A natural gas pressure reduction and purification integrated device with waste heat utilization

Abstract

The utility model relates to natural gas processing technical field discloses a natural gas pressure reduction purification and waste heat utilization integrated device, including reaction bin, the inside of reaction bin is provided with cooling heating mechanism, both ends of reaction bin all are fixedly connected with the water collecting bin, the bottom symmetry of reaction bin is installed with the valve, one of water collecting bin and the bottom fixed connection of valve has waste liquid tank, the bottom fixed connection of another water collecting bin and valve has the regenerative bin, the side fixed connection of waste liquid tank is at the side of regenerative bin, the side fixed connection of waste liquid tank has waste liquid pipe. In the utility model, through the regeneration bin to the amine liquid regeneration treatment, and then make the impurity in amine liquid separate and recover, thereby improved the traditional natural gas purification mostly adopts the mode of replacing amine liquid, leads to the low reuse rate of amine liquid, thereby causes the problem of high operation cost.

Description

Technical Field

[0001] This utility model relates to the field of natural gas treatment technology, and in particular to an integrated device for natural gas depressurization, purification and waste heat utilization. Background Technology

[0002] During the transportation and use of natural gas, it typically contains a certain amount of acidic gases and impurities, such as carbon dioxide, hydrogen sulfide, and moisture. These impurities not only reduce the combustion efficiency of natural gas but also corrode subsequent pipelines and equipment. Therefore, natural gas needs to be purified and depressurized before entering the usage stage. Currently, amine absorption is commonly used to treat acidic components in natural gas purification. However, this process generates a large amount of heat, which, if left untreated, can easily lead to energy waste in the system. Furthermore, the rapid drop in natural gas temperature during depressurization can cause moisture and hydrocarbons in the gas to precipitate and condense, resulting in pipeline freezing or blockage and affecting the stable operation of the system. Therefore, a comprehensive device is needed that can simultaneously utilize waste heat during the natural gas depressurization and purification process.

[0003] Traditional natural gas purification methods mostly involve replacing amine solution, resulting in low amine solution reuse rates and thus high operating costs. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides an integrated device for natural gas depressurization purification and waste heat utilization, which aims to improve the problem that traditional natural gas purification mostly adopts the method of replacing amine liquid, resulting in low amine liquid reuse rate and high operating costs.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an integrated device for natural gas depressurization purification and waste heat utilization, comprising a reaction chamber, a cooling and heating mechanism inside the reaction chamber, water collection chambers fixedly connected to both ends of the reaction chamber, valves symmetrically installed at the bottom of the reaction chamber, a waste liquid tank fixedly connected to the bottom of one of the water collection chambers and the valves, a regeneration chamber fixedly connected to the bottom of the other water collection chamber and the valves, a waste liquid pipe fixedly connected to one side of the regeneration chamber on one side of the waste liquid tank, a pump installed on one side of the regeneration chamber, the output end of the pump fixedly connected to the outer wall of the feeding pipe, and an air inlet pipe, a density sensor, an air outlet pipe, and a feeding pipe sequentially installed on the top of the reaction chamber, with a low-pressure purification mechanism installed on the top of the air outlet pipe.

[0006] By adopting the above technical solution, the amine liquid is regenerated through the regeneration chamber, thereby separating and restoring the impurities in the amine liquid. This improves the problem that traditional natural gas purification methods mostly rely on replacing the amine liquid, resulting in low amine liquid reuse rate and high operating costs.

[0007] Preferably, the cooling and heating mechanism includes a plurality of cooling pipes, the outer walls of which are disposed inside the reaction chamber.

[0008] Preferably, both ends of the cooling pipe are fixedly connected to one side of the water collection tank, and a water inlet pipe is fixedly connected to one side of the water collection tank.

[0009] Preferably, a second pump is fixedly installed at one end of the water inlet pipe, and a heating pipe is fixedly connected to the input end of the second pump.

[0010] Preferably, one end of the heating tube is fixedly connected to a water outlet pipe, and one end of the water outlet pipe is fixedly connected to one side of the water collection tank.

[0011] Preferably, the low-pressure purification mechanism includes a pressure regulating valve, the input end of which is fixedly connected to the top of the first air outlet pipe, the outer wall of which is fixedly connected to the inside of the heating tube, and the output end of which is fixedly connected to a sieve plate chamber.

