Coke oven gas comprehensive utilization system for steel coke combined enterprise

Abstract

The utility model discloses a coke oven gas comprehensive utilization system for a steel coke combined enterprise. The coke oven gas comprehensive utilization system comprises a coke oven system, a gas preliminary purification system and a natural gas production system, a raw gas outlet of the coke oven system is communicated with the gas primary purification system through a raw gas output pipeline; a coke oven gas outlet of the gas primary purification system is communicated with a natural gas production system through a coke oven gas pipeline, is communicated with a steel mill coke oven gas delivery pipeline through a coke oven gas delivery pipeline and is communicated with a mixed gas pipeline through a coke oven gas recycling pipeline; a hydrogen-rich tail gas outlet of the natural gas production system is communicated with a mixed gas pipeline through a hydrogen-rich tail gas recycling pipeline, is communicated with a blowing system of a steelmaking blast furnace through a hydrogen-rich tail gas pipeline, and is communicated with a steel mill coke oven gas delivery pipeline through a hydrogen-rich tail gas delivery pipeline; and nitrogen-rich gas of the natural gas production system is communicated with a blast furnace gas pipe network through a nitrogen-rich gas pipeline. According to the system, no redundant gas is generated, so that all media are reasonably utilized.

Description

Technical Field

[0001] The utility model relates to the technical field of comprehensive utilization of coke oven gas, in particular to a comprehensive utilization system of coke oven gas in an integrated steel and coke enterprise. Background Technique

[0002] As a coking plant in an integrated steel and coke enterprise, the main products are coke, chemical products and coke oven gas. How to reasonably utilize coke oven gas is a major problem in the development of coking plants. Generally, coke is transported to ironmaking or sold directly to the outside, chemical products are sold directly or deep-processed, and gas is directly transported to subsequent users or deep-processed. For coke oven gas, how to achieve the comprehensive utilization of coke oven gas is a problem that plagues the development of coking plants in integrated steel and coke enterprises, and this problem needs to be further explored for coking plants.

[0003] The raw coke oven gas coming out of the coke oven undergoes primary purification in the primary gas purification system of the coke oven gas. Part of it enters the natural gas production unit to produce liquefied natural gas. Part of the hydrogen-rich tail gas, which is a by-product of the natural gas unit, goes to the coke oven as fuel gas for combustion, part is incorporated into the coke oven gas pipeline network as fuel for subsequent users, and another part is sent to the steelmaking blast furnace as blast injection gas (as the hydrogen source for hydrogen metallurgy). The rich nitrogen gas is incorporated into the blast furnace gas pipeline network; another part of the coke oven gas returns to the coke oven as fuel gas. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a comprehensive utilization system of coke oven gas in an integrated steel and coke enterprise to achieve the reasonable utilization of each product including by-products.

[0005] To solve the above technical problems, the technical solution adopted by the utility model is: it includes a coke oven system, a primary gas purification system and a natural gas production system; the raw coke oven gas outlet of the coke oven system is connected to the primary gas purification system through a raw coke oven gas output pipeline, and the coke oven gas outlet of the primary gas purification system is connected to the natural gas production system through a coke oven gas pipeline, connected to the steel plant's external coke oven gas pipeline through a coke oven gas external delivery pipeline, and connected to the blending coal gas pipeline through a coke oven gas recycling pipeline; the hydrogen-rich tail gas outlet of the natural gas production system is connected to the blending coal gas pipeline through a hydrogen-rich tail gas recycling pipeline, connected to the blast injection system of the steelmaking blast furnace through a hydrogen-rich tail gas pipeline, and connected to the steel plant's external coke oven gas pipeline through a hydrogen-rich tail gas external delivery pipeline; the rich nitrogen gas of the natural gas production system is connected to the blast furnace gas pipeline network through a rich nitrogen gas pipeline; the blending coal gas pipeline is connected to the fuel inlet of the coke oven system.

[0006] Further, the primary gas purification system includes a primary cooler, an electrostatic tar precipitator, a gas blower, a desulfurization tower, a saturated ammonium sulfate saturator and a benzene scrubber connected in sequence.

