A dynamically adjustable heat recovery device

Abstract

The utility model discloses a dynamic adjustable conversion heat recovery device, include: low pressure waste boiler, boiler feed water heater, medium pressure desalted water heater, low pressure desalted water heater, conversion gas water cooler, medium pressure waste boiler, first water separator, second water separator, ammonia washing tower, its characterized in that still includes a medium pressure waste boiler, the medium pressure waste boiler is connected in series with low pressure waste boiler and is parallelly connected operation, the boiler feed water heater is connected with the medium pressure waste boiler, low pressure waste boiler and is parallelly connected operation, low pressure desalted water heater and medium pressure desalted water heater are parallelly connected operation. Adopt the dynamic adjustable conversion heat recovery device of the utility model, and the device is little, and the energy -conserving yield -increasing effect is obvious, has very good environmental and economic benefits.

Description

Technical Field

[0001] This utility model relates to the field of shift heat recovery, and particularly to carbon monoxide shift heat recovery and the retrofitting of heat recovery in existing shift devices. In particular, it relates to a dynamically adjustable shift heat recovery device, which solves the problem that the heat recovery of carbon monoxide shift devices cannot meet the steam and heat balance requirements of the entire plant. Background Technology

[0002] Heat recovery in the shift converter is a key aspect of energy saving and efficiency improvement in this process. The shift reaction (CO + H2O ⇌ CO2 + H2 + heat) is a moderately strong exothermic reaction. Effectively recovering and utilizing this reaction heat is crucial for improving the energy efficiency of the entire plant (such as ammonia synthesis, hydrogen production, methanol, ethylene glycol, coal-to-natural gas, etc.), reducing operating costs, and minimizing carbon emissions.

[0003] The selection of a heat recovery scheme needs to consider factors such as the overall steam balance, heat balance, process gas temperature distribution, investment costs, and operational flexibility of the plant, choosing the most economical and reasonable combination. The essence of heat recovery in a water-gas conversion unit is "temperature matching and cascaded utilization," optimizing the heat exchange network design, rationally matching the temperature levels of hot and cold streams, reducing irreversible heat transfer losses, and improving overall heat recovery efficiency.

[0004] Currently, conventional heat recovery systems typically consist of a low-pressure waste boiler (E1), an ammonia washing tower (T1), a boiler feedwater preheater (E2), a medium-pressure demineralized water preheater (E3), a low-pressure demineralized water preheater (E4), a water cooler (E5), a first water separator (V1), and a second water separator (V2), which sequentially recover heat to provide low-pressure steam and a low-temperature heat source for the entire plant. The process is as follows: Figure 1 As shown. However, conventional converters do not fully utilize the heat gradient, making it difficult to match the dynamic adjustment of the plant's steam and heat balance. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a dynamically adjustable shift heat recovery device that addresses the problem of insufficient utilization of the heat gradient in conventional shift conversion devices and the difficulty in dynamically adjusting the steam balance and heat balance of the entire plant.

[0006] The technical problem to be solved by this utility model can be achieved through the following technical solution: A dynamically adjustable shift heat recovery device includes: a low-pressure waste boiler, a boiler feedwater heater, a medium-pressure demineralized water heater, a low-pressure demineralized water heater, a shift gas water cooler, a medium-pressure waste boiler, a first water separator, a second water separator, and an ammonia washing tower. The device is characterized by further including a medium-pressure waste boiler, wherein the medium-pressure waste boiler and the low-pressure waste boiler are connected in series and parallel; the boiler feedwater heater is connected in parallel with the medium-pressure waste boiler and the low-pressure waste boiler; and the low-pressure demineralized water heater is connected in parallel with the medium-pressure demineralized water heater.

