Device for coupling synthesis ammonia with excess pressure power generation from coal

Abstract

The present application relates to the technical fields of energy saving and consumption reduction and green electricity hydrogen production, and discloses a device for producing synthetic ammonia by coupling power generation with the excess pressure of synthetic ammonia produced from coal; the device comprises a carbon dioxide resolving tower, the gas outlet of the carbon dioxide resolving tower and the first gas inlet of a turbine are connected together through a first pipeline, the gas outlet of a low-pressure nitrogen buffer tank and the second gas inlet of the turbine are connected together through a second pipeline, and the power output end of the turbine and the power input end of a generator are connected together; the device has a reasonable and compact structure, is convenient to use, and through the cooperation of the carbon dioxide resolving tower, the low-pressure nitrogen buffer tank, the turbine and the electrolytic device, the excess pressure of the stripping nitrogen used in the low-temperature methanol washing and the vented carbon dioxide can be fully utilized for power generation, and the water is electrolyzed to produce hydrogen and coupled with the production of synthetic ammonia, so that the recycling of resources is realized, the device is safe and reliable, the operation is facilitated, and the production cost and the waste of resources are greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of energy conservation, emission reduction, and green electricity hydrogen production technology, and is a device for generating synthetic ammonia from residual pressure in coal-to-synthetic ammonia production coupled with power generation. Background Technology

[0002] Currently, the stripping nitrogen pressure used in the low-temperature methanol washing process for coal-to-ammonia synthesis is 0.1 MPa, and the excess carbon dioxide that needs to be vented is at a pressure of 0.23 MPa. However, the low-pressure nitrogen used in the low-temperature methanol washing process is 0.4 MPa, which is reduced to 0.1 MPa by a pressure reducing valve for use in the low-temperature methanol washing stripping process. The excess carbon dioxide is also reduced to 0.02 MPa by a pressure reducing valve for venting. In this process, the residual pressure of the low-pressure nitrogen and carbon dioxide is not effectively utilized, resulting in energy waste.

[0003] This paper discloses a wind-solar-solar-thermal multi-energy complementary hydrogen production system. To address the high cost of hydrogen production due to the strong volatility of renewable energy, this study proposes such a system and conducts in-depth research on its integration scheme, aiming to effectively overcome this technical bottleneck. By constructing unit models of the wind-solar-solar-thermal coupled water electrolysis hydrogen production system and a performance evaluation system based on multi-timescale volatility assessment, the synergistic effect of the system is quantitatively analyzed. An operational optimization model for integrated water electrolysis hydrogen production is established. Results show that the volatility of this system is optimized to 0.3585, 0.5669, and 0.4772 on daily, monthly, and annual scales, respectively, representing reductions of 12.56%, 33.61%, and 27.53% compared to the volatility of the wind-solar coupled system (0.4089 daily, 0.8539 monthly, and 0.6586 annually), indicating a significant improvement in system stability. Economic and environmental assessments show that the unit hydrogen production cost is 16.89 CNY·kgH2. -1 Its carbon emission intensity is only 3.25 kg CO2·kg H2 -1 Compared with coal-based hydrogen production and natural gas-based hydrogen production, the efficiency is reduced by 86% and 75%, respectively. The research results provide an optimized configuration scheme with engineering application value for renewable energy hydrogen production systems, and the established techno-economic evaluation framework can provide a scientific basis for the development of green hydrogen projects. Lu Jun, Guo Aoxue, Wang Kunjie, et al. Integrated research on wind-solar-photothermal coupled water electrolysis hydrogen production system [J / OL]. Journal of Chemical Industry and Engineering, 1-15 [2026-01-02].

