A purge gas reuse system
By using a purge gas recycling system, the desorbed gas is compressed and reused in the coke oven gas pipeline, which solves the problem of resource waste in coking plants and improves the utilization rate of coke oven gas.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- INNER MONGOLIA DONGRI NEW ENERGY MATERIALS CO LTD
- Filing Date
- 2025-08-13
- Publication Date
- 2026-06-30
AI Technical Summary
In the current coking plants, combustion is often used to process the desorbed gas from coke ovens, which leads to resource waste and fails to effectively utilize the hydrogen resources in the desorbed gas.
Design a purge gas recycling system that uses a hydrogen extraction device, a flare tower, an air compressor, a high-pressure gas tank, and a gas pump to compress the purge gas and reuse it in the coke oven return gas pipeline, thereby achieving stable transportation and co-firing of the tail gas.
This enables low-cost reuse of desorbed gas, avoids resource waste, and improves the utilization rate of coke oven gas.
Smart Images
Figure CN224430525U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of purge gas reuse, specifically to a purge gas reuse system. Background Technology
[0002] In the coke oven gas to methanol project, the off-gas, as the production waste gas of the methanol unit, contains more than 70% hydrogen gas and can be used as a feed gas for hydrogen purification. In order to improve the utilization rate of coke oven gas, hydrogen is extracted using a methanol off-gas hydrogen extraction unit. The excess tail gas produced is desorbed gas, which also contains impurities, including carbon dioxide and nitrogen. It is usually further purified by catalytic oxidation, activated carbon adsorption or combustion to ensure that it meets emission standards before being discharged.
[0003] To reduce input costs, most coking plants currently use combustion methods, which leads to a waste of desorption gas. A solution needs to be designed to utilize the desorption gas at a low cost. Utility Model Content
[0004] The purpose of this invention is to provide a purge gas recycling system.
[0005] This utility model is implemented by the following technical solution:
[0006] A purge gas reuse system includes a hydrogen extraction device, a flare tower, an air compressor, a high-pressure gas tank, a gas pump, and a coke oven gas return pipeline. The tail gas outlet of the hydrogen extraction device is connected to the inlet of the flare tower via a pipeline. A first shut-off valve is installed on the pipeline. The pipeline between the first shut-off valve and the hydrogen extraction device is connected to the inlet of the air compressor via a second shut-off valve. The outlet of the air compressor is connected to the inlet of the high-pressure gas tank. The outlet of the high-pressure gas tank is connected to the inlet of the gas pump. The outlet of the gas pump is connected to the coke oven gas return pipeline.
[0007] Preferably, the end of the coke oven return gas pipeline is connected to the coke oven regenerator.
[0008] The advantages of this invention are: after the purge gas is hydrogenated, the resulting tail gas is compressed and stabilized, and then incorporated into the loop gas and re-entered into the coking furnace for coking, saving some of the recycled gas, avoiding waste, and treating the tail gas at low cost. Attached Figure Description
[0009] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0010] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0011] In the diagram: 1. Hydrogen extraction unit; 2. Flare tower; 3. Air compressor; 4. High-pressure gas tank; 5. Gas pump; 6. Coke oven return gas pipeline; 7. Pipeline; 8. First shut-off valve; 9. Second shut-off valve; 10. Coke oven regenerator. Detailed Implementation
[0012] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0013] like Figure 1 As shown, a purge gas reuse system includes a hydrogen extraction device 1, a flare tower 2, an air compressor 3, a high-pressure gas tank 4, a gas pump 5, and a coke oven return gas pipeline 6. The tail gas outlet of the hydrogen extraction device 1 is connected to the inlet of the flare tower 2 via a pipeline 7. A first shut-off valve 8 is provided on the pipeline 7. The pipeline 7 between the first shut-off valve 8 and the hydrogen extraction device 1 is connected to the inlet of the air compressor 3 via a second shut-off valve 9. The outlet of the air compressor 3 is connected to the inlet of the high-pressure gas tank 4. The outlet of the high-pressure gas tank 4 is connected to the inlet of the gas pump 5. The outlet of the gas pump 5 is connected to the coke oven return gas pipeline 6. The end of the coke oven return gas pipeline 6 is connected to the coke oven regenerator 10.
[0014] Working principle: When this utility model is in use, the exhaust gas discharged from the hydrogen extraction device 1, also called the desorption gas, can be burned in the flare tower 2 by opening the first shut-off valve 8 and closing the second shut-off valve 9. This is the existing technology. Alternatively, the exhaust gas is compressed by the air compressor 3 and stored in the high-pressure gas tank 4. Then, it is stably output to the coke oven return gas pipeline 6 by the air pump 5, where it is mixed with the return gas and burned in the coke oven regenerator 10. This reuses the exhaust gas and prevents waste.
[0015] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A purge gas reuse system, characterized in that, The system includes a hydrogen extraction unit, a flare tower, an air compressor, a high-pressure gas tank, a gas pump, and a coke oven gas pipeline. The tail gas outlet of the hydrogen extraction unit is connected to the inlet of the flare tower via a pipeline. A first shut-off valve is installed on the pipeline. The pipeline between the first shut-off valve and the hydrogen extraction unit is connected to the inlet of the air compressor via a second shut-off valve. The outlet of the air compressor is connected to the inlet of the high-pressure gas tank. The outlet of the high-pressure gas tank is connected to the inlet of the gas pump. The outlet of the gas pump is connected to the coke oven gas pipeline.
2. The purge gas reuse system according to claim 1, characterized in that: The end of the coke oven return gas pipeline is connected to the coke oven regenerator.