Conversion system and conversion system control method

Abstract

The present invention provides a conversion system and a conversion system control method, including a conversion furnace, a waste heat boiler, an air intake pipeline and a discharge pipeline, the inlet of the waste heat boiler is used to be connected with a raw gas supply pipeline, one end of the air intake pipeline is connected with the outlet of the waste heat boiler, the other end of the air intake pipeline is connected with the middle inlet of the conversion furnace, and the top inlet of the conversion furnace is connected with the top pipeline. The conversion system also includes: a conversion boundary valve, the conversion boundary valve is arranged on the raw gas supply pipeline to control the on-off of the conversion boundary valve; a conversion furnace crossing pipeline, the inlet of the conversion furnace crossing pipeline is used to be connected with the air intake pipeline, and the outlet of the conversion furnace crossing pipeline is connected with the discharge pipeline; a cross-line control valve, the cross-line control valve is arranged on the conversion furnace crossing pipeline to control the on-off of the conversion furnace crossing pipeline; the present invention solves the problem that the conversion system in the prior art needs to adopt more manpower operation.

Description

Technical Field

[0001] The present invention relates to the field of coal chemical industry, and in particular to a conversion system and a conversion system control method. Background Art

[0002] With the vigorous development of the coal chemical industry, most coal chemical processes use coal gasification to produce synthesis gas, and then use synthesis technology to prepare chemical products such as natural gas, olefins, methanol and oil products. Water-gas shift is an indispensable process in coal chemical technology. The principle of the shift reaction is to make CO and H2O(g) in the process gas undergo a shift reaction to generate H2 and CO2 under certain pressure and temperature conditions under the action of a catalyst.

[0003] The reaction formula is as follows:

[0004] CO+H2O=CO2+H2+Q

[0005] The shift reaction reduces the carbon monoxide content in the synthesis gas and generates more hydrogen. Therefore, the hydrogen-carbon ratio is adjusted through the shift reaction to meet different generation requirements. Therefore, water-gas shift is crucial for downstream industrial synthesis.

[0006] The shift furnace is the place where carbon monoxide reacts with water vapor. It is equipped with a sulfur-resistant shift catalyst and is an adiabatic fixed-bed reactor. During the gas-guiding process, the shift furnace is prone to overheating of the catalyst bed and large fluctuations in bed temperature due to low catalyst bed space velocity and low hydrogen-carbon ratio, thereby reducing the service life of the catalyst. Moreover, the gas-guiding of the shift furnace is currently operated manually, without automation or intelligence. Human judgment errors during the gas-guiding process can also cause the bed to overheat.

[0007] When solving the problem of overheating of the conversion furnace during gas conduction, the existing patents focus on the hardware of the conversion device and do not consider the influence of human factors. For example, the following methods can be used:

[0008] One method is to install a venting device on the venting pipeline of the conversion furnace, and pre-vent the guide gas in front of the conversion furnace, which can increase the guide gas temperature to 20-30°C higher than the dew point, solving the problems of low inlet temperature and water content, long pipe warming time, etc. during the conversion unit's guide gas, shortening the start-up time due to expiration, and extending the service life of the catalyst.

[0009] Another method is to use a carbon monoxide conversion system that can meet the active temperature requirements of the carbon monoxide reaction catalyst, avoid a large amount of carbon monoxide conversion reaction gathering at the bottom of the conversion furnace and causing over-temperature and temperature collapse in the middle and upper parts, and provide protection for the safe operation of the conversion furnace equipment.

[0010] It can be seen that the existing technologies focus on the hardware of the conversion system when solving the problem of overheating of the conversion furnace during gas conduction, and do not consider the influence of human factors. This consumes a lot of manpower, is prone to misoperation, and has low efficiency. Summary of the invention

[0011] The main purpose of the present invention is to provide a conversion system and a conversion system control method to solve the problem that the conversion system in the prior art requires a lot of manpower operation.

[0012] In order to achieve the above-mentioned object, according to one aspect of the present invention, a conversion system is provided, comprising a conversion furnace, a waste heat boiler, an air intake pipeline and a discharge pipeline, wherein the inlet of the waste heat boiler is used to communicate with the raw coal gas supply pipeline, one end of the air intake pipeline is communicated with the outlet of the waste heat boiler, the other end of the air intake pipeline is communicated with the middle inlet of the conversion furnace, the top inlet of the conversion furnace is communicated with the top pipeline, and the conversion system further comprises: a conversion boundary valve, which is arranged on the raw coal gas supply pipeline to control the on and off of the conversion boundary valve; a conversion furnace crossing pipeline, which is The inlet of the pipeline is used to connect with the air inlet pipeline, and the outlet of the converter furnace crossing pipeline is connected with the exhaust pipeline; the cross-line control valve, the cross-line control valve is arranged on the converter furnace crossing pipeline to control the on-off of the converter furnace crossing pipeline; the hot rough gas pipeline, the inlet of the hot rough gas pipeline is connected with the air inlet pipeline, and the outlet of the hot rough gas pipeline is connected with the top pipeline; the first heat exchanger, the first heat exchanger is arranged on the hot rough gas pipeline to heat the fluid in the hot rough gas pipeline; the top air inlet valve, the top air inlet valve is arranged on the hot rough gas pipeline to control the on-off of the hot rough gas pipeline.