[0007] Further, the natural gas production system includes a raw gas compressor, a crude desulfurization tower for oil and naphthalene removal, a syngas compressor, an oil filter tank, a pre-hydrogenation and primary-secondary hydrogenation converter, a first, second, and third reactor, a deammoniation, demercuration, and dehydration tower, a refrigerant compressor cold box, and a liquefied natural gas storage tank, which are connected in sequence.

[0008] Furthermore, the outlets of the raw gas compressor and the syngas compressor in the natural gas production system are also connected to the hydrogen-rich tail gas pipeline through a pressurized coke oven gas external delivery pipeline.

[0009] The beneficial effects of adopting the above technical solution are as follows: Starting from the raw coke oven gas generated by the coke oven until the production of products and their subsequent use by users, including the by-products generated, are all reasonably utilized. No excess gas is generated in the entire system, enabling all media to be reasonably utilized. Description of the Drawings

[0010] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0011] Figure 1 It is a schematic diagram of the system structure of the present invention.

[0012] In the figure: Coke oven system 1, Coal gas preliminary purification system 2, Natural gas production system 3, Coke oven gas external delivery pipeline 4, Coke oven gas pipeline 5, Coke oven gas recycling pipeline 6, Hydrogen-rich tail gas recycling pipeline 7, Blended coal gas pipeline 8, Pressurized coke oven gas external delivery pipeline 9, Hydrogen-rich tail gas pipeline 10, Hydrogen-rich tail gas external delivery pipeline 11, Nitrogen-rich gas pipeline 12. Specific Embodiments

[0013] Figure 1 As shown, the coke oven gas comprehensive utilization system of the integrated coke oven and steel enterprise of Benxi Steel includes a coke oven system 1, a coal gas preliminary purification system 2, and a natural gas production system 3. The raw coke oven gas outlet of the coke oven system 1 is connected to the coal gas preliminary purification system 2 through a raw coke oven gas output pipeline. The coke oven gas outlet of the coal gas preliminary purification system 2 is connected to the natural gas production system 3 through a coke oven gas pipeline 5, connected to the external delivery coke oven gas pipeline of the steel mill through a coke oven gas external delivery pipeline 4, and connected to the blended coal gas pipeline 8 through a coke oven gas recycling pipeline 6. The hydrogen-rich tail gas outlet of the natural gas production system 3 is connected to the blended coal gas pipeline 8 through a hydrogen-rich tail gas recycling pipeline 7, connected to the injection system of the steelmaking blast furnace through a hydrogen-rich tail gas pipeline 10, and connected to the external delivery coke oven gas pipeline of the steel mill through a hydrogen-rich tail gas external delivery pipeline 11. The nitrogen-rich gas of the natural gas production system 3 is connected to the blast furnace coal gas network through a nitrogen-rich gas pipeline 12. The blended coal gas pipeline 8 is connected to the fuel inlet of the coke oven system 1.

[0014] Figure 1As shown in the figure, the gas preliminary purification system 2 of the coke oven gas comprehensive utilization system of the Benxi coking and iron-making integrated enterprise includes a primary cooler, an electrostatic tar precipitator, a gas blower, a desulfurization tower, a saturated ammonium sulfate saturator, and a benzene scrubber, which are connected in sequence.

[0015] Figure 1 As shown in the figure, the natural gas production system 3 of the coke oven gas comprehensive utilization system of the Benxi coking and iron-making integrated enterprise includes a raw gas compressor, a crude desulfurization tower for removing oil and naphthalene, a syngas compressor, an oil filter tank, a pre-hydrogenation and two-stage hydrogenation converter, a first, second, and third stage reactor, a deammoniation, demercuration, and dehydration tower, a refrigerant compressor cold box, and a liquefied natural gas storage tank. The outlets of the raw gas compressor and the syngas compressor in the natural gas production system 3 are also connected to the hydrogen-rich tail gas pipeline 10 through the pressurized coke oven gas external transmission pipeline 9.