[0007] In a preferred embodiment of this utility model, the medium-pressure waste heat boiler has a first shift gas inlet, a first shift gas outlet, a first water supply inlet, and a low-pressure steam outlet. Water from the medium-pressure waste heat boiler enters the boiler through the first water supply inlet and exchanges heat with the shift gas entering the boiler through the first shift gas inlet. The heat-exchanged shift gas is then discharged through the first shift gas outlet, and the resulting medium-pressure steam is discharged through the medium-pressure steam outlet. The first shift gas inlet and the first shift gas outlet of the medium-pressure waste heat boiler are connected by a bypass pipeline, and a bypass valve is installed on the bypass pipeline. The low-pressure waste heat boiler has a second shift gas inlet, a second shift gas outlet, a second water inlet, and a low-pressure steam outlet. Water from the low-pressure waste heat boiler enters the boiler through the second water inlet and exchanges heat with the shift gas entering the boiler through the second shift gas inlet. The heat-exchanged shift gas is then discharged through the second shift gas outlet, and the low-pressure steam formed after the heat exchange is discharged through the low-pressure steam outlet. The second shift gas inlet is connected to the first shift gas outlet. The boiler feedwater heater has a third feedwater inlet, a third feedwater outlet, a third shift gas inlet, and a third shift gas outlet. Water fed through the third feedwater inlet exchanges heat with shift gas entering through the third shift gas inlet and is heated, then sent through the third feedwater outlet to the first feedwater inlet of the medium-pressure waste boiler and the second feedwater inlet of the low-pressure waste boiler. The third shift gas inlet is connected to the first shift gas inlet of the medium-pressure waste boiler, and the third shift gas outlet is connected to the second shift gas outlet of the low-pressure waste boiler. The first water separator has a fourth shift gas inlet, a fourth shift gas outlet and a first condensate outlet, wherein the fourth shift gas inlet is connected to the second shift gas outlet; The medium-pressure demineralized water heater has a fifth shift gas inlet, a fifth shift gas outlet, a medium-pressure demineralized water inlet, and a medium-pressure demineralized water outlet. The medium-pressure demineralized water entering through the medium-pressure demineralized water inlet exchanges heat with the shift gas entering through the fifth shift gas inlet and is then sent out through the medium-pressure demineralized water outlet. The shift gas after heat exchange is sent out through the fifth shift gas outlet. The fifth shift gas inlet is connected to the fourth shift gas outlet. The low-pressure demineralized water heater has a sixth change gas inlet, a sixth change gas outlet, a low-pressure demineralized water inlet, and a low-pressure demineralized water outlet. The low-pressure demineralized water entering through the low-pressure demineralized water inlet exchanges heat with the change gas entering through the sixth change gas inlet and is then sent out through the low-pressure demineralized water outlet. The change gas after heat exchange is sent out through the sixth change gas outlet. The sixth change gas inlet is connected to the fourth change gas outlet. The second water separator has a seventh shift gas inlet, a seventh shift gas outlet, and a second condensate outlet. The first condensate outlet and the second condensate outlet are connected to a condensate delivery pipeline. The seventh shift gas inlet is connected to the fifth shift gas outlet and the sixth shift gas outlet. The gas-changing water cooler has an eighth gas-changing inlet, an eighth gas-changing outlet, a cooling water inlet, and a cooling water outlet. The eighth gas-changing outlet is connected to the seventh gas-changing inlet. After the cooling water entering the gas-changing water cooler through the cooling water inlet exchanges heat with the gas entering the gas-changing water cooler through the eighth gas-changing inlet, the cooling water is sent out from the cooling water outlet, and the heat-exchanged gas is sent out from the eighth gas-changing outlet. The ammonia washing tower has a ninth shift gas outlet at the top, a cold boiler feedwater inlet at the top, a ninth shift gas inlet in the middle, and a third condensate outlet at the bottom. The ninth shift gas inlet is connected to the eighth shift gas outlet. The cold boiler water entering through the cold boiler feedwater inlet washes away the ammonia in the shift gas in the ammonia washing tower. The shift gas after ammonia removal is sent out for purification through the ninth shift gas outlet, and the condensate is sent to the condensate delivery pipeline through the third condensate outlet.

[0008] The working principle of this invention is as follows: The shift gas from the shift converter is divided into two streams. One stream enters the boiler feedwater heater to preheat the boiler feedwater, and the other stream enters the medium-pressure waste heat boiler to produce medium-pressure steam. A bypass is installed in the medium-pressure waste heat boiler, and the gas then enters the low-pressure waste heat boiler to produce low-pressure steam. The two streams are then combined. After the mixed shift gas enters the first water separator to separate the condensate, the outlet shift gas is divided into two streams. One stream enters the medium-pressure demineralized water heater to recover heat energy, and the other stream enters the low-pressure demineralized water heater to recover heat energy. The two process gas streams are then mixed. After the mixed shift gas enters the second water separator to separate the condensate, the outlet shift gas is cooled to 35°C by the shift gas water cooler before entering the ammonia washing tower.

[0009] The features and innovations of this utility model are as follows: 1. The process is reliable, and the heat recovery scheme can be dynamically adjusted according to the steam balance and heat balance requirements of the entire plant.