[0013] Furthermore, the conversion system also includes: a hot crude gas thermometer, which is arranged on the hot crude gas pipeline; and / or a top inlet line thermometer, which is arranged on the top pipeline.

[0014] Furthermore, the conversion system also includes: a conversion air inlet pipeline, the inlet of the conversion air inlet pipeline is connected to the outlet of the conversion furnace, and the outlet of the conversion air inlet pipeline is connected to the inlet of the first heat exchanger; a conversion air outlet pipeline, one end of the conversion air outlet pipeline is connected to the outlet of the first converter, and the other end of the conversion air outlet pipeline is connected to the exhaust pipeline; a first conversion outlet valve, the first conversion outlet valve is arranged on the conversion air outlet pipeline to control the on-off of the conversion air outlet pipeline.

[0015] Furthermore, the conversion system also includes: a conversion furnace outlet thermometer, and the conversion furnace outlet thermometer is arranged on the conversion air inlet pipeline.

[0016] Furthermore, the conversion system also includes: a first outlet pipeline, one end of the first outlet pipeline is connected to the conversion air inlet pipeline, and the other end of the first outlet pipeline is connected to the exhaust pipeline; a first outlet valve, the first outlet valve is arranged on the first outlet pipeline to control the opening and closing of the first outlet pipeline.

[0017] Furthermore, the conversion system also includes: a second outlet pipeline, one end of the second outlet pipeline is connected to the conversion inlet pipeline, and the other end of the second outlet pipeline is connected to the exhaust pipeline; a second heat exchanger, the second heat exchanger is arranged on the second outlet pipeline; a second outlet valve, the second outlet valve is arranged on the second outlet pipeline to control the opening and closing of the second outlet pipeline.

[0018] Furthermore, the conversion system also includes: a furnace top thermometer, which is arranged at the top of the conversion furnace; and / or a furnace middle thermometer, which is arranged in the middle of the conversion furnace; and / or a furnace bottom thermometer, which is arranged at the bottom of the conversion furnace.

[0019] Furthermore, the conversion system also includes: a cold nitrogen supply pipe and a cold nitrogen on-off valve, the cold nitrogen supply pipe is connected to the top pipeline, and the cold nitrogen on-off valve is arranged on the cold nitrogen supply pipe; and / or a first flare pipeline and a first flare control valve, the inlet of the first flare pipeline is connected to the hot raw gas pipeline, and the first flare control valve is arranged on the first flare pipeline; and / or a steam pipeline, a steam control valve and a steam pressure gauge, the inlet of the steam pipeline is connected to the steam outlet of the waste heat boiler, the outlet of the steam pipeline is used to output steam, and the steam control valve and the steam pressure gauge are arranged on the steam pipeline; and / or a boiler water inlet pipe, the boiler water inlet pipe is connected to the inlet of the waste heat boiler.

[0020] Furthermore, the conversion system also includes: a gas-water separator, which is arranged on the air intake pipeline to separate the air intake pipeline into a first air intake pipe and a second air intake pipe, and the first air intake pipe is connected to the waste heat boiler; an air intake thermometer, which is arranged on the first air intake pipe; an air intake valve, which is arranged on the second air intake pipe; a condensation water outlet pipe and a condensation on-off valve, which are connected to the condensation water outlet of the gas-water separator and are connected to the condensation water outlet of the gas-water separator.

[0021] Furthermore, the conversion system also includes a raw gas flowmeter, a raw gas pressure gauge and a raw gas thermometer, which are all arranged on the raw gas supply pipeline; and / or the conversion system also includes a first discharge pipe section, a second discharge pipe section, a third discharge pipe section, a second flare control valve, a discharge valve, a heat exchange device and a discharge pressure gauge, the first discharge pipe section is connected to the conversion furnace crossing pipeline, one end of the second discharge pipe section and one end of the third discharge pipe section are both connected to the first discharge pipe section, the second flare control valve is arranged on the second discharge pipe section, the discharge valve is arranged on the third discharge pipe section, and the heat exchange device and the discharge pressure gauge are both arranged on the first discharge pipe section.

[0022] According to another aspect of the present invention, a conversion system control method is provided, which is applicable to any conversion system. The conversion system control method includes an air guide process, which includes: gradually opening the conversion boundary valve of the conversion system, and gradually connecting the discharge pipeline of the conversion system; gradually opening the top air intake valve, and gradually closing the cross-line control valve.

[0023] Furthermore, the method of opening the top air intake valve and closing the cross-line control valve includes: detecting the inlet temperature of the fluid in the top pipeline, and controlling the opening speed of the top air intake valve and the closing speed of the cross-line control valve according to the inlet temperature.

[0024] Furthermore, when the rising rate of the inlet temperature reaches 1°C / s, the top air intake valve is opened at a speed of opening one valve position every 4 seconds, and the cross-line control valve is closed at a speed of closing 8 valve positions per minute.

[0025] Further, when the rising rate of the inlet flow temperature reaches 3°C / s, the top air intake valve is opened at a speed of 1 valve position every 2 seconds, and the cross-line control valve is closed at a speed of 1 valve position every 3 seconds.