[0004] This literature reports on the research progress of high-pressure hydrogen production via water electrolysis. High-pressure hydrogen production via water electrolysis is adaptable to hydrogen storage, transportation, and application, and is expected to reduce the overall cost of hydrogen use, making it an important direction in the field. Proton exchange membrane (PEM) water electrolysis for high-pressure hydrogen production has achieved rapid development, validating its potential in reducing gas compression energy consumption and equipment investment costs. This paper summarizes the current development status of PEM water electrolysis for high-pressure hydrogen production technology and reviews the mass transfer principle of hydrogen within the PEM and methods for inhibiting hydrogen backflow. Furthermore, the emerging research on decoupled water electrolysis can separate the hydrogen evolution reaction from the oxygen evolution reaction in time or space. Applying this technology to produce high-pressure hydrogen can fundamentally avoid the safety hazards caused by hydrogen backflow. This paper categorizes and summarizes the principles and technical characteristics of decoupled water electrolysis for hydrogen production, analyzes its advantages and current shortcomings based on existing experimental results, and proposes future development directions to promote the advancement of high-pressure hydrogen production technology via water electrolysis. Wu Jiazhe, Zhang Guoao, Chang Yuhao, Dong Boyu, Chen Yubin. Research progress on high-pressure hydrogen production by water electrolysis [J]. Journal of Engineering Science, 2025, 47(11):2309-2320.

[0005] The literature discloses the research progress of new energy green hydrogen production technology, focusing on the principles, research progress, challenges and future development trends of key technologies such as photocatalytic hydrogen production, photoelectrocatalytic hydrogen production, biomass hydrogen production and new energy water electrolysis hydrogen production. Photocatalytic hydrogen production and photoelectrocatalytic hydrogen production are both in the laboratory stage, and further breakthroughs are needed in catalyst material development and technology optimization to achieve large-scale commercial application. Biomass hydrogen production technology is currently mainly in the small-scale test and pilot stage, and future efforts should focus on process improvement and efficient treatment of by-products. New energy water electrolysis hydrogen production has achieved large-scale application, but the matching problem between fluctuating new energy and electrolyzer equipment still needs to be solved and the cost of hydrogen production further reduced. Liu Xiaojie, Liu Jun, Zhou Zuxu, Han Wenjie, Wang Guangchun, Li Wei. Current progress and future development trend of green hydrogen preparation technology based on new energy [J]. Modern Chemical Industry, 2025, 45(07):33-39.

[0006] Patent document CN219809052U discloses a comprehensive system for recovering and utilizing residual pressure energy in synthetic ammonia, solving the problem of ineffective recovery of residual pressure energy in existing synthetic ammonia systems. The technical solution includes an ammonia synthesis circuit, a high-pressure ammonia separator, a medium-pressure ammonia separator, and a liquid ammonia storage tank connected in sequence. The outlet of the ammonia synthesis circuit is connected to the high-pressure ammonia separator via a high-pressure pressure reducing valve, and the high-pressure ammonia separator is connected to the medium-pressure ammonia separator via a medium-pressure pressure reducing valve. The pipelines before and after the high-pressure pressure reducing valve are respectively connected to the inlet and outlet of the drive turbine of the liquid ammonia expansion generator set. This invention is extremely simple, has a high residual pressure energy utilization rate, allows for continuous operation, and offers high equipment reliability.

[0007] However, none of the aforementioned documents disclosed the effective utilization of the residual pressure of low-pressure nitrogen and carbon dioxide, resulting in energy waste. Therefore, there is an urgent need for a device that couples coal-to-ammonia synthesis with residual pressure power generation, which would not only fully utilize the stripped nitrogen and vented carbon dioxide residual pressure used in low-temperature methanol washing for power generation, but also couple hydrogen production through water electrolysis with ammonia synthesis, thus forming a resource recycling system. Summary of the Invention

[0008] This invention provides an apparatus for generating synthetic ammonia from coal-fired ammonia using residual pressure, which overcomes the shortcomings of the prior art and effectively solves the problem of energy waste caused by the failure to effectively utilize the residual pressure of low-pressure nitrogen and carbon dioxide in existing devices and methods.

