CN108753362B - Method and system for controlling start/stop of clean pulverized coal gasification device for treating wastewater - Google Patents
Method and system for controlling start/stop of clean pulverized coal gasification device for treating wastewater Download PDFInfo
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- CN108753362B CN108753362B CN201810652765.1A CN201810652765A CN108753362B CN 108753362 B CN108753362 B CN 108753362B CN 201810652765 A CN201810652765 A CN 201810652765A CN 108753362 B CN108753362 B CN 108753362B
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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
- C10J3/72—Other features
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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
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Abstract
The invention provides an on/off control method and a system for a clean pulverized coal gasification device for treating wastewater, wherein the method comprises the steps of 1) airtight leak test and replacement, and three steps of lifting/lowering and replacement are carried out on the gasification device; 2) Ignition, wherein ignition air and ignition fuel gas are introduced into a control valve for ignition; 3) Boosting, namely, introducing boosted oxygen and boosted fuel gas by a control valve; 4) Feeding coal, and controlling a valve to feed oxygen and pulverized coal into a gasification furnace system for combustion; 5) Waste water is thrown into the gasification furnace for combustion by the control valve; 6) Air guide, controlling valve to heat pipe and feed air; 7) And stopping, opening a purging and replacing valve, and stopping purging, replacing and cooling the system. The air ignition is used, the safety coefficient of the operation control process is high, and the operation is simple and reliable; the air tightness test and replacement are carried out simultaneously, so that the efficiency is high, and the cost is saved; the device is put into the waste water, is safe and environment-friendly, and saves cost.
Description
Technical Field
The invention belongs to the technical field of pulverized coal gasification, and particularly relates to an on/off control method and system of a clean pulverized coal gasification device for treating wastewater.
Background
The powdered coal gasifying technology for treating waste water features that powdered coal ground by coal mill is pressurized and conveyed to gasifying furnace to produce gasifying reaction with pure oxygen and waste water in the furnace to produce coarse synthetic gas. The technology of mixing and burning high-concentration organic wastewater by the composite gasification device can thoroughly solve the problem that the high-concentration organic wastewater is difficult to treat on the one hand, and can realize the recycling of the high-concentration organic wastewater of coal chemical enterprises on the other hand.
The starting and stopping of the pulverized coal gasification device means that the whole operation process of the device comprises the start and the end, and a certain danger exists in the combustible and explosive gas existing in the system after the operation of the pulverized coal gasification device is finished; oxygen, air and fuel gas are introduced into the gasification furnace for combustion, so that the safety of the pulverized coal gasification device needs to be controlled in the operation process. The conventional pulverized coal gasification device control method and system are complicated, the sequential control logic is complex, the investment cost is high, and the driving time is long.
Disclosure of Invention
In view of the above problems in the prior art, it is an object of the present invention to provide a control method of a clean pulverized coal gasification apparatus for treating wastewater. The air tightness test and replacement are carried out simultaneously, the air existing in the replacement system is changed into an inert gas environment, and the safety of ignition feeding is improved; the valve is controlled by the sequence control program, the air and the fuel gas are used for ignition, the oxygen and the fuel gas are used for heating and boosting, the safety coefficient of the operation process is high, and the operation is simple and reliable.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a control method of a clean pulverized coal gasification device for treating wastewater comprises the following steps: the method comprises the following specific steps:
1) Air-tight leakage test and replacement
The clean pulverized coal gasification device for treating the wastewater is pressurized to the airtight test pressure by using inert gas, the pressurization and depressurization are repeated for three times, the pressure relief replacement is carried out after the airtight test is qualified, the system is changed into the inert gas environment, and the safety during ignition and feeding is improved;
2) Ignition of
Before the program control valve leads air and fuel gas to the burner, after the airtight leakage test and replacement of the step 1 are finished, executing an ignition command, and opening the ignition air valve and the fuel gas valve under program control to ignite and ignite;
3) Boosting of pressure
After the ignition execution of the step 2 is completed, the procedure opens a boosting oxygen valve and a fuel valve to boost the system to 0.9-4.0Mpa;
4) Coal feeding
After the step 3 is completed, the program opens the main oxygen valve and the pulverized coal valve, and puts oxygen and pulverized coal into the system, and the pressure of the system is controlled to be increased to 3.5-4.0MPa;
5) Throwing waste water
After the coal feeding is finished, executing a wastewater feeding command, opening a wastewater valve of a combustor, and feeding wastewater into the gasifier through a wastewater channel of the combustor for combustion;
6) Air guide
After the wastewater is completely fed, executing an air guide command, opening a bypass of an outward-feeding valve to replace a heating pipe, opening the outward-feeding valve after a preset time is reached, closing an emptying valve, and feeding the crude synthetic gas to a rear system;
7) Parking
Executing a parking command, closing a main oxygen valve, a pulverized coal valve and a crude synthesis gas outward-feeding valve, opening a crude synthesis gas emptying valve, opening a purging and replacing air valve, and performing parking purging, replacement and cooling on the system to ensure safe parking of the system.