[0026] Furthermore, the method of opening the top air intake valve and closing the cross-line control valve includes: when the valve port of the cross-line control valve is closed to an opening of 20%, gradually opening the second outlet valve of the conversion system until the valve port of the second outlet valve reaches an opening of more than 10%.

[0027] Furthermore, the gas guiding process also includes: opening the valve port of the first conversion outlet valve of the conversion system to 65% to 75% to control the temperature of the fluid in the hot raw coal gas pipeline and the top pipeline to reach 210°C to 220°C.

[0028] Furthermore, the gas conduction process also includes: monitoring the middle temperature of the middle furnace body of the conversion furnace of the conversion system; when the middle temperature is greater than 250°C, opening the air intake valve of the conversion system; opening the valve mouth of the air intake valve to an opening of 10% to 20% to make the middle temperature reach 240°C to 250°C.

[0029] Furthermore, the diversion process also includes: adjusting the discharge pipeline of the conversion system to be in a conducting state so that the pressure of the discharge pipeline is 0.3 MPa lower than the pressure of the raw gas supply pipeline.

[0030] By using the conversion system and the conversion system control method of the present invention, the control system automatically controls the valve opening and closing sequence and the opening degree when the conversion furnace is conducting gas, freeing up manpower, allowing operators to have more time to pay attention to the temperature of the conversion furnace bed layer, ensuring that the conversion furnace does not overheat and the temperature fluctuation is small, reducing the impact of human factors on the overheating of the conversion furnace bed layer, and solving the problem that the conversion system in the prior art needs to use more manpower for operation. In addition, the risk of overheating of the conversion furnace is reduced, which plays a positive role in extending the service life of the conversion catalyst. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0032] Figure 1 A schematic diagram of the system structure of an embodiment of a conversion system of the present invention is shown.

[0033] The above drawings include the following reference numerals:

[0034] 1. Converter; 2. Waste heat boiler; 3. Inlet pipeline; 4. Discharge pipeline; 5. Crude gas supply pipeline; 6. Middle inlet; 7. Top inlet; 8. Top pipeline; 9. Converter boundary valve; 10. Converter crossover pipeline; 11. Crossover control valve; 12. Hot crude gas pipeline; 13. First heat exchanger; 14. Top inlet valve; 15. Hot crude gas thermometer; 16. Top inlet thermometer; 17. Converter inlet pipeline; 18. Converter outlet pipeline; 19. First converter outlet valve; 20. Converter outlet thermometer; 21. First outlet pipeline; 22. First outlet valve; 23. Second outlet pipeline; 24. Second heat exchanger; 25. Second outlet valve; 26. Furnace top thermometer; 27. Furnace middle thermometer; 2 8. Thermometer at the bottom of the furnace; 29. ​​Cold nitrogen supply pipe; 30. Cold nitrogen on-off valve; 31. The first flare pipeline; 32. The first flare control valve; 33. Steam pipeline; 34. Steam control valve; 35. Steam pressure gauge; 36. Boiler water inlet pipe; 37. Gas-water separator; 38. The first air inlet pipe; 39. The second air inlet pipe; 40. Air inlet thermometer; 41. Air inlet valve; 42. Condensate outlet pipe; 43. Condensate on-off valve; 44. Condensate outlet; 45. Crude gas flowmeter; 46. Crude gas pressure gauge; 47. Crude gas thermometer; 48. The first discharge pipe section; 49. The second discharge pipe section; 50. The third discharge pipe section; 51. The second flare control valve; 52. Discharge valve; 53. Heat exchange equipment; 54. Discharge pressure gauge. DETAILED DESCRIPTION

[0035] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0036] The present invention provides a conversion system, specifically as follows Figure 1As shown, it includes a shift converter 1, a waste heat boiler 2, an air intake pipeline 3 and a discharge pipeline 4, wherein the waste heat boiler 2 is used to adjust the water vapor ratio and temperature of the raw gas entering the shift converter 1, the inlet of the waste heat boiler 2 is used to communicate with the raw gas supply pipeline 5, one end of the air intake pipeline 3 is connected to the outlet of the waste heat boiler 2, the other end of the air intake pipeline 3 is connected to the middle inlet 6 of the shift converter 1, and the top inlet 7 of the shift converter 1 is connected to the top pipeline 8. The shift system also includes: a shift boundary valve 9, which is arranged on the raw gas supply pipeline 5 to control the switching of the shift boundary valve 9; a shift converter crossover pipeline 10, the inlet of the shift converter crossover pipeline 10 is used to The converter furnace cross-line 10 is connected to the air inlet line 3, and the outlet of the converter furnace cross-line 10 is connected to the exhaust pipeline 4; the cross-line control valve 11 is arranged on the converter furnace cross-line 10 to control the on-off of the converter furnace cross-line 10; the hot crude gas pipeline 12, the inlet of the hot crude gas pipeline 12 is connected to the air inlet line 3, and the outlet of the hot crude gas pipeline 12 is connected to the top pipeline 8; the first heat exchanger 13, the first heat exchanger 13 is arranged on the hot crude gas pipeline 12 to heat the fluid in the hot crude gas pipeline 12; the top air inlet valve 14, the top air inlet valve 14 is arranged on the hot crude gas pipeline 12 to control the on-off of the hot crude gas pipeline 12.

