Low-calorific-value fuel gas calorific value adjusting device for stabilizing combustion of hydrogen production reformer

Abstract

The utility model discloses a low-calorific-value fuel gas calorific value adjusting device for stabilizing combustion of a hydrogen conversion furnace, which comprises a high-calorific-value analytic gas buffer tank and a controller, and the high-calorific-value analytic gas buffer tank is connected with a high-calorific-value analytic gas compressor through a gas pipeline. The high-calorific-value desorption gas compressor is connected with a low-calorific-value fuel gas pipeline through a high-pressure pipeline, an electric control valve controlled by a controller is arranged on the high-pressure pipeline, a gas analyzer controlled by the controller is arranged on the low-calorific-value fuel gas pipeline, and a mixing buffer tank is arranged at the tail end of the low-calorific-value fuel gas pipeline. According to the utility model, the mode that high-calorific-value analysis gas is supplied to low-calorific-value fuel gas is adopted, the low-calorific-value fuel gas pipeline is connected with the high-pressure pipeline, the high-calorific-value analysis gas is supplied to the low-calorific-value fuel gas conveying pipeline according to the detection of the gas analyzer and the adjustment requirements of the calorific value, and then the high-calorific-value analysis gas is mixed through the mixing buffer tank; and the adjusted low-calorific-value fuel gas is conveyed to the hydrogen production reformer, so that the hydrogen production reformer can stably burn.

Description

Technical Field

[0001] This utility model belongs to the field of hydrogen production technology, specifically a device for regulating the calorific value of low-calorific-value fuel gas used to stabilize combustion in a hydrogen conversion furnace. Background Technology

[0002] PSA (Pressure Swing Adsorption) hydrogen production equipment is a technology that separates hydrogen by utilizing the difference in adsorption capacity of adsorbents for different gas components. Under high pressure, the adsorbent adsorbs impurities in the mixed gas, while hydrogen, due to its poor adsorption capacity, directly penetrates the adsorption bed and becomes the finished product gas. Typically, multiple adsorption towers are used to alternately perform steps such as adsorption, pressure equalization, reverse release, and rinsing to continuously produce hydrogen.

[0003] In the hydrogen production process of the PSA unit, the low-calorific-value desorbed gas in the adsorption tower can be used as fuel gas in the hydrogen production converter. Currently, because the composition of the low-calorific-value desorbed gas often fluctuates greatly, its calorific value fluctuates greatly. When the low-calorific-value desorbed gas is transported to the converter for combustion, its poor calorific value stability can easily cause unstable combustion in the converter, resulting in the hydrogen production unit frequently reducing its load. Utility Model Content

[0004] This invention employs a method of real-time replenishment of high-calorific-value desorbed gas to low-calorific-value fuel gas. A high-pressure pipeline for transporting high-calorific-value desorbed gas is connected to the low-calorific-value fuel gas pipeline. Based on the detection results of a gas analyzer and the adjustment requirements for calorific value, the high-calorific-value desorbed gas is replenished into the low-calorific-value fuel gas pipeline. The gas is then mixed in a mixing buffer tank to adjust the calorific value of the low-calorific-value fuel gas. Finally, the low-calorific-value fuel gas with adjusted calorific value is transported to the hydrogen production converter for combustion, thereby achieving the goal of stable combustion in the hydrogen production converter.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A device for regulating the calorific value of low-calorific-value fuel gas for stabilizing combustion in a hydrogen conversion furnace includes a high-calorific-value desorption gas buffer tank and a controller. The high-calorific-value desorption gas buffer tank is connected to a high-calorific-value desorption gas compressor via a gas transmission pipeline. The output end of the high-calorific-value desorption gas compressor is connected to a low-calorific-value fuel gas pipeline via a high-pressure pipeline. An electric regulating valve is installed on the high-pressure pipeline and is electrically connected to the output end of the controller. A gas analyzer is installed on the low-calorific-value fuel gas pipeline and is electrically connected to the input end of the controller. A mixing buffer tank is installed at the end of the low-calorific-value fuel gas pipeline.

[0007] Furthermore, a pressure sensor is installed on the low-calorific-value fuel gas pipeline, and the pressure sensor is electrically connected to the input terminal of the controller. A pressure pump is installed on the high-pressure pipeline, and the pressure pump is electrically connected to the output terminal of the controller.

