Coal treatment coupling hydrogen production system
By coupling a coal processing system with a hydrogen production system, and using a reflux pipe and regulating valve to control the fuel ratio, the storage problem when hydrogen demand decreases is solved, thus achieving cost reduction.
Patent Information
- Application Number
- CN202520224127.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-12
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2035-02-12
AI Technical Summary
When hydrogen demand decreases, existing coal-to-hydrogen systems require separate hydrogen storage, leading to high costs.
Design a coal processing coupled hydrogen production system. When hydrogen demand decreases, excess cracked gas is sent to the coal processing unit for combustion to avoid generating too much hydrogen. The fuel ratio is controlled by a reflux pipe and regulating valve to reduce the need for hydrogen storage equipment.
This allows for the avoidance of excessive hydrogen generation when hydrogen demand decreases, thereby reducing the demand and cost of hydrogen storage equipment.
Smart Images
Figure CN223723073U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of coal treatment and hydrogen production technology, especially to a coal treatment coupling hydrogen production system. BACKGROUND
[0002] Currently, the main hydrogen production methods are water electrolysis, natural gas and coal hydrogen production, and each of the three methods has its own advantages. In the process of coal hydrogen production, coal is usually dry distillation to form coal gas, and then hydrogen is generated by coal gas cryogenic adsorption process. Because the production line of hydrogen production is always in the process of generating hydrogen, when the demand for hydrogen is low, the hydrogen cannot be sold, so it is necessary to store hydrogen, which requires high storage of hydrogen, high cost, and the cost of storing hydrogen alone. UTILITY MODEL CONTENT
[0003] The technical problem to be solved by the utility model is to provide a coal treatment coupling hydrogen production system that can reduce or stop the generation of hydrogen when the demand for hydrogen is reduced, while not stopping the generation of LNG.
[0004] To solve the above problems, the utility model provides a coal treatment coupling hydrogen production system, which comprises a coal treatment unit for treating coal and generating coal gas, a coal gas cooling unit for cooling coal gas, a coal gas purification unit for purifying coal gas, a compression unit for pressurization, a pre-purification unit for removing tar, naphthalene and benzene in coal gas, a fine desulfurization unit for desulfurization, a decarburization unit for decarburization, a deep cooling liquefaction unit for converting coal gas into LNG and cracking gas, and a hydrogen production unit for converting cracking gas into hydrogen. The coal treatment unit, coal gas cooling unit, coal gas purification unit, compression unit, pre-purification unit, fine desulfurization unit, decarburization unit, deep cooling liquefaction unit and hydrogen production unit are connected in sequence by pipelines. The coal gas purification unit is also connected to the coal treatment unit by a first reflux pipe. The deep cooling liquefaction unit is also connected to the coal treatment unit by a second reflux pipe. The pipeline connecting the deep cooling liquefaction unit and the hydrogen production unit is a connecting pipe. The first reflux pipe, the second reflux pipe and the connecting pipe are all provided with a first regulating valve for regulating flow.
[0005] Further, the first reflux pipe is provided with a pressure sensor for detecting pressure, a temperature sensor for detecting temperature and a flow meter for detecting flow. The pressure sensor, temperature sensor and flow meter are located at the rear end of the first regulating valve.
[0006] Further, the second reflux pipe is also provided with a pressure reducing device for pressure reduction.
[0007] Further, the second return pipe is further provided with a pressure sensor for detecting pressure, a temperature sensor for detecting temperature and a flow meter for detecting flow, and the pressure sensor, the temperature sensor and the flow meter are located at the rear end of the first regulating valve on the second return pipe.
[0008] Further, the second return pipe is further provided with a safety valve, and the safety valve is located at the front end of the pressure reducing device.
[0009] Further, the first return pipe and the second return pipe are connected with a converging pipe, and the converging pipe is connected with a coal treatment unit.
[0010] Further, the converging pipe is provided with a second regulating valve for adjusting pressure.
[0011] Further, the converging pipe is further provided with a pressure sensor for detecting pressure, a temperature sensor for detecting temperature and a flow meter for detecting flow, and the pressure sensor, the temperature sensor and the flow meter are located at the rear end of the second regulating valve on the converging pipe.