[0037] The conversion system of the present invention includes a conversion furnace 1, a waste heat boiler 2, an air intake pipeline 3 and a discharge pipeline 4, and also includes: a conversion boundary valve 9, a conversion furnace cross-over pipeline 10, a cross-line control valve 11, a hot crude gas pipeline 12, a first heat exchanger 13 and a top air intake valve 14. In this way, by using the automatic gas guide system of the conversion furnace of the present invention, the control system can be directly used to control the opening of the valve ports of each valve, and then control the corresponding pipeline to be connected or disconnected, so as to automatically control the conversion system to automatically guide gas, thereby freeing up manpower, allowing operators to have more time to pay attention to the temperature of the conversion furnace bed layer, and ensuring that the conversion furnace does not overheat and the temperature fluctuation is small, reducing the influence of human factors on the overheating of the conversion furnace bed layer, and solving the problem that the conversion system in the prior art needs to use more manpower to operate. In addition, the conversion system reduces the risk of overheating of the conversion furnace and plays a positive role in extending the service life of the conversion catalyst.

[0038] In order to detect the temperature of the fluid in the hot crude gas pipeline 12 more conveniently, the conversion system further comprises: a hot crude gas thermometer 15 , which is arranged on the hot crude gas pipeline 12 .

[0039] In order to detect the temperature of the fluid in the top pipeline 8 more conveniently, the conversion system further comprises a top inlet thermometer 16. The top inlet thermometer 16 is arranged on the top pipeline 8 to monitor the temperature of the hot raw coal gas.

[0040] In this embodiment, if Figure 1As shown, the conversion system also includes: a conversion air inlet pipeline 17, the inlet of the conversion air inlet pipeline 17 is connected to the outlet of the conversion furnace 1, and the outlet of the conversion air inlet pipeline 17 is connected to the inlet of the first heat exchanger 13; the first heat exchanger 13 mainly uses the hot conversion gas at the outlet of the conversion furnace to heat the raw coal gas entering the conversion furnace, a conversion air outlet pipeline 18, one end of the conversion air outlet pipeline 18 is connected to the outlet of the first heat exchanger 13, and the other end of the conversion air outlet pipeline 18 is connected to the discharge pipeline 4; a first conversion outlet valve 19, the first conversion outlet valve 19 is arranged on the conversion air outlet pipeline 18 to control the on-off of the conversion air outlet pipeline 18.

[0041] Further, the conversion system further includes: a conversion furnace outlet thermometer 20, which is arranged on the conversion inlet pipeline 17. A first outlet pipeline 21, one end of which is connected to the conversion inlet pipeline 17, and the other end of which is connected to the discharge pipeline 4; a first outlet valve 22, which is arranged on the first outlet pipeline 21 to control the on-off of the first outlet pipeline 21. A second outlet pipeline 23, one end of which is connected to the conversion inlet pipeline 17, and the other end of which is connected to the discharge pipeline 4; a second heat exchanger 24, which is used to cool the conversion gas at the conversion furnace outlet, and the second heat exchanger 24 is arranged on the second outlet pipeline 23; a second outlet valve 25, which is arranged on the second outlet pipeline 23 to control the on-off of the second outlet pipeline 23. A series of heat exchange equipment is used to continue cooling the conversion gas at the outlet of the conversion furnace until the temperature reaches 30-50°C, then it leaves the conversion boundary and is sent to the downstream device.

[0042] In this embodiment, the conversion system further includes: a furnace top thermometer 26, which is arranged at the top of the conversion furnace 1; a furnace middle thermometer 27, which is arranged at the middle of the conversion furnace 1; and a furnace bottom thermometer 28, which is arranged at the bottom of the conversion furnace 1. In this embodiment, by arranging the furnace top thermometer 26, the furnace middle thermometer 27 and the furnace bottom thermometer 28, the temperature of each part of the furnace can be monitored more conveniently.

[0043] like Figure 1As shown, the conversion system further includes: a cold nitrogen supply pipe 29 and a cold nitrogen on-off valve 30, the cold nitrogen supply pipe 29 is connected to the top pipeline 8, and the cold nitrogen on-off valve 30 is arranged on the cold nitrogen supply pipe 29; and / or a first flare pipeline 31 and a first flare control valve 32, the inlet of the first flare pipeline 31 is connected to the hot raw gas pipeline 12, and the first flare control valve 32 is arranged on the first flare pipeline 31; a steam pipeline 33, a steam control valve 34 and a steam pressure gauge 35, the inlet of the steam pipeline 33 is connected to the steam outlet of the waste heat boiler 2, the outlet of the steam pipeline 33 is used to output steam, and the steam control valve 34 and the steam pressure gauge 35 are arranged on the steam pipeline 33; a boiler water inlet pipe 36, and the boiler water inlet pipe 36 is connected to the inlet of the waste heat boiler 2. Specifically, the first flare pipeline 31 is connected to the high-pressure flare.

