CN115820302A - Process method for pressure test of crushed coal pressure gasification device system - Google Patents
Process method for pressure test of crushed coal pressure gasification device system Download PDFInfo
- Publication number
- CN115820302A CN115820302A CN202211500643.3A CN202211500643A CN115820302A CN 115820302 A CN115820302 A CN 115820302A CN 202211500643 A CN202211500643 A CN 202211500643A CN 115820302 A CN115820302 A CN 115820302A
- Authority
- CN
- China
- Prior art keywords
- pressure
- gasification furnace
- nitrogen
- gasification
- medium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Examining Or Testing Airtightness (AREA)
Abstract
The application relates to a process method for pressure test of a crushed coal pressure gasification device system, which comprises the steps of carrying out air tightness on a gasification furnace by using a low-pressure nitrogen pipeline; slightly opening an air regulating valve of the gasification furnace to slowly boost the pressure of the gasification furnace; when the pressure reaches 0.4MPa, closing the air regulating valve of the gasification furnace, and carrying out air tightness inspection on the gasification furnace; after the inspection is qualified, turning over the low-pressure nitrogen blind plate and switching on the medium-pressure nitrogen blind plate; boosting the pressure of the gasification furnace by using medium-pressure nitrogen; closing the air regulating valve of the gasification furnace, and carrying out air tightness inspection on the gasification furnace; closing the medium-pressure nitrogen valve, reversely feeding the medium-pressure nitrogen valve into the frame, closing a rear blind plate of the medium-pressure nitrogen valve, conducting a rear blind plate of a pipeline valve of a newly-added nitrogen compressor feeding frame, and pressurizing the gasification furnace by using the newly-added nitrogen compressor; adjusting an air adjusting valve, slowly increasing the pressure of the gasification furnace to 4.6MPa, checking that no leakage exists, and maintaining the pressure for 2 hours until the air tightness is finished; the gasification furnace slowly releases pressure to normal pressure. This application reduces the leakage risk of gasifier in-process of driving and shortens the time of driving simultaneously, reduces the expense of driving.
Description
Technical Field
The application relates to a process method for pressure test of a crushed coal pressure gasification device system.
Background
The crushed coal pressurized gasification furnace is mostly stopped due to equipment failure (coal ash lock upper and lower valve failure) and easy damaged equipment life expiration replacement (coal ash lock upper and lower valves, grate eccentric sleeve filler and the like), the gasification furnace body must be disassembled for equipment maintenance and accessory replacement after the stop, and pressure test must be carried out on the equipment before the new and overhaul coal gas generation furnace is driven again according to the requirements in the industrial enterprise coal gas safety code GB 6222-2005.
The designed operating pressure of the crushed coal pressurized gasifier is 4.0MPa, the air pressure of a device produced by a matched public engineering air separation device is 0.4MPa, the nitrogen pressure grade is 0.4MPa and 2.0MPa, and the air tightness test pressure is required to be the designed pressure of the pressure vessel according to TSG21-2016 3.2.13.1 regulation of fixed pressure vessel safety technology supervision regulations. The pressure test pressure of the crushed coal pressure gasification unit is 4.6 (g) MPa. The pressure of a pressure test medium provided by public works cannot meet the requirement of a crushed coal pressurized gasification furnace for overhaul and overhaul to carry out a tight pressure test. In order to realize the air source with the pressure grade required by the tightness test, liquid nitrogen produced by the air separation device is hauled by a liquid nitrogen tanker in the early stage, and then is pressurized into a crushed coal gasification furnace by a liquid nitrogen skid-mounted device to carry out a pressure test. If the leakage amount of equipment is large in the process of using the scheme to carry out a pressure test, the liquid nitrogen storage amount of the liquid nitrogen tank car is limited, and repeated pressure increasing and testing are required after leakage elimination. The start-up time of the gasification furnace is greatly prolonged, the pressure test medium is wasted, and the economic cost is greatly increased.
