Gasification waste heat recycling system

Abstract

The utility model discloses a gasification waste heat recycling system, belongs to waste heat recycling equipment, and aims to solve the technical problems of production fluctuation, production reduction or production halt caused by non-uniform heat distribution. According to the technical scheme, the system comprises a high-pressure flash evaporation pipeline, a low-pressure flash evaporation pipeline, a boiler water cooler, a hot water heater, an intermediate water pump and a heat pump steam unit, gasification boiler water of the high-pressure flash evaporation pipeline and gasification boiler water of the low-pressure flash evaporation pipeline are mixed, then fed into the boiler water cooler, cooled by intermediate water of the boiler water cooler and then fed into the hot water heater. Returning to the settling tank from the outlet of the boiler water cooler through a settling pipeline; wherein the middle of the outlet end of the boiler water cooler is divided into two paths, one path enters the hot water heater, heating water from a heating station is heated by the hot water heater, then enters the middle water pump from the outlet end of the hot water heater, enters the boiler water cooler after being pressurized by the middle water pump, and circularly runs; and the other path enters the heat pump steam unit.

Description

Technical Field

[0001] The utility model relates to waste heat recovery equipment, in particular to a gasification waste heat recovery and utilization system. Background Art

[0002] Gasification waste heat recovery technology has been widely used in industries such as coal chemical industry and steel smelting. With the improvement of environmental protection requirements and the rise of energy prices, the market demand for gasification waste heat recovery technology is growing.

[0003] Although gasification waste heat recovery technology has great potential, it still faces some challenges during its promotion, such as high initial investment costs, insufficient technological maturity, and seasonal process matching. In particular, the full recovery and systematic application of heat from media such as gasifier water and flash steam still face problems such as low efficiency, incompleteness, uneconomicalness, low benefits, and imbalance.

[0004] During the heating season, waste heat from gasification is often used to provide heating, resulting in insufficient or lack of heat for cooling, seriously affecting the chilled water capacity required by the production system, causing production fluctuations, production reductions or even shutdowns. Summary of the Invention

[0005] The technical task of the utility model is to provide a gasification waste heat recovery and utilization system to solve the problems of production fluctuation, production reduction or production stoppage caused by uneven heat distribution.

[0006] The technical task of the utility model is achieved in the following manner: a gasification waste heat recovery and utilization system, which includes a high-pressure flash evaporation pipeline, a low-pressure flash evaporation pipeline, a boiler water cooler, a hot water heater, an intermediate water pump and a heat pump steam unit. The gasification boiler water in the high-pressure flash evaporation pipeline and the gasification boiler water in the low-pressure flash evaporation pipeline are mixed and sent to the boiler water cooler. After being cooled by the intermediate water in the boiler water cooler, the water is returned to the sedimentation tank from the outlet of the boiler water cooler through the sedimentation pipeline.

[0007] Among them, the intermediate water at the outlet of the boiler water cooler is divided into two routes. One route enters the hot water heater. After the hot water heater heats the heating water from the heating station, it enters the intermediate water pump from the outlet of the hot water heater. After the intermediate water pump increases the pressure, it enters the boiler water cooler and circulates. The other route enters the heat pump steam unit. After the outlet of the heat pump steam unit passes through the refrigeration component, it enters the intermediate water pump. After the intermediate water pump increases the pressure, it enters the boiler water cooler and circulates.

[0008] A heating water outlet pipe and a heating water inlet pipe are provided at the lower end of the hot water heater.

[0009] Preferably, the refrigeration assembly includes a primary refrigeration unit, a secondary refrigeration unit and a circulating water cooler. The outlet end of the heat pump steam unit enters the primary refrigeration unit through the intermediate water outlet valve of the heat pump steam unit and the intermediate water inlet valve of the primary refrigeration unit. The outlet end of the primary refrigeration unit enters the secondary refrigeration unit through the intermediate water outlet valve of the primary refrigeration unit and the intermediate water inlet valve of the secondary refrigeration unit. The outlet end of the secondary refrigeration unit enters the circulating water cooler through the intermediate water outlet valve of the secondary refrigeration unit. The outlet end of the circulating water cooler enters the intermediate water pump. After the intermediate water pump increases the pressure, the water enters the boiler water cooler through the intermediate water pump outlet flow regulating valve and the intermediate water inlet valve of the boiler water cooler, and circulates.

