sufficiently atomized, so that large particles in the slurry move downwards, the gasification rate is locally too high at the top, the synthesis gas is oxidized and combusted, the temperature of the top of the gasification furnace is increased, and refractory bricks are influenced by high temperature and are damaged quickly.
In this embodiment, a high value is selected from the slurry total mass flow calculation value and the slurry total mass flow load value as a slurry total mass flow set value, and a low value is selected from the oxygen total volume flow calculation value and the oxygen total volume flow load value as an oxygen total volume flow set value, so that when the gasification load is increased, the slurry flow is increased first, and then the oxygen flow is increased, thereby avoiding the occurrence of a dangerous event caused by the excessive oxygen of the gasification furnace due to the increase of oxygen. In addition, the high-purity oxygen exerts high oxidation capacity to ablate the nozzle at high temperature, so that the fire resistance is damaged at high-temperature strength; secondly, the problem that the oxygen increment is larger than the slurry amount, so that the oxygen is excessive, oxidation reaction is caused, partial oxidation reaction cannot be carried out, and the yield of the synthesis gas is reduced is avoided; when the load is reduced, the flow of oxygen is reduced firstly, and then the flow of slurry is reduced, so that the phenomenon that the pressure of the gasification furnace is too large and explosion occurs due to too fast increase of oxygen is avoided; in addition, the problem that the oxygen increase is larger than the slurry amount, so that the oxygen is excessive, oxidation reaction is caused, partial oxidation reaction cannot be carried out, and the yield of the synthesis gas is reduced is avoided.
In this embodiment, the slurry split flow of the central oxygen slurry passage 15 is adjusted by the first high-pressure slurry pump 35, and the slurry split flow of the epoxy slurry passage 16 is adjusted by the second high-pressure slurry pump 30: firstly, in the process of conveying gasification raw materials, the viscosity of the gasification raw materials is higher in the two slurry channels, so that the surface tension of the slurry with high viscosity is higher, and the slurry is not beneficial to crushing slurry particles during atomization, so that the atomization effect is poor, and therefore, the flow in the slurry channels needs to be adjusted to improve the fluidity of the coal slurry and reduce the poor atomization effect caused by high local viscosity and the like caused by precipitation of the coal slurry; secondly, two slurry pumps are arranged to independently adjust the two slurry channels, so that the set value of the equivalent weight flow of the slurry of the central oxygen slurry channel 15 is 30-50% of the set value of the total mass flow of the slurry, and the set value of the flow of the slurry of the epoxy slurry channel 16 is 50-70% of the set value of the total mass flow of the slurry, so that the heavy oil resource is changed into valuable, the resource complementation of the heavy oil and the slurry gasification is realized, and the resource is maximally utilized; thirdly, the problems of uneven mixing, unsmooth conveying and the like caused by the mixed pulping of other raw materials such as heavy oil and slurry can be avoided due to the independent conveying and adjustment of the two slurry pumps.
In this embodiment, the first slurry flow rate detection unit 37, the second slurry flow rate detection unit 38, and the third slurry flow rate detection unit 39 are all coal slurry electromagnetic flowmeters, and the principle of "automatic return to zero" is applied to eliminate an electrochemical interference signal, so that zero point self-stabilization is achieved, no pressure loss is caused to liquid, and due to the special design of the structure, blockage caused by foreign matters can be prevented.
In this embodiment, the first slurry split flow, the second slurry split flow and the third slurry split flow are selected, and the slurry split flow in the middle is used as a slurry split flow medium value in the central oxygen slurry channel 15, because the coal slurry has a large viscosity and is easy to precipitate, three flow detection units are arranged for detection, and the medium value is obtained as a measurement value to improve the accuracy of obtaining the coal slurry flow, so that the measurement accuracy is prevented from being influenced by the effect of a viscous substance attached to an electrode by a certain measurement unit; in addition, the flow in a plurality of positions in the channel can be detected, and the phenomenon that the flow state in the pipeline is unstable and avalanche is generated is avoided.
In this embodiment, the fourth slurry flow rate detection unit 32, the fifth slurry flow rate detection unit 33, and the sixth slurry flow rate detection unit 34 are all coal slurry electromagnetic flowmeters.
In this embodiment, the fourth slurry split flow, the fifth slurry split flow and the sixth slurry split flow are selected, and the slurry split flow in the middle is used as the median of the slurry split flows in the epoxy slurry channel 16, because the coal slurry has high viscosity and is easy to precipitate, three flow detection units are provided for detection, and the median is obtained as a measured value to improve the accuracy of obtaining the coal slurry flow, so that the measurement accuracy is prevented from being affected by the action of a viscous substance attached to an electrode by a certain measurement unit; in addition, the flow in a plurality of positions in the channel can be detected, and the phenomenon that the flow state in the pipeline is unstable and avalanche is generated is avoided.
