Electricity-saving circulating water supply system for gasification furnace

Abstract

This invention discloses an energy-saving circulating water supply system for a gasifier, belonging to the field of coal chemical energy-saving technology. The technical problem to be solved by this invention is how to avoid high-pressure operation of the entire circulating water system, improve heat exchange efficiency, and achieve energy saving and consumption reduction. The technical solution is as follows: a graded and pressure-divided water supply method is adopted according to the equipment elevation. The circulating water supply for the gasifier is achieved through a cooling tower, a circulating water pump, a booster pump, a primary low-level heat exchanger, a secondary low-level heat exchanger, and a tertiary high-level heat exchanger. The primary and secondary low-level heat exchangers are directly supplied with water from the cooling tower through the circulating water pump. The tertiary high-level heat exchanger is supplied with water from the cooling tower through the circulating water pump, and then pressurized again by the booster pump. When the temperature difference between the inlet and outlet of any one of the primary, secondary, or tertiary high-level heat exchangers is less than or equal to 5°C, the backwashing mode of the corresponding heat exchanger is automatically activated.

Description

Technical Field

[0001] This invention relates to the field of energy-saving technology in coal chemical industry, specifically to an energy-saving circulating water supply system for a gasifier. Background Technology

[0002] The gasifier cooling system is mainly located in the slag and water section. The main cooling equipment includes the deaerator exhaust condenser (elevation 27m), wastewater cooler (elevation 8m), vacuum flash condenser (elevation 27m), and acid gas cooler (elevation 18m). Existing circulating water systems are typically designed based on the highest point to meet the water requirements of the heat exchanger at that point. The circulating water pumps are generally selected with a high head and a certain margin. Because traditional designs select the circulating water pump head based on the highest point equipment, the overall system pressure is too high, resulting in significant energy waste. This also prolongs the operating cycle of the circulating water system, and the heat exchange surfaces are prone to accumulating silt and scale, reducing heat exchange efficiency and requiring regular online backflushing, leading to high maintenance costs.

[0003] Therefore, how to avoid high-pressure operation of the entire circulating water system, improve heat exchange efficiency, and achieve energy saving and consumption reduction are technical problems that urgently need to be solved. Summary of the Invention

[0004] The technical objective of this invention is to provide an energy-saving gasifier circulating water supply system to address the problem of how to avoid high-pressure operation of the entire circulating water system, improve heat exchange efficiency, and achieve energy conservation and consumption reduction.

[0005] The technical objective of this invention is achieved as follows: an energy-saving gasifier circulating water supply system. This system adopts a graded and pressure-divided water supply method according to the equipment elevation. The circulating water supply to the gasifier is achieved through a cooling tower, a circulating water pump, a booster pump, a primary low-level heat exchanger, a secondary low-level heat exchanger, and a tertiary high-level heat exchanger. The primary and secondary low-level heat exchangers are directly supplied with water from the cooling tower through the circulating water pump. The tertiary high-level heat exchanger is supplied with water from the cooling tower through the circulating water pump, and then pressurized again by the booster pump. When the temperature difference between the inlet and outlet of any of the three heat exchangers (primary, secondary, and tertiary elevation high-level heat exchangers) is less than or equal to 5°C, the backwash mode of the corresponding heat exchanger will be automatically activated, i.e., the low-inlet, high-outlet flushing mode. While switching the water flow direction, the mobile ultrasonic cleaner will remove the deposits in the corresponding heat exchanger. When the temperature difference between the inlet and outlet of any of the primary, secondary, or tertiary high-level heat exchangers exceeds 5°C, the normal operating mode is restored, and the water flow direction is high inlet and low outlet, that is, the circulating water enters from the upper part and exits from the lower part of the primary, secondary, or tertiary high-level heat exchangers.

[0006] Preferably, the primary elevation low-level heat exchanger is a wastewater cooler, and the mobile ultrasonic cleaner is installed below the wastewater cooler. The cooling tower is connected to the inlet end of the circulating water pump via the inlet pipeline of the circulating water pump. The outlet end of the circulating water pump is connected to the inlet pipeline of the wastewater cooler via the outlet pipeline of the circulating water pump. The inlet pipeline of the wastewater cooler is connected to the inlet end of the wastewater cooler. The outlet end of the wastewater cooler is equipped with a wastewater cooler outlet pipeline, which is connected to the cooling tower via the inlet pipeline of the cooling tower. The wastewater cooler inlet pipeline is equipped with a wastewater cooler forward flow inlet electric valve, and the wastewater cooler outlet pipeline is equipped with a wastewater cooler forward flow outlet electric valve.

[0007] More preferably, a wastewater cooler inlet and outlet water connecting pipeline is provided between the wastewater cooler inlet pipeline and the wastewater cooler outlet pipeline, and a wastewater cooler inlet and outlet water connecting valve is provided on the wastewater cooler inlet and outlet water connecting pipeline. A wastewater cooler reverse flow inlet pipeline is installed between the circulating water pump outlet pipeline and the wastewater cooler outlet pipeline, and a wastewater cooler reverse flow inlet electric valve is installed on the wastewater cooler reverse flow inlet pipeline; a wastewater cooler reverse flow outlet pipeline is installed between the wastewater cooler inlet pipeline and the cooling tower inlet pipeline, and a wastewater cooler reverse flow outlet electric valve is installed on the wastewater cooler reverse flow outlet pipeline.

[0008] Preferably, the secondary elevation low-level heat exchanger is an acid gas condenser, and the mobile ultrasonic cleaner is installed below the acid gas condenser. The outlet pipeline of the circulating water pump is connected to the inlet pipeline of the acid gas condenser. The inlet pipeline of the acid gas condenser is connected to the inlet end of the acid gas condenser. The outlet end of the acid gas condenser is equipped with an outlet pipeline of the acid gas condenser, which is connected to the inlet pipeline of the cooling tower. Among them, an electric valve for the positive flow outlet of the acid gas condenser is installed on the water outlet pipeline of the acid gas condenser, and an electric valve for the positive flow inlet of the acid gas condenser is installed on the water inlet pipeline of the acid gas condenser.