[0010] Among them, a spare water pump is provided on the pipeline connecting the boiler water cooler and the hot water heater, and the spare water pump is arranged in parallel with the intermediate water pump.

[0011] Preferably, the high-pressure flash evaporation pipeline is provided with a high-pressure flash evaporation boiler water outlet valve, the low-pressure flash evaporation pipeline is provided with a low-pressure flash tank boiler water outlet valve, and the sedimentation pipeline is provided with a boiler water cooler boiler water outlet valve 1 and a boiler water cooler boiler water outlet valve 2;

[0012] A boiler water cooler boiler water drain valve is provided at the lower end of the boiler water cooler.

[0013] Preferably, the gasifier water in the high-pressure flash evaporation pipeline and the gasifier water in the low-pressure flash evaporation pipeline are mixed and divided into two paths, one path enters the boiler water cooler through the boiler water inlet pipe and the boiler water inlet valve 1 of the boiler water cooler installed on the boiler water inlet pipe, and the other path enters the boiler water cooler through the boiler water inlet valve 2 of the boiler water cooler. A reverse cut pipeline is provided between the boiler water inlet pipe and the sedimentation pipeline, and a boiler water outlet valve 3 of the boiler water cooler is provided on the reverse cut pipeline.

[0014] More preferably, a first-stage refrigeration unit intermediate water inlet valve 2 is provided on the pipeline connecting the first-stage refrigeration unit and the second-stage refrigeration unit, so as to maintain normal operation of the first-stage refrigeration unit and the second-stage refrigeration unit when the heat pump steam unit fails.

[0015] More preferably, a primary refrigeration unit intermediate water connecting valve is provided on the pipeline connecting the heat pump steam unit and the secondary refrigeration unit, so that when the primary refrigeration unit fails, the heat pump steam unit and the secondary refrigeration unit can be kept in normal operation.

[0016] More preferably, a secondary refrigeration unit intermediate water connecting valve is provided on the pipeline connecting the heat pump steam unit with the primary refrigeration unit and the circulating water cooler. When the secondary refrigeration unit fails, the heat pump steam unit, the primary refrigeration unit and the circulating water cooler are maintained in normal operation.

[0017] More preferably, the lower end of the heat pump steam unit is provided with a circulating water outlet pipe 1, a circulating water inlet pipe 1, a boiler water inlet pipe and a steam outlet pipe in sequence, the boiler water inlet pipe is provided with a heat pump steam unit boiler water inlet valve, and the steam outlet pipe is provided with a heat pump steam unit steam outlet valve;

[0018] Among them, an intermediate water inlet valve of the heat pump steam unit is provided on the pipeline connecting the heat pump steam unit and the boiler water cooler.

[0019] More preferably, a double-effect steam inlet pipe 1 and a steam condensate outlet pipe 1 are respectively provided on both sides of the first-stage refrigeration unit, and a double-effect steam inlet valve of the first-stage refrigeration unit is provided on the double-effect steam inlet pipe 1;

[0020] The lower end of the first-stage refrigeration unit is sequentially provided with a circulating water outlet pipe 2, a circulating water inlet pipe 2, a low-temperature cold water inlet pipe 1 and a low-temperature cold water outlet pipe 1.

[0021] More preferably, a double-effect steam inlet pipe 2 and a steam condensate outlet pipe 2 are respectively provided on both sides of the secondary refrigeration unit, and a double-effect steam inlet valve of the secondary refrigeration unit is provided on the double-effect steam inlet pipe 2;

[0022] The lower end of the secondary refrigeration unit is provided with a circulating water outlet pipe 3, a circulating water inlet pipe 3, a low-temperature cold water inlet pipe 2 and a low-temperature cold water outlet pipe 2 in sequence;

[0023] The lower end of the circulating water cooler is provided with a circulating water outlet pipe four and a circulating water inlet pipe four, and the circulating water inlet pipe four is provided with a circulating water cooler temperature regulating valve.