The specific steps of the step 1) are as follows:
(1) The system of the clean pulverized coal gasification device for treating wastewater is isolated, a system valve after crude synthesis gas is removed is closed, a crude synthesis gas emptying valve is closed, a burner inlet blowing and replacing valve is opened, the system is switched to a boosting mode, and the burner inlet blowing and replacing valve is closed after boosting to a preset value for performing a first air tightness test;
(2) Opening the crude synthesis gas emptying valve, switching to a 'depressurization mode', and depressurizing to a preset value to complete a first air tightness test; performing a second and third airtight test according to the same steps;
(3) After the third airtight test is completed, triggering the signal of the completion of the step 1).
In the step 1) of the application, the purging replacement and the airtight test process are performed simultaneously, no vacuumizing operation is performed, and the ignition step can be performed after the purging replacement is completed.
The specific steps of the step 2) are as follows:
(1) Opening a first air and fuel gas valve, and introducing air and fuel gas for ignition into front of a burner valve;
(2) Opening a large ejector valve, closing a coarse synthesis gas delivery valve and a coarse synthesis gas emptying valve, and maintaining a system micro negative pressure state;
(3) After the step 1 is completed and the signal is triggered, an ignition command is executed, a second ignition air valve and an ignition fuel gas valve are opened to perform ignition, and a signal of ignition success is triggered after flame combustion is detected.
The application utilizes air to ignite, so that the safety is improved.
The specific steps of the step 3) are as follows:
(1) Confirming the closing state of the purging replacement valve;
(2) Opening a second step-up fuel gas valve and a second step-up oxygen gas valve to a preset opening degree, and starting step-up by the system;
(3) After reaching the preset time, closing the second ignition air valve, the second ignition fuel air valve and the ejector valve;
(4) And automatically controlling the opening of a crude synthesis gas vent valve, maintaining the pressure increasing rate to be 0.05MPa/min, and increasing the pressure to a set value.
The specific steps of the step 4) are as follows:
(1) Opening a main oxygen valve and a pulverized coal valve, and throwing oxygen and pulverized coal into the system;
(2) After the preset time is reached, closing a second boost oxygen valve and a second boost fuel valve;
(3) Automatically controlling the opening of a crude synthesis gas vent valve, maintaining the pressure increasing rate to be 0.05MPa/min, and increasing the pressure to a set value (3.5-4.0 MPa).
The specific steps of the step 5) are as follows:
(1) Opening a first waste water valve, and introducing waste water into the front of the burner valve;
(2) After the system pressure reaches a preset value, a wastewater input command is executed, a second wastewater valve is opened, and wastewater is input into the burner.
The specific steps of the step 6 are as follows:
(1) After the system pressure reaches a preset value, executing an air guide command, opening an external rough synthesis gas valve bypass, and heating, replacing and pressurizing a pipeline behind the valve;
(2) After the preset time is reached, an outward-feeding raw synthesis gas valve is opened, a bypass valve is closed, and raw synthesis gas is sent out of the system.
The specific steps of the step 7 are as follows:
(1) Executing a parking command or interlocking triggering parking command, and closing a second main oxygen valve, a pulverized coal valve, a coarse synthesis gas delivery valve and a second waste water valve;
(2) And (3) opening a crude synthesis gas vent valve, opening each purging and replacing valve, and stopping purging, replacing, cooling and decompressing the system.
The pulverized coal gasification device operation process of this application is simple, and pulverized coal gasification device sweeps and ignites after the replacement finishes among the prior art, still need sweep the replacement behind the firing procedure, and program logic is chaotic, and this application utilizes the air to ignite has improved the security, has simplified the operation procedure, utilizes pulverized coal gasification device to handle waste water simultaneously.
Before the first valve introduces the air and fuel gas for ignition into the corresponding valves, after the main controller executes an ignition command, the second valve is opened for ignition, and the gas in front of the valves is put into the gasifier, so that the respective control function can be achieved, and meanwhile, the risk of pouring high-temperature gas of the gasifier back to the pipeline during normal operation is effectively reduced due to the arrangement of the double valves.
