Liquid nitrogen wash low-temperature fuel discharge liquid water bath reheating recovery device

Abstract

The utility model discloses a liquid nitrogen wash low-temperature fuel discharge liquid water bath reheating recovery device which comprises a liquid nitrogen wash cold box, a water bath heating assembly, a hot circulating water assembly, a cold circulating water assembly and a fuel gas outlet assembly. The hot circulating water assembly is communicated with a second liquid inlet of the water bath heating assembly, the cold circulating water assembly is communicated with a liquid outlet of the water bath heating assembly, and the fuel gas outlet assembly is communicated with a gas outlet of the water bath heating assembly. The water bath heating assembly is filled with hot circulating water through the hot circulating water assembly, low-temperature discharge liquid is reheated in the water bath heating assembly, reheated fuel gas is recycled through the fuel gas outlet assembly, heat-exchanged hot circulating water is recycled through the cold circulating water assembly, cold energy recycling is achieved, meanwhile, reheated steam consumption is reduced, and energy conservation and emission reduction are achieved. The effective heat value of the low-temperature discharge liquid is fully utilized, resources are fully utilized, and the purposes of energy conservation and up-to-standard discharge are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to resource recycling technical field, concretely relates to a liquid nitrogen washing low temperature fuel discharge liquid water bath reheating recovery device. BACKGROUND

[0002] Modern coal chemical industry synthetic ammonia production system uses liquid nitrogen washing purification process to refine synthetic gas, its principle is to utilize the difference of solubility of different gas in liquid nitrogen to purify and separate And add the process of The required cold quantity mainly utilizes the throttling expansion of medium pressure nitrogen gas provided by air separation and mixed refrigeration to obtain, after low temperature liquid nitrogen washing purification, CO, Ar, And other impurities are dissolved from gas phase to liquid nitrogen, thereby reaching the purpose of synthetic gas refining, in the design, the extreme condition is usually considered, and in actual production, the cold quantity is generally rich, and under normal circumstances, the rich cold quantity is discharged in the state of low temperature liquid phase, is naturally gasified through the buffer during discharging and is heated through the steam heat exchanger, and is finally discharged after combustion through the burning torch.

[0003] The composition of the rich cold quantity discharge liquid mainly includes And contains CO, , , Ar and the like, the temperature of the rich cold quantity is generally between -190~-180 DEG C, and the total proportion of the CO, , Gas components with high heat value reaches nearly 40%, the above treatment mode mainly considers from the aspect of eliminating environmental influence, and in the process, not only causes the waste of effective gas and the loss of cold quantity, but also needs to consume steam to reheat, and the low temperature fuel liquid sent to the torch combustion has the problem of incomplete combustion, and also causes the environmental secondary hidden danger, therefore, it is urgent to improve. INVENTION CONTENTS

[0004] In order to overcome the defects of the prior art, the utility model provides a liquid nitrogen washing low temperature fuel discharge liquid water bath reheating recovery device, hot circulating water is filled into the water bath heating assembly through the hot circulating water assembly, the low temperature discharge liquid is reheated in the water bath heating assembly, the fuel gas after reheating is recycled through the fuel gas outlet assembly, the heat exchange hot circulating water is recycled through the cold circulating water assembly, the device is relatively simple in configuration and convenient to implement, while realizing the recovery of cold quantity, reducing the steam consumption of reheating, and fully utilizing the effective heat value of the low temperature discharge liquid, the environmental influence caused by the torch combustion of the rich cold quantity discharge can be eliminated, thereby realizing the full utilization of resources, achieving the purpose of energy saving and standard discharge.

[0005] The utility model discloses the purpose through the following technical scheme realizes:

[0006] The utility model provides a kind of liquid nitrogen washing low temperature fuel discharge liquid water bath reheating recovery device, including liquid nitrogen washing cold box, it is characterized by: still including water bath heating assembly, hot circulating water component, cold circulating water component and fuel gas outlet assembly, liquid nitrogen washing cold box is connected with the first liquid inlet of water bath heating assembly by discharge liquid import component, hot circulating water component is connected with the second liquid inlet of water bath heating assembly, cold circulating water component is connected with the liquid outlet of water bath heating assembly, fuel gas outlet assembly is connected with the gas outlet of water bath heating assembly.