[0024] The utility model provides a gasification waste heat recovery and utilization system with the following advantages:

[0025] (1) The utility model designs a dual-energy, dual-effect refrigeration unit process, adopts steam heat source to supplement or replace the heat source for cooling, ensuring that the cold water cooling capacity required by the production system can still be met during the heating season, solving the problems of production fluctuations, production reductions or shutdowns caused by uneven heat distribution, and improving energy utilization;

[0026] (2) The utility model recovers heat energy accounting for about 2.5% of the mass of the coal fed into the gasifier. Through primary and secondary heat exchange, about 1% of the heat is used to produce low-pressure steam, which is returned to the production heat pipe network; about 1.5% of the heat is used to produce low-temperature cold water required for the production process, thereby improving the process conditions of the cooling and heat exchange equipment;

[0027] (3) The utility model can simultaneously meet the needs of user heating and production system cold water cooling during the heating season. That is, during the heating season, the vaporization waste heat is used to provide user heating heat, and the heat source of the refrigeration unit is switched from the vaporization waste heat to the dual-energy steam mode, continuing to stably maintain the production of cold water cooling capacity of the production system;

[0028] (4) The utility model is designed to combine multiple operating modes. The core equipment in the system can be connected in series or in parallel, such as a heat pump steam unit + a primary refrigeration unit + a secondary refrigeration unit, or a heat pump steam unit + a primary refrigeration unit + a circulating water cooler, or a primary refrigeration unit + a secondary refrigeration unit + a circulating water cooler. Different operating plans are provided according to the amount of waste heat recovery to meet the needs of the production system;

[0029] (5) The present invention is provided with a circulating water cooler as a safety device to ensure that the outlet temperature of the gasifier water cooler meets the standard; under normal conditions, the circulating water cooler is not put into use, and is put into use when one or more of the heat pump steam unit / primary refrigeration unit / secondary refrigeration unit fails to ensure the stability of the water temperature index of the production system;

[0030] (6) The utility model is provided with an intermediate water pump and a backup water pump, one in operation and one in reserve. When the operating water pump fails, the other water pump automatically starts according to the flow rate change to ensure the circulation supply of the intermediate water;

[0031] In summary, the utility model can fully recycle and utilize the gasification waste heat in both the heating season and the non-heating season, thereby maximizing the economic benefits.

[0032] Therefore, the utility model has the characteristics of reasonable design, simple structure, easy processing, small size, convenient use, and multiple uses, and thus has good promotion and use value. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention will be further described below with reference to the accompanying drawings.

[0034] Attachment Figure 1 This is a schematic diagram of a gasification waste heat recovery and utilization system.

[0035] Figure 1: Boiler water cooler, 2: Heat pump steam unit, 3: Primary refrigeration unit, 4: Secondary refrigeration unit, 5: Circulating water cooler, 6: Hot water heater, 7: Intermediate water pump (organic heat carrier), 8: Boiler water outlet valve for high-pressure flash tank, 9: Boiler water outlet valve for low-pressure flash tank, 10: Boiler water outlet valve for boiler water cooler, 11: Boiler water inlet valve 1 for boiler water cooler, 12: Boiler water outlet valve 1 for boiler water cooler, 13: Boiler water inlet valve 2 for boiler water cooler, 14: Boiler water outlet valve 2 for boiler water cooler, 15: Boiler water drain valve for boiler water cooler , 16, boiler water cooler intermediate water outlet valve, 17, boiler water cooler intermediate water inlet valve, 18, intermediate water pump outlet flow regulating valve, 19, heat pump steam unit intermediate water inlet valve, 20, heat pump steam unit intermediate water outlet valve, 21, first-stage refrigeration unit intermediate water inlet valve one, 22, first-stage refrigeration unit intermediate water outlet valve, 23, first-stage refrigeration unit intermediate water inlet valve two, 24, first-stage refrigeration unit intermediate water connecting valve, 25, second-stage refrigeration unit intermediate water inlet valve one, 26, second-stage refrigeration unit intermediate water outlet valve, 27, second-stage system 2. Intermediate water connecting valve of refrigeration unit, 28. Circulating water cooler temperature regulating valve, 29. Boiler water inlet valve of heat pump steam unit, 30. Steam outlet valve of heat pump steam unit, 31. Double-effect steam inlet valve of first-stage refrigeration unit, 32. Double-effect steam inlet valve of second-stage refrigeration unit, 33. High-pressure flash evaporation pipeline, 34. Low-pressure flash evaporation pipeline, 35. Heating outlet pipe, 36. Heating inlet pipe, 37. Sedimentation pipeline, 38. Circulating water outlet pipe 1, 39. Circulating water inlet pipe 1, 40. Boiler water inlet pipe, 41. Steam outlet pipe, 42. Double-effect steam evaporation pipeline, Steam inlet pipe one, 43. Steam condensate outlet pipe one, 44. Circulating water outlet pipe two, 45. Circulating water inlet pipe two, 46. Low-temperature cold water inlet pipe one, 47. Low-temperature cold water outlet pipe one, 48. Double-effect steam inlet pipe two, 49. Steam condensate outlet pipe two, 50. Circulating water outlet pipe three, 51. Circulating water inlet pipe three, 52. Low-temperature cold water inlet pipe two, 53. Low-temperature cold water outlet pipe two, 54. Circulating water outlet pipe four, 55. Circulating water inlet pipe four, 56. Standby water pump, 57. Boiler water inlet pipe, 58. Reverse cut pipeline. DETAILED DESCRIPTION