[0009] Preferably, an acid gas condenser inlet / outlet water connecting pipeline is provided between the acid gas condenser inlet water pipeline and the acid gas condenser outlet water pipeline, and an acid gas condenser inlet / outlet water connecting valve is provided on the acid gas condenser inlet / outlet water connecting pipeline. A reverse flow inlet pipeline for the acid gas condenser is installed between the outlet pipeline of the acid gas condenser and the outlet pipeline of the circulating water pump, and an electric valve for the reverse flow inlet of the acid gas condenser is installed on the reverse flow inlet pipeline; a reverse flow outlet pipeline for the acid gas condenser is installed between the inlet pipeline of the acid gas condenser and the inlet pipeline of the cooling tower, and an electric valve for the reverse flow outlet of the acid gas condenser is installed on the reverse flow outlet pipeline.

[0010] As a preferred option, the three-stage high-level heat exchanger adopts a deaerator exhaust cooler and a vacuum flash condenser, with the mobile ultrasonic cleaner installed below the deaerator exhaust cooler and the vacuum flash condenser respectively. The circulating water pump outlet pipeline is connected to the booster pump inlet pipeline, which is connected to the inlet end of the booster pump. The booster pump outlet end is equipped with a booster pump outlet pipeline, which is connected to the deaerator exhaust cooler inlet pipeline and the vacuum flash condenser inlet pipeline respectively. The deaerator exhaust cooler inlet pipeline is connected to the inlet end of the deaerator exhaust cooler, and the deaerator exhaust cooler outlet pipeline is installed at the outlet end of the deaerator exhaust cooler, which is connected to the cooling tower inlet pipeline; an inlet / outlet connecting pipeline for the deaerator exhaust cooler is installed between the deaerator exhaust cooler inlet pipeline and the deaerator exhaust cooler outlet pipeline, and an electric valve for connecting the deaerator exhaust cooler inlet / outlet is installed on the deaerator exhaust cooler inlet / outlet connecting pipeline; The vacuum flash condenser inlet water line is connected to the inlet end of the vacuum flash condenser, and the vacuum flash condenser outlet water line is installed at the outlet end of the vacuum flash condenser. The vacuum flash condenser outlet water line is connected to the cooling tower inlet water line. A vacuum flash condenser inlet and outlet water connecting line is installed between the vacuum flash condenser inlet water line and the vacuum flash condenser outlet water line, and a vacuum flash condenser inlet and outlet water connecting electric valve is installed on the vacuum flash condenser inlet and outlet water connecting line. A booster pump inlet electric valve is installed on the booster pump inlet pipeline; a booster pump outlet electric valve is installed on the booster pump outlet pipeline; a deaerator exhaust cooler inlet electric valve is installed on the deaerator exhaust cooler outlet water pipeline, and a deaerator exhaust cooler outlet electric valve is installed on the deaerator exhaust cooler outlet water pipeline; a vacuum flash condenser inlet electric valve is installed on the vacuum flash condenser outlet water pipeline, and a vacuum flash condenser outlet electric valve is installed on the vacuum flash condenser outlet water pipeline.

[0011] Preferably, a three-stage elevation reverse flow water outlet pipeline is provided between the deaerator exhaust cooler inlet pipeline and the vacuum flash condenser inlet pipeline. A deaerator exhaust cooler reverse flow outlet electric valve is provided at the end of the three-stage elevation reverse flow water outlet pipeline near the deaerator exhaust cooler inlet pipeline, and a vacuum flash condenser reverse flow outlet electric valve is provided on the side of the three-stage elevation reverse flow water outlet pipeline near the vacuum flash condenser inlet pipeline. A three-stage elevation reverse flow inlet water pipeline is installed between the deaerator exhaust cooler outlet water pipeline and the vacuum flash condenser outlet water pipeline. The deaerator exhaust cooler reverse flow inlet electric valve is installed at the end of the three-stage elevation reverse flow inlet water pipeline closest to the deaerator exhaust cooler outlet water pipeline, and the vacuum flash condenser reverse flow inlet electric valve is installed on the side of the three-stage elevation reverse flow inlet water pipeline closest to the vacuum flash condenser outlet water pipeline.

[0012] More preferably, the normal operating mode of this system is as follows: (1) After receiving the start command, the system opens the electric valve at the inlet of the circulating water pump to ensure that the inlet pipeline is unobstructed; (2) After 3-7 minutes, preferably 5 minutes, start the circulating water pumps sequentially to establish circulating water pressure; (3) After 30-90 seconds, preferably after 60 seconds, open the electric valve at the outlet of the circulating water pump to send the circulating water into the outlet pipeline of the circulating water pump. (4) After 1-3 minutes, preferably after 2 minutes, open the inlet electric valve of the wastewater cooler, the inlet electric valve of the acid gas condenser and the inlet electric valve of the booster pump in sequence. (5) After 1-5 minutes, preferably after 3 minutes, open the electric valve at the outlet of the wastewater cooler and the electric valve at the outlet of the acid gas condenser. (6) After 3-7 minutes, preferably after 5 minutes, start the booster pump to increase the water supply pressure to meet the requirements of the three-stage high-level heat exchanger; (7) After 30-90 seconds, preferably after 60 seconds, open the electric valve at the outlet of the booster pump; (8) After 1-3 minutes, preferably after 2 minutes, open the electric valve at the inlet of the deaerator exhaust condenser and the electric valve at the inlet of the vacuum flash condenser. (9) After 1-5 minutes, preferably after 3 minutes, open the electric valve at the outlet of the deaerator exhaust condenser and the electric valve at the outlet of the vacuum flash condenser. (10) At this point, the system enters a stable forward flow operation state. The circulating water passes through the wastewater cooler, acid gas condenser, deaerator exhaust condenser and vacuum flash condenser in sequence. After completing the cooling task, it returns to the cooling tower for cooling and enters the next cycle.