The second object of the invention is to provide a clean pulverized coal gasification system for treating wastewater, which comprises a gasification furnace, a pulverized coal pipeline, an oxygen pipeline, a fuel gas pipeline, a slag lock hopper, a synthetic gas washing device, an injection device, an emptying device and an outward feeding device; the gasification furnace is vertically arranged, a burner at the top of the gasification furnace is provided with three openings, namely an oxygen opening, a pulverized coal opening and a fuel gas opening, the oxygen opening is connected with an oxygen pipeline, and four branch pipelines, namely an ignition air pipeline, a boosting oxygen pipeline, a main oxygen pipeline and an oxygen purging pipeline, are arranged on the oxygen pipeline; the pulverized coal opening is connected with a pulverized coal pipeline, and the pulverized coal pipeline is provided with two branch pipelines which are a pulverized coal purging pipeline and a main pulverized coal pipeline respectively; the fuel gas opening is connected with a fuel gas pipeline, and the fuel gas pipeline is provided with four branch pipelines which are a fuel gas purging pipeline, a boosting fuel gas pipeline, an ignition fuel gas pipeline and a waste water pipeline respectively; the middle part of the gasification furnace is respectively connected with the synthesis gas washing device and the injection device through a synthesis gas outlet pipeline; the top of the synthetic gas washing device is respectively connected with the emptying device and the outward feeding device through a crude synthetic gas outward feeding pipeline, the bottom of the synthetic gas washing device is connected with the gasification furnace through a chilling water pipeline, and the bottom of the gasification furnace is connected with the slag lock hopper.
Preferably, the synthetic gas washing device comprises a venturi scrubber, a washing tower, a chilled water pump and a chilled water filter, wherein a synthetic gas outlet pipeline is connected with the venturi scrubber, the venturi scrubber is connected with the washing tower, a chilled water outlet at the bottom of the washing tower is connected with the chilled water pump, an outlet of the chilled water pump is connected with the chilled water filter, and the chilled water filter is connected with the gasifier.
Preferably, the extractor comprises an extractor, an extractor separating tank and an extractor steam valve, a branch pipeline of the synthetic gas outlet pipeline is connected with the extractor, a steam inlet of the extractor is connected with the extractor steam valve, an outlet of the extractor is connected with the extractor separating tank, and the extractor valve is arranged on the branch pipeline of the synthetic gas outlet pipeline.
Preferably, the emptying device comprises an emptying pipeline, and a raw synthesis gas emptying valve is arranged on the emptying pipeline.
Preferably, the external sending device comprises a crude synthesis gas external sending valve and a crude synthesis gas external sending bypass valve, wherein a crude synthesis gas external sending pipeline is respectively connected with pipelines where the crude synthesis gas external sending valve and the crude synthesis gas external sending bypass valve are positioned, and the pipelines where the crude synthesis gas external sending valve and the crude synthesis gas external sending bypass valve are positioned are converged and then connected with a rear system, and the rear system is a crude synthesis gas further processing system outside a boundary zone.
Preferably, a first slag discharging valve and a second slag discharging valve are arranged on a pipeline connected with the gasification furnace and the slag lock hopper; a slag valve of the slag lock hopper is arranged on a pipeline below the slag lock hopper.
Preferably, valves are provided on the pulverized coal conveying pipeline, the pulverized coal purging pipeline, the oxygen purging pipeline, the fuel gas purging pipeline, the ignition air pipeline, the booster oxygen pipeline, the main oxygen pipeline, the booster fuel gas pipeline, the ignition fuel gas pipeline and the waste water pipeline.
The utility model provides a pulverized coal gasification system's simple structure, nozzle are connected respectively to each pipeline, and the raw materials of throwing into the gasifier are connected respectively to each pipeline, and every pipeline can both be controlled respectively, and every pipeline advances the material differently, sets up three opening on the nozzle and connects each main pipeline respectively, and each minute pipeline is connected to the main pipeline, and the pulverized coal gasification system structure of this application is clear, and the operation process is simple.
The invention has the beneficial effects that:
(1) The on/off control method and the system of the invention use air for ignition, have high safety coefficient in the operation control process and are simple and reliable in operation;
(2) The system of the invention performs air tightness test and replacement simultaneously, has high efficiency and saves cost;
(3) The system comprises a wastewater input device, is safe and environment-friendly, and saves cost.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application.