[0036] A gasification waste heat recovery and utilization system of the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] In the description of this utility model, it should be understood that terms such as "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" are used to indicate positions or locations based on the positions or locations shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific manner, and therefore should not be construed as limitations of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0039] Example:

[0040] As attached Figure 1 As shown, this embodiment provides a gasification waste heat recovery and utilization system, which includes a high-pressure flash evaporation pipeline, a low-pressure flash evaporation pipeline, a boiler water cooler, a hot water heater, an intermediate water pump, and a heat pump steam unit. The gasifier water in the high-pressure flash evaporation pipeline 33 and the gasifier water in the low-pressure flash evaporation pipeline 34 are mixed and sent to the boiler water cooler 1. After being cooled by the intermediate water in the boiler water cooler 1, the water is returned to the settling tank from the outlet of the boiler water cooler 1 through the settling pipeline 37.

[0041] Among them, the intermediate water at the outlet end of the boiler water cooler 1 is divided into two paths. One path enters the hot water heater 2. After the hot water heater 2 heats the heating water from the heating station, it enters the intermediate water pump 7 from the outlet end of the hot water heater 2. After being pressurized by the intermediate water pump 7, it enters the boiler water cooler 1 and circulates; the other path enters the heat pump steam unit 2. After passing through the refrigeration component at the outlet end of the heat pump steam unit 2, it enters the intermediate water pump 7. After being pressurized by the intermediate water pump 7, it enters the boiler water cooler 1 and circulates; the lower end of the hot water heater 2 is provided with a heating water outlet pipe 25 and a heating water inlet pipe 36.

[0042] One end of the high-pressure flash evaporation pipeline 33 in this embodiment is connected to the high-pressure flash evaporation tank, and a high-pressure flash evaporation boiler water outlet valve 8 is installed on the high-pressure flash evaporation pipeline 33; one end of the low-pressure flash evaporation pipeline 34 is connected to the low-pressure flash evaporation tank, and a low-pressure flash evaporation tank boiler water outlet valve 9 is installed on the low-pressure flash evaporation pipeline 34; the boiler water cooler boiler water outlet valve 10 and the boiler water cooler boiler water outlet valve 12 are installed on the sedimentation pipeline 37; the boiler water cooler boiler water drain valve 15 is installed at the lower end of the boiler water cooler 1.