[0012] Preferably, a support column is fixedly connected to the top of the sieve plate bin, and the top of the support column is fixedly connected to the bottom of the pressure regulating valve. A pressure sensor is installed at the end of the pressure regulating valve away from the heating tube.

[0013] Preferably, molecular sieve plates are uniformly slidably connected inside the sieve plate compartment, an air outlet pipe is fixedly connected to one side of the sieve plate compartment, and the bottom of the sieve plate compartment is fixedly connected to the top of the waste liquid tank and the regeneration compartment.

[0014] This utility model has the following beneficial effects:

[0015] 1. In this utility model, the amine liquid is regenerated through a regeneration chamber, thereby separating and restoring the impurities in the amine liquid. This improves the problem that traditional natural gas purification methods mostly rely on replacing the amine liquid, resulting in low amine liquid reuse rate and high operating costs.

[0016] 2. In this utility model, the liquid absorbs heat and preheats the natural gas through the second pump. At the same time, the adsorption and replacement operation of the molecular sieve plate ensures that the sieve plate chamber maintains continuous purification capacity, thereby preventing overheating of the reaction, freezing and blockage of the pipeline, and poor filtration effect of natural gas impurities. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of an integrated device for natural gas depressurization, purification, and waste heat utilization proposed in this utility model;

[0018] Figure 2 This is a partial structural diagram of the cooling pipe of an integrated device for natural gas depressurization, purification, and waste heat utilization proposed in this utility model;

[0019] Figure 3 This is a partial structural diagram of a pump unit for an integrated device for natural gas depressurization, purification, and waste heat utilization proposed in this utility model.

[0020] Figure 4 This is a partial structural diagram of the pressure regulating valve of an integrated device for natural gas depressurization, purification, and waste heat utilization proposed in this utility model;

[0021] Figure 5 This is a partial structural diagram of the molecular sieve plate of an integrated device for natural gas depressurization, purification, and waste heat utilization proposed in this utility model.

[0022] Legend:

[0023] 1. Reaction chamber; 2. Water collection chamber; 3. Water inlet pipe; 4. Gas inlet pipe; 5. Density sensor; 6. Gas outlet pipe one; 7. Feeding pipe; 8. Valve; 9. Waste liquid tank; 10. Regeneration chamber; 11. Cooling pipe; 12. Water outlet pipe; 13. Gas outlet pipe two; 14. Pump one; 15. Waste liquid pipe; 16. Pump two; 17. Heating pipe; 18. Pressure regulating valve; 19. Pressure sensor; 20. Support column; 21. Sieve plate chamber; 22. Molecular sieve plate. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Reference Figures 1-5 This utility model provides an embodiment of an integrated device for natural gas depressurization, purification, and waste heat utilization, comprising a reaction chamber 1, a cooling and heating mechanism inside the reaction chamber 1, water collection chambers 2 fixedly connected to both ends of the reaction chamber 1, valves 8 symmetrically installed at the bottom of the reaction chamber 1, a waste liquid tank 9 fixedly connected to the bottom of one water collection chamber 2 and valve 8, a regeneration chamber 10 fixedly connected to the bottom of the other water collection chamber 2 and valve 8, a waste liquid tank 9 fixedly connected to one side of the regeneration chamber 10, a waste liquid pipe 15 fixedly connected to one side of the waste liquid tank 9, a pump 14 installed on one side of the regeneration chamber 10, the output end of the pump 14 fixedly connected to the outer wall of the feeding pipe 7, and an air inlet pipe 4, a density sensor 5, an air outlet pipe 6, and a feeding pipe 7 sequentially installed on the top of the reaction chamber 1, with a low-pressure purification mechanism installed on the top of the air outlet pipe 6.