[0013] More preferably, the backwashing process of the wastewater cooler is as follows: (1) When the temperature difference between the inlet and outlet of the wastewater cooler is less than or equal to 5°C, the reverse process is triggered; (2) Open the inlet electric valve and outlet electric valve of the wastewater cooler in sequence; (3) After confirming that the electric valve at the inlet of the wastewater cooler and the electric valve at the outlet of the wastewater cooler are fully open, close the electric valve at the inlet of the wastewater cooler and the electric valve at the outlet of the wastewater cooler in sequence. (4) Start the mobile ultrasonic cleaner in sequence, work at a speed of 0.5 meters per minute, and complete 5 cycles; (5) After the switching is completed, the water flow direction changes to "low inlet and high outlet" to perform reverse flushing of the inside of the wastewater cooler; The backwashing process of the acid gas condenser, deaerator exhaust condenser, and vacuum flash condenser is the same as that of the wastewater cooler backwashing process.

[0014] More preferably, the process for the wastewater cooler to return to normal working mode is as follows: (1) Open the electric valve at the inlet of the wastewater cooler and the electric valve at the outlet of the wastewater cooler; (2) After confirming that the electric valve at the inlet of the wastewater cooler and the electric valve at the outlet of the wastewater cooler are fully open, close the electric valve at the inlet of the wastewater cooler and the electric valve at the outlet of the wastewater cooler in sequence. (3) Turn off the mobile ultrasonic cleaner in sequence and return the ultrasonic cleaner to its initial position; (4) At this point, the wastewater cooler has returned to its normal operating state of "high inlet, low outlet"; The process of restoring the acid gas condenser, deaerator exhaust condenser, and vacuum flash condenser to normal working mode is the same as that of restoring the wastewater cooler to normal working mode.

[0015] The energy-saving gasifier circulating water supply system of the present invention has the following advantages: This invention employs a graded and pressure-controlled precise water supply method. Based on the water demand of equipment at different elevations, circulating water pumps and booster pumps are set up separately to rationally allocate water supply pressure. The start and stop of the booster pumps are adjusted according to the actual operating load to achieve dynamic energy-saving control. This combines low-pressure water supply with localized pressurization, significantly reducing the total energy consumption of the system. Taking a 1500t / day coal-water slurry gasification furnace as an example, this invention saves approximately 50% of electricity compared to traditional designs. Simultaneously, this invention combines automatic electric valve control with an ultrasonic cleaner (based on the "cavitation effect" generated by ultrasound in liquids, using the instantaneous high pressure, high temperature, and high-speed micro-jet generated when bubbles burst to impact the surface of objects, thereby removing dirt) to achieve forward and reverse flow switching of circulating water, thereby improving heat exchange efficiency, preventing scaling, and reducing energy consumption.

[0016] Therefore, this invention has the characteristics of reasonable design, simple structure, easy processing, small size, convenient use, and multiple uses, and thus has great value for promotion and use. Attached Figure Description

[0017] The invention will be further described below with reference to the accompanying drawings.

[0018] Appendix Figure 1 A schematic diagram of the circulating water supply system for an energy-saving gasifier.

[0019] In the diagram: 1. Circulating water pump inlet pipeline; 2. Circulating water pump; 3. Circulating water pump outlet pipeline; 4. Wastewater cooler inlet pipeline; 5. Acid gas condenser inlet pipeline; 6. Booster pump inlet pipeline; 7. Booster pump; 8. Booster pump outlet pipeline; 9. Deaerator exhaust condenser inlet pipeline; 10. Vacuum flash condenser inlet pipeline; 11. Wastewater cooler outlet pipeline; 12. Acid gas condenser outlet pipeline; 13. Deaerator exhaust condenser outlet pipeline; 14. Vacuum flash condenser outlet pipeline; 15. Cooling tower inlet pipeline; 16. Wastewater cooler; 17. Acid gas condenser; 18. Deaerator. 19. Wastewater cooler exhaust condenser; 20. Vacuum flash condenser; 21. Cooling tower; 22. Wastewater cooler inlet and outlet water connection pipeline; 23. Acid gas condenser inlet and outlet water connection pipeline; 24. Deaerator exhaust condenser inlet and outlet water connection pipeline; 25. Vacuum flash condenser inlet and outlet water connection pipeline; 26. Circulating water pump inlet electric valve; 27. Circulating water pump outlet electric valve; 28. Wastewater cooler forward flow inlet electric valve; 29. ​​Wastewater cooler forward flow outlet electric valve; 30. Wastewater cooler reverse flow inlet electric valve; 31. Acid gas condenser forward flow inlet electric valve. 32. Acid gas condenser forward flow outlet electric valve; 33. Acid gas condenser reverse flow inlet electric valve; 34. Acid gas condenser reverse flow outlet electric valve; 35. Booster pump inlet electric valve; 36. Booster pump outlet electric valve; 37. Deaerator exhaust condenser forward flow inlet electric valve; 38. Deaerator exhaust condenser forward flow outlet electric valve; 39. Deaerator exhaust condenser reverse flow inlet electric valve; 40. Deaerator exhaust condenser reverse flow outlet electric valve; 41. Vacuum flash condenser forward flow inlet electric valve; 42. Vacuum flash condenser forward flow outlet electric valve; 43. Vacuum flash condenser. 44. Reverse flow inlet electric valve; 45. Vacuum flash condenser reverse flow outlet electric valve; 46. Mobile ultrasonic cleaner; 47. Wastewater cooler inlet / outlet water connecting valve; 48. Wastewater cooler reverse flow inlet pipeline; 49. Wastewater cooler reverse flow outlet pipeline; 50. Acid gas condenser inlet / outlet water connecting valve; 51. Acid gas condenser reverse flow inlet pipeline; 52. Deaerator exhaust cooler inlet / outlet connecting electric valve; 53. Vacuum flash condenser inlet / outlet water connecting electric valve; 54. Level 3 elevation reverse flow outlet pipeline; 55. Level 3 elevation reverse flow inlet pipeline. Detailed Implementation

[0020] The following detailed description of an energy-saving gasifier circulating water supply system of the present invention is based on the accompanying drawings and specific embodiments.