FIG. 1 is an exemplary flow chart of a clean-type pulverized coal gasification unit on/off control process for treating wastewater;
FIG. 2 is a schematic diagram of a clean pulverized coal gasification plant on/off control system for treating wastewater;
FIG. 3 is a control connection diagram of a controller of a clean pulverized coal gasification unit for treating wastewater;
wherein:
fig. 1 is: 1. air-tight leakage test and replacement; 2. igniting; 3. boosting; 4. coal feeding; 5. waste water is thrown; 6. guiding air; 7. parking
Fig. 2 and 3 are:
1. a second ignition air valve; 2. a second step of boosting oxygen valve; 3. a second main oxygen valve; 4. an oxygen purge valve; 5. a fuel gas purge valve; 6. a second step-up fuel gas valve; 7. a second ignition fuel gas valve; 8. a second waste water valve; 9. a pulverized coal valve; 10. a pulverized coal purge valve; 11. a first ignition air valve; 12. a first step of boosting oxygen valve; 13. a first primary oxygen valve; 14. an oxygen purge line; 15. a fuel gas purge line; 16. a first step up fuel gas valve; 17. a first ignition fuel gas valve; 18. a first waste water valve; 19. an ignition air line; 20. a boost oxygen line; 21. a main oxygen line; 22. a boosted fuel gas line; 23. an ignition fuel gas line; 24. a waste water line; 25. a pulverized coal purge line; 26. an ejector valve; 27. a chilled water return valve; 28. a chilled water pump outlet valve; 29. a chilled water pump inlet valve; 30. a raw synthesis gas feed-out valve; 31. a crude synthesis gas delivery bypass valve; 32. a raw synthesis gas vent valve; 33. a first slag discharging valve; 34. a second slag discharging valve; 35. a slag valve of a slag lock hopper; 36. a gasification furnace; 37. a washing tower; 38. a slag lock bucket; 39. a chilled water filter; 40. a ejector separator tank; 41. a extractor; 42. a venturi scrubber; 43. a chilled water pump; 44. injector steam valve 45, pulverized coal conveying pipeline 46, blow-down pipeline 47, main controller.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The invention relates to a system for controlling the start/stop of a clean pulverized coal gasification device for treating wastewater, which realizes the control of the clean pulverized coal gasification device for treating wastewater, and is a start/stop control system for generating crude synthetic gas by injecting fuel gas, oxygen, pulverized coal and wastewater into a gasification furnace through a nozzle.
In the system for controlling the start/stop, in order to realize the respective control, the feeding pipelines with different materials and different functions are specifically composed of an ignition air pipeline, an ignition fuel gas pipeline, a boosting oxygen pipeline, a main oxygen pipeline, a pulverized coal purging pipeline, a fuel gas purging pipeline, a main oxygen purging pipeline, a crude synthesis gas outlet pipeline, a quenching waterway of a gasification furnace, a crude synthesis gas discharging pipeline and a slag discharging pipeline.
The burner inlet of the pulverized coal gasification device is connected with each feeding pipeline, a valve is arranged on the feeding pipeline, the outlet of the pulverized coal gasification device is connected with a slag and synthesis gas pipeline, the slag and synthesis gas pipeline is provided with the valve, and the valve is used for controlling the inlet and outlet of various materials of the whole pulverized coal gasification device, so that the purpose of smooth operation of the pulverized coal gasification device is achieved.
The operation process of the on/off control method is as follows:
1) Air-tight leakage test and replacement
The clean pulverized coal gasification device for treating the wastewater is pressurized to the airtight test pressure by using inert gas, the pressurization and depressurization are repeated for three times, the pressure relief replacement is carried out after the airtight test is qualified, the system is changed into the inert gas environment, and the safety during ignition and feeding is improved;
2) Ignition of
Before the program control valve leads air and fuel gas to the burner, after the step 1 (airtight leakage test and replacement) is finished, executing an ignition command, and opening the second ignition air valve 1 and the second ignition fuel gas valve 7 by program control to ignite;
3) Boosting of pressure
After the step 2 (ignition) is finished, the procedure opens the second step 2 of boosting oxygen valve and the second step 6 of boosting fuel valve to boost the system to 0.9-4.0Mpa;
4) Coal feeding
After the step 3 (step up) is finished, the program opens the second main oxygen valve 3 and the pulverized coal valve 9, and puts oxygen and pulverized coal into the system, and the pressure of the system is controlled to be increased to 3.5-4.0MPa;
5) Throwing waste water
After the step 4 (coal feeding) is finished, executing a wastewater input command, opening a second wastewater valve 8 which enters the burner, and inputting the wastewater into the gasification furnace through a wastewater channel of the burner for combustion;
6) Air guide
After the step 4 (coal feeding) is finished, executing an air guide command, opening an outlet valve bypass to replace a heating pipe, opening a crude synthesis gas outlet valve 30 after a preset time, closing a crude synthesis gas vent valve 32, and sending the crude synthesis gas to a rear system.