[0012] Further, the coal treatment unit is a primary dry distillation furnace for reducing water content and volatile content in coal and a secondary dry distillation furnace for coking coal, and the primary dry distillation furnace and the secondary dry distillation furnace both generate coal gas during work.
[0013] Further, the coal treatment unit is a dry distillation furnace.
[0014] The coal treatment coupling hydrogen production system can send the excess cracking gas into the coal treatment unit for combustion when the hydrogen demand is small or zero, so that the generation of excessive hydrogen is avoided, and hydrogen does not need to be stored separately, the hydrogen storage equipment is reduced, and the cost is reduced. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 is a structure schematic view of a preferred embodiment of the coal treatment coupling hydrogen production system.
[0016] Figure 2 is a schematic view of a second return pipe provided with a safety valve, a pressure sensor, a temperature sensor, a flow meter and a pressure reducing device.
[0017] Figure 3 is a schematic view of a coal gas cooling unit.
[0018] Figure 4 is a structure schematic view of a coal gas purification unit.
[0019] Figure 5 is a structure schematic view of a decarburization unit.
[0020] The meanings of the respective reference signs in the drawings are as follows:
[0021] coal treatment unit 1, primary dry distillation furnace 11, secondary dry distillation furnace 12, coal gas cooling unit 21, coal gas purification unit 22, direct cooling tower 221, gas-liquid separator 222, primary cooler 223, electric tar precipitator 224, air blower 225, compression unit 23, pre-purification unit 24, desulfurization tower 241, ammonium sulfate saturator 242, benzene removal device 243, fine desulfurization unit 25, decarbonization unit 26, filter 261, absorption tower 262, cryogenic liquefaction unit 27, hydrogen production unit 28, first return pipe 31, second return pipe 32, confluence pipe 33, first regulating valve 41, second regulating valve 42, safety valve 43, pressure sensor 51, temperature sensor 52, flow meter 53, pressure reduction device 6. DETAILED DESCRIPTION
[0022] The present application will be further described below with reference to the drawings.
[0023] As shown in Figure 1 and Figure 2 , the preferred embodiment of the coal treatment coupled hydrogen production system of the present application comprises a coal treatment unit 1, a coal gas cooling unit 21, a coal gas purification unit 22, a compression unit 23, a pre-purification unit 24, a fine desulfurization unit 25, a decarbonization unit 26, a cryogenic liquefaction unit 27 and a hydrogen production unit 28 connected in sequence through pipelines. The coal treatment unit 1 is used to generate coal gas, and the coal treatment unit 1 forms cokes by dry distillation of coal, while producing by-product coal gas. The coal gas is sent to the coal gas cooling unit 21, which is a spray tower, for cooling and removing tar mist in the coal gas. The cooled coal gas is sent to the coal gas purification unit 22, which is used to purify the coal gas by removing sulfur, ammonia and benzene in the coal gas. The coal gas purification unit 22 is connected to the coal treatment unit 1 through a first return pipe 31, so that the purified coal gas can be sent back to the coal treatment unit 1 through the pipeline to be used as fuel for the coal treatment unit 1. The excess coal gas is sent to the compression unit 23, which is used to compress the coal gas to raise the pressure of the coal gas to 0.7 MPag, and the compression unit 23 adopts a compressor. The compressed coal gas is sent to the pre-purification unit 24, which is used to remove tar, naphthalene and benzene in the coal gas, and the pre-purification unit 24 adopts a temperature swing adsorption (TSA) process to remove tar, naphthalene and benzene to 1 mg / Nm 3 , 1 mg / Nm 3 , 10 mg / Nm 3The following is a temperature swing adsorption process, which is a prior art, and its corresponding equipment is also a prior art, so its principle and structure are not described here. The coal gas is then sent to the fine desulfurization unit 25 for further removal of sulfur from the coal gas, which removes a total of 0.1 ppm of sulfur, and the fine desulfurization unit 25 usually uses a desulfurization tower 241 for desulfurization. The desulfurized coal gas is sent to the decarbonization unit 26 for removal of carbon dioxide from the coal gas, which uses lean amine liquid to remove carbon dioxide from the coal gas to obtain coal gas with less than 50 ppm of carbon dioxide. The decarbonized coal gas is sent to the cryogenic liquefaction unit 27 for converting the coal gas into LNG and cracking gas, which can be directly sold to increase economic benefits, and the cryogenic liquefaction unit 27 is a conventional technology, and its principle and structure are not described here. The cryogenic liquefaction unit 27 is connected to the coal processing unit 1 