In this embodiment, the total oxygen volume flow rate detecting unit 2 is a venturi flow meter, the total oxygen temperature detecting unit 3 is an MCT80Y type temperature sensor, and the total oxygen pressure detecting unit 4 is an MC20B type pressure sensor.
In this embodiment, the high-pressure slurry master pump 29, the first high-pressure slurry pump 35, and the second high-pressure slurry pump 30 are piston type diaphragm pumps, such as those sold under the trade name Feluwa pump by shanghai comedy-commerce engineering equipment, ltd.
In this embodiment, the total motor 21, the first motor 36 and the second motor 31 are siemens 1LE0002 variable frequency motors.
In this embodiment, the controller 25 is a single chip, a PLC module, an ARM microcontroller, or a DSP microcontroller.
In this embodiment, the output end of the controller 25 is connected to a frequency converter for controlling the main motor 21, the first motor 36 and the second motor 31, and the frequency converter is a siemens frequency converter MicroMaster 440.
Example 2
In this example, the difference from example 1 is:
as shown in fig. 2, in this embodiment, the slurry flow rate detection module includes a first slurry flow rate detection unit 37, a second slurry flow rate detection unit 38, and a third slurry flow rate detection unit 39 that are disposed on the central oxygen slurry channel 15, and a fourth slurry flow rate detection unit 32, a fifth slurry flow rate detection unit 33, and a sixth slurry flow rate detection unit 34 that are disposed on the epoxy slurry channel 16;
the slurry conveying adjusting mechanism comprises a first high-pressure slurry pump 35 arranged on the central oxygen slurry channel 15, a first motor 36 driving the first high-pressure slurry pump 35, a second high-pressure slurry pump 30 arranged on the epoxy slurry channel 16 and a second motor 31 driving the second high-pressure slurry pump 30, the output ends of the first slurry flow rate detecting unit 37, the second slurry flow rate detecting unit 38, the third slurry flow rate detecting unit 39, the fourth slurry flow rate detecting unit 32, the fifth slurry flow rate detecting unit 33 and the sixth slurry flow rate detecting unit 34 are all connected with the controller 25, and the first motor 36 and the second motor 31 are controlled by the controller 25;
the specific process of obtaining the slurry total mass flow measurement value in step 101 is as follows:
step A, in the slurry conveying process, the first slurry flow rate detection unit 37, the second slurry flow rate detection unit 38 and the third slurry flow rate detection unit 39 respectively detect the slurry flow rates in the central oxygen slurry channel 15, and send the detected first slurry flow rate, second slurry flow rate and third slurry flow rate to the controller 25;
the fourth slurry flow rate detection unit 32, the fifth slurry flow rate detection unit 33, and the sixth slurry flow rate detection unit 34 respectively detect the slurry flow rate in the epoxy slurry channel 16, and send the detected fourth slurry flow rate, fifth slurry flow rate, and sixth slurry flow rate to the controller 25;
step B, the controller 25 adjusts a middle value selection module to select the first slurry flow rate, the second slurry flow rate and the third slurry flow rate, and the slurry flow rate in the middle is used as a slurry flow rate median value in the central oxygen slurry channel 15;
the controller 25 adjusts the intermediate value selection module to select the fourth slurry flow rate, the fifth slurry flow rate and the sixth slurry flow rate, and takes the slurry flow rate in the middle as the median of the slurry flow rate in the epoxy slurry channel 16;
and step C, the controller 25 obtains a slurry total mass flow measurement value according to the slurry flow rate median value in the central oxygen slurry channel 15 and the slurry flow rate median value in the epoxy slurry channel 16.
In this embodiment, the method further includes adjusting the slurry split flow rate, and the specific process is as follows:
the method comprises the following steps of (a) obtaining a slurry equivalent weight flow set value of a central oxygen slurry channel 15 and a slurry equivalent weight flow set value of an epoxy slurry channel 16 according to a slurry total mass flow set value; wherein, the setting value of the equivalent weight flow rate of the slurry of the central oxygen slurry channel 15 is 30-50% of the setting value of the total mass flow rate of the slurry, and the setting value of the equivalent weight flow rate of the slurry of the epoxy slurry channel 16 is 50-70% of the setting value of the total mass flow rate of the slurry;
step (II), the controller 25 compares the difference value of the slurry flow rate median value in the central oxygen slurry channel 15 with the slurry equivalent flow rate set value of the central oxygen slurry channel 15 to obtain a first slurry flow rate measured value deviation value, the controller 25 calls a PI adjusting module to process the first slurry flow rate measured value deviation value to obtain a first rotating speed control signal of a first motor 36 for controlling a first high-pressure slurry pump 35, and the controller 25 adjusts the rotating speed of the first motor 36 according to the first rotating speed control signal until the slurry flow rate median value in the central oxygen slurry channel 15 is maintained at the slurry equivalent flow rate set value of the central oxygen slurry channel 15;
meanwhile, the controller 25 compares the slurry flow rate median value in the epoxy slurry channel 16 with the slurry flow rate set value of the epoxy slurry channel 16 to obtain a second slurry flow rate measured value deviation value, the controller 25 calls a PI adjustment module to process the second slurry flow rate measured value deviation value to obtain a second rotating speed control signal for controlling the second motor 31 of the second high-pressure slurry pump 30, and the controller 25 adjusts the rotating speed of the second motor 31 according to the second rotating speed control signal until the slurry flow rate median value in the epoxy slurry channel 16 is maintained at the slurry flow rate set value of the epoxy slurry channel 16.