[0021] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Example

[0023] As attached Figure 1 As shown, this embodiment provides an energy-saving gasifier circulating water supply system. The system adopts a graded and pressure-divided water supply method according to the equipment elevation. The circulating water supply to the gasifier is achieved through a cooling tower 20, a circulating water pump 2, a booster pump 7, a first-stage low-level heat exchanger, a second-stage low-level heat exchanger, and a third-stage high-level heat exchanger. The first-stage and second-stage low-level heat exchangers are directly supplied with water from the cooling tower 20 through the circulating water pump 2. The third-stage high-level heat exchanger is supplied with water from the cooling tower 20 through the circulating water pump 2, and then pressurized again by the booster pump 7. When the temperature difference between the inlet and outlet of any of the three heat exchangers (first-stage, second-stage, and third-stage) is less than or equal to 5°C, the backwash mode of the corresponding heat exchanger is automatically activated, i.e., the low-inlet, high-outlet flushing mode. While switching the water flow direction, the mobile ultrasonic cleaner 45 removes the deposits in the corresponding heat exchanger. When the temperature difference between the inlet and outlet of any of the primary, secondary, or tertiary high-level heat exchangers exceeds 5°C, the normal operating mode is restored, and the water flow direction is high inlet and low outlet, that is, the circulating water enters from the upper part and exits from the lower part of the primary, secondary, or tertiary high-level heat exchangers.

[0024] This embodiment covers multiple heat exchanger devices located at different elevations. Through a tiered water supply design, combined with automatic control of electric valves and an ultrasonic cleaner 45, the water supply pressure is rationally allocated according to the water demand of devices at different elevations, reducing system energy consumption and enabling the switching of forward and reverse flow of circulating water to improve heat exchange efficiency, prevent scaling, and reduce energy consumption.

[0025] During operation of this embodiment, circulating water pump 2 provides basic water supply pressure to meet the needs of low-elevation equipment; booster pump is only started when equipment at an elevation of 27m is running, avoiding high-pressure operation of the entire system and achieving energy saving.

[0026] In this embodiment, the primary low-level heat exchanger is a wastewater cooler 16 with an elevation of 8m. A mobile ultrasonic cleaner 45 is installed below the wastewater cooler 16. The cooling tower 20 is connected to the inlet end of the circulating water pump 2 through the circulating water pump inlet pipeline 1. The outlet end of the circulating water pump 2 is connected to the wastewater cooler inlet pipeline 4 through the circulating water pump outlet pipeline 3. The wastewater cooler inlet pipeline 4 is connected to the inlet end of the wastewater cooler 16. The outlet end of the wastewater cooler 16 is equipped with a wastewater cooler outlet pipeline 11. The wastewater cooler outlet pipeline 11 is connected to the cooling tower 20 through the cooling tower inlet pipeline 15. Among them, the wastewater cooler inlet pipeline 4 is equipped with a wastewater cooler forward flow inlet electric valve 27, and the wastewater cooler outlet pipeline 11 is equipped with a wastewater cooler forward flow outlet electric valve 28.

[0027] In this embodiment, a wastewater cooler inlet / outlet connecting pipeline 21 is installed between the wastewater cooler inlet pipeline 4 and the wastewater cooler outlet pipeline 11, and a wastewater cooler inlet / outlet connecting valve 46 is installed on the wastewater cooler inlet / outlet connecting pipeline 21; a wastewater cooler reverse flow inlet pipeline 47 is installed between the circulating water pump outlet pipeline 3 and the wastewater cooler outlet pipeline 11, and a wastewater cooler reverse flow inlet electric valve 29 is installed on the wastewater cooler reverse flow inlet pipeline 48; a wastewater cooler reverse flow outlet pipeline 48 is installed between the wastewater cooler inlet pipeline 4 and the cooling tower inlet pipeline 15, and a wastewater cooler reverse flow outlet electric valve 30 is installed on the wastewater cooler reverse flow outlet pipeline 48.

[0028] In this embodiment, the secondary elevation low-level heat exchanger is an acid gas condenser 17 with an elevation of 18m, and the mobile ultrasonic cleaner 45 is installed below the acid gas condenser 17. The circulating water pump outlet pipeline 3 is connected to the acid gas condenser inlet pipeline 5. The acid gas condenser inlet pipeline 5 is connected to the inlet end of the acid gas condenser 17. The acid gas condenser outlet pipeline 12 is installed at the outlet end of the acid gas condenser 17. The acid gas condenser outlet pipeline 12 is connected to the cooling tower inlet pipeline 15. Among them, the acid gas condenser outlet pipeline 12 is equipped with an acid gas condenser forward flow outlet electric valve 32, and the acid gas condenser inlet pipeline 5 is equipped with an acid gas condenser forward flow inlet electric valve 31.

[0029] In this embodiment, an acid gas condenser inlet / outlet water connecting pipeline 22 is installed between the acid gas condenser inlet water pipeline 5 and the acid gas condenser outlet water pipeline 12, and an acid gas condenser inlet / outlet water connecting valve 49 is installed on the acid gas condenser inlet / outlet water connecting pipeline 22; an acid gas condenser reverse flow inlet water pipeline 50 is installed between the acid gas condenser outlet water pipeline 12 and the circulating water pump outlet pipeline 3, and an acid gas condenser reverse flow inlet electric valve 33 is installed on the acid gas condenser reverse flow inlet water pipeline 50; an acid gas condenser reverse flow outlet water pipeline 51 is installed between the acid gas condenser inlet water pipeline 5 and the cooling tower inlet water pipeline 15, and an acid gas condenser reverse flow outlet electric valve 34 is installed on the acid gas condenser reverse flow outlet water pipeline 51.