[0009] The technical solution of this invention is achieved through the following measures: a device for coal-to-ammonia synthesis with residual pressure power generation coupling, comprising a carbon dioxide stripping tower, a low-pressure nitrogen buffer tank, a turbine, a low-temperature methanol scrubbing tower, a generator, a power grid, and an electrolysis unit; the turbine is respectively provided with a first inlet end, a second inlet end, and an outlet end; the outlet end of the carbon dioxide stripping tower and the first inlet end of the turbine are connected together by a first pipeline; the outlet end of the low-pressure nitrogen buffer tank and the second inlet end of the turbine are connected together by a second pipeline; the outlet end of the turbine and the inlet end of the low-temperature methanol scrubbing tower are connected together by a third pipeline; the power output end of the turbine and the power input end of the generator are connected together; and the power output end of the generator is sequentially connected to the power grid and the electrolysis unit.

[0010] The following are further optimizations and / or improvements to the above-mentioned technical solution: The carbon dioxide desorption tower has a carbon dioxide venting tower and a low-pressure nitrogen venting tower outside it. The outlet of the carbon dioxide desorption tower and the inlet of the carbon dioxide venting tower are connected together by a fourth pipeline, and the outlet of the low-pressure nitrogen buffer tank and the inlet of the low-pressure nitrogen venting tower are connected together by a fifth pipeline.

[0011] The electrolysis device described above has a hydrogen separation and scrubbing tower and an oxygen separation and scrubbing tower on its outer side. The electrolysis device is respectively provided with an inlet end, an outlet end, a hydrogen outlet end, and an oxygen outlet end. An electrolyte inlet pipe is connected to the inlet end of the electrolysis device, and an electrolyte outlet pipe is connected to the outlet end of the electrolysis device. The hydrogen outlet end of the electrolysis device and the inlet end of the hydrogen separation and scrubbing tower are connected together through a sixth pipeline, and the oxygen outlet end of the electrolysis device and the inlet end of the oxygen separation and scrubbing tower are connected together through a seventh pipeline; or / and, the electrolysis device is an electrolytic cell.

[0012] The hydrogen separation and scrubbing tower has a demineralized water tank and a waste liquid buffer tank on its outer side. The inlet end of the hydrogen separation and scrubbing tower and the inlet end of the oxygen separation and scrubbing tower are connected together through the eighth pipeline. A ninth pipeline is connected between the outlet end of the demineralized water tank and the eighth pipeline. The outlet end of the oxygen separation and scrubbing tower and the inlet end of the waste liquid buffer tank are connected together through the tenth pipeline. An eleventh pipeline is connected between the outlet end of the hydrogen separation and scrubbing tower and the tenth pipeline.

[0013] The waste liquid buffer tank is located outside a coal slurry preparation tank. The outlet end of the waste liquid buffer tank and the inlet end of the coal slurry preparation tank are connected together via a twelfth pipeline. A pump is installed on the twelfth pipeline; or / and, flow meters are installed on the first, second, fourth, fifth, sixth, seventh, eighth, and ninth pipelines respectively; or / and, pressure gauges are installed on the first, second, and twelfth pipelines respectively; or / and, thermometers are installed on the sixth and seventh pipelines respectively; and valves are installed on the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, and twelfth pipelines respectively.

[0014] The hydrogen separation and scrubbing tower has a hydrogen purification and adsorption tower, a flare system vent pipe, and a hydrogen compressor on its outer side. A first outlet and a second outlet are respectively located at the top of the hydrogen separation and scrubbing tower. The first outlet of the hydrogen separation and scrubbing tower and the inlet of the hydrogen purification and adsorption tower are connected by a thirteenth pipeline. The hydrogen purification and adsorption tower also has a first outlet and a second outlet. The first outlet of the hydrogen purification and adsorption tower and the inlet of the hydrogen compressor are connected by a fourteenth pipeline. The second outlet of the hydrogen purification and adsorption tower and the inlet of the flare system vent pipe are connected by a fifteenth pipeline. A sixteenth pipeline connects the second outlet of the hydrogen separation and scrubbing tower to the fifteenth pipeline.

[0015] A flow meter is installed on the fourteenth pipeline; or / and pressure gauges are installed on the fifteenth and sixteenth pipelines respectively; or / and valves are installed on the thirteenth, fourteenth, fifteenth and sixteenth pipelines respectively.