In this embodiment, the measurement value of the total mass flow of the slurry in step C is obtained as follows:
when both the central oxygen slurry channel 15 and the epoxy slurry channel 16 are coal slurry, the controller 25 sets the formula D to L1+L2Obtaining the measured value D, L of the total mass flow of the slurry1Represents the median value of the slurry split, L, in the central oxygen slurry channel 152Represents the median slurry split in the epoxy slurry channels 16;
when other hydrocarbon-containing materials are in the central oxygen slurry channel 15 and coal slurry is in the epoxy slurry channel 16, the controller 25 is set as the formula DA×L1+L2Obtaining a total mass flow measurement value D of the slurry; wherein a represents an equivalent transformation coefficient.
In this embodiment, the other hydrocarbon-containing material is coal tar, organic waste liquid, or heavy oil;
when the other hydrocarbon-containing material is coal tar, A is 2.12;
when the other hydrocarbon-containing materials are organic waste liquid, A is 1.12; the calorific value of the organic waste liquid is not less than 12000 kJ/kg;
when the other hydrocarbon-containing material is heavy oil, A is 2.25.
In this embodiment, the display screen 26 is provided to facilitate monitoring and checking of the flow rate; the alarm 27 is provided to warn of an abnormal state and to avoid the expansion of a failure.
In this embodiment, it is further preferable that the ratio of the total volume flow rate of oxygen to the total volume flow rate of slurry is 457.
In this embodiment, the slurry in the central oxygen slurry channel 15 is coal slurry, and the density of the coal slurry is 1220kg/m3(ii) a The slurry in the epoxy slurry channel 16 is coal slurry, and the density of the coal slurry is 1220kg/m3；
In this embodiment, it is further preferable that the oxygen flow rate set value of the central oxygen passage 7 is 10% of the total oxygen volume flow rate set value, the oxygen flow rate set value of the middle ring tube oxygen passage 6 is 35% of the total oxygen volume flow rate set value, the oxygen flow rate set value of the outer ring tube oxygen passage 5 is 55% of the total oxygen volume flow rate set value, and the oxygen flow rate set value of the central oxygen passage 7 is 7453 Nm/Nm3The oxygen split flow setting value of the middle ring pipe oxygen passage 6 is 26088Nm3The oxygen split flow setting value of the outer ring pipe oxygen passage 5 is 40994Nm3/h。
In this embodiment, it is further preferable that the slurry equivalent weight flow rate set value of the central oxygen slurry channel 15 is 30% of the total slurry mass flow rate set value, and the slurry flow rate set value of the epoxy slurry channel 16 is 70% of the total slurry mass flow rate set value; the slurry equivalent flow rate setting value of the central oxygen slurry channel 15 is 59643kg/h, and the slurry flow rate setting value of the epoxy slurry channel 16 is 139167 kg/h.
Example 3
In this example, the difference from example 2 is:
in this embodiment, it is further preferable that the ratio of the total volume flow rate of oxygen to the total volume flow rate of slurry is 471.
In this embodiment, the slurry in the central oxygen slurry channel 15 is coal slurry, and the density of the coal slurry is 1220kg/m3(ii) a The slurry in the epoxy slurry channel 16 is coal slurry, and the density of the coal slurry is 1220kg/m3；
In this embodiment, it is further preferable that the oxygen flow rate set value of the central oxygen passage 7 is 8% of the total oxygen volume flow rate set value, the oxygen flow rate set value of the middle ring pipe oxygen passage 6 is 40% of the total oxygen volume flow rate set value, the oxygen flow rate set value of the outer ring pipe oxygen passage 5 is 52% of the total oxygen volume flow rate set value, and the oxygen flow rate set value of the central oxygen passage 7 is 5963Nm3The oxygen flow rate of the middle ring pipe oxygen channel 6 is 29814Nm3The oxygen split flow setting value of the outer ring pipe oxygen passage 5 is 38760Nm3/h。
In this embodiment, it is further preferable that the slurry equivalent weight flow rate set value of the central oxygen slurry channel 15 is 50% of the total slurry mass flow rate set value, and the slurry flow rate set value of the epoxy slurry channel 16 is 50% of the total slurry mass flow rate set value; the slurry equivalent flow rate setting value of the central oxygen slurry channel 15 is 96147kg/h, and the slurry flow rate setting value of the epoxy slurry channel 16 is 96147 kg/h.