[0026] Specifically, during operation, natural gas and amine liquid are fed into reaction chamber 1 through inlet pipe 4 and feed pipe 7, respectively. The amine liquid and natural gas in reaction chamber 1 react and mix, thereby separating and purifying the acidic components in the natural gas. The cooling and heating mechanism absorbs heat during the reaction of natural gas and amine liquid and transfers this heat, preheating the natural gas and preventing impurities from freezing and clogging the pipes during depressurization, thus achieving waste heat reuse. After the reaction, the natural gas flows to the low-pressure purification mechanism through outlet pipe 6. The low-pressure purification mechanism depressurizes the reacted natural gas and filters and separates impurities, thus achieving depressurization and secondary purification of the natural gas. When the density sensor 5 detects the concentration of amine liquid... When the density increases, valve 8 on regeneration chamber 10 is opened, allowing the amine liquid to flow from reaction chamber 1 to regeneration chamber 10. Regeneration chamber 10 then purifies the amine liquid. The treated amine liquid is then pumped to feed pipe 7 via pump 14 to replenish the amine liquid in reaction chamber 1. This achieves the separation and recovery of impurities in the amine liquid, realizing the regeneration and recycling of the amine liquid. When the density of the regenerated amine liquid is still too high, valve 8 on waste liquid tank 9 is opened, allowing the amine liquid to flow to waste liquid tank 9, thus achieving centralized collection of waste amine liquid. The regeneration treatment of the amine liquid through regeneration chamber 10 separates and restores impurities in the amine liquid, thereby improving upon the traditional natural gas purification method of mostly replacing amine liquid, which results in low amine liquid reuse rates and high operating costs.

[0027] Reference Figures 1-4 The cooling and heating mechanism includes several cooling pipes 11. The outer wall of the cooling pipes 11 is set inside the reaction chamber 1. Both ends of the cooling pipes 11 are fixedly connected to one side of the water collection chamber 2. A water inlet pipe 3 is fixedly connected to one side of the water collection chamber 2. A second pump 16 is fixedly installed at one end of the water inlet pipe 3. A heating pipe 17 is fixedly connected to the input end of the second pump 16. A water outlet pipe 12 is fixedly connected to one end of the heating pipe 17. One end of the water outlet pipe 12 is fixedly connected to one side of the water collection chamber 2.

[0028] Specifically, during operation, when natural gas and amine react, pump 2 16 is activated. Pump 2 16 drives the liquid in the inlet pipe 3 to flow, and then the liquid flows to the cooling pipe 11. The liquid in the cooling pipe 11 absorbs the heat of reaction, thus heating the circulating liquid. After absorbing the heat of reaction, the liquid enters the heating pipe 17 through the outlet pipe 12. The heating pipe 17 then preheats the natural gas in the low-pressure purification unit. The liquid in the heating pipe 17 then passes through pump 2 16, thus achieving the return of the circulating liquid. By using pump 2 16 to allow the liquid to absorb heat and preheat the natural gas, the phenomenon of overheating of the reaction and freezing and blockage of the pipeline caused by natural gas after pressure reduction is prevented.

[0029] Reference Figure 1 , Figure 4 , Figure 5 The low-pressure purification mechanism includes a pressure regulating valve 18. The input end of the pressure regulating valve 18 is fixedly connected to the top of the first air outlet pipe 6. The outer wall of the pressure regulating valve 18 is fixedly connected to the inside of the heating pipe 17. The output end of the pressure regulating valve 18 is fixedly connected to a sieve plate chamber 21. The top of the sieve plate chamber 21 is fixedly connected to a support column 20. The top of the support column 20 is fixedly connected to the bottom of the pressure regulating valve 18. A pressure sensor 19 is installed at the end of the pressure regulating valve 18 away from the heating pipe 17. Molecular sieve plates 22 are uniformly slidably connected inside the sieve plate chamber 21. The second air outlet pipe 13 is fixedly connected to one side of the sieve plate chamber 21. The bottom of the sieve plate chamber 21 is fixedly connected to the top of the waste liquid tank 9 and the regeneration chamber 10.

[0030] Specifically, during operation, the pressure regulating valve 18 is activated, thereby regulating the pressure of the natural gas. The pressure regulating valve 18 throttles the gas flow, gradually reducing the gas pressure and thus achieving pressure reduction. The pressure sensor 19 detects pressure changes on the outer wall of the pressure regulating valve 18, providing real-time feedback on pressure changes. After entering the sieve chamber 21, the natural gas undergoes diffusion, causing it to contact the molecular sieve plates 22, thus adsorbing and separating impurities. Once the molecular sieve plates 22 are saturated, they are removed, and new ones are inserted into the sieve chamber 21. The purified natural gas is then discharged to downstream devices through the outlet pipe 13, achieving purified gas output. Through the adsorption and replacement of the molecular sieve plates 22, the sieve chamber 21 maintains continuous purification capacity, preventing problems with poor filtration of impurities in the natural gas.