[0044] In this embodiment, the conversion system further includes: a gas-water separator 37, which is used to separate the raw gas from the condensate, and is arranged on the air intake line 3 to separate the air intake line 3 into a first air intake pipe 38 and a second air intake pipe 39, and the first air intake pipe 38 is connected to the waste heat boiler 2; an air intake thermometer 40, which is arranged on the first air intake pipe 38; an air intake valve 41, which is arranged on the second air intake pipe 39; a condensate outlet pipe 42 and a condensate on-off valve 43, which is connected to the condensate outlet port 44 of the gas-water separator 37, and the condensate on-off valve 43 is arranged on the condensate outlet pipe 42. In this embodiment, by arranging the gas-water separator, the raw gas and the condensate can be separated more conveniently.

[0045] In order to more conveniently measure the flow rate, pressure and temperature of the raw gas in the raw gas supply pipeline 5, the conversion system further includes a raw gas flowmeter 45, a raw gas pressure gauge 46 and a raw gas thermometer 47, and the raw gas flowmeter 45, the raw gas pressure gauge 46 and the raw gas thermometer 47 are all arranged on the raw gas supply pipeline 5; and / or the conversion system further includes a first discharge pipe section 48, a second discharge pipe section 49, a third discharge pipe section 50, a second flare control valve 51, a discharge valve 52, a heat exchange device 53 and a discharge pressure gauge 54, the first discharge pipe section 48 is connected to the conversion furnace crossing pipeline 10, one end of the second discharge pipe section 49 and one end of the third discharge pipe section 50 are both connected to the first discharge pipe section 48, the second flare control valve 51 is arranged on the second discharge pipe section 49, the discharge valve 52 is arranged on the third discharge pipe section 50, and the heat exchange device 53 and the discharge pressure gauge 54 are both arranged on the first discharge pipe section 48. Specifically, the second drain pipe section 49 is connected to the high pressure flare.

[0046] The present invention also provides a conversion system control method, which is applicable to any conversion system. The conversion system control method includes a pressure equalization process, a crude gas pipeline drainage process, a pipe heating process, a valve confirmation process and a gas guide process, wherein each process is:

[0047] Pressure equalization process: Use the control system to open the cold nitrogen on-off valve 30 (control the opening degree to 2%), the first outlet valve 22 and the cross-line control valve 11 for pressure equalization, and the pressure equalization rate is 0.1MPa / min. When the pressure of the conversion device discharge pressure gauge 54 reaches 3.5MPa, the pressure equalization ends, and the control system closes the cold nitrogen on-off valve 30, the first outlet valve 22 and the cross-line control valve 11.

[0048] Drainage process of crude gas pipeline: the control system opens the conversion boundary valve 9 (controls the opening to 2%), the cross-line control valve 11 (gradually controls the opening to 70%) and the second flare control valve 51 for drainage. The discharge pressure gauge 54 of the conversion system is controlled by the opening of the second flare control valve 51 to be lower than the inlet pressure of 460.2~0.3MPa. The condensed water of the process pipeline is discharged to the gas-water separator. When the liquid level of the gas-water separator reaches 30%, the control system opens the condensation on-off valve 43 to drain the water, and at the same time turns the condensation on-off valve 43 to automatically control the liquid level of the gas-water separator to 30%. When the crude gas thermometer 47 of the conversion device reaches 180℃, the drainage is completed, and the control system automatically closes the conversion boundary valve 9, the cross-line control valve 11 and the second flare control valve 51.

[0049] Pipe heating process: The control system slightly opens the conversion boundary valve 9 (control opening less than 3%) and the first flare control valve 32 (control opening less than 3%) to warm the pipes. The qualified standard for pipe heating is that the raw gas thermometer 47, the inlet temperature meter 40, the hot raw gas thermometer 15 and the top inlet temperature meter 16 are all between 180 and 200°C, and the pipe heating rate is 5°C / min. After the raw gas temperature rises, the waste heat boiler pressure will rise. When the steam pressure gauge 35 rises to 1.0MPa, the control system sets the steam control valve 34 to automatic, automatically controls the pressure of the waste heat boiler, and controls the water-steam ratio. After the pipe heating is completed, close the conversion boundary valve 9 and the first flare control valve 32 to prepare for automatic gas conduction.

[0050] Valve confirmation process: The control system first opens the first outlet valve 22, closes the conversion boundary valve 9, the top air inlet valve 14, the first flare control valve 32, the air inlet valve 41, the second outlet valve 25, the cold nitrogen on-off valve 30, and the second flare control valve 51, opens the first conversion outlet valve 19 to 50% opening, and opens the cross-line control valve 11 to 50% opening.

[0051] The gas introduction process includes: gradually opening the conversion boundary valve 9 of the conversion system, and gradually conducting the discharge pipeline 4 of the conversion system; gradually opening the top air intake valve 14, and gradually closing the cross-line control valve 11. At this time, the control system slowly opens the top air intake valve 14 and closes the cross-line control valve 11 at the same time to introduce the raw coal gas into the conversion furnace.