7) Parking
Executing a parking command, closing the second main oxygen valve 3, the pulverized coal valve 9 and the crude synthesis gas outward-feeding valve 30, opening the crude synthesis gas emptying valve 32, opening the purging and replacement gas valve, and performing parking purging, replacement and cooling on the system to ensure safe parking of the system.
Wherein step 1) may specifically include:
(1) Closing a raw synthesis gas delivery valve 30 and a raw synthesis gas delivery bypass valve 31, closing a raw synthesis gas blow-off valve 32, opening an inlet burner purge displacement valve oxygen purge valve 4, a fuel gas purge valve 5 and a pulverized coal purge valve 10, switching to a boost mode, and closing the inlet burner purge displacement valve oxygen purge valve 4, the fuel gas purge valve 5 and the pulverized coal purge valve 10 after boosting to a preset value to perform a first air tightness test;
(2) Opening the crude synthesis gas vent valve 32, switching to a 'depressurization mode' to reduce the pressure to a preset value, completing a first air tightness test, and performing a second air tightness test and a third air tightness test according to the same steps;
(3) After the third airtight test is completed, triggering the signal of the completion of the step 1).
The specific steps of the step 2 are as follows:
(1) Opening the first ignition air valve 11 and the first ignition fuel gas valve 17, and introducing air and fuel gas for ignition into the front of the burner valve;
(2) Opening the injector valve 26, closing the crude synthesis gas delivery valve 30 and the crude synthesis gas vent valve 32, and maintaining the micro negative pressure state of the system;
(3) After the step 1 is completed and the signal is triggered, an ignition command is executed, the second ignition air valve 1 and the second ignition fuel gas valve 7 are opened to carry out ignition, and a signal of successful ignition triggering after flame combustion is detected.
The specific steps of the step 3 are as follows:
(1) Confirming a purge replacement valve oxygen purge valve 4; the fuel gas purge valve 5 and the pulverized coal purge valve 10 are all in a closed state;
(2) Opening the second step-up fuel gas valve 6 and the second step-up oxygen gas valve 2 to a preset opening degree, and starting step-up by the system;
(3) After a predetermined time is reached, the second ignition air valve 1, the second ignition fuel air valve 7 and the injector valve 26 are closed;
(4) Automatically controlling the opening of a rough synthesis gas vent valve 32, maintaining the pressure increasing rate to be 0.05MPa/min, and increasing the pressure to a set value
The specific steps of the step 4 are as follows:
(1) Opening a main oxygen valve 3 and a pulverized coal valve 9, and throwing oxygen and pulverized coal into the system;
(2) After the preset time is reached, the second step-up oxygen valve 2 and the second step-up fuel valve 6 are closed;
(3) Automatically controlling the opening of a crude synthesis gas vent valve 32, maintaining the pressure rising rate to be 0.05MPa/min, and increasing the pressure to a set value (3.5-4.0 MPa)
The specific steps of the step 5 are as follows:
(1) Opening the first waste water valve 18 to introduce waste water into the burner valve;
(2) After the system pressure reaches a predetermined value, a "waste water throw-in" command is executed, the second waste water valve 8 is opened, and waste water is thrown into the burner.
The specific steps of the step 6 are as follows:
(1) After the system pressure reaches a preset value, executing an air guide command, opening an external rough synthesis gas valve bypass 31, and heating, replacing and pressurizing a pipeline behind the valve;
(2) After a predetermined time, the send-out raw synthesis gas valve 30 is opened, the bypass valve 31 is closed, and the raw synthesis gas is sent out of the system.
The specific steps of the step 7 are as follows:
(1) Executing a parking command or interlocking triggering parking command, and closing the second main oxygen valve 3, the pulverized coal valve 9, the coarse synthesis gas delivery valve 30 and the second waste water valve 8;
(2) Opening a raw synthesis gas vent valve 32, opening each purge replacement valve and an oxygen purge valve 4; the system is subjected to shutdown purging, replacement, cooling and pressure relief by the fuel gas purging valve 5 and the pulverized coal purging valve 10.
The residue in the gasifier passes through a first slag valve 33 and a second slag valve 34 below the gasifier and enters a slag lock hopper 38. The residue in the lock hopper 38 is finally discharged through the lock hopper lower slag valve 35.