In this example, the other method steps are the same as in example 2.
Example 4
In this example, the difference from example 2 is:
in this embodiment, it is further preferable that the ratio of the total volume flow rate of oxygen to the total volume flow rate of slurry is 457.
In this embodiment, it should be noted that the total volume flow of the slurry is a ratio of the total mass flow of the slurry to the density of the slurry; when other hydrocarbon-containing materials are in the central oxygen slurry channel 15, the material flow needs to be converted into coal slurry equivalent flow.
In this embodiment, it is further preferable that the oxygen flow rate set value of the central oxygen passage 7 is 5% of the total oxygen volume flow rate set value, the oxygen flow rate set value of the middle ring tube oxygen passage 6 is 45% of the total oxygen volume flow rate set value, the oxygen flow rate set value of the outer ring tube oxygen passage 5 is 50% of the total oxygen volume flow rate set value, and the oxygen flow rate set value of the central oxygen passage 7 is 3727Nm3The oxygen flow rate of the middle ring pipe oxygen channel 6 is 33542Nm3The oxygen split flow setting value of the outer ring pipe oxygen passage 5 is 37268Nm3/h。
In this embodiment, the slurry in the central oxygen slurry channel 15 is coal tar, and the density of the coal tar is 1.13g/cm3(ii) a The slurry in the epoxy slurry channel 16 is coal slurry, and the density of the coal slurry is 1220kg/m3(ii) a In the actual use process, the density of the coal tar can be 1.13g/cm3～1.22g/cm3And (5) adjusting within the range.
In this embodiment, it is further preferable that the coal slurry equivalent flow rate setting value of the central oxygen slurry channel 15 is 30% of the slurry total mass flow rate setting value, and the slurry flow rate setting value of the epoxy slurry channel 16 is 70% of the slurry total mass flow rate setting value; the coal tar flow rate set value of the central oxygen slurry channel 15 is 28182kg/h, the coal tar flow rate set value of the central oxygen slurry channel 15 is converted into the coal slurry equivalent flow rate set value of 59695kg/h of the central oxygen slurry channel 15, and the slurry flow rate set value of the epoxy slurry channel 16 is 139288 kg/h.
In this example, the other method steps are the same as in example 2.
Example 5
In this example, the difference from example 2 is:
in this embodiment, it is further preferable that the ratio of the total volume flow rate of oxygen to the total volume flow rate of slurry is 472.
In this embodiment, it is further preferable that the oxygen partial flow rate setting value of the central oxygen passage 7 is oxygenThe set value of the total volume flow of the gas is 5 percent, the set value of the oxygen flow rate of the middle ring pipe oxygen passage 6 is 35 percent of the set value of the total volume flow of the oxygen, the set value of the oxygen flow rate of the outer ring pipe oxygen passage 5 is 60 percent of the set value of the total volume flow of the oxygen, and the set value of the oxygen flow rate of the central oxygen passage 7 is 3727Nm3The oxygen split flow setting value of the middle ring pipe oxygen passage 6 is 26088Nm3The oxygen split flow set value of the outer ring pipe oxygen channel 5 is 44723Nm3/h。
In this embodiment, the slurry in the central oxygen slurry channel 15 is organic waste liquid, and the density of the organic waste liquid is 1.05 kg/L; the slurry in the epoxy slurry channel 16 is coal slurry, and the density of the coal slurry is 1220kg/m3。
In this embodiment, it is further preferable that the coal slurry equivalent flow rate setting value of the central oxygen slurry channel 15 is 40% of the slurry total mass flow rate setting value, and the slurry flow rate setting value of the epoxy slurry channel 16 is 60% of the slurry total mass flow rate setting value; the set value of the organic waste liquid flow of the central oxygen slurry channel 15 is 68694kg/h, the set value of the organic waste liquid flow of the central oxygen slurry channel 15 is converted into the set value of the coal slurry equivalent flow of the central oxygen slurry channel 15, which is 77065kg/h, and the set value of the slurry flow of the epoxy slurry channel 16 is 115597 kg/h.
In this example, the other method steps are the same as in example 2.
Example 6
In this example, the difference from example 2 is:
in this embodiment, it is further preferable that the ratio of the total volume flow rate of oxygen to the total volume flow rate of slurry is 450.