[0043] The refrigeration assembly in this embodiment includes a primary refrigeration unit 3, a secondary refrigeration unit 4 and a circulating water cooler 5. The outlet end of the heat pump steam unit 2 enters the primary refrigeration unit 3 through the intermediate water outlet valve 20 of the heat pump steam unit and the intermediate water inlet valve 21 of the primary refrigeration unit. The outlet end of the primary refrigeration unit 3 enters the secondary refrigeration unit 4 through the intermediate water outlet valve 22 of the primary refrigeration unit and the intermediate water inlet valve 25 of the secondary refrigeration unit. The outlet end of the secondary refrigeration unit 4 enters the circulating water cooler 5 through the intermediate water outlet valve 26 of the secondary refrigeration unit. The outlet end of the circulating water cooler 5 enters the intermediate water pump 7. After the intermediate water pump 7 increases the pressure, the water enters the boiler water cooler 1 through the intermediate water pump outlet flow regulating valve 18 and the boiler water cooler intermediate water inlet valve 17, and the circulation operation is carried out.

[0044] A standby water pump 56 is installed on the pipeline connecting the boiler water cooler 1 and the hot water heater 6 , and the standby water pump 56 is arranged in parallel with the intermediate water pump 7 .

[0045] In this embodiment, the gasification boiler water in the high-pressure flash evaporation pipeline 33 and the gasification boiler water in the low-pressure flash evaporation pipeline 34 are mixed and divided into two paths. One path enters the boiler water cooler 1 through the boiler water inlet pipe 57 and the boiler water cooler boiler water inlet valve 11 installed on the boiler water inlet pipe 57, and the other path enters the boiler water cooler 1 through the boiler water cooler boiler water inlet valve 2 13. A reverse cut pipeline 58 is installed between the boiler water inlet pipe 57 and the sedimentation pipeline 37, and the boiler water cooler boiler water outlet valve 3 14 is installed on the reverse cut pipeline 58.

[0046] In this embodiment, a first-stage refrigeration unit intermediate water inlet valve 23 is installed on the pipeline connecting the first-stage refrigeration unit 3 and the second-stage refrigeration unit 4. When the heat pump steam unit 2 fails, the first-stage refrigeration unit 3 and the second-stage refrigeration unit 4 are maintained in normal operation.

[0047] In this embodiment, a primary refrigeration unit intermediate water connecting valve 24 is installed on the pipeline connecting the heat pump steam unit 2 and the secondary refrigeration unit 4. When the primary refrigeration unit 3 fails, the heat pump steam unit 2 and the secondary refrigeration unit 4 are maintained in normal operation.

[0048] In this embodiment, a secondary refrigeration unit intermediate water connecting valve 27 is installed on the pipeline connecting the heat pump steam unit 2 with the primary refrigeration unit 3 and the circulating water cooler 5. When the secondary refrigeration unit 4 fails, the normal operation of the heat pump steam unit 2, the primary refrigeration unit 3 and the circulating water cooler 5 is maintained.

[0049] In this embodiment, the lower end of the heat pump steam unit 2 is sequentially installed with a circulating water outlet pipe 38, a circulating water inlet pipe 39, a boiler water inlet pipe 40 and a steam outlet pipe 41. The boiler water inlet pipe 40 is installed with the heat pump steam unit boiler water inlet valve 29, and the steam outlet pipe 41 is installed with the heat pump steam unit steam outlet valve 30;

[0050] Among them, the heat pump steam unit intermediate water inlet valve 19 is installed on the pipeline connecting the heat pump steam unit 2 and the boiler water cooler 1.

[0051] In this embodiment, a double-effect steam inlet pipe 42 and a steam condensate outlet pipe 43 are installed on both sides of the first-stage refrigeration unit 3, and a double-effect steam inlet valve 31 of the first-stage refrigeration unit is installed on the double-effect steam inlet pipe 42;

[0052] The lower end of the first-stage refrigeration unit 3 is sequentially provided with a circulating water outlet pipe 2 44 , a circulating water inlet pipe 2 45 , a low-temperature cold water inlet pipe 1 46 and a low-temperature cold water outlet pipe 1 47 .

[0053] In this embodiment, a second double-effect steam inlet pipe 48 and a second steam condensate outlet pipe 49 are installed on both sides of the secondary refrigeration unit 4, and a second double-effect steam inlet valve 32 of the secondary refrigeration unit is installed on the second double-effect steam inlet pipe 48;

[0054] The lower end of the secondary refrigeration unit 4 is sequentially provided with a circulating water outlet pipe 3 50 , a circulating water inlet pipe 3 51 , a low-temperature cold water inlet pipe 2 52 and a low-temperature cold water outlet pipe 2 53 .