[0008] Furthermore, an electric shut-off valve is installed on the high-pressure pipeline, and the electric shut-off valve is electrically connected to the output end of the controller.

[0009] Furthermore, a bypass pipe is provided on the high-pressure pipes on both sides of the electric shut-off valve, and a bypass valve is provided on the bypass pipe.

[0010] Compared with the prior art, the technical solution of this utility model has the following advantages:

[0011] 1. This utility model connects a high-pressure pipeline for conveying high-calorific-value desorption gas to a low-calorific-value fuel gas output pipeline, and analyzes the low-calorific-value fuel gas using a gas analyzer. Based on the analysis results, the detected calorific value is compared with the set calorific value index. The controller opens an electric regulating valve to replenish the low-calorific-value fuel gas pipeline with high-calorific-value desorption gas, thereby adjusting the calorific value of the low-calorific-value fuel gas, ensuring the combustion stability of the hydrogen production converter, and also realizing the function of automatic adjustment.

[0012] 2. By cooperating with the pressure sensor and the pressure pump, when the pressure sensor detects that the pressure in the low-calorific-value fuel gas pipeline is greater than the pressure in the high-pressure pipeline, the controller can control the pressure pump to pressurize the high-pressure pipeline, so that the high-calorific-value desorption gas can be smoothly supplied into the low-calorific-value fuel gas pipeline, effectively ensuring the stability of the high-calorific-value desorption gas supply. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0014] Figure 2 This is a schematic diagram of the utility model in use.

[0015] In the diagram: 1. High-calorific-value desorption gas buffer tank; 2. Gas pipeline; 3. High-calorific-value desorption gas compressor; 4. Electric regulating valve; 5. High-pressure pipeline; 6. Pressure pump; 7. Controller; 8. Bypass pipeline; 9. Bypass valve; 10. Gas analyzer; 11. Low-calorific-value fuel gas pipeline; 12. Pressure sensor; 13. Electric shut-off valve; 14. Mixing buffer tank. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0017] exist Figure 1 , Figure 2 In the structure shown, the low-calorific-value fuel gas calorific value regulating device for stabilizing combustion in a hydrogen conversion furnace provided by this utility model includes a high-calorific-value desorption gas buffer tank 1 and a controller 7. The high-calorific-value desorption gas buffer tank 1 is connected to a high-calorific-value desorption gas compressor 3 via a gas transmission pipeline 2. The output end of the high-calorific-value desorption gas compressor 3 is connected to a low-calorific-value fuel gas pipeline 11 via a high-pressure pipeline 5. The high-calorific-value desorption gas in the high-calorific-value desorption gas buffer tank 1 can be replenished to the low-calorific-value fuel gas pipeline 11 via the high-pressure pipeline 5 through the high-calorific-value desorption gas compressor 3. An electric motor is installed on the high-pressure pipeline 5. A motorized regulating valve 4 is electrically connected to the output of the controller 7. A gas analyzer 10 is installed on the low-calorific-value fuel gas pipeline 11 and is electrically connected to the input of the controller 7. A mixing buffer tank 14 is installed at the end of the low-calorific-value fuel gas pipeline 11. When the gas analyzer 10 detects and analyzes the calorific value of the low-calorific-value fuel gas and feeds it back to the controller 7, the controller 7 can control the motorized regulating valve 4 to open according to the set calorific value threshold and the calorific value adjustment requirements, and send high-calorific-value desorbed gas to the low-calorific-value fuel gas pipeline 11 according to the adjustment requirements.

[0018] A pressure sensor 12 is installed on the low-calorific-value fuel gas pipeline 11. The pressure sensor 12 is electrically connected to the input terminal of the controller 7. A pressure pump 6 is installed on the high-pressure pipeline 5. The pressure pump 6 is electrically connected to the output terminal of the controller 7. The pressure sensor 12 detects the pressure in the low-calorific-value fuel gas pipeline 11 and feeds the monitoring result back to the controller 7. The controller 7 controls the pressure pump 6 to work according to the detection result, so that the pressure in the high-pressure pipeline 5 is greater than the pressure in the low-calorific-value fuel gas pipeline 11, ensuring that the high-calorific-value desorption gas can be smoothly supplied to the low-calorific-value fuel gas pipeline 11.