According to the process kit provided by the original design institute, after the hydraulic strength test is carried out after the overhaul of the crushed coal pressurized gasifier, the low-pressure test (the pressure test medium is 0.4MPa of nitrogen) is adopted in the restart tightness test after the gasifier is generally disintegrated, the process gas is pressurized to be airtight at the grade of 2.0MPa-4.0 MPa in the start stage of the gasifier after the pressure test is finished, and the leakage and the thermal tightness of key leakage parts of the gasifier are checked in the whole pressure boosting process. As leakage appears along with the rise of equipment pressure in the driving process, most leaked media are crude gas (the main components are combustible gases such as CO, H2, CH4 and the like), are toxic, harmful, high in temperature and high in pressure, and serious accidents such as great safety risk and even gasification flash explosion easily occur due to leakage detection and hot pressing in the process. If the furnace is not pressed, the furnace has to be stopped, the pressure is released and the leakage is eliminated, and certain difficulty is caused in the culture of the whole bed layer in the later stage gasification furnace driving process and the adjustment of the working condition after the driving.
Disclosure of Invention
In view of the above existing defects, the present application aims to provide a process method for pressure testing of a crushed coal pressure gasification device system.
The purpose of the application is realized as follows: a pressure testing process method for a crushed coal pressure gasification device system comprises the following steps:
and 2, when the pressure reaches 0.4MPa, closing the air regulating valve of the gasification furnace, and carrying out 0.4MPa air tightness inspection on the gasification furnace. Each flange was inspected and an air-tightness confirmation table was filled. After the inspection is qualified, turning over a low-pressure nitrogen blind plate at 0.4MPa, and conducting a medium-pressure nitrogen blind plate at 2.0 MPa;
and 6, finally increasing the pressure of the gasification furnace to 4.6MPa, checking that no leakage exists, and keeping the pressure for 2 hours to finish air tightness.
And 7, slowly releasing the pressure of the gasification furnace to normal pressure, controlling the pressure release rate to be less than or equal to 0.05MPa/min, and keeping the pressure difference between the gasification furnace and the jacket to be not more than 50KPa.
Due to the implementation of the technical scheme, medium-pressure nitrogen (2.0 MPa) produced by the air separation unit of the unit public engineering is used as a medium gas source for the tightness test of the crushed coal pressure gasification unit, a set of reciprocating compressor is additionally arranged to increase the pressure of the medium-pressure nitrogen with the pressure of 2.0MPa to 4.6MPa through the processes of compression, cooling, separation and the like, and then the tightness test of the crushed coal pressure gasification unit is carried out in a grading manner before the gasification furnace is started. If leakage exists in the test process, the airtight medium is inert gas nitrogen, leakage can be eliminated under pressure, if leakage elimination under pressure cannot be realized, pressure is timely relieved, leakage risk in the driving process of the gasification furnace is reduced, driving time is shortened, and driving cost is effectively reduced.
Drawings
The specific structure of the application is given by the following figures and examples:
FIG. 1 is a schematic diagram of the system architecture of the present application;
FIG. 2 is a flow chart of a 2MPa-4.6MPa air tightness test;
figure 3 is a flow chart of the nitrogen press test process.
Legend: 121V2801 coal lock, 121R2801 gasifier, 121V2104 ash lock,
1. the system comprises a gas storage tank, 2, a nitrogen compressor, 3, a first-stage separator, 4, a first-stage gas inlet buffer, 5, a first-stage exhaust buffer, 6, a first-stage cooler, 7, an oil cooler, 8, a thin oil station, 9 and a gasification furnace.
Detailed Description
The present application is not limited to the following examples, and specific implementations may be determined according to the technical solutions and practical situations of the present application.
Example (b): as shown in fig. 1 and 2, a process for pressure test of a crushed coal pressure gasification device system comprises the following steps:
and 2, when the pressure reaches 0.4MPa, closing the air regulating valve of the gasification furnace, and carrying out 0.4MPa air tightness inspection on the gasification furnace. Checking each flange, filling an airtight confirmation table, inverting a blind 0.4MPa low-pressure nitrogen blind plate after the flange is qualified, and conducting a 2.0MPa medium-pressure nitrogen blind plate;
and 6, finally increasing the pressure of the gasification furnace to 4.6MPa, checking that no leakage exists, and keeping the pressure for 2 hours to finish air tightness.
And 7, slowly releasing the pressure of the gasification furnace to normal pressure, controlling the pressure release rate to be less than or equal to 0.05MPa/min, and controlling the pressure difference between the gasification furnace and the jacket to be not more than 50KPa.