[0030] In this embodiment, the three-stage high-level heat exchanger uses a deaerator exhaust cooler 18 and a vacuum flash condenser 19 at an elevation of 27m. A mobile ultrasonic cleaner 45 is installed below the deaerator exhaust cooler 18 and the vacuum flash condenser 19, respectively. The circulating water pump outlet pipeline 3 is connected to the booster pump inlet pipeline 6, which is connected to the inlet end of the booster pump 7. The booster pump 7 outlet end is connected to the booster pump outlet pipeline 8, which is connected to the deaerator exhaust cooler inlet pipeline 9 and the vacuum flash condenser inlet pipeline 10, respectively. In this system, the deaerator exhaust cooler inlet water pipeline 9 is connected to the inlet end of the deaerator exhaust cooler 18, and the deaerator exhaust cooler outlet water pipeline 13 is installed at the outlet end of the deaerator exhaust cooler 18. The deaerator exhaust cooler outlet water pipeline 13 is connected to the cooling tower inlet water pipeline 15. A deaerator exhaust cooler inlet and outlet connecting pipeline 23 is installed between the deaerator exhaust cooler inlet water pipeline 9 and the deaerator exhaust cooler outlet water pipeline 13, and a deaerator exhaust cooler inlet and outlet connecting electric valve 52 is installed on the deaerator exhaust cooler inlet and outlet connecting pipeline 23. The vacuum flash condenser inlet water line 10 is connected to the inlet end of the vacuum flash condenser 19. The vacuum flash condenser outlet water line 14 is installed at the outlet end of the vacuum flash condenser 19. The vacuum flash condenser outlet water line 14 is connected to the cooling tower inlet water line 15. A vacuum flash condenser inlet and outlet water connecting line 24 is installed between the vacuum flash condenser inlet water line 10 and the vacuum flash condenser outlet water line 14. A vacuum flash condenser inlet and outlet water connecting electric valve 53 is installed on the vacuum flash condenser inlet and outlet water connecting line 24. A booster pump inlet electric valve 35 is installed on the booster pump inlet pipeline 6; a booster pump outlet electric valve 36 is installed on the booster pump outlet pipeline 8; a deaerator exhaust cooler inlet electric valve 37 is installed on the deaerator exhaust cooler forward flow electric valve 9; a deaerator exhaust cooler outlet electric valve 38 is installed on the deaerator exhaust cooler forward flow electric valve 13; a vacuum flash condenser inlet electric valve 41 is installed on the vacuum flash condenser forward flow electric valve 10; and a vacuum flash condenser outlet electric valve 42 is installed on the vacuum flash condenser forward flow electric valve 14.

[0031] In this embodiment, a three-stage elevation reverse flow water outlet pipeline 54 is installed between the deaerator exhaust cooler inlet water pipeline 9 and the vacuum flash condenser inlet water pipeline 10. A deaerator exhaust cooler reverse flow outlet electric valve 40 is installed at one end of the three-stage elevation reverse flow outlet pipeline 54 near the deaerator exhaust cooler inlet water pipeline 9, and a vacuum flash condenser reverse flow outlet electric valve 44 is installed on the side of the three-stage elevation reverse flow outlet pipeline 54 near the vacuum flash condenser inlet water pipeline 10. A three-stage elevation reverse flow inlet water pipeline 55 is installed between the deaerator exhaust cooler outlet water pipeline 13 and the vacuum flash condenser outlet water pipeline 14. A deaerator exhaust cooler reverse flow inlet electric valve 39 is installed at the end of the three-stage elevation reverse flow inlet water pipeline 55 closest to the deaerator exhaust cooler outlet water pipeline 13, and a vacuum flash condenser reverse flow inlet electric valve 43 is installed on the side of the three-stage elevation reverse flow inlet water pipeline 55 closest to the vacuum flash condenser outlet water pipeline 14.

[0032] The normal operating mode of this embodiment is as follows: (1) After receiving the start command, the system opens the electric valve 25 at the inlet of the circulating water pump to ensure that the inlet pipeline is unobstructed; (2) After 5 minutes, start circulating water pump 2 in sequence to establish circulating water pressure; (3) After 60 seconds, open the electric valve 26 at the outlet of the circulating water pump to send the circulating water into the outlet pipeline 3 of the circulating water pump. (4) After 2 minutes, open the wastewater cooler inlet electric valve 27, the acid gas condenser inlet electric valve 31 and the booster pump inlet electric valve 35 in sequence. (5) After 3 minutes, open the electric valve 28 at the outlet of the wastewater cooler and the electric valve 32 at the outlet of the acid gas condenser. (6) After 5 minutes, start the booster pump 7 to increase the water supply pressure to meet the requirements of the three-stage high-level heat exchanger; (7) After 60 seconds, open the booster pump outlet electric valve 36; (8) After 2 minutes, open the electric valve 37 of the deaerator exhaust condenser and the electric valve 41 of the vacuum flash condenser. (9) After 3 minutes, open the electric valve 38 of the deaerator exhaust condenser forward flow outlet and the electric valve 42 of the vacuum flash condenser forward flow outlet. (10) At this point, this embodiment enters the stable operation state of the forward process. The circulating water passes through the wastewater cooler 16, the acid gas condenser 17, the deaerator exhaust condenser 18 and the vacuum flash condenser 19 in sequence. After completing the cooling task, it returns to the cooling tower 20 for cooling and enters the next cycle.

[0033] The backwashing process of the wastewater cooler in this embodiment is as follows: (1) When the temperature difference between the inlet and outlet of the wastewater cooler 16 is less than or equal to 5°C, the reverse process is triggered; (2) Open the wastewater cooler reverse flow inlet electric valve 29 and the wastewater cooler reverse flow outlet electric valve 28 in sequence; (3) After confirming that the wastewater cooler reverse flow inlet electric valve 29 and the wastewater cooler reverse flow outlet electric valve 28 are fully open, close the wastewater cooler forward flow inlet electric valve 27 and the wastewater cooler forward flow outlet electric valve 28 in sequence. (4) Start the mobile ultrasonic cleaner 45 in sequence, work at a speed of 0.5 meters per minute, and complete 5 cycles; (5) After the switching is completed, the water flow direction changes to "low inlet and high outlet" to perform reverse flushing of the inside of the wastewater cooler 16; The working process of the reverse flushing mode of the acid gas condenser 17 is as follows: open the reverse flow inlet electric valve 33 and the reverse flow outlet electric valve 34 of the acid gas condenser → close the forward flow inlet electric valve 31 and the forward flow outlet electric valve 32 of the acid gas condenser.