through a second return pipe 32, so that the cracking gas can enter the coal processing unit 1 for combustion through the second return pipe 32, and the second return pipe 32 is combined with the first return pipe 31 and connected to the coal processing unit 1, reducing the amount of pipe used, i.e. the second return pipe 32 and the first return pipe 31 are connected to the common pipe 33, and the common pipe 33 sends the coal gas and the cracking gas into the coal processing unit 1. In other embodiments, the first return pipe 31 and the second return pipe 32 can also be connected to the coal processing unit 1 separately; the pipe connecting the cryogenic liquefaction unit 27 and the hydrogen production unit 28 is a connecting pipe, and the first adjusting valve 41 is arranged on the connecting pipe and the second return pipe 32 to control the flow of the connecting pipe and the second return pipe 32, and the adjusting range of the first adjusting valve 41 is from 0 to the maximum flow of the corresponding pipe, i.e. from completely closed to completely open, or from completely open to completely closed. The cracking gas is sent to the hydrogen production unit 28, which is used to convert the cracking gas into hydrogen, and the hydrogen production unit 28 uses pressure swing adsorption technology, which is a prior art, and its corresponding equipment is also a prior art, so its principle and structure are not described here.
[0024] The coal processing unit 1 is a first dry distillation furnace 11 and a second dry distillation furnace 12; the first dry distillation furnace 11 is used for upgrading to reduce the moisture and volatile matter in the coal; the second dry distillation furnace 12 is used for coking coal, i.e. coking the upgraded coal. The first dry distillation furnace 11 and the second dry distillation furnace 12 will both produce coal gas during operation. In other embodiments, only one second dry distillation furnace 12 can be included. The first dry distillation furnace 11 and the second dry distillation furnace 12 also receive fuel from the common pipe 33.
[0025] As Figure 3As shown, the coal gas cooling unit 21 includes a direct cooling tower 221, a gas-liquid separator 222, a primary cooler 223, an electric tar catcher 224 and a blower 225, which are connected in sequence. The coal gas enters the direct cooling tower 221 for cooling, which is cooled to about 84°C by ammonia water spray cooling. Then the coal gas enters the gas-liquid separator 222, which realizes gas-liquid separation, and the separated raw coal gas enters the primary cooler 223, which cools the coal gas to 22°C. The coal gas from the gas-liquid separator 222 enters the electric tar catcher 224, which traps the tar mist in the coal gas. The coal gas after removal of the tar enters the blower 225, which pressurizes the coal gas, which is then sent to the coal gas purification unit 22 for further treatment. The direct cooling tower 221, the gas-liquid separator 222, the primary cooler 223, the electric tar catcher 224 and the blower 225 are all conventional devices, and their specific structures and working principles are not described herein.
[0026] As shown in Figure 4 As shown, the coal gas purification unit 22 includes a desulfurization tower 241, an ammonium sulfate saturator 242 and a benzene removal device 243, which are connected in sequence. The coal gas enters the desulfurization tower 241, which removes the sulfur in the coal gas. The desulfurized coal gas enters the ammonium sulfate saturator 242, which removes the ammonium in the coal gas. The deammoniated coal gas enters the benzene removal device 243, which removes the benzene in the coal gas. The desulfurization tower 241, the ammonium sulfate saturator 242 and the benzene removal device 243 are conventional devices, and their specific structures and working principles are not described herein.
[0027] The first regulating valve 41, the pressure sensor 51, the temperature sensor 52 and the flow meter 53 are arranged on the first return pipe 31, and the pressure sensor 51, the temperature sensor 52 and the flow meter 53 are located at the rear end of the first regulating valve 41. In terms of the direction of the coal gas flow, the one passing first is the front, and the one passing last is the rear. The first regulating valve 41 is used to adjust the flow of the coal gas in the first return pipe 31; the pressure sensor 51 is used to detect the pressure of the first return pipe 31 in real time, so as to realize real-time understanding of the pressure of the coal gas after the first regulating valve 41; the temperature sensor 52 is used to detect the temperature in the first return pipe 31 in real time, so as to realize real-time understanding of the temperature of the coal gas after the first regulating valve 41; and the flow meter 53 is used to detect the flow in the first return pipe 31 in real time, so as to realize real-time understanding of the flow of the coal gas after the first regulating valve 41.