[0016] The outer side of the aforementioned oxygen separation and scrubbing tower includes an oxygen purification and adsorption tower, an ozone generator, and an oxygen venting tower. The outlet of the oxygen separation and scrubbing tower and the inlet of the oxygen purification and adsorption tower are connected together via the seventeenth pipeline. The oxygen purification and adsorption tower is equipped with a first outlet and a second outlet. The first outlet of the oxygen purification and adsorption tower and the inlet of the ozone generator are connected together via the eighteenth pipeline. The second outlet of the oxygen purification and adsorption tower and the inlet of the oxygen venting tower are connected together via the nineteenth pipeline.

[0017] A flow meter is installed on the eighteenth pipeline; or / and a pressure gauge is installed on the nineteenth pipeline; or / and valves are installed on the seventeenth, eighteenth and nineteenth pipelines respectively.

[0018] This invention has a reasonable and compact structure and is easy to use. By using a carbon dioxide stripping tower, a low-pressure nitrogen buffer tank, a turbine, and an electrolysis device in combination, it not only makes full use of the stripped nitrogen used in low-temperature methanol washing and the residual pressure of vented carbon dioxide to generate electricity, but also achieves the recycling of resources by coupling hydrogen production through water electrolysis with ammonia synthesis. It has the characteristics of safety and reliability, facilitates operation, and greatly reduces production costs and resource waste. Attached Figure Description

[0019] Appendix Figure 1 This is a process flow diagram of the present invention.

[0020] The codes in the attached diagram are as follows: 1 for carbon dioxide stripping tower, 2 for low-pressure nitrogen buffer tank, 3 for turbine, 4 for low-temperature methanol scrubbing tower, 5 for power grid, 6 for electrolysis unit, 7 for first pipeline, 8 for second pipeline, 9 for third pipeline, 10 for carbon dioxide venting tower, 11 for low-pressure nitrogen venting tower, 12 for fourth pipeline, 13 for fifth pipeline, 14 for hydrogen separation and scrubbing tower, 15 for oxygen separation and scrubbing tower, 16 for electrolyte inlet pipe, 17 for electrolyte outlet pipe, 18 for sixth pipeline, 19 for seventh pipeline, 20 for demineralized water tank, 21 for waste liquid buffer tank, 22 for eighth pipeline, 23 for... 24 is the ninth pipeline, 25 is the tenth pipeline, 26 is the eleventh pipeline, 27 is the coal slurry preparation tank, 28 is the twelfth pipeline, 29 is the pump, 30 is the flow meter, 31 is the pressure gauge, 32 is the thermometer, 33 is the hydrogen purification adsorption tower, 34 is the flare system vent pipe, 35 is the hydrogen compressor, 36 is the thirteenth pipeline, 37 is the fourteenth pipeline, 38 is the fifteenth pipeline, 39 is the sixteenth pipeline, 40 is the oxygen purification adsorption tower, 41 is the ozone generator, 42 is the oxygen vent tower, 43 is the seventeenth pipeline, 44 is the eighteenth pipeline, 45 is the nineteenth pipeline, and 46 is the generator. Detailed Implementation

[0021] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0022] In this invention, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as the positional relationships of front, back, top, bottom, left, and right, which are based on the instructions attached. Figure 1 The orientation of the layout is determined by the direction of the map.

[0023] The present invention will be further described below with reference to embodiments and accompanying drawings: As attached Figure 1 As shown, the coal-to-ammonia residual pressure power generation coupled ammonia production device includes a carbon dioxide stripping tower 1, a low-pressure nitrogen buffer tank 2, a turbine 3, a low-temperature methanol scrubbing tower 4, a generator 46, a power grid 5, and an electrolysis unit 6. The turbine 3 is equipped with a first inlet end, a second inlet end, and an outlet end. The outlet end of the carbon dioxide stripping tower 1 and the first inlet end of the turbine 3 are connected together by a first pipeline 7. The outlet end of the low-pressure nitrogen buffer tank 2 and the second inlet end of the turbine 3 are connected together by a second pipeline 8. The outlet end of the turbine 3 and the inlet end of the low-temperature methanol scrubbing tower 4 are connected together by a third pipeline 9. The power output end of the turbine 3 and the power input end of the generator 46 are connected together. The power output end of the generator 46 is connected to the power grid 5 and the electrolysis unit 6 in sequence. The carbon dioxide stripping tower 1, low-pressure nitrogen buffer tank 2, turbine 3, low-temperature methanol washing stripping tower 4, power grid 5, and electrolysis unit 6 are all existing, publicly known, and commonly used components. Thus, through the coordinated use of the carbon dioxide stripping tower 1, low-pressure nitrogen buffer tank 2, turbine 3, and electrolysis unit 6, not only is the stripped nitrogen and vented carbon dioxide residual pressure used in the low-temperature methanol washing process fully utilized for power generation, but also hydrogen production is coupled with ammonia synthesis through water electrolysis, achieving resource recycling. This method is safe and reliable, facilitates operation, and significantly reduces production costs and resource waste.