[0055] In this embodiment, the lower end of the circulating water cooler 5 is equipped with a circulating water outlet pipe 4 54 and a circulating water inlet pipe 4 55. A circulating water cooler temperature control valve 28 is installed on the circulating water inlet pipe 4 55. The circulating water cooler 5 serves as a safety device, ensuring the normal temperature of the intermediate water in the event of a failure of the heat pump steam unit 2, the primary refrigeration unit 3, or the secondary refrigeration unit 4. The circulating water cooler 5 is equipped with a circulating water cooler temperature control valve 28, which adjusts the circulating water flow rate based on the outlet temperature of the circulating water cooler 5.

[0056] The processes of the heat pump steam unit 2, the first-stage refrigeration unit 3, and the second-stage refrigeration unit 4 can be connected in series or in parallel. In normal operation, they can be connected in series. When one of them fails, the valve switch can be interlocked and adjusted to cut off the faulty equipment to ensure normal operation.

[0057] In this embodiment, the circulation paths are as follows:

[0058] ① The specific black water circulation process is: high-pressure flash tank boiler water outlet valve 8 + low-pressure flash tank boiler water outlet valve 9 → boiler water cooler boiler water inlet valve 11 → boiler water cooler 1 → boiler water cooler boiler water outlet valve 12 → boiler water cooler boiler water outlet valve 10.

[0059] ② The specific black water back-cutting process is: high-pressure flash tank boiler water outlet valve 8 + low-pressure flash tank boiler water outlet valve 9 → boiler water cooler boiler water inlet valve 2 13 → boiler water cooler 1 → boiler water cooler boiler water outlet valve 2 14 → boiler water cooler boiler water outlet valve 10.

[0060] ③ The intermediate water process (heating season operating conditions) is specifically as follows: intermediate water pump 7 → intermediate water pump outlet flow regulating valve 18 → boiler water cooler intermediate water inlet valve 17 → boiler water cooler 1 → boiler water cooler intermediate water outlet valve 16 → hot water heater 6 → intermediate water pump 7.

[0061] ④ The intermediate water process (non-heating season operating conditions) is specifically as follows: intermediate water pump 7 → intermediate water pump outlet flow regulating valve 18 → boiler water cooler intermediate water inlet valve 17 → boiler water cooler 1 → boiler water cooler intermediate water outlet valve 16 → heat pump steam unit intermediate water inlet valve 19 → heat pump steam unit 2 → heat pump steam unit intermediate water outlet valve 20 → first-stage refrigeration unit intermediate water inlet valve 21 → first-stage refrigeration unit 3 → first-stage refrigeration unit intermediate water outlet valve 22 → second-stage refrigeration unit intermediate water inlet valve 25 → second-stage refrigeration unit 4 → second-stage refrigeration unit intermediate water outlet valve 26 → circulating water cooler 5 → intermediate water pump 7.

[0062] ⑤ The intermediate water flow (non-heating season operating conditions, when the heat pump steam unit 2 fails) is specifically as follows: intermediate water pump 7 → intermediate water pump outlet flow regulating valve 18 → boiler water cooler intermediate water inlet valve 17 → boiler water cooler 1 → boiler water cooler intermediate water outlet valve 16 → first-stage refrigeration unit intermediate water inlet valve 2 23 → first-stage refrigeration unit intermediate water inlet valve 1 21 → first-stage refrigeration unit 3 → first-stage refrigeration unit intermediate water outlet valve 22 → second-stage refrigeration unit intermediate water inlet valve 1 25 → second-stage refrigeration unit 4 → second-stage refrigeration unit intermediate water outlet valve 26 → circulating water cooler 5 → intermediate water pump 7.