[0007] Further, water bath heating assembly includes water bath heater, heat exchange pipe, liquid level meter and thermometer, heat exchange pipe is installed in water bath heater, heat exchange pipe is coiled pipe, heat exchange pipe one end is connected with discharge liquid import component, liquid level meter is located in water bath heater, liquid level meter is used to measure the liquid level in water bath heater, thermometer is used to measure the temperature of circulating water in water bath heater.

[0008] Further, discharge liquid import component includes cold box outlet control valve one and water bath import control unit, cold box outlet control valve one is connected with water bath import control unit, cold box outlet control valve one is connected with liquid nitrogen washing cold box, water bath import control unit is connected with water bath heating assembly.

[0009] Further, liquid nitrogen washing cold box is also provided with cold box outlet control valve two, cold box outlet control valve two is connected with flare assembly.

[0010] Further, hot circulating water component includes hot water pool and first control valve, hot water pool is connected with water bath heating assembly by first control valve.

[0011] Further, cold circulating water component includes cold water pool, second control valve, delivery pump and third control valve, second control valve is connected with water bath heating assembly, delivery pump is connected with second control valve, third control valve is connected with delivery pump, cold water pool is connected with third control valve.

[0012] Further, fuel gas outlet assembly includes fuel gas outlet control unit and fuel gas pipeline network, fuel gas pipeline network is connected with water bath heating assembly by fuel gas outlet control unit.

[0013] Further, it also includes saturated steam import component, saturated steam import component is connected with the steam inlet of water bath heating assembly.

[0014] Further, saturated steam import component includes steam pipeline network and steam import control unit, steam pipeline network is connected with water bath heating assembly by steam import control unit.

[0015] Compared with prior art, the utility model has the beneficial effects that:

[0016] The utility model discloses a liquid nitrogen washing cold box is linked through discharging liquid import component and water bath heating component's first liquid inlet, and the hot circulating water component is linked with the second liquid inlet of water bath heating component, and the cold circulating water component is linked with the liquid outlet of water bath heating component, and the fuel gas export component is linked with the gas outlet of water bath heating component, fills the hot circulating water in water bath heating component through the hot circulating water component, and reheat is carried out to low temperature discharging liquid in water bath heating component, and the fuel gas after reheat is recycled through fuel gas export component, and the hot circulating water after heat exchange is recycled through cold circulating water component, and the device configuration is relatively simple, and the implementation is convenient, realizes the recovery cold quantity, reduces reheat steam consumption, and makes full use of low temperature discharging liquid effective calorific value, can eliminate the environmental influence that the rich cold quantity is discharged torch combustion causes simultaneously, thereby realizes the full use of resources, reaches the purpose that energy -conserving discharge reaches the standard.

[0017] The utility model discloses a liquid nitrogen washing cold box still is equipped with cold box export control valve no. 2, and cold box export control valve no. 2 is linked with torch component, and the communication between liquid nitrogen washing cold box and torch component is controlled through cold box export control valve no. 2, when low temperature fuel liquid is too much in liquid nitrogen washing cold box or water bath heating component has a problem or overhauls, can discharge low temperature fuel liquid to torch component, eliminates environmental influence.

[0018] The utility model discloses in the operation process, when the hot circulating water temperature is too low, the steam pipe network is communicated with water bath heating component through steam import control unit control, and the saturated steam is filled in water bath heating component and heats the hot circulating water, guarantees the heat exchange effect. BRIEF DESCRIPTION OF DRAWINGS

[0019] The utility model makes further explanation from the following combined with the drawing:

[0020] Figure 1 It is the structure schematic drawing of the utility model discloses a kind of liquid nitrogen washing low temperature fuel discharging liquid water bath reheat recovery device.

[0021] In the drawing:1-liquid nitrogen washing cold box;2-water bath heater;3-heat exchange tube;4-liquid level meter;5-thermometer;6-first liquid inlet;7-second liquid inlet;8-liquid outlet;9-gas outlet;10-steam inlet;11-cold box export control valve one;12-water bath import control unit;13-cold box export control valve two;14-torch component;15-hot water pool;16-first control valve;17-cold water pool;18-second control valve;19-conveying pump;20-third control valve;21-fuel gas export control unit;22-fuel gas pipe network;23-steam pipe network;24-steam import control unit. DETAILED DESCRIPTION

[0022] The preferred embodiments of the utility model are described below in combination with the drawings, and it should be understood that the preferred embodiments described herein are only used for illustrating and explaining the utility model, and are not used for limiting the utility model.