In this embodiment, it is further preferable that the oxygen flow rate set value of the central oxygen passage 7 is 10% of the total oxygen volume flow rate set value, the oxygen flow rate set value of the middle ring pipe oxygen passage 6 is 45% of the total oxygen volume flow rate set value, the oxygen flow rate set value of the outer ring pipe oxygen passage 5 is 45% of the total oxygen volume flow rate set value, and the oxygen flow rate set value of the central oxygen passage 7 is 7453 Nm/Nm3The oxygen flow rate of the oxygen channel 6 of the middle ring pipe is set as33542Nm3The oxygen split flow setting value of the outer ring pipe oxygen passage 5 is 33542Nm3/h。
In this embodiment, the slurry in the central oxygen slurry channel 15 is heavy oil, and the density of the heavy oil is 0.82g/cm3(ii) a The slurry in the epoxy slurry channel 16 is coal slurry, and the density of the coal slurry is 1220kg/m3. In practical use, the density of the heavy oil can be 0.82g/cm3～0.95g/cm3And (5) adjusting within the range.
In this embodiment, it is further preferable that the coal slurry equivalent flow rate setting value of the central oxygen slurry channel 15 is 35% of the slurry total mass flow rate setting value, and the slurry flow rate setting value of the epoxy slurry channel 16 is 65% of the slurry total mass flow rate setting value; the set value of the heavy oil flow rate of the central oxygen slurry channel 15 is 31492kg/h, the set value of the heavy oil flow rate of the central oxygen slurry channel 15 is converted into the set value of the coal slurry equivalent flow rate of the central oxygen slurry channel 15 of 70727kg/h, and the set value of the slurry flow rate of the epoxy slurry channel 16 is 131351 kg/h.
In this example, the other method steps are the same as in example 2.
In conclusion, the method has the advantages of simple steps, reasonable design, convenience in implementation and good use effect, the slurry flow can be enlarged by 1.2-2 times compared with single-channel slurry feeding, the atomization is more uniform, and the combustion is more sufficient; in addition, slurry feeding can be diversified, other materials containing carbon and hydrogen except coal slurry are used as the pulping raw materials for reutilization, the environment is protected, the problems of uneven mixing, unsmooth conveying and the like caused by common pulping with the coal slurry are avoided, and the practicability is high.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims (5)

1. A method for controlling the feeding of slurry and oxygen to multi-channel nozzle includes such steps as providing a multi-channel nozzle and a control module, the multi-channel nozzle comprises a nozzle (14), a slurry conveying mechanism and an oxygen conveying mechanism which are arranged on the nozzle (14), the slurry conveying mechanism comprises a slurry channel, a slurry flow detection module and a slurry conveying adjusting mechanism, the slurry channels comprise a central oxygen slurry channel (15) and an epoxy slurry channel (16), the slurry flow detection module comprises a first slurry flow detection unit (37), a second slurry flow detection unit (38), a third slurry flow detection unit (39) arranged on the central oxygen slurry channel (15), and a fourth slurry flow detection unit (32), a fifth slurry flow detection unit (33) and a sixth slurry flow detection unit (34) arranged on the epoxy slurry channel (16); the slurry conveying and adjusting mechanism comprises a first high-pressure slurry pump (35) arranged on the central oxygen slurry channel (15), a first motor (36) for driving the first high-pressure slurry pump (35), a second high-pressure slurry pump (30) arranged on the epoxy slurry channel (16) and a second motor (31) for driving the second high-pressure slurry pump (30), wherein the output ends of the first slurry flow rate detection unit (37), the second slurry flow rate detection unit (38), the third slurry flow rate detection unit (39), the fourth slurry flow rate detection unit (32), the fifth slurry flow rate detection unit (33) and the sixth slurry flow rate detection unit (34) are all connected with the controller (25), and the first motor (36) and the second motor (31) are controlled by the controller (25);
or the input ends of the central oxygen slurry channel (15) and the epoxy slurry channel (16) are connected with a total slurry channel (20), the slurry flow rate detection module comprises a first total slurry flow rate detection unit (19), a second total slurry flow rate detection unit (18) and a third total slurry flow rate detection unit (17) which are arranged on the total slurry channel (20), the slurry conveying and adjusting mechanism comprises a high-pressure total slurry pump (29) arranged on the total slurry channel (20) and a total motor (21) for driving the high-pressure total slurry pump (29), the output ends of the first total slurry flow rate detection unit (19), the second total slurry flow rate detection unit (18) and the third total slurry flow rate detection unit (17) are all connected with a controller (25), and the total motor (21) is controlled by the controller (25);