[0010] 2. Set up a medium- and low-pressure waste boiler to produce saturated steam of 1.0~2.5MPa level by-product. The waste boiler of 0.5MPa level is connected in series and parallel in the process to meet the dynamic needs of the plant for steam of different pressure levels.

[0011] 3. The boiler feedwater preheater and the 0.5MPa low-pressure waste boiler are designed in parallel in the process flow to increase the preheating temperature of the boiler feedwater, thereby producing more high-grade medium- and high-pressure steam as a byproduct. The preheating boiler feedwater flow rate and temperature are adjustable within a certain range according to the overall boiler feedwater operating load of the plant.

[0012] 4. The medium-pressure demineralized water preheater and the low-pressure demineralized water preheater are designed in parallel in terms of process flow. The flow rate and temperature of medium-pressure and low-pressure demineralized water can be flexibly adjusted according to the heat balance requirements of the entire plant. At the same time, since the inlet demineralized water is at room temperature, the gas temperature entering the downstream water cooler can be reduced to the minimum, saving circulating water consumption.

[0013] The series-parallel design of the 5.1.0~2.5MPa medium and low pressure waste boiler and the 0.5MPa low pressure waste boiler, the parallel design of the boiler feedwater preheater and the 0.5MPa low pressure waste boiler, and the parallel design of the medium pressure demineralized water preheater and the low pressure demineralized water preheater can reduce the pressure drop of the conversion section system, which is beneficial to the operation of downstream compressors and saves compression power consumption.

[0014] 6. For renovation projects, the reserved time for switching during shutdown can be utilized to carry out relevant technical upgrades without affecting the plant's shutdown plan, thereby reducing the number of start-ups and shutdowns and significantly improving the energy efficiency and economic benefits of the entire plant.

[0015] The dynamically adjustable heat recovery device of this invention requires minimal modification to the device, exhibits significant energy-saving and production-increasing effects, and provides excellent environmental and economic benefits. The specific effects achievable by this invention are as follows: 1. The dynamic adjustable heat recovery device of this utility model makes reasonable use of energy in the conversion section and fully recovers heat.

[0016] 2. The dynamically adjustable heat recovery device of this utility model has a dynamically adjustable heat recovery scheme, which can meet the requirements of various steam balance and heat balance of the whole plant.

[0017] 3. The dynamic adjustable changeover heat recovery device of this utility model can produce steam of different grades as by-products, which can meet the dynamic needs of the factory for steam of different pressure levels. The adjustment method is simple and efficient.

[0018] 4. By adopting the dynamic adjustable heat recovery device of this utility model, the preheating temperature of boiler feedwater is increased, thereby producing more high-grade medium and high-pressure steam as a byproduct.

[0019] 5. The dynamic adjustable heat recovery device of this utility model allows for flexible adjustment of the medium-pressure demineralized water flow rate and preheating temperature according to the overall plant heat balance requirements.

[0020] 6. The dynamic adjustable heat recovery device of this invention allows for flexible adjustment of the low-pressure demineralized water flow rate and preheating temperature according to the overall plant heat balance requirements.

[0021] 7. By adopting the dynamic adjustable heat recovery device of this utility model, the system resistance drop of the conversion section is significantly reduced, saving power consumption in subsequent compression.

[0022] 8. By adopting the dynamic adjustable heat recovery device of this utility model, energy-saving renovations can be carried out in existing factories, and the energy utilization rate can be greatly improved. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a conventional heat recovery conversion device.

[0024] Figure 2 This is a schematic diagram of the process of the dynamically adjustable conversion heat recovery device of this utility model. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0026] Taking a 300,000-ton-per-year coal-to-synthetic ammonia project as an example, see [link / reference]. Figure 2 The dynamically adjustable heat recovery device shown in the figure includes: a low-pressure waste boiler E1, a boiler feedwater heater E2, a medium-pressure demineralized water heater E3, a low-pressure demineralized water heater E4, a shift gas water cooler E5, a medium-pressure waste boiler E6, a first water separator V1, a second water separator V2, and an ammonia washing tower T1. The newly added medium-pressure waste boiler E6 operates in series and parallel with the low-pressure waste boiler E1. The boiler feedwater heater E2 operates in parallel with the medium-pressure waste boiler E6 and the low-pressure waste boiler E1. The low-pressure demineralized water heater E4 operates in parallel with the medium-pressure demineralized water heater E3.

[0027] Specifically as follows: The medium-pressure waste heat boiler E6 has a first shift gas inlet E61, a first shift gas outlet E62, a first feedwater inlet E63, and a medium-pressure steam outlet E64.

