Dry quenching cycle gas nitrogen supplement system

Abstract

The utility model discloses a dry quenching circulating gas nitrogen supplement system, it is including dry quenching furnace, deslagging unit, dust removal unit, nitrogen treatment unit, the outlet of nitrogen storage tank of nitrogen treatment unit is connected with the bottom gas inlet of dry quenching furnace through nitrogen supplement pipeline, and the top gas outlet of dry quenching furnace is connected with the inlet pipeline of primary dust remover of dust removal unit, nitrogen treatment unit includes air compressor, purification tower, liquefaction tower, separation tower, liquid oxygen storage tank, nitrogen storage tank, and the outlet of air compressor is connected with the inlet pipeline of purification tower, and the outlet of purification tower is connected with the inlet pipeline of separation tower, and the top gas outlet of separation tower is connected with the inlet pipeline of nitrogen storage tank, and the bottom liquid outlet of separation tower is connected with the inlet pipeline of liquid oxygen storage tank. Advantages: the nitrogen supplement of dry quenching circulating gas is replaced by supplementing air, and the coke burning loss rate can be effectively reduced, the coke output is increased, the carbon monoxide and carbon dioxide emission is reduced, and the carbon tax is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of coking, specifically relating to a nitrogen replenishment system for dry quenching coke circulating gas. Background Technology

[0002] With rising global temperatures and sea levels, coastal areas and island nations face an existential crisis, and carbon dioxide emission control has become a major factor affecting human survival. The global climate conference has heightened calls for carbon reduction and carbon neutrality, coupled with regional conflicts and significant downward pressure on the global economy. Furthermore, the sluggish domestic real estate market has led to a downturn in the coking industry, resulting in low overall profitability, with many coking plants operating at or near the brink of losses. Independent coking plants are struggling to survive. The increasing national emphasis on environmental protection and the setting of carbon peaking and carbon neutrality targets will require coking plants to continuously increase their investment in environmental protection and carbon emission control, further increasing their economic pressure. Energy conservation and emission reduction have become one of the main ways for coking plants to survive.

[0003] Traditional dry quenching equipment is a key measure for energy conservation and emission reduction in coking enterprises. However, traditional dry quenching equipment replenishes air, dilutes the carbon monoxide content in the circulating gas, and discharges waste gas. This waste gas contains high levels of carbon monoxide, carbon dioxide, and sulfur dioxide, increasing carbon emissions and air pollution for coking enterprises. Therefore, improving traditional dry quenching equipment to reduce waste gas emissions has become a top priority. Utility Model Content

[0004] The purpose of this invention is to provide a nitrogen replenishment system for dry quenching circulating gas.

[0005] This utility model is implemented by the following technical solution: a dry quenching coke circulating gas nitrogen replenishment system, which includes a dry quenching furnace, a slag discharge unit, a dust removal unit, and a nitrogen treatment unit; The outlet of the nitrogen storage tank of the nitrogen treatment unit is connected to the bottom air inlet of the dry quenching furnace through a nitrogen replenishment pipeline, and the top air outlet of the dry quenching furnace is connected to the inlet pipeline of the primary dust collector of the dust removal unit. The nitrogen treatment unit includes an air compressor, a purification tower, a liquefaction tower, a separation tower, a liquid oxygen storage tank, and a nitrogen storage tank. The outlet of the air compressor is connected to the inlet pipeline of the purification tower, the outlet of the purification tower is connected to the inlet pipeline of the separation tower, the top gas outlet of the separation tower is connected to the inlet pipeline of the nitrogen storage tank, and the bottom liquid outlet of the separation tower is connected to the inlet pipeline of the liquid oxygen storage tank.

[0006] Furthermore, the slag discharge unit includes a coke discharge valve and a coke conveyor. The coke discharge valve is located at the bottom outlet of the dry quenching furnace, and the coke conveyor is located below the coke discharge valve.

[0007] Furthermore, the dust removal unit includes a primary dust collector, a main economizer, a secondary dust collector, a circulating fan, a secondary economizer, and a circulating gas pipeline. The outlet of the primary dust collector is connected to the inlet pipeline of the main economizer, the outlet of the main economizer is connected to the inlet pipeline of the secondary dust collector, the outlet of the secondary dust collector is connected to the inlet pipeline of the secondary economizer via the circulating fan, and the outlet of the secondary economizer is connected to the bottom air inlet of the dry quenching furnace via the circulating gas pipeline. Furthermore, the top of the dry quenching furnace is equipped with an online nitrogen analyzer.