[0024] The above-mentioned coal-to-ammonia residual pressure power generation coupled with ammonia synthesis can be further optimized and / or improved according to actual needs: As attached Figure 1 As shown, there are carbon dioxide venting tower 10 and low-pressure nitrogen venting tower 11 outside the carbon dioxide desorption tower 1. The outlet end of the carbon dioxide desorption tower 1 and the inlet end of the carbon dioxide venting tower 10 are connected together through the fourth pipeline 12. The outlet end of the low-pressure nitrogen buffer tank 2 and the inlet end of the low-pressure nitrogen venting tower 11 are connected together through the fifth pipeline 13.

[0025] As attached Figure 1 As shown, the electrolysis device 6 has a hydrogen separation and scrubbing tower 14 and an oxygen separation and scrubbing tower 15 on its outer side. The electrolysis device 6 is provided with an inlet end, an outlet end, a hydrogen outlet end, and an oxygen outlet end. An electrolyte inlet pipe 16 is connected to the inlet end of the electrolysis device 6, and an electrolyte outlet pipe 17 is connected to the outlet end of the electrolysis device 6. The hydrogen outlet end of the electrolysis device 6 and the inlet end of the hydrogen separation and scrubbing tower 14 are connected together through a sixth pipeline 18, and the oxygen outlet end of the electrolysis device 6 and the inlet end of the oxygen separation and scrubbing tower 15 are connected together through a seventh pipeline 19; or / and, the electrolysis device 6 is an electrolytic cell.

[0026] As attached Figure 1As shown, the hydrogen separation and scrubbing tower 14 has a demineralized water tank 20 and a waste liquid buffer tank 21 on its outer side. The inlet end of the hydrogen separation and scrubbing tower 14 and the inlet end of the oxygen separation and scrubbing tower 15 are connected together through the eighth pipeline 22. A ninth pipeline 23 is connected between the outlet end of the demineralized water tank 20 and the eighth pipeline 22. The outlet end of the oxygen separation and scrubbing tower 15 and the inlet end of the waste liquid buffer tank 21 are connected together through the tenth pipeline 24. An eleventh pipeline 25 is connected between the outlet end of the hydrogen separation and scrubbing tower 14 and the tenth pipeline 24.

[0027] As attached Figure 1 As shown, a coal slurry preparation tank 26 is located outside the waste liquid buffer tank 21. The outlet end of the waste liquid buffer tank 21 and the inlet end of the coal slurry preparation tank 26 are connected together via a twelfth pipeline 27. A pump 28 is installed on the twelfth pipeline 27; or / and, flow meters 29 are installed on the first pipeline 7, the second pipeline 8, the fourth pipeline 12, the fifth pipeline 13, the sixth pipeline 18, the seventh pipeline 19, the eighth pipeline 22, and the ninth pipeline 23, respectively; or / and, on the... Pressure gauges 30 are installed on pipeline 7, pipeline 8 and pipeline 27 respectively; and / or thermometers 31 are installed on pipeline 18 and pipeline 19 respectively; valves 32 are installed on pipeline 7, pipeline 8, pipeline 9, pipeline 12, pipeline 13, pipeline 18, pipeline 19, pipeline 22, pipeline 23, pipeline 24, pipeline 25 and pipeline 27 respectively.