[0063] ⑥ The intermediate water flow (non-heating season operating conditions, when the first-stage refrigeration unit 3 fails) is specifically as follows: intermediate water pump 7 → intermediate water pump outlet flow regulating valve 18 → boiler water cooler intermediate water inlet valve 17 → boiler water cooler 1 → boiler water cooler intermediate water outlet valve 16 → heat pump steam unit intermediate water inlet valve 19 → heat pump steam unit 2 → heat pump steam unit intermediate water outlet valve 20 → first-stage refrigeration unit intermediate water connecting valve 24 → second-stage refrigeration unit intermediate water inlet valve 25 → second-stage refrigeration unit 4 → second-stage refrigeration unit intermediate water outlet valve 26 → circulating water cooler 5 → intermediate water pump 7.

[0064] ⑦ The intermediate water flow (non-heating season operating conditions, when the secondary refrigeration unit 4 fails) is specifically as follows: intermediate water pump 7 → intermediate water pump outlet flow regulating valve 18 → boiler water cooler intermediate water inlet valve 17 → boiler water cooler 1 → boiler water cooler intermediate water outlet valve 16 → heat pump steam unit intermediate water inlet valve 19 → heat pump steam unit 2 → heat pump steam unit intermediate water outlet valve 20 → first-stage refrigeration unit intermediate water inlet valve 21 → first-stage refrigeration unit 3 → first-stage refrigeration unit intermediate water outlet valve 22 → second-stage refrigeration unit intermediate water connecting valve 27 → circulating water cooler 5 → intermediate water pump 7.

[0065] Intermediate water flow (non-heating season operating conditions), intermediate water flow (non-heating season operating conditions, when the heat pump steam unit 2 fails), intermediate water flow (non-heating season operating conditions, when the first-stage refrigeration unit 3 fails), intermediate water flow (non-heating season operating conditions, when the second-stage refrigeration unit 4 fails) - four operating conditions in the non-heating season, equipment is connected in parallel.

[0066] This embodiment can fully recycle and utilize the gasification waste heat in both the heating season and the non-heating season, thereby maximizing the economic benefits.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A gasification waste heat recovery and utilization system, characterized in that: The system includes a high-pressure flash evaporation pipeline, a low-pressure flash evaporation pipeline, a boiler water cooler, a hot water heater, an intermediate water pump, and a heat pump steam unit. The gasification furnace water in the high-pressure flash evaporation pipeline and the gasification furnace water in the low-pressure flash evaporation pipeline are mixed and sent to the boiler water cooler. After being cooled by the intermediate water in the boiler water cooler, the water is returned to the sedimentation tank from the outlet of the boiler water cooler through the sedimentation pipeline. Among them, the intermediate water at the outlet of the boiler water cooler is divided into two routes. One route enters the hot water heater. After the hot water heater heats the heating water from the heating station, it enters the intermediate water pump from the outlet of the hot water heater. After the intermediate water pump increases the pressure, it enters the boiler water cooler and circulates. The other route enters the heat pump steam unit. After the outlet of the heat pump steam unit passes through the refrigeration component, it enters the intermediate water pump. After the intermediate water pump increases the pressure, it enters the boiler water cooler and circulates. A heating water outlet pipe and a heating water inlet pipe are provided at the lower end of the hot water heater.

2. The gasification waste heat recovery and utilization system according to claim 1, characterized in that: The refrigeration assembly includes a primary refrigeration unit, a secondary refrigeration unit and a circulating water cooler. The outlet end of the heat pump steam unit enters the primary refrigeration unit through the intermediate water outlet valve of the heat pump steam unit and the intermediate water inlet valve of the primary refrigeration unit. The outlet end of the primary refrigeration unit enters the secondary refrigeration unit through the intermediate water outlet valve of the primary refrigeration unit and the intermediate water inlet valve of the secondary refrigeration unit. The outlet end of the secondary refrigeration unit enters the circulating water cooler through the intermediate water outlet valve of the secondary refrigeration unit. The outlet end of the circulating water cooler enters the intermediate water pump. After the intermediate water pump increases the pressure, the water enters the boiler water cooler through the intermediate water pump outlet flow regulating valve and the intermediate water inlet valve of the boiler water cooler, and the water is circulated. Among them, a spare water pump is provided on the pipeline connecting the boiler water cooler and the hot water heater, and the spare water pump is arranged in parallel with the intermediate water pump.