[0034] The working process of the reverse flushing mode of the deaerator exhaust condenser 18 is as follows: open the deaerator exhaust condenser reverse flow inlet electric valve 39 and the deaerator exhaust condenser reverse flow outlet electric valve 40 → close the deaerator exhaust condenser forward flow inlet electric valve 37 and the deaerator exhaust condenser forward flow outlet electric valve 38.

[0035] The working process of the reverse flushing mode of vacuum flash condenser 19 is as follows: open the vacuum flash condenser reverse flow inlet electric valve 43 and vacuum flash condenser reverse flow outlet electric valve 44 → close the vacuum flash condenser forward flow inlet electric valve 41 and vacuum flash condenser forward flow outlet electric valve 42.

[0036] The process of restoring the wastewater cooler 16 to normal working mode in this embodiment is as follows: (1) Open the electric valve 27 at the inlet of the wastewater cooler and the electric valve 28 at the outlet of the wastewater cooler; (2) After confirming that the electric valve 27 at the inlet of the wastewater cooler and the electric valve 28 at the outlet of the wastewater cooler are fully open, close the electric valve 29 at the inlet of the wastewater cooler and the electric valve 30 at the outlet of the wastewater cooler in sequence. (3) The mobile ultrasonic cleaner 45 is turned off in sequence and the ultrasonic cleaner 45 returns to its initial position. (4) At this point, the wastewater cooler 16 is restored to the normal operating state of "high inlet, low outlet"; The process of restoring the acid gas condenser 17, the deaerator exhaust condenser 18, and the vacuum flash condenser 19 to normal working mode is the same as the process of restoring the wastewater cooler 16 to normal working mode.

[0037] In this embodiment, the circulating water pump 2 is selected with a capacity of 7000 m³ / h, a head of 20 m, and a motor power of 500 kW; the booster pump 7 is selected with a capacity of 3500 m³ / h, a head of 15 m, and a motor power of 200 kW. The outlet pressure of the circulating water pump is designed to meet the requirements of equipment at elevations of 18 m and 8 m. Equipment at an elevation of 27 m is supplied with water through secondary pressurization via the booster pump. Taking a 1500 t / day coal-water slurry gasification furnace as an example, the circulating water pump 2 is selected with a capacity of 7000 m³ / h and a head of 20 m, and the booster pump 7 is selected with a capacity of 3500 m³ / h and a head of 15 m, with a total power of 700 kW, saving 50% of electricity compared to the traditional design.

[0038] All valves in this embodiment are electrically controlled and support remote automatic operation. The ultrasonic waves generated in the liquid by the ultrasonic cleaner create a "cavitation effect," which removes dirt by impacting the object surface with instantaneous high pressure, high temperature, and high-speed micro-jet when bubbles burst. The circulating water pump in this embodiment uses frequency conversion regulation to adapt to different load requirements.

[0039] In this embodiment, the inlet and outlet of the heat exchangers, including the wastewater cooler 16, the acid gas condenser 17, the deaerator exhaust condenser 18, and the vacuum flash condenser 19, are equipped with pressure, temperature, and flow measurement points to provide data support for system judgment.

[0040] In this embodiment, the wastewater cooler inlet / outlet water connection line 21, the acid gas condenser inlet / outlet water connection line 22, the deaerator exhaust condenser inlet / outlet water connection line 23, and the vacuum flash condenser inlet / outlet water connection line 24 all have antifreeze and backwashing functions. Furthermore, this embodiment supports one-button start and one-button stop, demonstrating a high level of automation.

[0041] This embodiment can achieve constant water volume and pressure, precise water supply, and variable water direction. Taking a 1500t / day water-coal slurry gasification furnace as an example, the specific details are as follows: Deaerator exhaust condenser 18 (elevation 27m): water demand is about 200m³ / h, and the circulating water pipeline is designed to be DN200mm; Wastewater cooler 16 (elevation 8m): water demand is about 500m³ / h, and the circulating water pipeline is designed to be DN350mm. Vacuum flash condenser 19 (elevation 27m): water demand is about 1500m³ / h, and the circulating water pipeline is designed to be DN600mm; Acid gas cooler 17 (elevation 18m): water demand is about 1000m³ / h, the circulating water pipeline is designed to be DN500mm, the main circulating water pipe is designed to be DN1000mm, and the flow velocity of the circulating water pipeline is taken as 1.5m / s. The total circulating water requirement for a single gasifier during normal operation is 3200 m³ / h, and the water requirement for two systems is 5700 m³ / h.

[0042] The selected circulating water pump 2 has a capacity of 8000 m³ / h, a head of 50 m, and a motor power of 1400 KW. Meanwhile, the equipment location and elevation characteristics are as follows: The 27-meter elevation is for the deaerator exhaust condenser 18 and the vacuum flash condenser 19. The circulating water volume required for a single system is 1700 m³ / h, and the water volume required for two systems is 3200 m³ / h.

[0043] The 18-meter elevation is for acid gas cooler 17. A single system requires 1000 m³ / h of circulating water, and two systems require 2000 m³ / h of water.

[0044] The 8-meter elevation is for wastewater cooler 16. A single system requires a circulating water volume of 500 m³ / h, and two systems also require a water volume of 500 m³ / h (1 in use and 1 on standby).

[0045] Considering a two-stage pressure-controlled water supply design, the circulating water pump 2 is selected with a capacity of 7000 m³ / h (a reduction of 1000 m³ / h compared to the original design), a head of 20 m, and an outlet pressure of 0.25 MPa. It supplies water to the acid gas cooler at an elevation of 18 meters and also to the wastewater cooler 16 at an elevation of 8 meters. The calculated motor power is 500 kW. The secondary water supply uses booster pump 7, with a capacity of 3500 m³ / h, a head of 15 m, and a calculated motor power of 200 kW. The total motor power is 700 kW (a reduction of 700 kW / h in electricity consumption compared to the original design).