[0028] As attached Figure 1 As shown, the hydrogen separation and scrubbing tower 14 has a hydrogen purification and adsorption tower 33, a flare system vent pipe 34, and a hydrogen compressor 35 on its outer side. A first outlet and a second outlet are respectively provided on the top of the hydrogen separation and scrubbing tower 14. The first outlet of the hydrogen separation and scrubbing tower 14 and the inlet of the hydrogen purification and adsorption tower 33 are connected together through the thirteenth pipeline 36. The hydrogen purification and adsorption tower 33 has a first outlet and a second outlet. The first outlet of the hydrogen purification and adsorption tower 33 and the inlet of the hydrogen compressor 35 are connected together through the fourteenth pipeline 37. The second outlet of the hydrogen purification and adsorption tower 33 and the inlet of the flare system vent pipe 34 are connected together through the fifteenth pipeline 38. A sixteenth pipeline 39 is connected between the second outlet of the hydrogen separation and scrubbing tower 14 and the fifteenth pipeline 38.

[0029] As attached Figure 1 As shown, a flow meter 29 is installed on the fourteenth pipeline 37; and / or pressure gauges 30 are installed on the fifteenth pipeline 38 and the sixteenth pipeline 39 respectively; and / or valves 32 are installed on the thirteenth pipeline 36, the fourteenth pipeline 37, the fifteenth pipeline 38 and the sixteenth pipeline 39 respectively.

[0030] As attached Figure 1 As shown, the oxygen separation and scrubbing tower 15 has an oxygen purification and adsorption tower 40, an ozone generator 41, and an oxygen venting tower 42 on its outer side. The outlet of the oxygen separation and scrubbing tower 15 and the inlet of the oxygen purification and adsorption tower 40 are connected together through the seventeenth pipeline 43. The oxygen purification and adsorption tower 40 is provided with a first outlet and a second outlet. The first outlet of the oxygen purification and adsorption tower 40 and the inlet of the ozone generator 41 are connected together through the eighteenth pipeline 44. The second outlet of the oxygen purification and adsorption tower 40 and the inlet of the oxygen venting tower 42 are connected together through the nineteenth pipeline 45.

[0031] As attached Figure 1 As shown, a flow meter 29 is installed on the eighteenth pipeline 44; and / or a pressure gauge 30 is installed on the nineteenth pipeline 45; and / or valves 32 are installed on the seventeenth pipeline 43, the eighteenth pipeline 44 and the nineteenth pipeline 45 respectively.

[0032] Advantages of this invention: (1) The apparatus for generating ammonia from coal-to-synthetic ammonia using residual pressure power generation coupled with the present invention effectively recovers and utilizes the stripped nitrogen and vented carbon dioxide residual pressure used in the low-temperature methanol washing of coal-to-synthetic ammonia, and also uses hydrogen produced by coupled water electrolysis to return to the system to produce ammonia, thereby achieving efficient recycling of resources.

[0033] (2) The present invention is a device with simple structure, low energy consumption, environmental protection and greenness, which can effectively recover the stripped nitrogen and vented carbon dioxide residual pressure used in the methanol washing of coal-to-ammonia synthesis, so as to realize the recycling of resources.

[0034] (3) The present invention uses carbon dioxide gas with a volume of 30,000-40,000 Nm³. 3 / h, low-pressure nitrogen flow rate 20,000 Nm 3 Based on a per-hour calculation, the residual pressure device generates an average of approximately 700 kW·h of electricity per hour, with a coupled hydrogen production capacity of 500 Nm³. 3 / h; converted to ammonia 0.25t / h, based on a coal consumption of 1.6 tons of ammonia, saving 0.4t / h of raw coal; the present invention mainly utilizes the residual pressure of carbon dioxide and low-pressure nitrogen in the device to generate electricity, and the power generation can vary according to the amount of carbon dioxide and low-pressure nitrogen, and the amount of raw coal saved varies according to the type of coal in different regions.