[0052] Specifically, the flow diversion process includes the first gas diversion stage and the second gas diversion stage. The first gas diversion stage includes: the control system gradually opens the conversion boundary valve 9 and the second flare control valve 51 to discharge the raw coal gas through the conversion device large span line (conversion furnace spanning pipeline 10), and controls the inlet flow rate (raw coal gas flowmeter 45) to 300,000 Nm 3 / h to ensure normal operation, the conversion furnace air velocity is 2500h -1 During the gasification, the raw coal gas from the gasifier is first introduced into the conversion device. However, at this time, the raw coal gas does not pass through the conversion furnace, but is discharged through the large span line, which is the first gas guidance stage. The key to the conversion furnace gas guidance is that the gas must pass through the conversion furnace. If it is not well controlled, the catalyst in the conversion furnace will overheat. The conversion furnace gradually passes into the conversion furnace, which is the second gas guidance stage.

[0053] The second air guiding stage includes: the control system slowly opens the top air inlet valve 14 and closes the cross-line control valve 11 at the same time.

[0054] In order to open the top air intake valve 14 and close the cross-line control valve 11 more conveniently and stably, the method of opening the top air intake valve 14 and closing the cross-line control valve 11 includes: detecting the inlet temperature of the fluid in the top pipeline 8 (the temperature detected by the top inlet thermometer 16), and controlling the opening speed of the top air intake valve 14 and the closing speed of the cross-line control valve 11 according to the inlet temperature.

[0055] When the rising rate of the inlet temperature reaches 1°C / s, the top air inlet valve 14 is opened at a rate of opening 1 valve position every 4 seconds, and the cross-line control valve 11 is closed at a rate of closing 8 valve positions per minute. It can be seen that when the inlet temperature (inlet temperature) of the conversion furnace begins to rise (the rising rate reaches 1°C / s), the system automatically speeds up the gas conduction rate, quickly opens the top air inlet valve 14 (the opening rate is 1 valve position / 4s) and closes the cross-line control valve 11 (the closing rate is 8 valve positions / min).

[0056] When the rising rate of the inlet temperature reaches 3°C / s, the top air intake valve 14 is opened at a rate of 1 valve position every 2 seconds, and the cross-line control valve 11 is closed at a rate of 1 valve position every 3 seconds. It can be seen that according to the rising rate of the inlet temperature (inlet temperature), the system adjusts the switching rate of the control valves (top air intake valve 14) and (cross-line control valve 11) at any time. When the rising rate of the inlet temperature (inlet temperature) reaches 3°C / s, the opening rate of the top air intake valve 14 is controlled to be 1 valve position / 2s, and the closing rate of the cross-line control valve 11 is controlled to be 1 valve position / 3s.

[0057] The method of opening the top air inlet valve 14 and closing the cross-line control valve 11 includes: when the cross-line control valve 11 is closed to an opening degree of 20%, gradually opening the second outflow valve 25 of the conversion system until the second outflow valve 25 reaches an opening degree of more than 10%. That is, when the valve position of the cross-line control valve 11 is closed to 20%, start to slowly open the second outflow valve 25 to more than 10%.

[0058] Furthermore, the gas guiding process further includes: opening the first conversion outlet valve 19 of the conversion system to an opening degree of 65% to 75% to control the temperature of the fluid in the hot crude gas pipeline 12 and the top pipeline 8 to reach 210° C. to 220° C. During the gas guiding process, the control system controls the detection temperature of the hot crude gas thermometer 15 and the top inlet thermometer 16 to be between 210° C. and 220° C. by opening the valve port of the first conversion outlet valve 19 to an opening degree of 65% to 75%.

[0059] Furthermore, the gas guiding process further includes: monitoring the middle temperature of the middle furnace body of the conversion furnace 1 of the conversion system; when the middle temperature is greater than 250°C, opening the air intake valve 41 of the conversion system; opening the air intake valve 41 to an opening degree of 10% to 20% so that the middle temperature reaches 240°C to 250°C. During the gas guiding process, the control system monitors the middle temperature of the conversion furnace (the temperature detected by the middle thermometer 27 of the furnace body) at any time, and when the middle temperature is greater than 250°C, opens the air intake valve 41 (the opening rate is 1 valve position / min), and ensures that the middle temperature is between 240°C and 250°C by adjusting the valve opening of the air intake valve 41 to 10-20%.

[0060] Furthermore, the diversion process also includes: controlling the discharge pipeline 4 of the conversion system to be turned on, so that the pressure of the discharge pipeline 4 is 0.3 MPa lower than the pressure of the raw gas supply pipeline 5 .

[0061] During the gas introduction process, the conversion system ensures that the conversion system outlet pressure (pressure detected by the discharge pressure gauge 54) is less than the inlet pressure (pressure detected by the raw gas pressure gauge 46) by 0.3MPa by controlling the opening of the second flare control valve 51. When the cross-line control valves 11 are all closed and the top air inlet valves 14 are all opened, the raw gas is fully connected to the conversion furnace, the automatic control system is activated, and the conversion device gas introduction is completed.

[0062] During the gas conduction process, the operator observes the temperature of the conversion furnace at any time and can manually adjust a valve at any time without affecting the system's automatic control of other valves. After appropriate adjustments, the system can be put into operation.

[0063] The various control processes of the above-mentioned automatic control steps can be carried out simultaneously, and the system can be adjusted at any time according to the temperature changes of each temperature measuring point.