[0023] As Figure 1 The utility model discloses a kind of liquid nitrogen washing low-temperature fuel discharging liquid water bath reheat recovery devices, including liquid nitrogen washing cold box 1, water bath heating assembly, hot circulating water component, cold circulating water component, fuel gas outlet assembly and saturated steam import component, liquid nitrogen washing cold box 1 is connected with the first liquid inlet 6 of water bath heating assembly by discharging liquid import component, hot circulating water component is connected with the second liquid inlet 7 of water bath heating assembly, hot circulating water component is used to fill into hot circulating water in water bath heating assembly, cold circulating water component is connected with the liquid outlet 8 of water bath heating assembly, fuel gas outlet assembly is connected with the gas outlet 9 of water bath heating assembly, saturated steam import component is connected with the steam inlet 10 of water bath heating assembly, saturated steam import component is used to fill into saturated steam in water bath heating assembly.

[0024] Low-temperature fuel liquid in liquid nitrogen washing cold box 1 is discharged into water bath heating assembly by discharging liquid import component, simultaneously, fill into hot circulating water in water bath heating assembly by hot circulating water component, low-temperature fuel liquid and hot circulating water realize heat exchange in water bath heating assembly, after heat exchange is completed, low-temperature fuel liquid becomes gas and is discharged from water bath heating assembly by fuel gas outlet assembly, hot circulating water becomes cold water and is discharged from water bath heating assembly by cold circulating water component, in the process of heat exchange, to avoid that the temperature of hot circulating water is too low to affect heat exchange effect, fill into saturated steam in water bath heating assembly by saturated steam import component to ensure the heat exchange effect of low-temperature fuel liquid and hot circulating water.

[0025] In the utility model, liquid nitrogen washing cold box 1 is connected with the first liquid inlet 6 of water bath heating assembly by discharging liquid import component, hot circulating water component is connected with the second liquid inlet 7 of water bath heating assembly, cold circulating water component is connected with the liquid outlet 8 of water bath heating assembly, fuel gas outlet assembly is connected with the gas outlet 9 of water bath heating assembly, fill into hot circulating water in water bath heating assembly by hot circulating water component, reheat low-temperature discharging liquid in water bath heating assembly, reheat fuel gas is recycled by fuel gas outlet assembly, heat-exchanged hot circulating water is recycled by cold circulating water component, device configuration is relatively simple, and it is convenient to implement, while realizing the recovery of cold quantity, reduce reheat steam consumption, and make full use of low-temperature discharging liquid effective calorific value, while environmental influence caused by rich cold quantity external discharge flare combustion can be eliminated, to realize the full use of resources, reach the purpose of energy-saving standard discharge.

[0026] The water bath heating assembly comprises a water bath heater 2, a heat exchange pipe 3, a liquid level meter 4 and a temperature meter 5. The heat exchange pipe 3 is installed in the water bath heater 2 and is in the form of a coil pipe. One end of the heat exchange pipe 3 is connected with the discharge liquid inlet assembly, and the other end of the heat exchange pipe 3 is connected with the fuel gas outlet assembly. The liquid level meter 4 is located in the water bath heater 2 and is used to measure the liquid level in the water bath heater 2. The temperature meter 5 is used to measure the temperature of the circulating water in the water bath heater 2.

[0027] In the embodiment, the top end of the water bath heater 2 is in the form of an opening, which prevents the damage of the equipment caused by the freezing of the circulating water in the extreme case and ensures the normal operation of the device. The water bath heater 2 is composed of an outer cylinder and a bottom plate. The heat exchange pipe 3 is located in the water bath heater 2. The temperature meter 5 is inserted from the side of the outer cylinder and the temperature measuring probe of the temperature meter 5 is best inserted into the center of the water bath heater 2.

[0028] The discharge liquid inlet assembly comprises a cold box outlet control valve 11 and a water bath inlet control unit 12. The cold box outlet control valve 11 is connected with the water bath inlet control unit 12. The cold box outlet control valve 11 is connected with the liquid nitrogen washing cold box 1. The water bath inlet control unit 12 is connected with the water bath heating assembly. Under the joint action of the cold box outlet control valve 11 and the water bath inlet control unit 12, the amount of low-temperature fuel liquid discharged from the liquid nitrogen washing cold box 1 to the water bath heater 2 is controlled. The low-temperature fuel liquid is communicated with the heat exchange pipe 3 through the first liquid inlet 6.