[0035] The working process of this invention is as follows: The carbon dioxide generated by the carbon dioxide stripping tower 1 and the nitrogen in the low-pressure nitrogen buffer tank 2 drive the turbine 3 to rotate. The turbine 3 drives the generator 46 to generate electricity. The electricity generated by the generator 46 is transmitted to the park's power grid system (grid 5). The park's power grid system supplies the electrolysis device 6 with alkaline electrolyte (KOH solution). The electrolysis device 6 generates hydrogen and oxygen. The hydrogen generated by the electrolysis device 6 is washed by the hydrogen separation and washing tower 14 and purified by the hydrogen purification and adsorption tower 33. Then, it is sent to the ammonia synthesis unit through the hydrogen compressor 35. The oxygen generated by the electrolysis device 6 is washed by the oxygen separation and washing tower 15 and purified by the oxygen purification and adsorption tower 40. Then, it enters the ozone generator 41. The ozone generated is de-ozoned in the catalytic oxidation tower to reduce the COD content in the concentrated water of the park. The demineralized water washed by the hydrogen separation and washing tower 14 and the oxygen separation and washing tower 15 is washed and then enters the waste liquid buffer tank 21, and then enters the coal slurry preparation tank 26.

[0036] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A device for coupling ammonia synthesis with residual pressure power generation from coal-to-ammonia production, characterized in that... The system includes a carbon dioxide stripping tower, a low-pressure nitrogen buffer tank, a turbine, a cryogenic methanol scrubbing tower, a generator, a power grid, and an electrolysis unit. The turbine is equipped with a first inlet, a second inlet, and an outlet. The outlet of the carbon dioxide stripping tower and the first inlet of the turbine are connected together by a first pipeline. The outlet of the low-pressure nitrogen buffer tank and the second inlet of the turbine are connected together by a second pipeline. The outlet of the turbine and the inlet of the cryogenic methanol scrubbing tower are connected together by a third pipeline. The power output of the turbine and the power input of the generator are connected together. The power output of the generator is connected to the power grid and the electrolysis unit in sequence.

2. The apparatus for generating synthetic ammonia from coal-fired ammonia using residual pressure power generation according to claim 1, characterized in that... The carbon dioxide stripping tower has a carbon dioxide venting tower and a low-pressure nitrogen venting tower on its outer side. The outlet of the carbon dioxide stripping tower and the inlet of the carbon dioxide venting tower are connected together by a fourth pipeline. The outlet of the low-pressure nitrogen buffer tank and the inlet of the low-pressure nitrogen venting tower are connected together by a fifth pipeline.

3. The apparatus for coal-to-ammonia synthesis coupled with residual pressure power generation to produce synthetic ammonia according to claim 1 or 2, characterized in that... The electrolysis unit has a hydrogen separation and scrubbing tower and an oxygen separation and scrubbing tower on its outer side. The electrolysis unit is equipped with an inlet end, an outlet end, a hydrogen outlet end, and an oxygen outlet end, respectively. An electrolyte inlet pipe is connected to the inlet end of the electrolysis unit, and an electrolyte outlet pipe is connected to the outlet end of the electrolysis unit. The hydrogen outlet end of the electrolysis unit and the inlet end of the hydrogen separation and scrubbing tower are connected together through a sixth pipeline, and the oxygen outlet end of the electrolysis unit and the inlet end of the oxygen separation and scrubbing tower are connected together through a seventh pipeline; or / and, the electrolysis unit is an electrolytic cell.

4. The apparatus for coal-to-ammonia synthesis coupled with residual pressure power generation to produce synthetic ammonia according to claim 3, characterized in that... The hydrogen separation and scrubbing tower has a demineralized water tank and a waste liquid buffer tank on its outer side. The inlet of the hydrogen separation and scrubbing tower and the inlet of the oxygen separation and scrubbing tower are connected together by the eighth pipeline. The ninth pipeline is connected between the outlet of the demineralized water tank and the eighth pipeline. The outlet of the oxygen separation and scrubbing tower and the inlet of the waste liquid buffer tank are connected together by the tenth pipeline. The eleventh pipeline is connected between the outlet of the hydrogen separation and scrubbing tower and the tenth pipeline.