[0064] The conversion system of the present invention solves the problem of overheating of the conversion furnace bed layer caused by human factors, reduces the risk of overheating of the conversion furnace, and plays a positive role in extending the service life of the conversion catalyst.

[0065] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0066] The control system of the present invention automatically controls the valve switching sequence and opening degree when the conversion furnace is conducting gas, thereby freeing up manpower and allowing operators to have more time to pay attention to the temperature of the conversion furnace bed, ensuring that the conversion furnace does not overheat and that the temperature fluctuation is small, reducing the impact of human factors on the overheating of the conversion furnace bed, reducing the risk of overheating of the conversion furnace, and playing a positive role in extending the service life of the conversion catalyst.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A conversion system, comprising a conversion furnace (1), a waste heat boiler (2), an air intake pipeline (3) and a discharge pipeline (4), wherein the inlet of the waste heat boiler (2) is used to communicate with a raw gas supply pipeline (5), one end of the air intake pipeline (3) is communicated with the outlet of the waste heat boiler (2), the other end of the air intake pipeline (3) is communicated with a middle inlet (6) of the conversion furnace (1), and the top inlet (7) of the conversion furnace (1) is communicated with a top pipeline (8), characterized in that: The transformation system further comprises: a change-boundary valve (9), the change-boundary valve (9) being arranged on the raw coal gas supply pipeline (5) to control the on-off of the change-boundary valve (9); A shift converter crossover pipeline (10), wherein the inlet of the shift converter crossover pipeline (10) is used to communicate with the air intake pipeline (3), and the outlet of the shift converter crossover pipeline (10) is communicated with the exhaust pipeline (4); A cross-line control valve (11), the cross-line control valve (11) being arranged on the converter cross-line (10) to control the on-off of the converter cross-line (10); a hot crude coal gas pipeline (12), wherein the inlet of the hot crude coal gas pipeline (12) is connected to the gas inlet pipeline (3), and the outlet of the hot crude coal gas pipeline (12) is connected to the top pipeline (8); a first heat exchanger (13), the first heat exchanger (13) being arranged on the hot raw coal gas pipeline (12) to heat the fluid in the hot raw coal gas pipeline (12); A top air inlet valve (14), the top air inlet valve (14) being arranged on the hot crude coal gas pipeline (12) to control the on-off of the hot crude coal gas pipeline (12); a conversion air intake pipeline (17), wherein the inlet of the conversion air intake pipeline (17) is connected to the outlet of the conversion furnace (1), and the outlet of the conversion air intake pipeline (17) is connected to the inlet of the first heat exchanger (13); a conversion outlet pipeline (18), one end of the conversion outlet pipeline (18) being in communication with the outlet of the first heat exchanger (13), and the other end of the conversion outlet pipeline (18) being in communication with the discharge pipeline (4); a first conversion outlet valve (19), the first conversion outlet valve (19) being arranged on the conversion outlet pipeline (18) to control the on-off of the conversion outlet pipeline (18); a first outflow pipeline (21), one end of the first outflow pipeline (21) being in communication with the conversion inlet pipeline (17), and the other end of the first outflow pipeline (21) being in communication with the discharge pipeline (4); A first outflow valve (22), wherein the first outflow valve (22) is arranged on the first outflow pipeline (21) to control the on-off of the first outflow pipeline (21).

2. The conversion system according to claim 1, characterized in that The transformation system further comprises: a hot raw gas thermometer (15), the hot raw gas thermometer (15) being arranged on the hot raw gas pipeline (12); and / or A top inlet line thermometer (16), wherein the top inlet line thermometer (16) is arranged on the top pipeline (8).

3. The conversion system according to claim 1, characterized in that The transformation system further comprises: A shift furnace outlet thermometer (20), wherein the shift furnace outlet thermometer (20) is arranged on the shift air inlet pipeline (17).

4. The conversion system according to claim 1, characterized in that The transformation system further comprises: a second outflow pipeline (23), one end of the second outflow pipeline (23) being in communication with the conversion inlet pipeline (17), and the other end of the second outflow pipeline (23) being in communication with the discharge pipeline (4); a second heat exchanger (24), the second heat exchanger (24) being arranged on the second outflow pipeline (23); A second outflow valve (25), wherein the second outflow valve (25) is arranged on the second outflow pipeline (23) to control the on-off of the second outflow pipeline (23).

5. The conversion system according to any one of claims 1 to 4, characterized in that: The transformation system further comprises: a furnace top thermometer (26), the furnace top thermometer (26) being arranged on the top of the conversion furnace (1); and / or a furnace body middle temperature meter (27), the furnace body middle temperature meter (27) being arranged in the middle of the conversion furnace (1); and / or A furnace bottom thermometer (28), wherein the furnace bottom thermometer (28) is arranged at the bottom of the conversion furnace (1).