3. The gasification waste heat recovery and utilization system according to claim 1, characterized in that: The high-pressure flash evaporation pipeline is provided with a high-pressure flash evaporation boiler water outlet valve, the low-pressure flash evaporation pipeline is provided with a low-pressure flash tank boiler water outlet valve, and the sedimentation pipeline is provided with a boiler water cooler boiler water outlet valve 1 and a boiler water cooler boiler water outlet valve 2; A boiler water cooler boiler water drain valve is provided at the lower end of the boiler water cooler.

4. The gasification waste heat recovery and utilization system according to claim 1, characterized in that: The gasification furnace water in the high-pressure flash evaporation pipeline and the gasification furnace water in the low-pressure flash evaporation pipeline are mixed and divided into two paths. One path enters the boiler water cooler through the boiler water inlet pipe and the boiler water inlet valve 1 of the boiler water cooler installed on the boiler water inlet pipe, and the other path enters the boiler water cooler through the boiler water inlet valve 2 of the boiler water cooler. A reverse cut pipeline is provided between the boiler water inlet pipe and the sedimentation pipeline, and the boiler water outlet valve 3 of the boiler water cooler is provided on the reverse cut pipeline.

5. The gasification waste heat recovery and utilization system according to claim 2, characterized in that: A first-stage refrigeration unit intermediate water inlet valve 2 is provided on the pipeline connecting the first-stage refrigeration unit and the second-stage refrigeration unit. When the heat pump steam unit fails, the first-stage refrigeration unit and the second-stage refrigeration unit are maintained in normal operation.

6. The gasification waste heat recovery and utilization system according to claim 2, characterized in that: A primary refrigeration unit intermediate water connecting valve is provided on the pipeline connecting the heat pump steam unit and the secondary refrigeration unit. When the primary refrigeration unit fails, the heat pump steam unit and the secondary refrigeration unit are maintained in normal operation.

7. The gasification waste heat recovery and utilization system according to claim 2, characterized in that: A secondary refrigeration unit intermediate water connecting valve is provided on the pipeline connecting the heat pump steam unit with the primary refrigeration unit and the circulating water cooler. When the secondary refrigeration unit fails, the heat pump steam unit, the primary refrigeration unit and the circulating water cooler are maintained in normal operation.

8. The gasification waste heat recovery and utilization system according to claim 2, characterized in that: The lower end of the heat pump steam unit is provided with a circulating water outlet pipe 1, a circulating water inlet pipe 1, a boiler water inlet pipe and a steam outlet pipe in sequence, the boiler water inlet pipe is provided with a heat pump steam unit boiler water inlet valve, and the steam outlet pipe is provided with a heat pump steam unit steam outlet valve; Among them, an intermediate water inlet valve of the heat pump steam unit is provided on the pipeline connecting the heat pump steam unit and the boiler water cooler.

9. The gasification waste heat recovery and utilization system according to claim 2, characterized in that: A double-effect steam inlet pipe 1 and a steam condensate outlet pipe 1 are respectively provided on both sides of the first-stage refrigeration unit, and a double-effect steam inlet valve of the first-stage refrigeration unit is provided on the double-effect steam inlet pipe 1; The lower end of the first-stage refrigeration unit is sequentially provided with a circulating water outlet pipe 2, a circulating water inlet pipe 2, a low-temperature cold water inlet pipe 1 and a low-temperature cold water outlet pipe 1.

10. The gasification waste heat recovery and utilization system according to claim 2, characterized in that: A double-effect steam inlet pipe 2 and a steam condensate outlet pipe 2 are respectively provided on both sides of the secondary refrigeration unit, and a double-effect steam inlet valve of the secondary refrigeration unit is provided on the double-effect steam inlet pipe 2; The lower end of the secondary refrigeration unit is provided with a circulating water outlet pipe 3, a circulating water inlet pipe 3, a low-temperature cold water inlet pipe 2 and a low-temperature cold water outlet pipe 2 in sequence; The lower end of the circulating water cooler is provided with a circulating water outlet pipe four and a circulating water inlet pipe four, and the circulating water inlet pipe four is provided with a circulating water cooler temperature regulating valve.

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