Hydrogen production pregnant solution energy recovery system for calcium carbide furnace
By using a liquid frequency transmissive device in the hydrogen production process of calcium carbide furnace, the liquid-rich pressure energy is converted into electrical energy, and the electric energy is stored and utilized, the problem of high-voltage liquid-rich energy loss is solved, and the efficient recovery and utilization of energy is achieved.
Patent Information
- Application Number
- CN202421784760.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-25
- Publication Date
- 2025-04-18
- Estimated Expiration
- 2034-07-25
AI Technical Summary
In the hydrogen production process of calcium carbide furnace gas conversion, the high-pressure rich liquid directly enters the flash tank to reduce the pressure, resulting in the loss of original pressure energy and the loss of energy.
A hydrogen-rich liquid-rich energy recovery system for calcium carbide furnaces is designed to convert the liquid-rich pressure energy into electrical energy through a hydraulic frequency transmissive device, and store and utilize the electrical energy through an energy storage cabinet to avoid energy loss.
It effectively recycles the pressure energy of rich liquid, reduces energy loss and waste, and reduces the operating costs of the enterprise.
Smart Images
Figure CN222772310U_ABST
Abstract
Description
Technical field:
[0001] The utility model belongs to the field of calcium carbide furnace hydrogen production, and in particular relates to a calcium carbide furnace hydrogen production rich liquid energy recovery system. Background technology:
[0002] In the process of producing hydrogen by calcium carbide furnace gas shift, the calcium carbide furnace gas is mainly pretreated to remove impurities, and then CO is reacted with steam to generate hydrogen and CO2 through a shift furnace. In order to obtain hydrogen with a concentration of more than 99.7% required for the downstream production of BDO, the CO2 content in the shift feed gas needs to be reduced from 36.1V% to below 5000ppm through a decarbonization process. Finally, a small amount of impurities such as nitrogen, methane, and carbon monoxide are removed through a PSA pressure swing adsorption process to obtain qualified hydrogen products.
[0003] In the decarbonization process, the CO2 in the conversion raw gas is mainly absorbed by using (MDEA) decarbonization solution in the absorption tower. The decarbonized raw gas is discharged from the top of the absorption tower to obtain a conversion gas containing less than 5000ppm CO2. The decarbonization solution after absorbing CO2 is called rich liquid, which needs to be discharged from the bottom of the absorption tower (pressure 2600KPa), and enter the multi-stage regeneration tower to regenerate the rich liquid after depressurization in the flash tank (400KPa). The regenerated rich liquid is called semi-lean liquid and lean liquid and is recycled and enters the absorption tower to absorb CO2 in the conversion raw gas. In this process, the rich liquid directly enters the flash tank to reduce the pressure, which will cause the loss of the original pressure energy and cannot be recycled in time, resulting in energy loss and waste. Utility model content:
[0004] The purpose of the utility model is to provide a calcium carbide furnace hydrogen production rich liquid energy recovery system, and overcome the above-mentioned shortcomings of the prior art, which effectively solves the existing problem of high-pressure rich liquid energy loss.
[0005] Contents of the utility model: A calcium carbide furnace hydrogen production rich liquid energy recovery system, comprising an absorption tower, the output pipe of the absorption tower is connected to a first hydraulic frequency-permeable device, the output pipe of the first hydraulic frequency-permeable device is connected to a flash tank, the output pipe of the flash tank is connected to a first regeneration tower, the output pipe of the first regeneration tower is connected to the absorption tower, a semi-lean liquid pump is installed on the output pipe of the first regeneration tower, the output circuit of the first hydraulic frequency-permeable device is connected to an energy storage cabinet, and the output circuit of the energy storage cabinet is connected to the semi-lean liquid pump.
[0006] Furthermore, a first bypass pipe is connected to the output pipe of the absorption tower, the first bypass pipe is connected to a second hydraulic frequency-permeable device, the output pipe of the second hydraulic frequency-permeable device is connected to the flash tank, and the output circuit of the second hydraulic frequency-permeable device is connected to the energy storage cabinet.
[0007] Furthermore, a second bypass pipe is connected to the output pipe of the first regeneration tower, the second bypass pipe is connected to the second regeneration tower, the output pipe of the second regeneration tower is connected to the absorption tower, a lean liquid pump is installed on the output pipe of the second regeneration tower, a branch circuit is connected to the output circuit of the energy storage cabinet, and the branch circuit is connected to the lean liquid pump.