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A power-saving gasifier circulating water supply system, characterized in that, The system adopts a graded and pressure-divided water supply method according to the equipment elevation. It supplies circulating water to the gasifier through a cooling tower, circulating water pump, booster pump, primary elevation low-level heat exchanger, secondary elevation low-level heat exchanger, and tertiary elevation high-level heat exchanger. The primary and secondary elevation low-level heat exchangers are directly supplied with water from the cooling tower through the circulating water pump. The tertiary elevation high-level heat exchanger is supplied with water from the cooling tower through the circulating water pump, and then pressurized again by the booster pump. When the temperature difference between the inlet and outlet of any of the three heat exchangers (primary, secondary, and tertiary elevation high-level heat exchangers) is less than or equal to 5°C, the backwash mode of the corresponding heat exchanger will be automatically activated, i.e., the low-inlet, high-outlet flushing mode. While switching the water flow direction, the mobile ultrasonic cleaner will remove the deposits in the corresponding heat exchanger. When the temperature difference between the inlet and outlet of any of the primary, secondary, or tertiary high-level heat exchangers exceeds 5°C, the normal operating mode is restored, and the water flow direction is high inlet and low outlet, that is, the circulating water enters from the upper part and exits from the lower part of the primary, secondary, or tertiary high-level heat exchangers.

2. The energy-saving gasifier circulating water supply system according to claim 1, characterized in that, The primary elevation low-level heat exchanger adopts a wastewater cooler, and the mobile ultrasonic cleaner is installed below the wastewater cooler. The cooling tower is connected to the inlet end of the circulating water pump via the inlet pipeline of the circulating water pump. The outlet end of the circulating water pump is connected to the inlet pipeline of the wastewater cooler via the outlet pipeline of the circulating water pump. The inlet pipeline of the wastewater cooler is connected to the inlet end of the wastewater cooler. The outlet end of the wastewater cooler is equipped with a wastewater cooler outlet pipeline, which is connected to the cooling tower via the inlet pipeline of the cooling tower. The wastewater cooler inlet pipeline is equipped with a wastewater cooler forward flow inlet electric valve, and the wastewater cooler outlet pipeline is equipped with a wastewater cooler forward flow outlet electric valve.

3. The energy-saving gasifier circulating water supply system according to claim 1 or 2, characterized in that, A wastewater cooler inlet and outlet water connecting pipeline is provided between the wastewater cooler inlet pipeline and the wastewater cooler outlet pipeline, and a wastewater cooler inlet and outlet water connecting valve is provided on the wastewater cooler inlet and outlet water connecting pipeline. A wastewater cooler reverse flow inlet pipeline is installed between the circulating water pump outlet pipeline and the wastewater cooler outlet pipeline, and a wastewater cooler reverse flow inlet electric valve is installed on the wastewater cooler reverse flow inlet pipeline; a wastewater cooler reverse flow outlet pipeline is installed between the wastewater cooler inlet pipeline and the cooling tower inlet pipeline, and a wastewater cooler reverse flow outlet electric valve is installed on the wastewater cooler reverse flow outlet pipeline.

4. The energy-saving gasifier circulating water supply system according to claim 1, characterized in that, The secondary elevation low-level heat exchanger adopts an acid gas condenser, and the mobile ultrasonic cleaner is installed below the acid gas condenser. The outlet pipeline of the circulating water pump is connected to the inlet pipeline of the acid gas condenser. The inlet pipeline of the acid gas condenser is connected to the inlet end of the acid gas condenser. The outlet end of the acid gas condenser is equipped with an outlet pipeline of the acid gas condenser, which is connected to the inlet pipeline of the cooling tower. Among them, an electric valve for the positive flow outlet of the acid gas condenser is installed on the water outlet pipeline of the acid gas condenser, and an electric valve for the positive flow inlet of the acid gas condenser is installed on the water inlet pipeline of the acid gas condenser.

5. The energy-saving gasifier circulating water supply system according to claim 4, characterized in that, An acid gas condenser inlet and outlet water connecting pipeline is provided between the acid gas condenser inlet water pipeline and the acid gas condenser outlet water pipeline, and an acid gas condenser inlet and outlet water connecting valve is provided on the acid gas condenser inlet and outlet water connecting pipeline. A reverse flow inlet water pipeline for the acid gas condenser is installed between the outlet water pipeline of the acid gas condenser and the outlet water pipeline of the circulating water pump. An electric valve for the reverse flow inlet water pipeline for the acid gas condenser is installed on the reverse flow inlet water pipeline for the acid gas condenser. A reverse flow outlet water pipeline for the acid gas condenser is installed between the inlet water pipeline of the acid gas condenser and the inlet water pipeline of the cooling tower. An electric valve for the reverse flow outlet of the acid gas condenser is installed on the reverse flow outlet water pipeline of the acid gas condenser.