[0019] An electric shut-off valve 13 is installed on the high-pressure pipeline 5. The electric shut-off valve 13 is electrically connected to the output terminal of the controller 7. When no refueling is required, the electric shut-off valve 13 can prevent low-calorific-value fuel gas from flowing into the high-pressure pipeline 5.

[0020] A bypass pipe 8 is provided on the high-pressure pipe 5 on both sides of the electric shut-off valve 13. A bypass valve 9 is provided on the bypass pipe 8. When the electric shut-off valve 13 needs to be inspected and maintained, the bypass valve 9 is opened so that the high-calorific-value desorption gas can be supplied through the bypass pipe 8.

[0021] The working principle of this utility model:

[0022] exist Figure 2 In the structure shown, during operation, the gas analyzer analyzes and detects the low-calorific-value fuel gas in the low-calorific-value fuel gas pipeline and feeds back the analysis results to the controller. The controller makes a judgment based on the set calorific-value threshold and the results fed back by the gas analyzer. If the calorific value of the delivered low-calorific-value fuel gas is lower than the set threshold, the controller controls the electric regulating valve to open. At the same time, the pressure sensor detects the pressure value in the low-calorific-value fuel gas pipeline and feeds it back to the controller. The controller controls the pressure pump to work based on the feedback result, so that the pressure value in the high-pressure pipeline is kept higher than the pressure value in the low-calorific-value fuel gas pipeline, so that the high-calorific-value desorbed gas can be supplied to supplement the low-calorific-value fuel gas and enter the mixing buffer tank for mixing, and finally delivered to the hydrogen production converter for combustion.

[0023] If the analysis result of the low-calorific-value fuel gas is greater than the set calorific-value threshold, the controller will not work, and the electric regulating valve will be closed to allow the low-calorific-value fuel gas to enter the hydrogen production converter for combustion normally. The controller will also close the electric shut-off valve to prevent the low-calorific-value fuel gas from flowing into the high-pressure pipeline.

[0024] If the electric shut-off valve is not working due to inspection or maintenance, the high-calorific-value desorption gas can be supplied through the bypass pipeline by opening the bypass valve.

[0025] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that various modifications and refinements can be made without departing from the spirit or essential characteristics of the invention, and these modifications and refinements should also be considered within the scope of protection of the present invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description; thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A device for regulating the calorific value of low-calorific-value fuel gas used in a stable hydrogen production converter, characterized in that: It includes a high-calorific-value desorption gas buffer tank (1) and a controller (7). The high-calorific-value desorption gas buffer tank (1) is connected to the high-calorific-value desorption gas compressor (3) through a gas transmission pipeline (2). The output end of the high-calorific-value desorption gas compressor (3) is connected to the low-calorific-value fuel gas pipeline (11) through a high-pressure pipeline (5). An electric regulating valve (4) is installed on the high-pressure pipeline (5). The electric regulating valve (4) is electrically connected to the output end of the controller (7). A gas analyzer (10) is installed on the low-calorific-value fuel gas pipeline (11). The gas analyzer (10) is electrically connected to the input end of the controller (7). A mixing buffer tank (14) is installed at the end of the low-calorific-value fuel gas pipeline (11).

2. The low-calorific-value fuel gas calorific value regulating device for stabilizing combustion in a hydrogen production converter according to claim 1, characterized in that: A pressure sensor (12) is installed on the low-calorific-value fuel gas pipeline (11), and the pressure sensor (12) is electrically connected to the input end of the controller (7). A pressure pump (6) is installed on the high-pressure pipeline (5), and the pressure pump (6) is electrically connected to the output end of the controller (7).

3. The low-calorific-value fuel gas calorific value regulating device for stabilizing combustion in a hydrogen production converter according to claim 1, characterized in that: An electric shut-off valve (13) is installed on the high-pressure pipeline (5), and the electric shut-off valve (13) is electrically connected to the output end of the controller (7).

4. The low-calorific-value fuel gas calorific value regulating device for stabilizing combustion in a hydrogen production converter according to claim 3, characterized in that: A bypass pipe (8) is provided on the high-pressure pipe (5) on both sides of the electric shut-off valve (13), and a bypass valve (9) is provided on the bypass pipe (8).

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