[0016] After adopting the above structure, the production process of the coke oven gas comprehensive utilization system of the Benxi coking and iron-making integrated enterprise is as follows:

[0017] a. The raw coke oven gas is produced by the coke oven system 1;

[0018] b. The raw coke oven gas enters the gas preliminary purification system 2 for preliminary purification, so that the pressure of the coke oven gas meets the requirements for external transmission to subsequent users;

[0019] c. Part of the coke oven gas output by the gas preliminary purification system 2 is sent back to the coke oven of the coke oven system 1 for combustion heating through the coke oven gas recycling pipeline 6 and the blending coal gas pipeline 8;

[0020] d. Another part of the coke oven gas output by the gas preliminary purification system 2 is externally transmitted to other users in the steel mill through the coke oven gas external transmission pipeline 4;

[0021] e. The coke oven gas output by the gas preliminary purification system 2 is mainly sent to the natural gas production system 3 through the coke oven gas pipeline 5 for the production of liquefied natural gas;

[0022] f. Part of the hydrogen-rich tail gas generated by the natural gas production system 3 is mixed with the coke oven gas transported by the coke oven gas recycling pipeline 6 in step c through the hydrogen-rich tail gas recycling pipeline 7, and is sent to the coke oven of the coke oven system 1 for combustion use through the blending coal gas pipeline 8;

[0023] g. Another part of the hydrogen-rich tail gas generated by the natural gas production system 3 is externally transmitted to other users in the steel mill in combination with the coke oven gas transported by the coke oven gas external transmission pipeline 4 in step d through the hydrogen-rich tail gas external transmission pipeline 11;

[0024] h. The hydrogen-rich tail gas generated by the natural gas production system 3 is mainly externally transmitted for injection into the blast furnace for steelmaking through the hydrogen-rich tail gas pipeline 10;

[0025] i. During the shutdown and maintenance of the natural gas production system 3, one set of raw gas compressors and one set of syngas compressors are operated alone. After pressurizing the coke oven gas, it is merged into the hydrogen-rich tail gas pipeline 10 through the pressurized coke oven gas external delivery pipeline 9 and sent out.

[0026] j. The nitrogen-rich gas generated by the natural gas production system 3 is externally merged into the blast furnace gas pipeline network through the nitrogen-rich gas pipeline 12.

Claims

1. A coke oven gas comprehensive utilization system for a steel and coke joint enterprise, characterized by: The invention comprises a coke oven system (1), a coal gas preliminary purification system (2) and a natural gas production system (3); the raw coal gas outlet of the coke oven system (1) is connected to the coal gas preliminary purification system (2) via a raw coal gas output pipeline, the coke oven gas outlet of the coal gas preliminary purification system (2) is connected to the natural gas production system (3) via a coke oven gas pipeline (5), connected to the steel plant's external coke oven gas pipeline via a coke oven gas external transmission pipeline (4), and connected to the mixed coal gas pipeline via a coke oven gas recycling pipeline (6). (8); the hydrogen-rich tail gas outlet of the natural gas production system (3) is connected to the blending gas pipeline (8) through the hydrogen-rich tail gas recycling pipeline (7), connected to the injection system of the steelmaking blast furnace through the hydrogen-rich tail gas pipeline (10), and connected to the steel plant's external coke oven gas pipeline through the hydrogen-rich tail gas external pipeline (11); the nitrogen-rich gas of the natural gas production system (3) is connected to the blast furnace gas network through the nitrogen-rich gas pipeline (12); the blending gas pipeline (8) is connected to the fuel inlet of the coke oven system (1).

2. A coke oven gas comprehensive utilization system for a steel and coke joint enterprise according to claim 1, characterized in that: The coal gas preliminary purification system (2) comprises a primary cooler, an electric tar collector, a coal gas blower, a desulfurization tower, an ammonium sulfate saturator and a benzene washing tower which are connected in sequence.

3. A coke oven gas comprehensive utilization system for a steel-coke joint enterprise according to claim 1 or 2, characterized in that: The natural gas production system (3) comprises a raw gas compressor, a de-oiling and de-naphthalene crude desulfurization tower, a synthesis gas compressor, an oil filter tank, a pre-hydrogenation first and second stage hydroconverter, a first, second and third stage reactor, a de-amination and de-mercuration dehydration tower, a refrigerant compressor cold box and a liquefied natural gas storage tank, which are connected in sequence.

4. The coke oven gas comprehensive utilization system of a steel-coke joint enterprise according to claim 3, characterized in that: The outlets of the raw gas compressor and the synthesis gas compressor in the natural gas production system (3) are also connected to the hydrogen-rich tail gas pipeline (10) via a pressurized coke oven gas delivery pipeline (9).

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