6. The conversion system according to any one of claims 1 to 4, characterized in that: The transformation system further comprises: a cold nitrogen supply pipe (29) and a cold nitrogen on-off valve (30), wherein the cold nitrogen supply pipe (29) is connected to the top pipeline (8), and the cold nitrogen on-off valve (30) is arranged on the cold nitrogen supply pipe (29); and / or a first flare pipeline (31) and a first flare control valve (32), wherein the inlet of the first flare pipeline (31) is connected to the hot raw gas pipeline (12), and the first flare control valve (32) is arranged on the first flare pipeline (31); and / or a steam pipeline (33), a steam control valve (34) and a steam pressure gauge (35), wherein the inlet of the steam pipeline (33) is connected to the steam outlet of the waste heat boiler (2), the outlet of the steam pipeline (33) is used to output steam, and the steam control valve (34) and the steam pressure gauge (35) are arranged on the steam pipeline (33); and / or A boiler water inlet pipe (36), wherein the boiler water inlet pipe (36) is connected to the inlet of the waste heat boiler (2).

7. The conversion system according to any one of claims 1 to 4, characterized in that: The transformation system further comprises: a gas-water separator (37), the gas-water separator (37) being arranged on the air intake pipeline (3) to separate the air intake pipeline (3) into a first air intake pipe (38) and a second air intake pipe (39), the first air intake pipe (38) being connected to the waste heat boiler (2); an intake air thermometer (40), the intake air thermometer (40) being arranged on the first intake pipe (38); an air intake valve (41), the air intake valve (41) being arranged on the second air intake pipe (39); A condensation water outlet pipe (42) and a condensation on-off valve (43), wherein the condensation water outlet pipe (42) is connected to the condensation water outlet (44) of the gas-water separator (37), and the condensation on-off valve (43) is arranged on the condensation water outlet pipe (42).

8. The conversion system according to any one of claims 1 to 4, characterized in that: The conversion system further comprises a crude gas flow meter (45), a crude gas pressure gauge (46) and a crude gas thermometer (47), wherein the crude gas flow meter (45), the crude gas pressure gauge (46) and the crude gas thermometer (47) are all arranged on the crude gas supply pipeline (5); and / or The conversion system further comprises a first drain pipe section (48), a second drain pipe section (49), a third drain pipe section (50), a second flare control valve (51), a drain valve (52), a heat exchange device (53) and a drain pressure gauge (54); the first drain pipe section (48) is connected to the conversion furnace crossover pipeline (10); one end of the second drain pipe section (49) and one end of the third drain pipe section (50) are both connected to the first drain pipe section (48); the second flare control valve (51) is arranged on the second drain pipe section (49); the drain valve (52) is arranged on the third drain pipe section (50); the heat exchange device (53) and the drain pressure gauge (54) are both arranged on the first drain pipe section (48).

9. A method for controlling a conversion system, characterized in that: Applicable to the conversion system according to any one of claims 1 to 8, the conversion system control method includes a gas guiding process, and the gas guiding process includes: gradually opening the conversion boundary valve (9) of the conversion system and gradually opening the discharge pipeline (4) of the conversion system; The top air inlet valve (14) of the conversion system is gradually opened, and the cross-line control valve (11) of the conversion system is gradually closed.

10. The conversion system control method according to claim 9, characterized in that: The method of opening the top air inlet valve (14) and closing the cross-line control valve (11) comprises: The inlet temperature of the fluid in the top pipeline (8) is detected, and the opening speed of the top air inlet valve (14) and the closing speed of the cross-line control valve (11) are controlled according to the inlet temperature.

11. The conversion system control method according to claim 10, characterized in that: When the rising rate of the inlet temperature reaches 1°C / s, the top air inlet valve (14) is opened at a speed of opening one valve position every 4 seconds, and the cross-line control valve (11) is closed at a speed of closing 8 valve positions per minute.

12. The conversion system control method according to claim 10, characterized in that: When the rising rate of the inlet temperature reaches 3°C / s, the top air inlet valve (14) is opened at a speed of 1 valve position every 2 seconds, and the cross-line control valve (11) is closed at a speed of 1 valve position every 3 seconds.

13. The conversion system control method according to claim 9, characterized in that: The conversion system is the conversion system according to claim 4, and the method of opening the top air inlet valve (14) and closing the cross-line control valve (11) comprises: When the valve port of the cross-line control valve (11) is closed to an opening degree of 20%, the second outflow valve (25) of the conversion system is gradually opened until the valve port of the second outflow valve (25) reaches an opening degree of more than 10%.

14. The conversion system control method according to claim 9, characterized in that: The conversion system is the conversion system according to claim 1, and the gas conduction process further comprises: The valve port of the first conversion outlet valve (19) of the conversion system is opened to 65% to 75% to control the temperature of the fluid in the hot raw gas pipeline (12) and the top pipeline (8) to reach 210°C to 220°C.

15. The conversion system control method according to claim 9, characterized in that: The conversion system is the conversion system according to claim 7, and the gas conduction process further comprises: Monitoring the middle temperature of a middle furnace body of a conversion furnace (1) of the conversion system; When the middle temperature is greater than 250° C., opening the air inlet valve (41) of the conversion system; The valve port of the air intake valve (41) is opened to an opening of 10% to 20% so that the middle temperature reaches 240° C. to 250° C.

16. The conversion system control method according to claim 9, characterized in that: The gas conduction process also includes: The discharge pipeline (4) of the conversion system is adjusted to be in a conducting state so that the pressure of the discharge pipeline (4) is 0.3 MPa lower than the pressure of the raw coal gas supply pipeline (5).

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