[0028] The low-pressure waste heat boiler E1 has a second shift gas inlet E11, a second shift gas outlet E12, a second water supply inlet E13, and a low-pressure steam outlet E14.

[0029] The boiler feedwater heater E2 has a third feedwater inlet E21, a third feedwater outlet E22, a third shift gas inlet E23, and a third shift gas outlet E24.

[0030] The first water separator V1 has a fourth shift gas inlet V11, a fourth shift gas outlet V12, and a first condensate outlet V13.

[0031] The medium-pressure demineralized water heater E3 has a fifth shift gas inlet E31, a fifth shift gas outlet E32, a medium-pressure demineralized water inlet E33, and a medium-pressure demineralized water outlet E34.

[0032] The low-pressure demineralized water heater E4 has a sixth shift gas inlet E41, a sixth shift gas outlet E42, a low-pressure demineralized water inlet E43, and a low-pressure demineralized water outlet E44.

[0033] The second water separator V2 has a seventh shift gas inlet V21, a seventh shift gas outlet V22, and a second condensate outlet V23.

[0034] The gas-cooled water cooler E5 has an eighth gas inlet E51, an eighth gas outlet E52, a cooling water inlet E53, and a cooling water outlet E54.

[0035] The ammonia washing tower T1 has a ninth shift gas outlet T11 at the top, a cold boiler feedwater inlet T12 at the top, a ninth shift gas inlet T13 in the middle, and a third condensate outlet T14 at the bottom.

[0036] Water from the medium-pressure waste boiler E6 enters the medium-pressure waste boiler E6 through the first water inlet E63 and exchanges heat with the shifted gas entering the medium-pressure waste boiler E6 through the first shifted gas inlet E61. The shifted gas after heat exchange is sent out through the first shifted gas outlet E62, and the medium-pressure steam formed after heat exchange is sent out through the medium-pressure steam outlet E64. The first shifted gas inlet E61 and the first shifted gas outlet E62 of the medium-pressure waste boiler E6 are connected through a bypass pipeline E65, and a bypass valve E66 is installed on the bypass pipeline E65.

[0037] Water from the low-pressure waste boiler E1 enters the low-pressure waste boiler E1 through the second water inlet E13 and exchanges heat with the shifted gas entering the low-pressure waste boiler E1 through the second shifted gas inlet E11. The shifted gas after heat exchange is sent out through the second shifted gas outlet E12, and the low-pressure steam formed after heat exchange is sent out through the low-pressure steam outlet E14. The second shifted gas inlet E11 is connected to the first shifted gas outlet E62.

[0038] Water fed into boiler feedwater heater E2 through the third feedwater inlet E21 exchanges heat with shifted gas entering boiler feedwater heater E2 through the third shifted gas inlet E23, and is then heated before being sent to the first feedwater inlet E63 of medium-pressure waste boiler E6 and the second feedwater inlet E13 of low-pressure waste boiler E1 through the third feedwater outlet E22. The third shifted gas inlet E23 is connected to the first shifted gas inlet E61 of medium-pressure waste boiler E6, and the third shifted gas outlet E24 is connected to the second shifted gas outlet E12 of low-pressure waste boiler E1.

[0039] The fourth shift gas inlet V11 is connected to the second shift gas outlet E12; The medium-pressure demineralized water entering the medium-pressure demineralized water heater E3 through the medium-pressure demineralized water inlet E33 exchanges heat with the shifted gas entering the medium-pressure demineralized water heater E3 through the fifth shifted gas inlet E31, and is then sent out through the medium-pressure demineralized water outlet E34. The shifted gas after heat exchange is sent out through the fifth shifted gas outlet E32. The fifth shifted gas inlet E31 is connected to the fourth shifted gas outlet V12 of the first water separator V1.

[0040] The low-pressure demineralized water entering the low-pressure demineralized water heater E4 through the low-pressure demineralized water inlet E43 exchanges heat with the shifted gas entering the low-pressure demineralized water heater E4 through the sixth shifted gas inlet E41, and is then sent out from the low-pressure demineralized water outlet E44. The shifted gas after heat exchange is sent out from the sixth shifted gas outlet E42. The sixth shifted gas inlet E41 is connected to the fourth shifted gas outlet V12 of the first water separator V1.

[0041] The first condensate outlet V13 and the second condensate outlet V23 are connected to the condensate delivery pipeline N1, and the seventh shift gas inlet V21 is connected to the fifth shift gas outlet E32 and the sixth shift gas outlet E42.