Further, in the step 4, after the 2.0MPa air tightness of the crushed coal pressure gasification furnace is finished, boundary area valves of three frames of an A/B/C of the 2.0MPa medium-pressure nitrogen header gas inlet furnace are closed, meanwhile, blind plates are guided, then, a blind plate of a newly-added nitrogen compressor gas inlet 2.0MPa medium-pressure nitrogen header gas inlet pipe is conducted, and a stop valve of an outlet pipeline of the nitrogen compressor is opened. The medium-pressure nitrogen of 2.0MPa is compressed and pressurized to 4.6MPa in a reciprocating way through a nitrogen compressor, and the pressure is returned to a boundary area valve of a medium-pressure nitrogen header of 2.0MPa, and then a tightness test is carried out on the gasification furnace with three frames of gasification A/B/C.
And 5, if leakage is found to be fastened in a maintenance unit in the boosting process, boosting is continued after fastening. If the gasification furnace is not tight or the leakage is large, the gasification furnace is discharged to normal pressure for eliminating the deficiency.
In step 6, if the leakage is found to be fastened by a maintenance unit, the airtight pressure rise is finished after the tightness is fastened. If the gasification furnace is not tight or the leakage is large, the gasification furnace is discharged to normal pressure for eliminating the deficiency.
Tightness test before driving after overhaul before step 1: pressurizing the gasification furnace to 4.0MPa by using low-pressure nitrogen of 0.4MPa as an airtight medium through a coal gas locking compressor; if a plurality of gasification furnaces are used for simultaneously carrying out tightness tests, when the gas pumping amount of the coal gas locking compressor is insufficient, the newly-added nitrogen compressor is matched for use to increase the pressure to 4.6MPa.
The whole tightness test of the crushed coal pressure gasification device uses nitrogen as an airtight medium, and nitrogen sources (0.4 MPa, 2.0MPa and 4.6 MPa) with three pressure levels are adopted. The nitrogen gas source (0.4 MPa, 2.0 MPa) is produced by an air separation device in the factory, and the nitrogen gas source (4.6 MPa) is provided by middle-pressure nitrogen pressurized by a newly-added nitrogen press and pressurized by 2.0MPa (one is opened and the other is prepared).
The tightness test process of the crushed coal pressure gasification device adopts 5-grade air tightness, and the pressure grades are respectively 0.4MPa, 1.0MPa, 2.0MPa, 3.0MPa and 4.6MPa. And (4) carrying out pressure maintaining and leakage checking under different pressure grades, and entering higher-grade pressure to carry out an airtight test after the leakage checking and leakage eliminating of the low-pressure grade airtight test are qualified until the design pressure is 4.6MPa.
Nitrogen sources (0.4 MPa, 2.0MPa and 4.6 MPa) with three pressure levels for providing gas sources enter the crushed coal pressure gasification device and are connected through an air pipeline swinging head originally configured in the gasification furnace. The back pressure bearing of a stop valve of a single-furnace air line boundary area is 600Lb, and three air sources are controlled by using a valve bank of an air line in a pressurizing and airtight process (comprising an adjusting valve, a one-way valve and a pore plate flowmeter). When the section of pipeline is used for carrying out an airtight test, the rear blind plate of the air boundary area valve needs to be reversed in advance.
After the newly-added nitrogen compressor uses 2.0MPa medium-pressure nitrogen produced by an air separation device as an air source to perform reciprocating compression, the pressure is increased to 4.6MPa and the pressure is returned to a 2.OMPa medium-pressure nitrogen header inlet device boundary valve, and then the 2.0MPa medium-pressure nitrogen header boundary valve is ensured to be inverted blind. The two pressure levels (2.0 MPa and 4.6 MPa) are the same with one main pipeline, and only pressure switching is allowed. Meanwhile, the same process flow can be carried out when two kinds of pressure nitrogen enter the gasification furnace.
As shown in figure 3, in the nitrogen compressor test process flow, 2.0MPa nitrogen at the temperature of 30 ℃ from a medium-pressure nitrogen pipe network enters a primary gas inlet buffer 4 after being stabilized by a gas storage tank 1, enters a primary exhaust buffer 5 after being compressed to 4.6MPa and 114 ℃ by a nitrogen compressor 2, enters a primary cooler 6 to be cooled to 40 ℃, enters a primary separator 3 to separate process liquid, the separated process liquid is discharged into an oil cooler 7 and is discharged into a thin oil station 8 after being cooled, gas is divided into two paths from the top of the primary separator 3, one path is used for gasifying gasification furnaces 9 of three frames of A/B/C, and the other path is returned to a front inlet pipeline of the primary gas inlet buffer 4 and is used for adjusting unit load and starting and stopping the machine.