The post system is a downstream system that uses raw syngas as a feedstock.
A clean pulverized coal gasification system for treating wastewater comprises a gasification furnace 36, a pulverized coal pipeline, an oxygen pipeline, a fuel gas pipeline, a slag lock hopper, a synthetic gas washing device, an injection device, an emptying device and an outward feeding device; the burner of the gasifier 36 is provided with three openings, namely an oxygen opening, a pulverized coal opening and a fuel gas opening, wherein the oxygen opening is connected with an oxygen pipeline, and the oxygen pipeline is provided with four branch pipelines, namely an ignition air pipeline 19, a booster oxygen pipeline 20, a main oxygen pipeline 21 and an oxygen purging pipeline 14; the pulverized coal opening is connected with a pulverized coal pipeline, and the pulverized coal pipeline is provided with two branch pipelines, namely a pulverized coal purging pipeline 25 and a pulverized coal conveying pipeline 45; the fuel gas opening is connected with a fuel gas pipeline, and the fuel gas pipeline is provided with four branch pipelines, namely a fuel gas purging pipeline 15, a boosting fuel gas pipeline 22, an ignition fuel gas pipeline 23 and a waste water pipeline 24; the middle part of the gasification furnace is respectively connected with the synthesis gas washing device and the injection device through a synthesis gas outlet pipeline; the top of the synthetic gas washing device is respectively connected with the emptying device and the outward feeding device through a crude synthetic gas outward feeding pipeline, the bottom of the synthetic gas washing device is connected with the gasification furnace through a chilling water pipeline, and the bottom of the gasification furnace is connected with the slag lock hopper.
The synthesis gas washing device comprises a venturi scrubber 42, a washing tower 37, a chilling water pump 43 and a chilling water filter 39, wherein a synthesis gas outlet pipeline is connected with the venturi scrubber 42, the venturi scrubber 42 is connected with the washing tower 37, a bottom chilling water outlet of the washing tower 37 is connected with the chilling water pump 43, an outlet of the chilling water pump 43 is connected with the chilling water filter 39, and a chilling water outlet of the chilling water filter 39 is connected with the gasifier 36.
The bottom of the washing tower 37 is provided with two openings, which are respectively connected with two chilled water pipelines, one pipeline is provided with a chilled water reflux valve 27, the other pipeline is provided with a chilled water pump 43, the front and the back of the chilled water pump 43 are respectively provided with a chilled water pump inlet valve 28 and a chilled water pump outlet valve 29, and the pipeline of the chilled water reflux valve 27 is firstly connected with the pipeline of the outlet of the chilled water pump outlet valve 29 and then connected with a chilled water filter 39.
The extractor device comprises an extractor 41, an extractor separation tank 40 and an extractor steam valve 44, wherein a branch pipeline of a synthetic gas outlet pipeline is connected with the extractor 41, a steam inlet of the extractor 41 is connected with the extractor steam valve 44, an outlet of the extractor 41 is connected with the extractor separation tank 40, and the extractor valve 26 is arranged on the branch pipeline of the synthetic gas outlet pipeline.
The venting means comprises a vent line 46, and a raw synthesis gas vent valve 32 is provided in the vent line 46.
The external conveying device comprises a crude synthesis gas external conveying valve 30 and a crude synthesis gas external conveying bypass valve 31, wherein a crude synthesis gas external conveying pipeline is connected with pipelines where the crude synthesis gas external conveying valve 30 and the crude synthesis gas external conveying bypass valve 31 are respectively, the pipelines where the crude synthesis gas external conveying valve 30 and the crude synthesis gas external conveying bypass valve 31 are arranged are converged and then connected with a rear system, and the rear system is a crude synthesis gas further processing system outside a boundary zone.
A pulverized coal valve 9 is arranged on the pulverized coal conveying pipeline 45; a pulverized coal purge valve 10 is arranged on the pulverized coal purge line 25; an oxygen purge valve 10 is arranged on the oxygen purge line; a fuel gas purge valve 10 is provided in the fuel gas purge line 25.
A second ignition air valve 1 and a first ignition air valve 11 are arranged on the ignition air line 19; the second step-up oxygen valve 2 and the first step-up oxygen valve 12 are arranged on the step-up oxygen pipeline 20.
The main oxygen pipeline 21 is provided with a second main oxygen valve 3 and a first main oxygen valve 13; the second step-up fuel gas valve 6 and the first step-up fuel gas valve 16 are provided in the step-up fuel gas line 22.