[0029] The hot circulating water assembly comprises a hot water pool 15 and a first control valve 16. The hot water pool 15 is connected with the water bath heating assembly through the first control valve 16. The hot circulating water is controlled to enter through the first control valve 16.

[0030] The cold circulating water assembly comprises a cold water pool 17, a second control valve 18, a delivery pump 19 and a third control valve 20. The second control valve 18 is connected with the water bath heating assembly. The delivery pump 19 is connected with the second control valve 18. The third control valve 20 is connected with the delivery pump 19. The cold water pool 17 is connected with the third control valve 20. After the heat exchange is completed, the hot circulating water becomes cold circulating water. The cold circulating water in the water bath heater 2 is sent into the cold water pool 17 through the delivery pump 19.

[0031] The fuel gas outlet assembly comprises a fuel gas outlet control unit 21 and a fuel gas pipeline network 22. The fuel gas pipeline network 22 is connected with the water bath heating assembly through the fuel gas outlet control unit 21. The reheated fuel gas is sent into the boiler for blending and burning through the fuel gas pipeline network 22, so as to fully recover the heat value of the effective components of the fuel gas, realize the comprehensive recycling of resources, and avoid the secondary environmental impact caused by the incomplete combustion of the original fuel gas sent to the flare stack.

[0032] The saturated steam inlet assembly comprises a steam pipe network 23 and a steam inlet control unit 24, the steam pipe network 23 is communicated with the water bath heating assembly through the steam inlet control unit 24, when the temperature of the heat circulating water is too low, the steam pipe network 23 is communicated with the water bath heating assembly through the steam inlet control unit 24, the saturated steam is filled into the water bath heating assembly to heat the heat circulating water, so that the heat exchange effect is ensured.

[0033] In the embodiment, the water bath inlet control unit 12, the fuel gas outlet control unit 21 and the steam inlet control unit 24 are the same in structure and each comprises an instrument control valve, a front valve, a rear valve and a bypass valve.

[0034] The liquid nitrogen washing cold box 1 is further provided with a cold box outlet control valve two 13, which is communicated with a flare assembly 14, through the design, the existing technology of the liquid nitrogen washing cold box 1 processing low-temperature fuel liquid is retained, the cold box outlet control valve one 11 and the cold box outlet control valve two 13 are switched, in the normal operation, the cold box outlet control valve one 11 is opened and the cold box outlet control valve two 13 is closed, the low-temperature fuel liquid in the liquid nitrogen washing cold box 1 enters the water bath heater 2 to be heat-exchanged and treated, when the water bath heating assembly is in trouble or the low-temperature fuel liquid in the liquid nitrogen washing cold box 1 is too much, the cold box outlet control valve two 13 is opened to be treated through the flare assembly 14, so that the stable operation of the whole system is ensured.

[0035] The implementation process of the utility model is as follows:

[0036] When the device is running, first, the first control valve 16 is opened to fill the heat circulating water into the water bath heater 2, before the liquid level of the heat circulating water in the water bath heater 2 reaches the upper limit, the second control valve 18 is opened to run the delivery pump 19, the water circulation is established, the liquid level in the water bath heater 2 is measured through the liquid level meter 4, so that the opening degree of the third control valve 20 is controlled, and the liquid level in the water bath heater 2 is always controlled to be kept at After the water circulation is established, the cold box outlet control valve one 11 and the water bath inlet control unit 12 are opened, the low-temperature fuel liquid in the liquid nitrogen washing cold box 1 enters the heat exchange pipe 3 to realize heat exchange, the low-temperature fuel liquid becomes gas and is discharged from the water bath heater 2 through the gas outlet 9, the fuel gas outlet control unit 21 is opened, and the reheated fuel gas is sent into the boiler for blending combustion through the fuel gas pipe network 22.

[0037] Specifically, the temperature of the reheated fuel gas should be controlled above 20 DEG C, and the temperature of the hot circulating water should be controlled between 25-30 DEG C. During operation, if the temperature of the hot circulating water is too low (with 20 DEG C as the lower limit), the steam inlet control unit 24 is opened, and saturated steam is filled into the water bath heater 2 through the steam pipe network 23. When the temperature of the hot circulating water reaches the upper limit (with 35 DEG C as the upper limit), the steam inlet control unit 24 is closed. If the temperature of the reheated fuel gas is too low (with 20 DEG C as the lower limit), the opening degree of the fuel gas outlet control unit 21 is controlled to reduce the flow rate of the fuel gas and increase the heat exchange time.