[0042] The eighth gas inlet E51 is connected to the seventh gas outlet V22. The cooling water entering the gas water cooler E5 through the cooling water inlet E53 exchanges heat with the gas entering the gas water cooler E5 through the eighth gas inlet E51. The cooling water is then sent out from the cooling water outlet E54, and the heat-exchanged gas is sent out from the eighth gas outlet E52.

[0043] The ninth shift gas inlet T13 is connected to the eighth shift gas outlet E52. The cold boiler water entering from the cold boiler feed water inlet T12 washes away the ammonia in the shift gas in the ammonia washing tower T1. The shift gas after ammonia removal is sent out for purification through the ninth shift gas outlet T11. The condensate is sent to the condensate delivery pipeline N1 through the third condensate outlet T14.

[0044] The process of this utility model is briefly described as follows: The converter gas exiting the converter is at ~270℃, with a flow rate of ~256,500 Nm³. 3The steam output is divided into two streams. One stream produces 2.0 MPa of saturated steam as a byproduct from the advanced medium-pressure waste boiler E6. By opening the reserved bypass valve E66, a portion of the steam is routed through the bypass pipeline E65, thus enabling the medium-pressure waste boiler E6 and the low-pressure waste boiler E1 to operate in series and parallel. The low-pressure waste boiler E1 produces 0.5 MPa of saturated steam as a byproduct. The output of medium-pressure and low-pressure steam is dynamically adjusted according to the overall plant steam balance requirements. The medium-pressure steam output can be dynamically adjusted from 0 t / h to 15 t / h, and the low-pressure steam output can be dynamically adjusted from 50 t / h to 65 t / h. The other stream... The boiler feedwater heater E2 heats the boiler feedwater to 240℃. The boiler feedwater heater and the 0.5MPag low-pressure waste boiler are designed in parallel in the process flow, increasing the boiler feedwater heating temperature by approximately 100℃ compared to a series design. The feedwater can be sent to the external medium- and high-pressure waste boiler, generating an additional 10t / h of medium- and high-pressure steam. The preheating boiler feedwater flow rate and temperature are adjustable within a certain range based on the overall plant boiler feedwater operating load. The preheating boiler feedwater flow rate is dynamically adjusted from 15t / h to 80t / h, and the corresponding preheating temperature is dynamically adjusted from 145℃ to 240℃. The two streams of gas from the low-pressure waste boiler E1 and the boiler feedwater heater E2 are combined and sent to the first water separator V1 for gas-liquid separation.

[0045] The mixed shift gas, at 162°C, enters the first water separator V1 for gas-liquid separation. The outlet shift gas splits into two streams: one enters the medium-pressure demineralized water heater E3 to recover heat energy, preheating 1.2 MPa of demineralized water to 145°C; the other enters the low-pressure demineralized water heater E4 to recover heat energy, preheating 0.6 MPa of demineralized water to 94°C. The flow rates and temperatures of the medium-pressure and low-pressure demineralized water are flexibly adjusted according to the plant's overall heat balance requirements. The medium-pressure demineralized water flow rate can be dynamically adjusted from 90 t / h to 140 t / h, with a corresponding preheating temperature dynamically adjusted from 90°C to 145°C. The low-pressure demineralized water flow rate can be dynamically adjusted from 130 t / h to 200 t / h, with a corresponding preheating temperature dynamically adjusted from 75°C to 95°C. The two gas streams from the medium-pressure demineralized water heater E3 and the low-pressure demineralized water heater E4 are then combined and sent to the second water separator V2 for gas-liquid separation.

[0046] After the above-mentioned mixed shift gas enters the second water separator V2 at 60°C to separate the process condensate, the outlet shift gas is finally cooled to 35°C by the shift gas water cooler E5, and then the shift gas enters the ammonia washing tower T1 for washing.

[0047] This scheme adopts a series-parallel or parallel process configuration, which can reduce the resistance by 80 kPa compared with the pure series scheme. It is expected to save about 1 t / h of power steam consumed by the downstream unit compressor, thereby achieving the purpose of energy saving and consumption reduction.

Claims

1. A dynamically adjustable conversion heat recovery device, comprising: The invention comprises a low-pressure waste boiler, a boiler feedwater heater, a medium-pressure demineralized water heater, a low-pressure demineralized water heater, a shift gas water cooler, a medium-pressure waste boiler, a first water separator, a second water separator, and an ammonia washing tower, characterized in that it further includes a medium-pressure waste boiler, wherein the medium-pressure waste boiler and the low-pressure waste boiler are connected in series and parallel, the boiler feedwater heater is connected in parallel with the medium-pressure waste boiler and the low-pressure waste boiler, and the low-pressure demineralized water heater is connected in parallel with the medium-pressure demineralized water heater.