The ignition fuel gas pipeline 23 is provided with a second ignition fuel gas valve 7 and a first ignition fuel gas valve 17; a second waste valve 8 and a first waste valve 18 are provided on the waste line 24.
A first slag valve 33 and a second slag valve 34 are arranged on a pipeline connected with the gasifier 36 and the slag lock hopper 38; a slag lock hopper lower slag valve 35 is arranged on a pipeline below the slag lock hopper 38.
As shown in figure 3 of the drawings,
each valve is individually connected to the main controller 47;
the post system is a downstream system that uses raw syngas as a feedstock.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (7)
1. A control method of a clean pulverized coal gasification device for treating wastewater is characterized in that: the method comprises the following specific steps:
1) Air-tight leakage test and replacement
The clean pulverized coal gasification device for treating the wastewater is pressurized to the airtight test pressure by using inert gas, the pressurization and depressurization are repeated for three times, the pressure relief replacement is carried out after the airtight test is qualified, the system is changed into the inert gas environment, and the safety during ignition and feeding is improved;
2) Ignition of
Before the program control valve leads air and fuel gas to the burner, after the airtight leakage test and replacement of the step 1) are finished, executing an ignition command, and opening the ignition air valve and the fuel gas valve under program control, and igniting;
3) Boosting of pressure
After the ignition of the step 2) is finished, the procedure opens the boosting oxygen valve and the fuel valve to boost the pressure of the system to 0.9-4.0Mpa;
4) Coal feeding
After the step 3) is completed, the program opens a main oxygen valve and a pulverized coal valve, oxygen and pulverized coal are put into the system, and the pressure of the system is controlled to be increased to 3.5-4.0MPa;
5) Throwing waste water
After the coal feeding is finished, executing a wastewater feeding command, opening a wastewater valve of a combustor, and feeding wastewater into the gasifier through a wastewater channel of the combustor for combustion;
6) Air guide
After the coal feeding is finished, executing an air guide command, opening an outer delivery valve bypass to replace a heating pipe, opening the outer delivery valve after a preset time is reached, closing an emptying valve, and delivering the crude synthetic gas to a rear system;
7) Parking
Executing a parking command, closing a main oxygen valve, a pulverized coal valve and a crude synthesis gas outward-feeding valve, opening a crude synthesis gas emptying valve, opening a blowing and purging displacement valve, and performing parking blowing, displacement and cooling on the system to ensure safe parking of the system;
the specific steps of the step 1) are as follows:
(1) The system of the clean pulverized coal gasification device for treating wastewater is isolated, a system valve after crude synthesis gas is removed is closed, a crude synthesis gas emptying valve is closed, a burner inlet blowing and replacing valve is opened, the system is switched to a boosting mode, and the burner inlet blowing and replacing valve is closed after boosting to a preset value for performing a first air tightness test;
(2) Opening the crude synthesis gas emptying valve, switching to a 'depressurization mode', depressurizing to a preset value, completing a first airtight test, and performing a second airtight test and a third airtight test according to the same steps;
(3) Triggering the signal of finishing the step 1) after finishing the third airtight test;
the specific steps of the step 2) are as follows:
(1) Opening a first air and fuel gas valve, and introducing air and fuel gas for ignition into front of a burner valve;
(2) Opening a large ejector valve, closing a coarse synthesis gas delivery valve and a coarse synthesis gas emptying valve, and maintaining a system micro negative pressure state;
(3) After the step 1) is completed and the signal is triggered, an ignition command is executed, a second ignition air valve and an ignition fuel gas valve are opened to perform ignition, and a signal of ignition success is triggered after flame combustion is detected.
2. The control method according to claim 1, characterized in that: the specific steps of the step 3) are as follows:
(1) Confirming the closing state of the purging replacement valve;
(2) Opening a second step-up fuel gas valve and a second step-up oxygen gas valve to a preset opening degree, and starting step-up by the system;
(3) After reaching the preset time, closing the second ignition air valve, the second ignition fuel air valve and the ejector valve;
(4) And automatically controlling the opening of a crude synthesis gas vent valve, maintaining the pressure increasing rate to be 0.05MPa/min, and increasing the pressure to a set value.
3. The control method according to claim 1, characterized in that: the specific steps of the step 4) are as follows:
(1) Opening a main oxygen valve and a pulverized coal valve, and throwing oxygen and pulverized coal into the system;
(2) After the preset time is reached, closing the boost oxygen valve and the boost fuel valve;
(3) Automatically controlling the opening of a crude synthesis gas vent valve, maintaining the pressure increasing rate to be 0.05MPa/min, and increasing the pressure to be 3.5-4.0MPa.
