Low-temperature methanol washing solution energy recovery device
By designing the energy recovery device of the hydraulic turbine generator set in the low-temperature methanol washing technology, the problem of failure to effectively recover high-pressure liquid energy in the prior art is solved, and effective energy recovery and energy consumption reduction of the coal-to-methanol process are achieved.
Patent Information
- Application Number
- CN202420487922.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-13
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2034-03-13
AI Technical Summary
The existing low-temperature methanol washing technology fails to effectively recover the energy of high-pressure liquids, resulting in energy waste.
A low-temperature methanol washing solution energy recovery device is designed, and by installing a hydraulic turbine generator set on equipment and pipelines that require decompression, power is generated by liquid pressure drop and energy is recovered.
The energy of CO2-rich and H2S-rich methanol is effectively recovered, reducing the overall comprehensive energy consumption of the coal-to-methanol process.
Smart Images
Figure CN222605896U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of low-temperature methanol washing, in particular to a low-temperature methanol washing solution energy recovery device. Background Art
[0002] Low-temperature methanol washing uses cold methanol as the absorption solvent and utilizes the excellent property of methanol's great solubility in acidic gases at low temperatures to remove acidic gases from the raw gas. The process generally includes an absorption tower and multiple desorption towers. The absorption tower absorbs acidic gases, and the desorption tower desorbs acidic gases and returns lean liquid methanol to the absorption tower to achieve the recycling of methanol. The existing technology is that the rich methanol from the high-pressure system to the medium-pressure system and from the medium-pressure system to the sub-medium-pressure system is flashed after the pressure reducing valve is used for decompression. The energy of the high-pressure liquid is not recycled, resulting in energy waste. Utility Model Content
[0003] The utility model aims to solve the shortcomings of the prior art that the energy of high-pressure liquid is not recycled and utilized, resulting in energy waste, and proposes a low-temperature methanol washing solution energy recovery device.
[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0005] A low-temperature methanol washing solution energy recovery device is designed, comprising a first circulating gas flash tank, characterized in that a first connecting pipe is connected to the first circulating gas flash tank, the first circulating gas flash tank is connected to a third circulating gas flash tank through a third connecting pipe, the first connecting pipe is connected to a first hydraulic turbine generator set, the first hydraulic turbine generator set is connected to a second connecting pipe, the second connecting pipe is connected to a second circulating gas flash tank, the second circulating gas flash tank is connected to a fourth circulating gas flash tank through a fourth connecting pipe, and the third connecting pipe and the fourth connecting pipe are connected through the second hydraulic turbine generator set.
[0006] Preferably, the first connecting pipe, the second connecting pipe, the third connecting pipe and the fourth connecting pipe are all provided with pressure reducing valves.
[0007] The utility model proposes a low-temperature methanol washing solution energy recovery device, which has the beneficial effects of utilizing liquid pressure drop to generate electricity, recovering energy, and reducing the overall comprehensive energy consumption in the coal-to-methanol process. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] Figure 1 The utility model provides a schematic structural diagram of a low-temperature methanol washing solution energy recovery device.
[0009] In the figure: 1. first circulating gas flash tank; 2. second circulating gas flash tank; 3. third circulating gas flash tank; 4. fourth circulating gas flash tank; 5. first hydraulic turbine generator set; 6. second hydraulic turbine generator set; 7. pressure reducing valve; 8. first connecting pipe; 9. second connecting pipe; 10. third connecting pipe; 11. fourth connecting pipe. DETAILED DESCRIPTION
[0010] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.
[0011] Reference Figure 1 A low-temperature methanol washing solution energy recovery device includes a first circulating gas flash tank 1, the first circulating gas flash tank 1 is connected to a first connecting pipe 8, the first circulating gas flash tank 1 is connected to a third circulating gas flash tank 3 through a third connecting pipe 10, the first connecting pipe 8 is connected to a first hydraulic turbine generator set 5, the first hydraulic turbine generator set 5 is connected to a second connecting pipe 9, the second connecting pipe 9 is connected to a second circulating gas flash tank 2, the second circulating gas flash tank 2 is connected to a fourth circulating gas flash tank 4 through a fourth connecting pipe 11, and the third connecting pipe 10 and the fourth connecting pipe 11 are connected through a second hydraulic turbine generator set 6.
[0012] The CO2-rich methanol from the methanol scrubber is decompressed through the pressure reducing valve 7 and enters the first circulating gas flash tank 1 for decompression flashing after heat exchange and cold recovery by related equipment. The CO2-rich methanol from the first circulating gas flash tank 1 is further decompressed and flashed in the third circulating gas flash tank 3 through the pressure reducing valve, and the gas phase and liquid phase after the decompression flashing enter the back system respectively. The H2S-rich methanol from the bottom of the methanol scrubber is decompressed through the pressure reducing valve and enters the second circulating gas flash tank 2 for decompression flashing after heat exchange and cold recovery by related equipment. The H2S-rich methanol from the second circulating gas flash tank 2 is further decompressed and flashed in the fourth circulating gas flash tank 4 through the pressure reducing valve, and the gas phase and liquid phase after the decompression flashing enter the back system respectively.
[0013] The first connecting pipe 8 , the second connecting pipe 9 , the third connecting pipe 10 , and the fourth connecting pipe 11 are all provided with pressure reducing valves 7 .
[0014] Since CO2-rich methanol and H2S-rich methanol need to undergo two-stage vacuum flash evaporation to analyze the relevant components absorbed in the rich methanol, using a pressure reducing valve to reduce pressure will cause energy waste. This technology adds a hydraulic turbine generator set to the equipment and pipelines that need to be reduced pressure, uses liquid pressure drop to generate electricity, recovers energy, and reduces the overall comprehensive energy consumption in the coal-to-methanol process.
[0015] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A low-temperature methanol washing solution energy recovery device, comprising a first circulating gas flash tank (1), characterized in that: The first circulating gas flash tank (1) is connected to a first connecting pipe (8), the first circulating gas flash tank (1) is connected to a third circulating gas flash tank (3) via a third connecting pipe (10), the first connecting pipe (8) is connected to a first hydraulic turbine generator set (5), the first hydraulic turbine generator set (5) is connected to a second connecting pipe (9), the second connecting pipe (9) is connected to a second circulating gas flash tank (2), the second circulating gas flash tank (2) is connected to a fourth circulating gas flash tank (4) via a fourth connecting pipe (11), and the third connecting pipe (10) and the fourth connecting pipe (11) are connected via a second hydraulic turbine generator set (6).
2. A low-temperature methanol washing solution energy recovery device according to claim 1, characterized in that: The first connecting pipe (8), the second connecting pipe (9), the third connecting pipe (10) and the fourth connecting pipe (11) are all provided with pressure reducing valves (7).