Before the gasification furnace is started, the tightness test under the corresponding pressure grade required by national regulations is finished, so that the air tightness unsafety in the starting process is avoided. The use of nitrogen (inert gas) in the gas-tight leak-stopping process reduces the risk of using the process gas-tight in the gas-tight leak-stopping process of the current scheme. The problem that the existing scheme needs stopping to relieve pressure for leakage elimination after leakage occurs in the airtight process is solved, the driving time is prolonged, the waste of driving raw materials is caused, and the driving cost of the gasification furnace is increased.
The foregoing description is by way of example only and is not intended as limiting the embodiments of the present application. All obvious variations and modifications of the present invention are within the scope of the present invention.
Claims (6)
1. A pressure test process method for a crushed coal pressure gasification device system is characterized by comprising the following steps:
step 1, carrying out air tightness of 0.4MPa on a gasification furnace by using a low-pressure nitrogen pipeline; slightly opening an air regulating valve of the gasification furnace to slowly boost the gasification furnace, controlling the boosting rate to be less than or equal to 0.05MPa/min, and controlling the pressure difference between the gasification furnace and a jacket to be not more than 50KPa;
step 2, when the pressure reaches 0.4MPa, closing an air regulating valve of the gasification furnace, carrying out 0.4MPa air tightness inspection on the gasification furnace, inspecting each flange, turning over a low-pressure nitrogen blind plate of 0.4MPa after the inspection is qualified, and conducting a medium-pressure nitrogen blind plate of 2.0 MPa;
step 3, when the pressure of the gasification furnace is increased to 2.0MPa by using 2.0MPa medium-pressure nitrogen, stopping increasing the pressure; closing the air regulating valve of the gasification furnace, carrying out 2.0MPa air tightness inspection on the gasification furnace, and inspecting each flange;
step 4, closing a 2.0MPa medium-pressure nitrogen valve, reversing the blind plate into the rear blind plate of the medium-pressure nitrogen valve of the frame, conducting a newly-added nitrogen compressor into the rear blind plate of the pipeline valve of the frame, and pressurizing the gasification furnace by using the newly-added nitrogen compressor;
step 5, adjusting an air regulating valve, slowly boosting the pressure of the gasification furnace, controlling the boosting rate to be less than or equal to 0.05MPa/min, and controlling the gasification furnace and the jacket to be less than 50KPa;
step 6, finally increasing the pressure of the gasification furnace to 4.6MPa, checking that no leakage exists, and keeping the pressure for 2 hours until the airtightness is finished;
and 7, slowly releasing the pressure of the gasification furnace to normal pressure, controlling the pressure release rate to be less than or equal to 0.05MPa/min, and keeping the pressure difference between the gasification furnace and the jacket to be not more than 50KPa.
2. The process method for testing the pressure of the crushed coal pressure gasification device system according to claim 1, wherein: in the step 4, after the crushed coal pressure gasification furnace is airtight at 2.0MPa, the boundary area valves of three frames of the gasification A/B/C of the medium-pressure nitrogen header gas inlet furnace at 2.0MPa are closed, simultaneously, the blind plates are guided, then the blind plates of the medium-pressure nitrogen header gas inlet furnace at 2.0MPa of a newly-added nitrogen compressor are conducted, the stop valve of the outlet pipeline of the nitrogen compressor is opened, the medium-pressure nitrogen at 2.0MPa is compressed and pressurized to 4.6MPa in a reciprocating manner through the nitrogen compressor, and the pressure is returned to the boundary area valves of the medium-pressure nitrogen header gas at 2.0MPa to perform a tightness test for the gasification furnace with three frames of the gasification A/B/C.
3. The process method for testing the pressure of the crushed coal pressure gasification device system according to claim 1, wherein: and 5, if leakage is found to be fastened by a maintenance unit in the boosting process, continuing boosting after fastening, and if the leakage is not fastened or large, releasing the gasification furnace to normal pressure for eliminating the deficiency.