the oxygen conveying mechanism comprises a central oxygen channel (7), a middle ring pipe oxygen channel (6) and an outer ring pipe oxygen channel (5), wherein the central oxygen channel (7), the middle ring pipe oxygen channel (6) and the outer ring pipe oxygen channel (5) are connected with the oxygen main channel (1), the control module comprises a controller (25), a display screen (26) and an alarm (27) which are connected with the controller (25), a first regulating valve (13) and a first oxygen partial flow detection unit (8) are arranged on the central oxygen channel (7), a second regulating valve (12) and a second oxygen partial flow detection unit (9) are arranged on the middle ring pipe oxygen channel (6), a third regulating valve (11) and a third oxygen partial flow detection unit (10) are arranged on the outer ring pipe oxygen channel (5), an oxygen total volume flow detection unit (2), an oxygen total temperature detection unit (3) and an oxygen total pressure detection unit (4) are arranged on the oxygen main channel (1), the slurry flow detection device is characterized by comprising a slurry flow detection module, a first oxygen partial flow detection unit (8), a second oxygen partial flow detection unit (9), a third oxygen partial flow detection unit (10), an oxygen total volume flow detection unit (2), an oxygen total temperature detection unit (3) and an oxygen total pressure detection unit (4), wherein the output ends of the slurry flow detection module, the first oxygen partial flow detection unit, the third oxygen partial flow detection unit, the oxygen total volume flow detection unit, the oxygen total temperature detection unit and the oxygen total pressure detection unit are all connected with a controller (25), and a slurry conveying and adjusting mechanism, a first adjusting valve (13), a second adjusting valve (12) and a third adjusting valve (11) are all controlled by the controller (:
step one, acquisition and transmission of detection data:
step 101, in the slurry conveying process, the slurry flow detection module detects the total mass flow of the slurry in the slurry channel and sends the detected total mass flow measurement value of the slurry to a controller (25);
the specific process of obtaining the slurry total mass flow measurement value in step 101 is as follows:
step A, in the slurry conveying process, a first slurry flow rate detection unit (37), a second slurry flow rate detection unit (38) and a third slurry flow rate detection unit (39) respectively detect the slurry flow rate in a central oxygen slurry channel (15), and send the detected first slurry flow rate, second slurry flow rate and third slurry flow rate to a controller (25);
a fourth slurry flow rate detection unit (32), a fifth slurry flow rate detection unit (33) and a sixth slurry flow rate detection unit (34) respectively detect the slurry flow rate in the epoxy slurry channel (16), and send the detected fourth slurry flow rate, fifth slurry flow rate and sixth slurry flow rate to a controller (25);
step B, the controller (25) adjusts a middle value selection module, selects the first slurry flow rate, the second slurry flow rate and the third slurry flow rate, and takes the slurry flow rate in the middle as a slurry flow rate median value in the central oxygen slurry channel (15);
the controller (25) adjusts the intermediate value selection module, selects the fourth slurry flow rate, the fifth slurry flow rate and the sixth slurry flow rate, and takes the slurry flow rate in the middle as the slurry flow rate median value in the epoxy slurry channel (16);
c, obtaining a total mass flow measurement value of the slurry by the controller (25) according to the slurry flow split median value in the central oxygen slurry channel (15) and the slurry flow split median value in the epoxy slurry channel (16);
or the specific process of obtaining the slurry total mass flow measurement value in the step 101 is as follows:
step 1011, in the slurry conveying process, the first slurry total flow rate detection unit (19), the second slurry total flow rate detection unit (18) and the third slurry total flow rate detection unit (17) respectively detect the total mass flow rate of the slurry in the slurry total channel (20), and send the detected first slurry total mass flow rate, second slurry total mass flow rate and third slurry total mass flow rate to the controller (25);
step 1012, the controller (25) adjusts an intermediate value selection module, selects the total mass flow of the first slurry, the total mass flow of the second slurry and the total mass flow of the third slurry, and takes the total mass flow of the intermediate slurry as a measured value of the total mass flow of the slurry;
102, in the oxygen conveying process, detecting the total volume flow of oxygen in an oxygen main channel (1) by an oxygen total volume flow detecting unit (2), sending the detected total volume flow of the oxygen to a controller (25), detecting the total temperature of the oxygen in the oxygen main channel (1) by an oxygen total temperature detecting unit (3), sending the detected total temperature of the oxygen to the controller (25), detecting the total pressure of the oxygen in the oxygen main channel (1) by an oxygen total pressure detecting unit (4), and sending the detected total pressure of the oxygen to the controller (25);
step two, data processing and control of the slurry main channel and the oxygen main channel:
step 201, the controller (25) according to a formula
Figure FDA0002755612480000031
Obtaining the total volume flow compensation value F of oxygeny(ii) a Wherein, PiRepresents the total oxygen pressure detected by the total oxygen pressure detection unit (4), TiIndicates the total oxygen temperature, P, detected by the total oxygen temperature detecting unit (3)bIndicating the compensated reference pressure, TbRepresents a compensated reference temperature;
step 202, the controller (25) according to formula Fc＝FyX alpha to obtain the measured value F of the total volume flow of the oxygenc(ii) a Wherein α represents the volume purity of oxygen;
step 203, the controller (25) calls a difference value comparator to compare the difference value of the received slurry total mass flow measured value with a slurry total mass flow set value to obtain a slurry deviation value, and the controller (25) calls a PI (proportional integral) adjusting module to process the slurry deviation value and adjust the conveying flow of the slurry conveying adjusting mechanism until the slurry total mass flow detected value is maintained at the slurry total mass flow set value;