4. The control method according to claim 1, characterized in that: the specific steps of the step 5) are as follows:
(1) Opening a first waste water valve, and introducing waste water into the front of the burner valve;
(2) After the system pressure reaches a preset value, a wastewater input command is executed, a second wastewater valve is opened, and wastewater is input into the burner.
5. The control method according to claim 1, characterized in that: the specific steps of the step 6) are as follows:
(1) After the system pressure reaches a preset value, executing an air guide command, opening an external rough synthesis gas valve bypass, and heating, replacing and pressurizing a pipeline behind the valve;
(2) After the preset time is reached, an outward-feeding raw synthesis gas valve is opened, a bypass valve is closed, and raw synthesis gas is sent out of the system.
6. The control method according to claim 1, characterized in that: the specific steps of the step 7) are as follows:
(1) Executing a parking command or interlocking triggering parking command, and closing a second main oxygen valve, a pulverized coal valve, a coarse synthesis gas delivery valve and a second waste water valve;
(2) And (3) opening a crude synthesis gas vent valve, opening each purging and replacing valve, and stopping purging, replacing, cooling and decompressing the system.
7. A clean pulverized coal gasification system for treating wastewater, characterized in that: comprises a gasification furnace, a pulverized coal pipeline, an oxygen pipeline, a fuel gas pipeline, a slag lock hopper, a synthetic gas washing device, an injection device, an emptying device and an outward feeding device; the gasification furnace is vertically arranged, a burner at the top of the gasification furnace is provided with three openings, namely an oxygen opening, a pulverized coal opening and a fuel gas opening, the oxygen opening is connected with an oxygen pipeline, and four branch pipelines, namely an ignition air pipeline, a boosting oxygen pipeline, a main oxygen pipeline and an oxygen purging pipeline, are arranged on the oxygen pipeline; the pulverized coal opening is connected with a pulverized coal pipeline, and the pulverized coal pipeline is provided with two branch pipelines which are a pulverized coal purging pipeline and a main pulverized coal pipeline respectively; the fuel gas opening is connected with a fuel gas pipeline, and the fuel gas pipeline is provided with four branch pipelines which are a fuel gas purging pipeline, a boosting fuel gas pipeline, an ignition fuel gas pipeline and a waste water pipeline respectively; the middle part of the gasification furnace is respectively connected with the synthesis gas washing device and the injection device through a synthesis gas outlet pipeline; the top of the synthetic gas washing device is respectively connected with the emptying device and the delivery device through a crude synthetic gas delivery pipeline, the bottom of the synthetic gas washing device is connected with the gasification furnace through a chilling water pipeline, and the bottom of the gasification furnace is connected with the slag lock hopper;
the synthetic gas washing device comprises a Venturi scrubber, a washing tower, a chilled water pump and a chilled water filter, wherein a synthetic gas outlet pipeline is connected with the Venturi scrubber, the Venturi scrubber is connected with the washing tower, a bottom chilled water outlet of the washing tower is connected with the chilled water pump, an outlet of the chilled water pump is connected with the chilled water filter, and the chilled water filter is connected with the gasifier;
the extraction device comprises an extractor, an extractor separating tank and an extractor steam valve, wherein a branch pipeline of the synthetic gas outlet pipeline is connected with the extractor, a steam inlet of the extractor is connected with the extractor steam valve, an outlet of the extractor is connected with the extractor separating tank, and the extractor valve is arranged on the branch pipeline of the synthetic gas outlet pipeline.
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| CN102618332A (en) * | 2011-12-23 | 2012-08-01 | 航天长征化学工程股份有限公司 | Starting/stopping control method and system for powdered coal pressure gasification device |
| CN104449867A (en) * | 2014-11-20 | 2015-03-25 | 水煤浆气化及煤化工国家工程研究中心 | Method for controlling igniter burner of powdered coal pressurized gasifier |
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| CN208632470U (en) * | 2018-06-22 | 2019-03-22 | 鲁西化工集团股份有限公司 | A kind of clean type coal gasification system handling waste water |
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| CN102618332A (en) * | 2011-12-23 | 2012-08-01 | 航天长征化学工程股份有限公司 | Starting/stopping control method and system for powdered coal pressure gasification device |
| CN104449867A (en) * | 2014-11-20 | 2015-03-25 | 水煤浆气化及煤化工国家工程研究中心 | Method for controlling igniter burner of powdered coal pressurized gasifier |
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