4. The process method for testing the pressure of the crushed coal pressure gasification device system according to claim 1, wherein: and 6, if the leakage is found to be fastened by a maintenance unit, the airtight pressurization is finished after the fastening, and if the leakage is not fastened or large, the gasification furnace is discharged to normal pressure for eliminating the defect.
5. The process method for testing the pressure of the crushed coal pressure gasification device system according to claim 2, wherein: the tightness test process adopts 5-grade air tightness, the pressure grades are respectively 0.4MPa grade, 1.0MPa grade, 2.0MPa grade, 3.0MPa grade and 4.6MPa grade, pressure maintaining leak detection is carried out under different pressure grades, and after the leak detection and leakage elimination of the low-pressure grade air tightness test are qualified, a higher-grade pressure can be carried out for carrying out the air tightness test until the design pressure is 4.6MPa.
6. The process method for testing the pressure of the crushed coal pressure gasification device system according to claim 1, wherein: tightness test before driving after overhaul before step 1: pressurizing the gasification furnace to 4.0MPa by using low-pressure nitrogen of 0.4MPa as an airtight medium through a coal gas locking compressor; if a plurality of gasification furnaces are used for simultaneously carrying out tightness tests, when the gas pumping amount of the coal gas locking compressor is insufficient, the newly-added nitrogen compressor is matched for use to increase the pressure to 4.6MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211500643.3A CN115820302A (en) | 2022-11-29 | 2022-11-29 | Process method for pressure test of crushed coal pressure gasification device system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211500643.3A CN115820302A (en) | 2022-11-29 | 2022-11-29 | Process method for pressure test of crushed coal pressure gasification device system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115820302A true CN115820302A (en) | 2023-03-21 |
Family
ID=85532052
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211500643.3A Pending CN115820302A (en) | 2022-11-29 | 2022-11-29 | Process method for pressure test of crushed coal pressure gasification device system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115820302A (en) |
-
2022
- 2022-11-29 CN CN202211500643.3A patent/CN115820302A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7758335B2 (en) | Method for utilizing product leaks in compressor seal systems for recovery and recycling as fuel | |
| CN103215078B (en) | Pressurizing and decompressing process for coal lock by utilizing byproduct carbon dioxide gas and coaling system | |
| CN109185702B (en) | Process method of pressure reduction system | |
| CN110792866B (en) | Long-distance pipeline under-pressure plugging device and method | |
| CN115820302A (en) | Process method for pressure test of crushed coal pressure gasification device system | |
| CN214467871U (en) | Supercritical carbon dioxide cycle generator set working medium recovery system | |
| CN112797317A (en) | Working medium recovery system of supercritical carbon dioxide cycle generator set and control method | |
| CN108913202B (en) | Skid-mounted decompression system | |
| CN104165739A (en) | Method for testing pressure by adoption of vertical and automatic heat collector flow channel pressure test machine | |
| CN217003086U (en) | Air source transformation process system of dry gas sealing system of compressor | |
| CN101781580A (en) | Grading pressurization and depressurization method of pressure gasification furnace coal lock | |
| CN116293455A (en) | Natural gas emptying and recycling device, system and method based on pressure difference | |
| CN115818665A (en) | Air tightness test method of ammonia synthesis high-pressure system | |
| CN214076539U (en) | Off-line high-pressure airtight device of heavy oil hydrogenation pilot reactor | |
| CN108913217B (en) | Air supply system and air supply method of gasification furnace | |
| CN114279651A (en) | Airtightness testing system using diaphragm compressor and operation method | |
| CN211599521U (en) | Sealing flange and flexible graphite composite octagonal cushion thereof | |
| CN210153555U (en) | Oil recovery well head associated gas interlock formula piston pressure boost recovery unit | |
| CN216079325U (en) | Sealing system of propane dehydrogenation device | |
| CN202431485U (en) | Pipeline system for online oil injection of compressor | |
| CN217709334U (en) | Pressurized organic solid waste molten iron bath synthesis gas production device | |
| CN219955061U (en) | Marine LNG double-circuit gas supply system | |
| CN211372470U (en) | Airtight device for coal feeder or ash discharger | |
| CN109027691B (en) | High-pressure thermodynamic balance method of pressure reduction system | |
| CN212536012U (en) | Supercharger system with emptying gas recycling function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |