Coal-to-sng desulfurization tank desulfurizer temperature control system

Abstract

The utility model discloses coal -made natural gas desulfurization tank in desulfurizer temperature control system, including first desulfurization tank, the nitrogen tube and first exhaust pipe are communicated on first desulfurization tank, the last end of first exhaust pipe is linked with the torch system intercommunication, the first branch pipe is communicated on nitrogen tube, the output of first branch pipe is linked with compressor intercommunication, the output of compressor is linked with air electric heater intercommunication, the output pipeline of air electric heater is linked with first desulfurization tank intercommunication, the utility model has the beneficial effects that: by directly accessing nitrogen tube to first desulfurization tank and second desulfurization tank, and the temperature control treatment is carried out to desulfurizer, thereby reduced the input use of compressor, reduced the operation load and electric energy consumption of equipment, saved the cost input of production cost and equipment maintenance, second, through first heat exchanger and second heat exchanger can heat -recover ammonia after heat exchange, thereby realized the waste heat recovery reuse, avoided the waste of resources.

Description

Technical fields:

[0001] This utility model belongs to the field of coal-to-natural gas, and in particular relates to a temperature control system for desulfurizing agents in desulfurization tanks for coal-to-natural gas. Background technology:

[0002] In the coal-to-natural-gas production process, the desulfurization tank is a key piece of equipment mainly used to remove hydrogen sulfide (H2S) and organic sulfur. Its core function is to achieve efficient desulfurization through a catalyst layer, ensuring that the sulfur content of the final product meets the standard (usually below 50 mg / Nm³). 3 ).

[0003] The desulfurization catalyst (such as iron-manganese desulfurizer, zinc oxide desulfurizer, etc., also simply desulfurizer) fills the desulfurization tank. When the gas passes through the catalyst layer from bottom to top, the sulfides are removed by chemical adsorption or oxidation. When the desulfurizer becomes saturated, it needs to be removed and replaced. Because the reaction temperature of the desulfurizer is high (usually 300-400℃), in order to avoid burns, the high-temperature saturated desulfurizer needs to be cooled down first when cleaning it. Afterwards, the newly added desulfurizer also needs to be heated up to ensure the normal operation of the desulfurization tank.

[0004] In existing technologies, nitrogen, being an inert gas with stable chemical properties, is commonly used as a temperature control medium for desulfurizing agents. However, in practice, nitrogen is typically stored in tanks for later use. When the desulfurizing agent needs replacement, a compressor is activated to pump it into the tank to cool or heat the agent. In the continuous production of coal-to-natural gas, desulfurizing agent replacement becomes quite frequent, leading to high compressor load and energy consumption, frequent equipment failures, and disruptions to the continuous operation of the production system. This also increases production and equipment maintenance costs. Furthermore, the nitrogen used to heat the new desulfurizing agent is directly discharged, resulting in significant resource waste and further increasing production costs. Additionally, the heat absorbed by the nitrogen during the cooling of saturated desulfurizing agent is not recovered and reused, further contributing to resource waste. Summary of the Invention:

[0005] The purpose of this invention is to provide a desulfurizing agent temperature control system in a coal-to-natural gas desulfurization tank, and to overcome the shortcomings of the prior art. It effectively solves the existing problems of high operating load and high power consumption when replacing the desulfurization catalyst.

[0006] The present invention relates to a desulfurizing agent temperature control system in a coal-to-natural gas desulfurization tank, comprising a first desulfurization tank, a nitrogen pipe and a first exhaust pipe connected to the first desulfurization tank, the end of the first exhaust pipe being connected to a flare system, a first branch pipe connected to the nitrogen pipe, the output end of the first branch pipe being connected to a compressor, the output end of the compressor being connected to an air electric heater, the output pipe of the air electric heater being connected to the first desulfurization tank, a first return pipe connected to the exhaust pipe, the output end of the first return pipe being connected to a first heat exchange pipe in a first heat exchanger, and the output end of the first heat exchange pipe being connected to the first branch pipe.

[0007] Furthermore, a second branch pipe is connected to the nitrogen pipe, and the output end of the second branch pipe is connected to the second desulfurization tank. A second exhaust pipe is connected to the second desulfurization tank, and the second exhaust pipe is connected to the first exhaust pipe.

[0008] Furthermore, a branch pipe is connected to the output pipeline, and the output end of the branch pipe is connected to the second desulfurization tank. A second return pipe is connected to the second exhaust pipe, and the output end of the second return pipe is connected to the second heat exchange pipeline in the first heat exchanger. The output end of the second heat exchange pipeline is connected to the first branch pipe.

[0009] Furthermore, thermometers are installed on both the first heat exchange pipeline and the second heat exchange pipeline.

[0010] Furthermore, the output end of the first exhaust pipe is connected to the second heat exchanger, and the heat exchange output pipe in the second heat exchanger is connected to the flare system.

[0011] Furthermore, the cold source input end of the first heat exchanger is connected to the main water supply pipe, the heat source output end of the first heat exchanger is connected to the main return water pipe, a water supply branch pipe is connected to the main water supply pipe, the input end of the water supply branch pipe is connected to the cold source input end of the second heat exchanger, a return water branch pipe is connected to the main return water pipe, and the return water branch pipe is connected to the heat source output end of the second heat exchanger.

[0012] The beneficial effects of this utility model are as follows: By directly connecting the nitrogen pipe to the first and second desulfurization tanks and subjecting the desulfurizing agent to temperature control, the use of compressors is reduced, the operating load and power consumption of the equipment are lowered, and production and equipment maintenance costs are saved. Secondly, the heat energy of the ammonia gas after heat exchange can be recovered through the first and second heat exchangers, thereby realizing the recovery and reuse of waste heat and avoiding waste of resources. Attached image description:

[0013] Figure 1 This is a system structure view of the present invention;

[0014] In the diagram, 1 is the first desulfurization tank, 2 is the nitrogen pipe, 3 is the first exhaust pipe, 4 is the flare system, 5 is the first branch pipe, 6 is the compressor, 7 is the air electric heater, 701 is the output pipe, 8 is the first return pipe, 9 is the first heat exchanger, 901 is the first heat exchange pipe, 902 is the second heat exchange pipe, 10 is the second branch pipe, 11 is the second desulfurization tank, 12 is the second exhaust pipe, 13 is the diversion pipe, 14 is the second return pipe, 15 is the thermometer, 16 is the second heat exchanger, 17 is the main water supply pipe, 170 is the water supply branch pipe, 18 is the main return water pipe, and 180 is the return water branch pipe. Detailed implementation method:

[0015] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described with reference to the accompanying drawings:

[0016] like Figure 1 As shown, the desulfurizing agent temperature control system in the coal-to-natural gas desulfurization tank includes a first desulfurization tank 1. A nitrogen pipe 2 and a first exhaust pipe 3 are connected to the first desulfurization tank 1. The end of the first exhaust pipe 3 is connected to a flare system 4. A first branch pipe 5 is connected to the nitrogen pipe 2. The output end of the first branch pipe 5 is connected to a compressor 6. The output end of the compressor 6 is connected to an air electric heater 7. The output pipe 701 of the air electric heater 7 is connected to the first desulfurization tank 1. A first return pipe 8 is connected to the exhaust pipe 3. The output end of the first return pipe 8 is connected to a first heat exchange pipe 901 in a first heat exchanger 9. The output end of the first heat exchange pipe 901 is connected to the first branch pipe 5. A second branch pipe 10 is connected to the gas pipe 2. The output end of the second branch pipe 10 is connected to the second desulfurization tank 11. A second exhaust pipe 12 is connected to the second desulfurization tank 11. The second exhaust pipe 12 is connected to the first exhaust pipe 3. A diversion pipe 13 is connected to the output pipe 701. The output end of the diversion pipe 13 is connected to the second desulfurization tank 11. A second return pipe 14 is connected to the second exhaust pipe 12. The output end of the second return pipe 14 is connected to the second heat exchange pipe 902 in the first heat exchanger 9. The output end of the second heat exchange pipe 902 is connected to the first branch pipe 5. A thermometer 15 is installed on both the first heat exchange pipe 901 and the second heat exchange pipe 902.

[0017] Specifically, by directly connecting the nitrogen pipe 2 to the first desulfurization tank 1 and the second desulfurization tank 11, and by subjecting the desulfurizing agent to temperature control, the use of the compressor is reduced, the operating load and power consumption of the equipment are lowered, and production costs and equipment maintenance costs are saved.

[0018] In actual use, the low-temperature nitrogen produced in the upstream production system is diverted out through nitrogen pipe 2. When the desulfurizing agent in the first desulfurization tank 1 is saturated and needs to be shut down for cleaning and replacement, the valve corresponding to nitrogen pipe 2 is opened, so that the nitrogen in the pipe is transported into the first desulfurization tank 1. Because the low-temperature nitrogen produced in the upstream production system has a relatively high pressure, under the original system pressure, the nitrogen can pass through the waste desulfurizing agent layer and continuously cool the waste desulfurizing agent layer. When the nitrogen cools the waste desulfurizing agent layer, it will also carry out the residual waste gas in the first desulfurization tank 1. Therefore, the high-temperature nitrogen that has completed heat exchange with the waste desulfurizing agent layer is discharged into the flare system 4 through the first exhaust pipe 3 for waste gas combustion, thereby avoiding direct discharge of waste gas and environmental pollution.

[0019] Once the waste desulfurizing agent layer has cooled to a suitable temperature, workers can clean it and replace it with new desulfurizing agent into the first desulfurization tank 1. At this time, the valve corresponding to the nitrogen flow into the first desulfurization tank 1 is closed, and the valve of the first branch pipe 5 is opened. Under the compression of the compressor 6, the nitrogen pressure is increased again and it is sent to the air electric heater 7 for heating. After the nitrogen is heated, it enters the first desulfurization tank 1 through the output pipe 701. Because the nitrogen is under pressure, the gas molecule density increases, and it comes into rapid and sufficient contact with the new desulfurizing agent layer, which increases the heating rate of the desulfurizing agent layer, thereby improving the heating efficiency of the desulfurizing agent layer and shortening the compressor cycle time. The operation time of the air heater 6 and the air electric heater 7 further reduces the power consumption. Since the nitrogen gas is still at a high temperature after heating the new desulfurizing agent layer, in order to avoid thermal damage to the compressor 6 when the nitrogen gas is recycled, the valve corresponding to the first exhaust pipe 3 is closed after the nitrogen gas has finished heating and passed through the new desulfurizing agent layer. The nitrogen gas is then allowed to flow back to the first heat exchanger 9 through the first return pipe 8 for heat exchange and cooling. The cooled nitrogen gas then flows back to the first branch pipe 5 through the first heat exchange pipe 901, so that the nitrogen gas can circulate to heat the new desulfurizing agent, thereby saving the amount of nitrogen gas input and further reducing the production cost.

[0020] When the first desulfurization tank 1 undergoes a long-term shutdown for maintenance, the standby second desulfurization tank 11 can be started. When the desulfurizing agent in the second desulfurization tank 11 becomes saturated and needs to be replaced, the valves in other flow directions can be closed, and the valve of the second branch pipe 10 can be opened, allowing nitrogen from the nitrogen pipe 2 to be diverted to the standby second desulfurization tank 11 to cool or heat the old and new desulfurizing agents. The nitrogen after cooling the old desulfurizing agent is then channeled through the second exhaust pipe 12 into the first exhaust pipe 3 and finally sent to the flare system 4. Since the first desulfurization tank 1 and the second desulfurization tank 11 are in a one-on-one standby state, the temperature control operation process for the desulfurizing agent in the first and second desulfurization tanks 11 is the same. The temperature control operation process for the desulfurizing agent in the second desulfurization tank 11 will not be repeated here.

[0021] like Figure 1 As shown, in the desulfurization tank of coal-to-natural gas, the desulfurizing agent temperature control system has the following connection: the output end of the first exhaust pipe 3 is connected to the second heat exchanger 16, and the heat exchange pipeline in the second heat exchanger 16 is connected to the flare system 4; the cold source input end of the first heat exchanger 9 is connected to the main water supply pipe 17, and the heat source output end of the first heat exchanger 9 is connected to the main return water pipe 18. A water supply branch pipe 170 is connected to the main water supply pipe 17, and the input end of the water supply branch pipe 170 is connected to the cold source input end of the second heat exchanger 16. A return water branch pipe 180 is connected to the main return water pipe 18, and the return water branch pipe 180 is connected to the heat source output end of the second heat exchanger 16.