[0028] As shown in Figure 5As shown, the decarbonization unit 26 includes a filter 261 and an absorption tower 262. The coal gas enters the filter 261 to separate dust and free water, and then enters the bottom of the absorption tower 262. The coal gas comes into contact with the lean amine liquid sprayed from the top of the absorption tower 262 to remove carbon dioxide, resulting in coal gas containing less than 50 ppm of carbon dioxide.
[0029] like Figure 2 As shown, the second return pipe 32 is also equipped with a pressure reducing device 6, a pressure sensor 51, a temperature sensor 52 and a flow meter 53. The pressure sensor 51, the temperature sensor 52 and the flow meter 53 are located at the rear end of the first regulating valve 41. Based on the direction of the cracked gas flow, the side that passes through first is the front and the side that passes through last is the back. The pressure reducing device 6 is used to reduce the pressure in the second return pipe 32 to ensure that the pyrolysis gas sent into the coal processing unit 1 through the second return pipe 32 meets the usage requirements. The first regulating valve 41 is located at the rear end of the pressure reducing device 6. The pressure sensor 51 is used to detect the pressure in the second return pipe 32 in real time so as to understand the pressure of the pyrolysis gas after the first regulating valve 41 in real time. There are two pressure sensors 51, located at the inlet and outlet ends of the pressure reducing device 6. The first regulating valve 41 is used to regulate the flow rate of the pyrolysis gas in the second return pipe 32. The temperature sensor 52 is used to detect the temperature in the first return pipe 31 in real time so as to understand the temperature of the pyrolysis gas after the first regulating valve 41 in real time. The flow meter 53 is used to detect the flow rate in the first return pipe 31 in real time so as to understand the flow rate of the pyrolysis gas after the first regulating valve 41 in real time. The pressure sensor 51 is also provided with a safety valve 43 at its front end to increase safety. The safety valve 43 is located at the front end of the pressure sensor 51 at the front end of the first regulating valve 41. In other embodiments, the safety valve 43 can be removed. The safety valve 43 can be a regulating valve or an on / off valve. In this embodiment, the first regulating valve 41 is used.
[0030] The manifold 33 is equipped with a second regulating valve 42, a pressure sensor 51, a temperature sensor 52, and a flow meter 53. The pressure sensor 51, temperature sensor 52, and flow meter 53 are located downstream of the second regulating valve 42, with the direction of gas flow (first to the front, last to the back) as the reference. The second regulating valve 42 regulates the flow rate of gas within the manifold 33; the pressure sensor 51 detects the pressure within the manifold 33 in real time to monitor the gas pressure downstream of the second regulating valve 42; the temperature sensor 52 detects the temperature within the manifold 33 in real time to monitor the gas temperature downstream of the second regulating valve 42; and the flow meter 53 detects the flow rate within the manifold 33 in real time to monitor the gas flow rate downstream of the second regulating valve 42.
[0031] When the hydrogen demand is large, i.e. all the cracking gas is used for hydrogen production, the first regulating valve 41 provided on the connecting pipe is fully opened, the first regulating valve 41 and the safety valve 43 on the second return pipe 32 are closed, the first regulating valve 41 on the first return pipe 31 is opened and adjusted according to the return fuel flow to maintain the return fuel flow; the second regulating valve 42 is opened and adjusted according to the return fuel pressure to maintain the pressure of the return fuel at 10 kPa, i.e. maintain the pressure of the collecting pipe 33 at 10 kPa.
[0032] When the hydrogen demand is small, i.e. part of the cracking gas is used for hydrogen production, the safety valve 43 is opened, and the first regulating valve 41 provided on the connecting pipe, the first return pipe 31 and the second return pipe 32 are all opened, the first regulating valve 41 on the second return pipe 32 and the connecting pipe is adjusted according to the required amount of hydrogen sold outside, the first regulating valve 41 on the first return pipe 31 is adjusted according to the difference between the return fuel flow and the flow on the second return pipe 32 to maintain the return fuel flow; the second regulating valve 42 is opened and adjusted according to the return fuel pressure to maintain the pressure of the return fuel at 10 kPa, i.e. maintain the pressure of the collecting pipe 33 at 10 kPa.