5. The apparatus for coal-to-ammonia synthesis coupled with residual pressure power generation to produce synthetic ammonia according to claim 4, characterized in that... A coal slurry preparation tank is located outside the waste liquid buffer tank. The outlet end of the waste liquid buffer tank and the inlet end of the coal slurry preparation tank are connected together via the twelfth pipeline, on which a pump is installed; or / and, flow meters are installed on the first, second, fourth, fifth, sixth, seventh, eighth, and ninth pipelines respectively; or / and, pressure gauges are installed on the first, second, and twelfth pipelines respectively; or / and, thermometers are installed on the sixth and seventh pipelines respectively; and valves are installed on the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, and twelfth pipelines respectively.

6. The apparatus for coal-to-ammonia synthesis coupled with residual pressure power generation to produce synthetic ammonia according to claim 3, characterized in that... The outer side of the hydrogen separation and scrubbing tower includes a hydrogen purification and adsorption tower, a flare system vent pipe, and a hydrogen compressor. A first and second outlet are located at the top of the hydrogen separation and scrubbing tower. The first outlet of the hydrogen separation and scrubbing tower and the inlet of the hydrogen purification and adsorption tower are connected by a thirteenth pipeline. The hydrogen purification and adsorption tower also has a first and second outlet. The first outlet of the hydrogen purification and adsorption tower and the inlet of the hydrogen compressor are connected by a fourteenth pipeline. The second outlet of the hydrogen purification and adsorption tower and the inlet of the flare system vent pipe are connected by a fifteenth pipeline. A sixteenth pipeline connects the second outlet of the hydrogen separation and scrubbing tower to the fifteenth pipeline.

7. The apparatus for coal-to-ammonia synthesis coupled with residual pressure power generation to produce synthetic ammonia according to claim 4 or 5, characterized in that... The outer side of the hydrogen separation and scrubbing tower includes a hydrogen purification and adsorption tower, a flare system vent pipe, and a hydrogen compressor. A first and second outlet are located at the top of the hydrogen separation and scrubbing tower. The first outlet of the hydrogen separation and scrubbing tower and the inlet of the hydrogen purification and adsorption tower are connected by a thirteenth pipeline. The hydrogen purification and adsorption tower also has a first and second outlet. The first outlet of the hydrogen purification and adsorption tower and the inlet of the hydrogen compressor are connected by a fourteenth pipeline. The second outlet of the hydrogen purification and adsorption tower and the inlet of the flare system vent pipe are connected by a fifteenth pipeline. A sixteenth pipeline connects the second outlet of the hydrogen separation and scrubbing tower to the fifteenth pipeline.

8. The apparatus for coal-to-ammonia synthesis coupled with residual pressure power generation to produce synthetic ammonia according to claim 7, characterized in that... A flow meter is installed on the fourteenth pipeline; and / or pressure gauges are installed on the fifteenth and sixteenth pipelines respectively; and / or valves are installed on the thirteenth, fourteenth, fifteenth and sixteenth pipelines respectively.

9. The apparatus for coal-to-ammonia synthesis coupled with residual pressure power generation to produce synthetic ammonia according to claim 3, characterized in that... The outer side of the oxygen separation and scrubbing tower includes an oxygen purification and adsorption tower, an ozone generator, and an oxygen venting tower. The outlet of the oxygen separation and scrubbing tower and the inlet of the oxygen purification and adsorption tower are connected together via the seventeenth pipeline. The oxygen purification and adsorption tower is equipped with a first outlet and a second outlet. The first outlet of the oxygen purification and adsorption tower and the inlet of the ozone generator are connected together via the eighteenth pipeline. The second outlet of the oxygen purification and adsorption tower and the inlet of the oxygen venting tower are connected together via the nineteenth pipeline.

10. The apparatus for generating synthetic ammonia from coal-fired ammonia using residual pressure power generation according to claim 9, characterized in that... A flow meter is installed on the eighteenth pipeline; and / or a pressure gauge is installed on the nineteenth pipeline; and / or valves are installed on the seventeenth, eighteenth and nineteenth pipelines respectively.

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