[0022] Specifically, the second heat exchanger 16 can recover the heat energy of the ammonia gas after heat exchange, thereby realizing the recovery and reuse of waste heat and avoiding the waste of heat energy resources.

[0023] In actual use, when the waste desulfurizing agent in the first desulfurization tank 1 and the second desulfurization tank 11 is cooled, the ammonia gas after heat exchange is concentrated in the second heat exchanger 16 through the nitrogen pipe 2 for waste heat recovery. After the nitrogen gas is heated again, it is finally discharged into the flare system 4. In the above process, in addition to providing cooling medium to the first heat exchanger 9, the main water supply pipe 17 can also provide cooling medium to the second heat exchanger 16 through the water supply branch pipe 170. After the cooling medium in the second heat exchanger 16 has completed heat exchange, it flows into the main water supply pipe 18 through the return water branch pipe 180 and is then sent back to the boiler heating system in the living area for waste heat reuse.

[0024] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A desulfurizing agent temperature control system in a coal-to-natural gas desulfurization tank, comprising a first desulfurization tank (1), characterized in that: A nitrogen pipe (2) and a first exhaust pipe (3) are connected to the first desulfurization tank (1). The end of the first exhaust pipe (3) is connected to the flare system (4). A first branch pipe (5) is connected to the nitrogen pipe (2). The output end of the first branch pipe (5) is connected to the compressor (6). The output end of the compressor (6) is connected to the air electric heater (7). The output pipe (701) of the air electric heater (7) is connected to the first desulfurization tank (1). A first return pipe (8) is connected to the exhaust pipe (3). The output end of the first return pipe (8) is connected to the first heat exchange pipe (901) in the first heat exchanger (9). The output end of the first heat exchange pipe (901) is connected to the first branch pipe (5).

2. The desulfurizing agent temperature control system in the coal-to-natural gas desulfurization tank according to claim 1, characterized in that: A second branch pipe (10) is connected to the nitrogen pipe (2), and the output end of the second branch pipe (10) is connected to the second desulfurization tank (11). A second exhaust pipe (12) is connected to the second desulfurization tank (11), and the second exhaust pipe (12) is connected to the first exhaust pipe (3).

3. The desulfurizing agent temperature control system in the coal-to-natural gas desulfurization tank according to claim 2, characterized in that: A branch pipe (13) is connected to the output pipe (701), and the output end of the branch pipe (13) is connected to the second desulfurization tank (11). A second return pipe (14) is connected to the second exhaust pipe (12), and the output end of the second return pipe (14) is connected to the second heat exchange pipe (902) in the first heat exchanger (9). The output end of the second heat exchange pipe (902) is connected to the first branch pipe (5).

4. The desulfurizing agent temperature control system in the coal-to-natural gas desulfurization tank according to claim 3, characterized in that: Thermometers (15) are installed on both the first heat exchange pipeline (901) and the second heat exchange pipeline (902).

5. The desulfurizing agent temperature control system in the coal-to-natural gas desulfurization tank according to claim 1, characterized in that: The output end of the first exhaust pipe (3) is connected to the second heat exchanger (16), and the heat exchange output pipe in the second heat exchanger (16) is connected to the flare system (4).

6. The desulfurizing agent temperature control system in the coal-to-natural gas desulfurization tank according to claim 5, characterized in that: The cold source input end of the first heat exchanger (9) is connected to the main water supply pipe (17), and the heat source output end of the first heat exchanger (9) is connected to the return water main pipe (18). A water supply branch pipe (170) is connected to the main water supply pipe (17), and the input end of the water supply branch pipe (170) is connected to the cold source input end of the second heat exchanger (16). A return water branch pipe (180) is connected to the main water return pipe (18), and the return water branch pipe (180) is connected to the heat source output end of the second heat exchanger (16).

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