[0008] Furthermore, the nitrogen replenishment pipeline is equipped with a nitrogen regulating valve. The advantages of this invention are: using nitrogen to supplement the dry quenching coke circulating gas instead of supplementing air can effectively reduce the coke burn-off rate, increase coke production, reduce carbon monoxide and carbon dioxide emissions, and reduce carbon tax; supplementing nitrogen can reduce the circulating air volume, save power consumption of the blower, and is conducive to energy conservation and emission reduction in coking enterprises; it can reduce the coke grate temperature in the dry quenching furnace, extend the life of the coke conveyor belt, and improve the belt corridor environment; the process is simple, with low construction investment and low operating costs. 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 structure of the utility model; In the diagram: 1. Dry quenching furnace; 2. Primary dust collector; 3. Main economizer; 4. Secondary dust collector; 5. Circulating fan; 6. Secondary economizer; 7. Coke discharge valve; 8. Coke conveyor; 9. Nitrogen storage tank; 10. Liquid oxygen storage tank; 11. Separation tower; 12. Liquefaction tower; 13. Purification tower; 14. Air compressor; 15. Circulating gas pipeline; 16. Nitrogen replenishment pipeline; 17. Nitrogen regulating valve; 18. Online nitrogen analyzer. Detailed Implementation

[0011] 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.

[0012] like Figure 1 As shown, the dry quenching coke circulating gas nitrogen replenishment system includes a dry quenching furnace 1, a slag discharge unit, a dust removal unit, and a nitrogen treatment unit. The outlet of the nitrogen storage tank 9 of the nitrogen treatment unit is connected to the bottom air inlet of the dry quenching furnace 1 through the nitrogen replenishment pipeline 16, and the top air outlet of the dry quenching furnace 1 is connected to the inlet pipeline of the primary dust collector 2 of the dust removal unit. The nitrogen processing unit includes an air compressor 14, a purification tower 13, a liquefaction tower 12, a separation tower 11, a liquid oxygen storage tank 10, and a nitrogen storage tank 9. The outlet of the air compressor 14 is connected to the inlet pipeline of the purification tower 13, the outlet of the purification tower 13 is connected to the inlet pipeline of the separation tower 11, the top gas outlet of the separation tower 11 is connected to the inlet pipeline of the nitrogen storage tank 9, and the bottom liquid outlet of the separation tower 11 is connected to the inlet pipeline of the liquid oxygen storage tank 10. The purity of the produced nitrogen is ≥99.0%. The pressure of the produced nitrogen is ≥0.1 MPa. The flow rate of the produced nitrogen is adjustable, with an adjustment range of 100-20000 Nm³ / h.

[0013] The slag discharge unit includes a coke discharge valve 7 and a coke conveyor 8. The bottom outlet of the dry quenching furnace 1 is equipped with a coke discharge valve 7, and the coke conveyor 8 is located below the coke discharge valve 7.

[0014] The dust removal unit includes a primary dust collector 2, a main economizer 3, a secondary dust collector 4, a circulating fan 5, an auxiliary economizer 6, and a circulating gas pipeline 15. The outlet of the primary dust collector 2 is connected to the inlet pipeline of the main economizer 3, the outlet of the main economizer 3 is connected to the inlet pipeline of the secondary dust collector 4, the outlet of the secondary dust collector 4 is connected to the inlet pipeline of the auxiliary economizer 6 through the circulating fan 5, and the outlet of the auxiliary economizer 6 is connected to the bottom air inlet of the dry quenching furnace 1 through the circulating gas pipeline 15. The top of the dry quenching furnace 1 is equipped with an online nitrogen analyzer 18. This analyzer is used to detect the nitrogen content at the top of the dry quenching furnace 1 and transmit the nitrogen content signal to a display screen.