6. The energy-saving gasifier circulating water supply system according to claim 1, characterized in that, The three-stage high-level heat exchanger uses a deaerator exhaust cooler and a vacuum flash condenser, with a mobile ultrasonic cleaner installed below the deaerator exhaust cooler and the vacuum flash condenser, respectively. The circulating water pump outlet pipeline is connected to the booster pump inlet pipeline, which is connected to the inlet end of the booster pump. The booster pump outlet end is equipped with a booster pump outlet pipeline, which is connected to the deaerator exhaust cooler inlet pipeline and the vacuum flash condenser inlet pipeline respectively. The deaerator exhaust cooler inlet pipeline is connected to the inlet end of the deaerator exhaust cooler, and the deaerator exhaust cooler outlet pipeline is installed at the outlet end of the deaerator exhaust cooler, which is connected to the cooling tower inlet pipeline; an inlet / outlet connecting pipeline for the deaerator exhaust cooler is installed between the deaerator exhaust cooler inlet pipeline and the deaerator exhaust cooler outlet pipeline, and an electric valve for connecting the deaerator exhaust cooler inlet / outlet is installed on the deaerator exhaust cooler inlet / outlet connecting pipeline; The vacuum flash condenser inlet water line is connected to the inlet end of the vacuum flash condenser, and the vacuum flash condenser outlet water line is installed at the outlet end of the vacuum flash condenser. The vacuum flash condenser outlet water line is connected to the cooling tower inlet water line. A vacuum flash condenser inlet and outlet water connecting line is installed between the vacuum flash condenser inlet water line and the vacuum flash condenser outlet water line, and a vacuum flash condenser inlet and outlet water connecting electric valve is installed on the vacuum flash condenser inlet and outlet water connecting line. A booster pump inlet electric valve is installed on the booster pump inlet pipeline; a booster pump outlet electric valve is installed on the booster pump outlet pipeline; a deaerator exhaust cooler inlet electric valve is installed on the deaerator exhaust cooler outlet water pipeline, and a deaerator exhaust cooler outlet electric valve is installed on the deaerator exhaust cooler outlet water pipeline; a vacuum flash condenser inlet electric valve is installed on the vacuum flash condenser outlet water pipeline, and a vacuum flash condenser outlet electric valve is installed on the vacuum flash condenser outlet water pipeline.

7. The energy-saving gasifier circulating water supply system according to claim 1, characterized in that, A three-stage elevation reverse flow outlet water pipeline is installed between the deaerator exhaust cooler inlet water pipeline and the vacuum flash condenser inlet water pipeline. A deaerator exhaust cooler reverse flow outlet electric valve is installed at the end of the three-stage elevation reverse flow outlet water pipeline near the deaerator exhaust cooler inlet water pipeline, and a vacuum flash condenser reverse flow outlet electric valve is installed on the side of the three-stage elevation reverse flow outlet water pipeline near the vacuum flash condenser inlet water pipeline. A three-stage elevation reverse flow inlet water pipeline is installed between the deaerator exhaust cooler outlet water pipeline and the vacuum flash condenser outlet water pipeline. The deaerator exhaust cooler reverse flow inlet electric valve is installed at the end of the three-stage elevation reverse flow inlet water pipeline closest to the deaerator exhaust cooler outlet water pipeline, and the vacuum flash condenser reverse flow inlet electric valve is installed on the side of the three-stage elevation reverse flow inlet water pipeline closest to the vacuum flash condenser outlet water pipeline.

8. The energy-saving gasifier circulating water supply system according to any one of claims 1 to 7, characterized in that, The normal operating mode of this system is as follows: (1) After receiving the start command, the system opens the electric valve at the inlet of the circulating water pump to ensure that the inlet pipeline is unobstructed; (2) After 3-7 minutes, start the circulating water pumps sequentially to establish circulating water pressure; (3) After 30-90 seconds, open the electric valve at the outlet of the circulating water pump to send the circulating water into the outlet pipeline of the circulating water pump; (4) After 1-3 minutes, open the inlet electric valve of the wastewater cooler, the inlet electric valve of the acid gas condenser, and the inlet electric valve of the booster pump in sequence. (5) After 1-5 minutes, open the electric valve at the outlet of the wastewater cooler and the electric valve at the outlet of the acid gas condenser. (6) After 3-7 minutes, start the booster pump to increase the water supply pressure to meet the requirements of the three-stage high-level heat exchanger; (7) After 30-90 seconds, open the electric valve at the outlet of the booster pump; (8) After 1-3 minutes, open the electric valve at the inlet of the deaerator exhaust condenser and the electric valve at the inlet of the vacuum flash condenser. (9) After 1-5 minutes, open the electric valve at the outlet of the deaerator exhaust condenser and the electric valve at the outlet of the vacuum flash condenser. (10) At this point, the system enters a stable forward flow operation state. The circulating water passes through the wastewater cooler, acid gas condenser, deaerator exhaust condenser and vacuum flash condenser in sequence. After completing the cooling task, it returns to the cooling tower for cooling and enters the next cycle.

9. The energy-saving gasifier circulating water supply system according to claim 8, characterized in that, The backwashing process of the wastewater cooler is as follows: (1) When the temperature difference between the inlet and outlet of the wastewater cooler is less than or equal to 5°C, the reverse process is triggered; (2) Open the inlet electric valve and outlet electric valve of the wastewater cooler in sequence; (3) After confirming that the electric valve at the inlet of the wastewater cooler and the electric valve at the outlet of the wastewater cooler are fully open, close the electric valve at the inlet of the wastewater cooler and the electric valve at the outlet of the wastewater cooler in sequence. (4) Start the mobile ultrasonic cleaner in sequence, work at a speed of 0.5 meters per minute, and complete 5 cycles; (5) After the switching is completed, the water flow direction changes to "low inlet and high outlet" to perform reverse flushing of the inside of the wastewater cooler; The backwashing process of the acid gas condenser, deaerator exhaust condenser, and vacuum flash condenser is the same as that of the wastewater cooler backwashing process.

10. The energy-saving gasifier circulating water supply system according to claim 8, characterized in that, The process of restoring the wastewater cooler to normal operating mode is as follows: (1) Open the electric valve at the inlet of the wastewater cooler and the electric valve at the outlet of the wastewater cooler; (2) After confirming that the electric valve at the inlet of the wastewater cooler and the electric valve at the outlet of the wastewater cooler are fully open, close the electric valve at the inlet of the wastewater cooler and the electric valve at the outlet of the wastewater cooler in sequence. (3) Turn off the mobile ultrasonic cleaner in sequence and return the ultrasonic cleaner to its initial position; (4) At this point, the wastewater cooler has returned to its normal operating state of "high inlet, low outlet"; The process of restoring the acid gas condenser, deaerator exhaust condenser, and vacuum flash condenser to normal working mode is the same as that of restoring the wastewater cooler to normal working mode.

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