2. The dynamically adjustable conversion heat recovery device according to claim 1, characterized in that, The medium-pressure waste heat boiler has a first shift gas inlet, a first shift gas outlet, a first water inlet, and a low-pressure steam outlet. Water from the medium-pressure waste heat boiler enters through the first water inlet and exchanges heat with the shift gas entering through the first shift gas inlet. The heat-exchanged shift gas is then discharged through the first shift gas outlet, and the resulting medium-pressure steam is discharged through the medium-pressure steam outlet. The first shift gas inlet and the first shift gas outlet of the medium-pressure waste heat boiler are connected by a bypass pipeline, and a bypass valve is installed on the bypass pipeline. The low-pressure waste heat boiler has a second shift gas inlet, a second shift gas outlet, a second water inlet, and a low-pressure steam outlet. Water from the low-pressure waste heat boiler enters the boiler through the second water inlet and exchanges heat with the shift gas entering the boiler through the second shift gas inlet. The heat-exchanged shift gas is then discharged through the second shift gas outlet, and the low-pressure steam formed after the heat exchange is discharged through the low-pressure steam outlet. The second shift gas inlet is connected to the first shift gas outlet. The boiler feedwater heater has a third feedwater inlet, a third feedwater outlet, a third shift gas inlet, and a third shift gas outlet. Water fed through the third feedwater inlet exchanges heat with shift gas entering through the third shift gas inlet and is heated, then sent through the third feedwater outlet to the first feedwater inlet of the medium-pressure waste boiler and the second feedwater inlet of the low-pressure waste boiler. The third shift gas inlet is connected to the first shift gas inlet of the medium-pressure waste boiler, and the third shift gas outlet is connected to the second shift gas outlet of the low-pressure waste boiler. The first water separator has a fourth shift gas inlet, a fourth shift gas outlet and a first condensate outlet, wherein the fourth shift gas inlet is connected to the second shift gas outlet; The medium-pressure demineralized water heater has a fifth shift gas inlet, a fifth shift gas outlet, a medium-pressure demineralized water inlet, and a medium-pressure demineralized water outlet. The medium-pressure demineralized water entering through the medium-pressure demineralized water inlet exchanges heat with the shift gas entering through the fifth shift gas inlet and is then sent out through the medium-pressure demineralized water outlet. The shift gas after heat exchange is sent out through the fifth shift gas outlet. The fifth shift gas inlet is connected to the fourth shift gas outlet. The low-pressure demineralized water heater has a sixth change gas inlet, a sixth change gas outlet, a low-pressure demineralized water inlet, and a low-pressure demineralized water outlet. The low-pressure demineralized water entering through the low-pressure demineralized water inlet exchanges heat with the change gas entering through the sixth change gas inlet and is then sent out through the low-pressure demineralized water outlet. The change gas after heat exchange is sent out through the sixth change gas outlet. The sixth change gas inlet is connected to the fourth change gas outlet. The second water separator has a seventh shift gas inlet, a seventh shift gas outlet, and a second condensate outlet. The first condensate outlet and the second condensate outlet are connected to a condensate delivery pipeline. The seventh shift gas inlet is connected to the fifth shift gas outlet and the sixth shift gas outlet. The gas-changing water cooler has an eighth gas-changing inlet, an eighth gas-changing outlet, a cooling water inlet, and a cooling water outlet. The eighth gas-changing outlet is connected to the seventh gas-changing inlet. After the cooling water entering the gas-changing water cooler through the cooling water inlet exchanges heat with the gas entering the gas-changing water cooler through the eighth gas-changing inlet, the cooling water is sent out from the cooling water outlet, and the heat-exchanged gas is sent out from the eighth gas-changing outlet. The ammonia washing tower has a ninth shift gas outlet at the top, a cold boiler feedwater inlet at the top, a ninth shift gas inlet in the middle, and a third condensate outlet at the bottom. The ninth shift gas inlet is connected to the eighth shift gas outlet. The cold boiler water entering through the cold boiler feedwater inlet washes away the ammonia in the shift gas in the ammonia washing tower. The shift gas after ammonia removal is sent out for purification through the ninth shift gas outlet, and the condensate is sent to the condensate delivery pipeline through the third condensate outlet.

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