at the same time, the controller (25) retrieves a difference comparator of the received oxygen total volumetric flow measurements FcThe difference value of the total oxygen flow rate and the total oxygen flow rate set value is compared to obtain an oxygen deviation value, the controller (25) calls a PI adjusting module to process the oxygen deviation value to obtain the opening degree of the total oxygen control valve (23) until the measured value of the total oxygen flow rate is maintained at the set value of the total oxygen flow rate;
step three, controlling the flow of the slurry sub-channel and the oxygen sub-channel:
the flow control of the oxygen subchannel comprises the following steps:
301, obtaining an oxygen flow dividing set value of the central oxygen channel (7), an oxygen flow dividing set value of the middle ring pipe oxygen channel (6) and an oxygen flow dividing set value of the outer ring pipe oxygen channel (5) according to the oxygen total volume flow set value; wherein the oxygen flow rate set value of the central oxygen channel (7) is 5-10% of the oxygen total volume flow rate set value, the oxygen flow rate set value of the middle ring pipe oxygen channel (6) is 35-45% of the oxygen total volume flow rate set value, and the oxygen flow rate set value of the outer ring pipe oxygen channel (5) is 45-60% of the oxygen total volume flow rate set value;
step 302, in the process of delivering oxygen, a first oxygen partial flow detection unit (8) detects the flow in a central oxygen passage (7) and sends the measured first oxygen partial flow measurement value to a controller (25), a second oxygen partial flow detection unit (9) detects the flow in a central loop oxygen passage (6) and sends the measured second oxygen partial flow measurement value to the controller (25), a third oxygen partial flow detection unit (10) detects the flow in an outer loop oxygen passage (5) and sends the measured third oxygen partial flow measurement value to the controller (25);
step 303, the controller (25) calls a difference value comparator to compare a difference value between a received first oxygen partial flow measurement value and an oxygen partial flow set value of the central oxygen channel (7) to obtain a first oxygen partial flow deviation value, and the controller (25) calls a PI (proportional integral) regulating module to process the first oxygen partial flow measurement value deviation value to obtain the opening degree of the first regulating valve (13) until the first oxygen partial flow measurement value is maintained at the oxygen partial flow set value of the central oxygen channel (7);
the controller (25) calls a difference value comparator to compare a received second oxygen partial flow measurement value with an oxygen partial flow set value of the middle ring pipe oxygen channel (6) to obtain a second oxygen partial flow deviation value, and the controller (25) calls a PI adjusting module to process the second oxygen partial flow measurement value deviation value to obtain the opening degree of a second adjusting valve (12) until the second oxygen partial flow measurement value is maintained at the oxygen partial flow set value of the middle ring pipe oxygen channel (6);
the controller (25) calls a difference value comparator to carry out difference value comparison on a received third oxygen flow rate measured value and an oxygen flow rate set value of the outer ring pipe oxygen channel (5) to obtain a third oxygen flow rate deviation value, and the controller (25) calls a PI adjusting module to process the third oxygen flow rate measured value deviation value to obtain the opening degree of a third adjusting valve (11) until the third oxygen flow rate measured value is maintained at the oxygen flow rate set value of the outer ring pipe oxygen channel (5);
the flow control of the slurry subchannels comprises the following steps:
the method comprises the following steps of (a) obtaining a slurry equivalent weight flow rate set value of a central oxygen slurry channel (15) and a slurry flow rate set value of an epoxy slurry channel (16) according to a slurry total mass flow rate set value; wherein the slurry equivalent weight flow rate set value of the central oxygen slurry channel (15) is 30-50% of the total slurry mass flow rate set value, and the slurry flow rate set value of the epoxy slurry channel (16) is 50-70% of the total slurry mass flow rate set value;
step two, the controller (25) compares the difference value of the slurry flow rate median value in the central oxygen slurry channel (15) with the slurry equivalent flow rate set value of the central oxygen slurry channel (15) to obtain a first slurry flow rate measured value deviation value, the controller (25) calls a PI adjusting module to process the first slurry flow rate measured value deviation value to obtain a first rotating speed control signal of a first motor (36) for controlling a first high-pressure slurry pump (35), and the controller (25) adjusts the rotating speed of the first motor (36) according to the first rotating speed control signal until the slurry flow rate median value in the central oxygen slurry channel (15) is maintained at the slurry equivalent flow rate set value of the central oxygen slurry channel (15);
meanwhile, the controller (25) compares the slurry flow rate median value in the epoxy slurry channel (16) with the slurry flow rate set value of the epoxy slurry channel (16) to obtain a second slurry flow rate measured value deviation value, the controller (25) calls a PI adjusting module to process the second slurry flow rate measured value deviation value to obtain a second rotating speed control signal of a second motor (31) for controlling a second high-pressure slurry pump (30), and the controller (25) adjusts the rotating speed of the second motor (31) according to the second rotating speed control signal until the slurry flow rate median value in the epoxy slurry channel (16) is maintained at the slurry flow rate set value of the epoxy slurry channel (16).