[0015] The nitrogen replenishment pipeline 16 is equipped with a nitrogen regulating valve 17. It receives the nitrogen content signal transmitted by the online gas (N2) detection device. When the nitrogen content of the dry quenching furnace 1 is ≤99%, the nitrogen regulating valve 17 is opened to replenish nitrogen to the dry quenching furnace 1.

[0016] Using nitrogen to supplement the dry quenching circulating gas instead of supplementing air can effectively reduce the coke burn-off rate, increase coke production, reduce carbon monoxide and carbon dioxide emissions, and reduce carbon tax. Supplementing nitrogen can reduce the circulating air volume, save power consumption of the blower, and is conducive to energy conservation and emission reduction in coking enterprises. It can also reduce the coke temperature of the first discharge section of the dry quenching furnace, extend the life of the coke conveyor belt, and improve the belt corridor environment. It has the advantages of simple process, low construction investment, and low operating cost.

[0017] The specific operation process of this embodiment is as follows: The nitrogen treatment unit compresses air through air compressor 14 and then sends it to purification tower 13 to remove impurities from the compressed air. The clean compressed air enters liquefaction tower 12 and is cooled to liquid state. The liquid air enters separation tower 11 to complete oxygen-nitrogen separation. The produced liquid oxygen and liquid nitrogen are sent to corresponding storage tanks for storage. The nitrogen storage tank 9 contains nitrogen with a purity of ≥99.0%. When the nitrogen content sent by nitrogen regulating valve 17 and nitrogen online analyzer 18 is ≤99%, nitrogen regulating valve 17 is opened, and nitrogen is added to the circulating gas at the bottom of dry quenching furnace 1 to exchange heat with the red-hot coke. It is then separated at the top and enters the primary dust collector 2 for dust removal. The circulating gas after dust removal enters the main economizer 3 for heat exchange, and the circulating gas after heat exchange enters the secondary dust collector 4 for dust removal. The circulating gas after dust removal is pressurized by the fan and enters the auxiliary economizer 6 for heat exchange. The coke discharge valve 7 is opened, and the coke falls onto the coke conveyor 8.

[0018] 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 dry quenching coke circulating gas nitrogen replenishment system, characterized in that, It includes a dry quenching furnace, a slag removal unit, a dust removal unit, and a nitrogen treatment unit; The outlet of the nitrogen storage tank of the nitrogen treatment unit is connected to the bottom air inlet of the dry quenching furnace through a nitrogen replenishment pipeline, and the top air outlet of the dry quenching furnace is connected to the inlet pipeline of the primary dust collector of the dust removal unit. The nitrogen treatment unit includes an air compressor, a purification tower, a liquefaction tower, a separation tower, a liquid oxygen storage tank, and a nitrogen storage tank. The outlet of the air compressor is connected to the inlet pipeline of the purification tower, the outlet of the purification tower is connected to the inlet pipeline of the separation tower, the top gas outlet of the separation tower is connected to the inlet pipeline of the nitrogen storage tank, and the bottom liquid outlet of the separation tower is connected to the inlet pipeline of the liquid oxygen storage tank.

2. The dry quenching recirculating gas nitrogen replenishment system according to claim 1, characterized in that, The slag discharge unit includes a coke discharge valve and a coke conveyor. The coke discharge valve is located at the bottom outlet of the dry quenching furnace, and the coke conveyor is located below the coke discharge valve.

3. The dry quenching coke circulating gas nitrogen replenishment system according to claim 2, characterized in that, The dust removal unit includes a primary dust collector, a main economizer, a secondary dust collector, a circulating fan, an auxiliary economizer, and a circulating gas pipeline. The outlet of the primary dust collector is connected to the inlet pipeline of the main economizer, the outlet of the main economizer is connected to the inlet pipeline of the secondary dust collector, the outlet of the secondary dust collector is connected to the inlet pipeline of the auxiliary economizer via the circulating fan, and the outlet of the auxiliary economizer is connected to the bottom air inlet of the dry quenching furnace via the circulating gas pipeline.

4. The dry quenching coke circulating gas nitrogen replenishment system according to claim 3, characterized in that, The top of the dry quenching furnace is equipped with an online nitrogen analyzer.

5. The dry quenching coke circulating gas nitrogen replenishment system according to claim 4, characterized in that, The nitrogen replenishment pipeline is equipped with a nitrogen regulating valve.

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