[0031] Working principle: During operation, natural gas and amine liquid enter reaction chamber 1 through inlet pipe 4 and feed pipe 7 respectively for reaction. During the reaction, pump 16 is started, which drives the liquid through inlet pipe 3 into water collection chamber 2 and then to cooling pipe 11. Cooling pipe 11 absorbs the heat generated by the reaction between amine liquid and natural gas in reaction chamber 1. The heated liquid then flows into heating pipe 17 through outlet pipe 12, thereby preheating the natural gas flowing through pressure regulating valve 18. The purified natural gas is output through outlet pipe 6, and after being depressurized by pressure regulating valve 18, it enters sieve plate chamber 21, where it is further adsorbed and purified by molecular sieve plate 22, and finally discharged through outlet pipe 13. Density sensor 5 monitors the density of amine liquid. When the density increases, the corresponding valve 8 is opened, allowing the amine liquid to flow into regeneration chamber 10 for regeneration or be discharged into waste liquid tank 9. The regenerated amine liquid is then sent back to reaction chamber 1 for recycling by pump 14 through feed pipe 7.

[0032] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An integrated device for natural gas depressurization, purification, and waste heat utilization, comprising a reaction chamber (1), characterized in that: The reaction chamber (1) is equipped with a cooling and heating mechanism. Both ends of the reaction chamber (1) are fixedly connected to a water collection chamber (2). Valves (8) are symmetrically installed at the bottom of the reaction chamber (1). One of the water collection chambers (2) and the bottom of the valve (8) are fixedly connected to a waste liquid tank (9). The other water collection chamber (2) and the bottom of the valve (8) are fixedly connected to a regeneration chamber (10). One side of the waste liquid tank (9) is fixedly connected to one side of the regeneration chamber (10). One side of the waste liquid tank (9) is fixedly connected to a waste liquid pipe (15). One side of the regeneration chamber (10) is equipped with a pump (14). The output end of the pump (14) is fixedly connected to the outer wall of the feeding pipe (7). The top of the reaction chamber (1) is sequentially equipped with an air inlet pipe (4), a density sensor (5), an air outlet pipe (6), and a feeding pipe (7). A low-pressure purification mechanism is installed at the top of the air outlet pipe (6).

2. The integrated device for natural gas depressurization, purification, and waste heat utilization according to claim 1, characterized in that: The cooling and heating mechanism includes several cooling pipes (11), the outer walls of which are arranged inside the reaction chamber (1).

3. The integrated device for natural gas depressurization, purification, and waste heat utilization according to claim 2, characterized in that: The two ends of the cooling pipe (11) are fixedly connected to one side of the water collection tank (2), and the water collection tank (2) is fixedly connected to one side of the water inlet pipe (3).

4. The integrated device for natural gas depressurization, purification, and waste heat utilization according to claim 3, characterized in that: A second pump (16) is fixedly installed at one end of the water inlet pipe (3), and a heating pipe (17) is fixedly connected to the input end of the second pump (16).

5. The integrated device for natural gas depressurization, purification, and waste heat utilization according to claim 4, characterized in that: One end of the heating tube (17) is fixedly connected to a water outlet pipe (12), and one end of the water outlet pipe (12) is fixedly connected to one side of the water collection tank (2).

6. The integrated device for natural gas depressurization, purification, and waste heat utilization according to claim 1, characterized in that: The low-pressure purification mechanism includes a pressure regulating valve (18), the input end of which is fixedly connected to the top of the outlet pipe (6), the outer wall of which is fixedly connected to the inside of the heating pipe (17), and the output end of which is fixedly connected to a sieve plate bin (21).

7. The integrated device for natural gas depressurization, purification, and waste heat utilization according to claim 6, characterized in that: The top of the sieve plate bin (21) is fixedly connected to a support column (20), the top of the support column (20) is fixedly connected to the bottom of a pressure regulating valve (18), and a pressure sensor (19) is installed at the end of the pressure regulating valve (18) away from the heating tube (17).

8. The integrated device for natural gas depressurization, purification, and waste heat utilization according to claim 7, characterized in that: Molecular sieve plates (22) are uniformly slidably connected inside the sieve plate compartment (21). An air outlet pipe (13) is fixedly connected to one side of the sieve plate compartment (21). The bottom of the sieve plate compartment (21) is fixedly connected to the top of the waste liquid tank (9) and the regeneration compartment (10).

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