2. A method of slurry and oxygen feed control for a multi-channel nozzle as claimed in claim 1, wherein: the process of obtaining the total slurry mass flow set value and the total oxygen volume flow set value in step 203 is as follows:
step 2031, setting the load value of the total volume flow of oxygen, the load value of the total mass flow of slurry and the ratio of the total volume flow of oxygen to the total volume flow of slurry;
step 2032, the controller (25) calls a division module, and inputs the ratio of the total volume flow of oxygen to the total volume flow of the slurry and the measured value of the total volume flow of oxygen to obtain a calculated value of the total volume flow of the slurry; the controller (25) calls the division module and inputs the measured value of the total mass flow of the slurry and the density of the slurry to obtain the measured value of the total volume flow of the slurry; the controller (25) calls the multiplication module and inputs the ratio of the total volume flow of the oxygen to the total volume flow of the slurry and the measured value of the total volume flow of the slurry to obtain a calculated value of the total volume flow of the oxygen;
step 2033, the controller (25) calls out a division module, and inputs the total slurry mass flow load value and the slurry density to obtain the total slurry volume flow load value;
step 2034, the controller (25) calls a high value selection module, and selects a high value from the calculated value of the total volume flow of the slurry and the load value of the total volume flow of the slurry as a set value of the total volume flow of the slurry; the controller (25) calls the multiplication module and inputs a slurry total volume flow set value and a slurry density to obtain a slurry total mass flow set value; the controller (25) calls a low value selection module, and selects a low value from the calculated oxygen total volume flow value and the load value of the oxygen total volume flow as a set value of the oxygen total volume flow.
3. A method of slurry and oxygen feed control for a multi-channel nozzle as claimed in claim 1, wherein: the controller (25) calls the PI adjusting module to process the slurry deviation value, adjusts the conveying flow of the slurry conveying adjusting mechanism until the slurry total mass flow detection value is maintained at the slurry total mass flow set value, and the specific process is as follows:
the controller (25) calls the PI adjusting module to process the slurry deviation value to obtain a total motor rotating speed control signal of a total motor (21) for controlling the high-pressure slurry master pump (29), and the controller (25) adjusts the rotating speed of the total motor (21) according to the total motor rotating speed control signal until the slurry total mass flow detection value is maintained at the slurry total mass flow set value.
4. A method of slurry and oxygen feed control for a multi-channel nozzle as claimed in claim 1, wherein: and C, obtaining the measured value of the total mass flow of the slurry in the step C as follows:
when the central oxygen slurry channel (15) and the epoxy slurry channel (16) are both coal slurry, the controller (25) sets the L as the formula D1+L2Obtaining the measured value D, L of the total mass flow of the slurry1Represents the median value of the flow rate of the slurry in the central oxygen slurry channel (15), L2Representing a median slurry split in the epoxy slurry channels (16);
when other hydrocarbon-containing materials are in the central oxygen slurry channel (15) and coal slurry is in the epoxy slurry channel (16), the controller (25) is AxL according to the formula D1+L2Obtaining a total mass flow measurement value D of the slurry; wherein a represents an equivalent transformation coefficient.
5. A method of slurry and oxygen feed control for a multi-channel nozzle as claimed in claim 4, wherein: the other hydrocarbon-containing materials are coal tar, organic waste liquid or heavy oil;
when the other hydrocarbon-containing material is coal tar, A is 2.12;
when the other hydrocarbon-containing materials are organic waste liquid, A is 1.12; wherein the calorific value of the organic waste liquid is not less than 12000 kJ/kg;
when the other hydrocarbon-containing material is heavy oil, A is 2.25.
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