[0038] According to calculation: with the gasification fuel liquid heat value , the discharge amount According to calculation, the annual operation time is 8000 hours, and the total annual utilization heat value is , the standard coal is tons. Through software simulation calculation, the recoverable cold quantity of the low-temperature fuel liquid is 120-130 kW, the heat transfer efficiency is 90%, the low-temperature fuel liquid is heated to 30 DEG C, and the flow rate is

[0039] Then the annual recoverable cold quantity is , the average standard coal is tons, and the total recovered standard coal is about 1381 tons / year.

[0040] The embodiments of the utility model are not limited to this, according to the above embodiment content of the utility model, using the conventional technical knowledge and usual means in the art, under the premise of not departing from the above basic technical thought of the utility model and not conflicting, the above preferred embodiment can also make other various forms of modification, replacement or combination, and the obtained other embodiments all fall within the protection scope of the utility model.​

Claims

1. A liquid nitrogen washing cryogenic fuel discharge liquid water bath reheating and recovery device, comprising a liquid nitrogen washing cold box, characterized in that: It also includes a water bath heating component, a hot circulating water component, a cold circulating water component, and a fuel gas outlet component. The liquid nitrogen washing cold box is connected to the first liquid inlet of the water bath heating component through the discharge liquid inlet component. The hot circulating water component is connected to the second liquid inlet of the water bath heating component. The cold circulating water component is connected to the liquid outlet of the water bath heating component. The fuel gas outlet component is connected to the gas outlet of the water bath heating component.

2. The liquid nitrogen washing cryogenic fuel discharge liquid water bath reheating and recovery device according to claim 1, characterized in that: The water bath heating assembly includes a water bath heater, a heat exchange tube, a level gauge, and a thermometer. The heat exchange tube is installed inside the water bath heater and is coiled. One end of the heat exchange tube is connected to the discharge liquid inlet assembly. The level gauge is located inside the water bath heater and is used to measure the liquid level inside the water bath heater. The thermometer is used to measure the temperature inside the water bath heater.

3. The liquid nitrogen washing cryogenic fuel discharge liquid water bath reheating and recovery device according to claim 1, characterized in that: The discharge liquid inlet assembly includes a cold box outlet control valve and a water bath inlet control unit. The cold box outlet control valve is connected to the water bath inlet control unit and is connected to the liquid nitrogen washing cold box. The water bath inlet control unit is connected to the water bath heating assembly.

4. The liquid nitrogen washing cryogenic fuel discharge liquid water bath reheating and recovery device according to claim 1, characterized in that: The liquid nitrogen washing cold box is also equipped with a second cold box outlet control valve, which is connected to the flare assembly.

5. The liquid nitrogen washing cryogenic fuel discharge liquid water bath reheating and recovery device according to claim 1, characterized in that: The hot water circulation assembly includes a hot water tank and a first control valve, and the hot water tank is connected to the water bath heating assembly through the first control valve.

6. The liquid nitrogen washing cryogenic fuel discharge liquid water bath reheating and recovery device according to claim 1, characterized in that: The cold circulating water assembly includes a cold water tank, a second control valve, a delivery pump, and a third control valve. The second control valve is connected to the water bath heating assembly, the delivery pump is connected to the second control valve, the third control valve is connected to the delivery pump, and the cold water tank is connected to the third control valve.

7. The liquid nitrogen washing cryogenic fuel discharge liquid water bath reheating and recovery device according to claim 2, characterized in that: The fuel gas outlet assembly includes a fuel gas outlet control unit and a fuel gas pipeline network, and the fuel gas pipeline network is connected to the water bath heating assembly through the fuel gas outlet control unit.

8. The liquid nitrogen washing cryogenic fuel discharge liquid water bath reheating and recovery device according to claim 1, characterized in that: It also includes a saturated steam inlet assembly, which is connected to the steam inlet of the water bath heating assembly.

9. The liquid nitrogen washing cryogenic fuel discharge liquid water bath reheating and recovery device according to claim 8, characterized in that: The saturated steam inlet assembly includes a steam pipeline network and a steam inlet control unit, wherein the steam pipeline network is connected to the water bath heating assembly through the steam inlet control unit.

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