[0008] The beneficial effects of the utility model are as follows: through the one-standby-one-on operation mode between the first hydraulic frequency-transmitting device and the second hydraulic frequency-transmitting device, the pressure energy of the rich liquid can be recovered and reused in time, thereby avoiding the loss and waste of energy and reducing the operating cost investment of the enterprise. Description of the drawings:
[0009] Figure 1 It is a schematic diagram of the overall system of the utility model;
[0010] In the figure: 1 absorption tower, 2 first hydraulic frequency-transmitting device, 3 flash tank, 4 first regeneration tower, 5 semi-lean liquid pump, 6 energy storage cabinet, 7 second hydraulic frequency-transmitting device, 8 second regeneration tower, 9 lean liquid pump, 10 calcium carbide furnace gas purification treatment system, 11 conversion furnace, 12 PSA. Specific implementation method:
[0011] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation of the present invention is now described with reference to the accompanying drawings:
[0012] like Figure 1 As shown, a calcium carbide furnace hydrogen production rich liquid energy recovery system includes an absorption tower 1, the output pipe of the absorption tower 1 is connected to a first hydraulic frequency-permeable device 2, the output pipe of the first hydraulic frequency-permeable device 2 is connected to a flash tank 3, the output pipe of the flash tank 3 is connected to a first regeneration tower 4, the output pipe of the first regeneration tower 4 is connected to the absorption tower 1, a semi-lean liquid pump 5 is installed on the output pipe of the first regeneration tower 4, the output circuit of the first hydraulic frequency-permeable device 2 is connected to an energy storage cabinet 6, the output circuit of the energy storage cabinet 6 is connected to the semi-lean liquid pump 5, and the output pipe of the absorption tower 1 is connected to There is a first bypass pipe, the first bypass pipe is connected to the second hydraulic frequency-permeable device 7, the output pipe of the second hydraulic frequency-permeable device 7 is connected to the flash tank 3, the output circuit of the second hydraulic frequency-permeable device 7 is connected to the energy storage cabinet 6, the output pipe of the first regeneration tower 4 is connected to the second bypass pipe, the second bypass pipe is connected to the second regeneration tower 8, the output pipe of the second regeneration tower 8 is connected to the absorption tower 1, a lean liquid pump 9 is installed on the output pipe of the second regeneration tower 8, a branch circuit is connected to the output circuit of the energy storage cabinet 6, and the branch circuit is connected to the lean liquid pump 9.
[0013] Specifically, the energy carried by the high-pressure rich liquid can be recovered through the first hydraulic frequency-transmitting device 2 and the second hydraulic frequency-transmitting device 7 to generate electrical energy.
[0014] During actual use, the calcium carbide furnace gas is transported to the calcium carbide furnace gas purification system 10 for impurity removal treatment, and the pre-treated calcium carbide furnace gas is transported to the conversion furnace 11 to react with the steam in the furnace to generate hydrogen and CO2. The conversion raw gas generated in the conversion furnace 11 enters the absorption tower 1, and a decarbonization solution is used in the absorption tower 1 to absorb the CO2 in the conversion raw gas. The decarbonization raw gas is discharged from the top and transported to the PSA12 system for pressure swing adsorption treatment to finally obtain a hydrogen product. The decarbonization solution after absorbing CO2 is called rich liquid, and is discharged from the bottom of the absorption tower 1 and enters the first hydraulic permeability device 2 for energy recovery. The electric energy generated by the first hydraulic permeability device 2 is transported to the energy storage cabinet 6 for storage. The energy storage cabinet 6 stores part of the electric energy, and the other part of the electric energy is used to drive the semi-lean liquid pump 5 to operate;
[0015] When the first hydraulic permeable frequency device 2 fails and is shut down for inspection or maintenance, in order to ensure the normal operation of the entire system, the first bypass pipe connected to the output pipe of the absorption tower 1 can be opened, and the rich liquid in the absorption tower 1 flows into the spare second hydraulic permeable frequency device 7 through the first bypass pipe to continue energy recovery, and the electric energy generated by the second hydraulic permeable frequency device 7 is still transported to the energy storage cabinet 6 for storage;
[0016] A part of the semi-lean liquid generated in the first regeneration tower 4 is first sent back to the absorption tower 1 through the output pipe for use to maintain the normal operation of the system, while the other part of the semi-lean liquid is transported to the second regeneration tower 8 through the second bypass pipe to generate lean liquid. The lean liquid generated in the second regeneration tower 8 is sent back to the absorption tower 1 through the output pipe for use, thereby improving the operating efficiency of the absorption tower 1. In this process, the branch circuit connected to the output circuit of the energy storage cabinet 6 can supply part of the electric energy to the lean liquid pump 9 for driving and operating.
[0017] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A calcium carbide furnace hydrogen production rich liquid energy recovery system, characterized in that: The invention comprises an absorption tower (1), wherein the output pipe of the absorption tower (1) is connected to a first hydraulic frequency-permeable device (2), the output pipe of the first hydraulic frequency-permeable device (2) is connected to a flash tank (3), the output pipe of the flash tank (3) is connected to a first regeneration tower (4), the output pipe of the first regeneration tower (4) is connected to the absorption tower (1), a semi-lean liquid pump (5) is installed on the output pipe of the first regeneration tower (4), the output circuit of the first hydraulic frequency-permeable device (2) is connected to an energy storage cabinet (6), and the output circuit of the energy storage cabinet (6) is connected to the semi-lean liquid pump (5).
2. The energy recovery system for producing hydrogen from calcium carbide furnace rich liquid according to claim 1, characterized in that: A first bypass pipe is connected to the output pipe of the absorption tower (1), the first bypass pipe is connected to a second hydraulic frequency-permeable device (7), the output pipe of the second hydraulic frequency-permeable device (7) is connected to the flash tank (3), and the output circuit of the second hydraulic frequency-permeable device (7) is connected to the energy storage cabinet (6).
3. The energy recovery system for producing hydrogen from calcium carbide furnace rich liquid according to claim 2, characterized in that: The output pipe of the first regeneration tower (4) is connected to a second bypass pipe, the second bypass pipe is connected to a second regeneration tower (8), the output pipe of the second regeneration tower (8) is connected to the absorption tower (1), a lean liquid pump (9) is installed on the output pipe of the second regeneration tower (8), a branch circuit is connected to the output circuit of the energy storage cabinet (6), and the branch circuit is connected to the lean liquid pump (9).