[0033] When no hydrogen is needed, i.e. no hydrogen production is needed, the safety valve 43 is opened, and the first regulating valve 41 provided on the first return pipe 31 and the second return pipe 32 are all opened, the first regulating valve 41 on the second return pipe 32 is fully opened, the first regulating valve 41 on the first return pipe 31 is adjusted according to the difference between the return fuel flow and the flow on the second return pipe 32 to maintain the return fuel flow; the first regulating valve 41 provided on the connecting pipe is closed; the second regulating valve 42 is opened and adjusted according to the return fuel pressure to maintain the pressure of the return fuel at 10 kPa, i.e. maintain the pressure of the collecting pipe 33 at 10 kPa.
[0034] The composition ratio of the return fuel can be adjusted according to the hydrogen demand in different situations, so that when there is no hydrogen demand, excessive hydrogen can be avoided, and there is no need to store hydrogen separately, i.e. there is no need to purchase equipment for storing hydrogen, thereby reducing the cost.
[0035] The above is only an embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure, direct or indirect application in other related technical fields according to the content of the present application specification and drawings, are also within the patent protection scope of the present application.
Claims
1. A coal processing coupled hydrogen production system, characterized in that: The coal treatment unit, the coal gas cooling unit, the coal gas purification unit, the compression unit, the pre-purification unit, the fine desulfurization unit, the decarbonization unit, the deep cold liquefaction unit and the hydrogen production unit are sequentially connected by pipelines, the coal gas purification unit is further connected with the coal treatment unit by a first reflux pipeline, the deep cold liquefaction unit is further connected with the coal treatment unit by a second reflux pipeline, the pipeline connecting the deep cold liquefaction unit with the hydrogen production unit is a connecting pipeline, and the first reflux pipeline, the second reflux pipeline and the connecting pipeline are all provided with first regulating valves for regulating flow.
2. The coal treatment coupled hydrogen production system of claim 1, wherein: The first reflux pipeline is provided with a pressure sensor for detecting pressure, a temperature sensor for detecting temperature and a flow meter for detecting flow, and the pressure sensor, the temperature sensor and the flow meter are located at the rear end of the first regulating valve.
3. The coal treatment coupled hydrogen production system of claim 1, wherein: The second reflux pipeline is further provided with a pressure reducing device for reducing pressure.
4. The coal treatment coupled hydrogen production system of claim 3, wherein: The second reflux pipeline is further provided with a pressure sensor for detecting pressure, a temperature sensor for detecting temperature and a flow meter for detecting flow, and the pressure sensor, the temperature sensor and the flow meter are located at the rear end of the first regulating valve on the second reflux pipeline, and the first regulating valve on the second reflux pipeline is located at the rear end of the pressure reducing device.
5. The coal treatment coupled hydrogen production system of claim 4, wherein: The second reflux pipeline is further provided with a safety valve, and the safety valve is located at the front end of the pressure reducing device.
6. The coal treatment coupled hydrogen production system of claim 1, wherein: The first reflux pipeline and the second reflux pipeline are both connected with a converging pipeline, and the converging pipeline is connected with the coal treatment unit.
7. The coal treatment coupled hydrogen production system of claim 6, wherein: The converging pipeline is provided with a second regulating valve for regulating pressure.
8. The coal treatment coupled hydrogen production system of claim 6, wherein: The converging pipeline is further provided with a pressure sensor for detecting pressure, a temperature sensor for detecting temperature and a flow meter for detecting flow, and the pressure sensor, the temperature sensor and the flow meter are located at the rear end of the second regulating valve on the converging pipeline.
9. The coal treatment coupled hydrogen production system of claim 1, wherein: The coal treatment unit is a primary dry distillation furnace for reducing moisture and volatile matter in coal and a secondary dry distillation furnace for coking coal, and the primary dry distillation furnace and the secondary dry distillation furnace both generate coal gas during operation.
10. The coal treatment coupled hydrogen production system of claim 1, wherein: The coal treatment unit is a dry distillation furnace.