CN210885939U

CN210885939U - Dry quenching circulating gas processing device

Info

Publication number: CN210885939U
Application number: CN201921982508.0U
Authority: CN
Inventors: 陈凌; 贾艳艳; 欧阳平
Original assignee: Chongqing Technology and Business University
Current assignee: Chongqing Technology and Business University
Priority date: 2019-11-18
Filing date: 2019-11-18
Publication date: 2020-06-30
Anticipated expiration: 2029-11-18

Abstract

The utility model discloses a dry quenching circulating gas processing apparatus, including hot cyclone (1), exhaust-heat boiler (2), dry process sack cleaner (3), heat pipe exchanger (4), vacuum pressure swing adsorption decarbonization equipment (5), be equipped with buffer tank (6) of nitrogen gas input pipeline (7), its characterized in that: the hot cyclone dust collector (1) is connected with the top of the dry quenching furnace through a circulating gas pipeline, and then is connected with the waste heat boiler (2), the dry bag dust collector (3), the heat pipe exchanger (4), the vacuum pressure swing adsorption decarburization equipment (5) and the buffer tank (6) through the circulating gas pipeline in sequence, and the buffer tank (6) is connected with the bottom of the dry quenching furnace through the circulating gas pipeline. The device can effectively reduce CO in the dry quenching circulating gas₂Resulting in coke loss and sufficient recovery of heat from the recycle gasAnd coke powder brought out from the circulating gas, thereby effectively reducing the coke cost and having obvious technical and economic advantages.

Description

Dry quenching circulating gas processing device

Technical Field

The utility model belongs to the technical field of coking industry dry quenching technology, and relates to a device for dry quenching circulating gas treatment technology.

Background

The dry quenching adopts inert gas nitrogen to cool the red coke, and simultaneously recovers the high-temperature sensible heat of the red coke, so that the dry quenching has obvious advantages in the aspects of energy saving, water saving, coke quality improvement and the like compared with wet quenching, and is always a key technology for the research and popularization of the coking industry in China.

For the dry quenching process, a small amount of air and O in the air can leak into the negative pressure section of the gas circulation system₂In the red coke layer, the coke reacts to generate CO₂，CO₂Can be reduced into CO again in a high-temperature area of a coke layer; while H in air₂O will react with coke to form H₂And CO; in addition, residual volatile components in the coke are always separated out, and H is generated by the pyrolysis of the coke₂And CO, etc. The above process is always present in the coke dry quenching production, resulting in H in the coke dry quenching cycle gas₂、CO、CO₂When the components are accumulated continuously, when H₂And when the CO exceeds a certain proportion, explosion accidents are easily caused. Therefore, in practical operation, it is necessary to continuously replenish industrial N₂Or introducing proper amount of air to ignite combustible components in the circulating gas and the like to reduce H₂The proportion of CO is below the explosion limit, and the surplus part of the circulating gas is discharged according to the process requirement.

Generally speaking, N in the dry quenching cycle gas₂、CO₂、CO、H₂The proportions are as follows: n is a radical of₂Is more than or equal to 66 percent; CO 2₂8 to 12 percent; CO is 6 to 8 percent; h ₂2 to 4 percent. CO is not treated in the prior dry quenching circulating gas treatment₂Treating to recycle CO in the gas₂The coke layer high-temperature area can react with coke to produce CO, so that the coke loss is caused; meanwhile, in the conventional dry quenching circulating gas treatment, a primary hot cyclone dust removal mode, an exhaust-heat boiler mode and a secondary hot cyclone dust removal mode are adopted, the circulating gas after the heat is recovered by the exhaust-heat boiler is 180 ℃, and the heat and dust (the main component is coke powder) of the circulating gas are not sufficiently recovered.

Based on the above situation, how to ensure H in the dry quenching circulating gas₂And on the basis that CO is lower than the explosion limit, the coke loss is reduced as much as possible, and the heat of the circulating gas is fully recovered, which is the key point and the difficulty of the dry quenching circulating gas treatment at present.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: aiming at the CO in the prior dry quenching circulating gas₂Resulting coke loss, and recycleThe problems of insufficient recovery of gas heat and dust (the main component is coke powder), and the like, provides a coke dry quenching circulating gas treatment device which can effectively reduce CO in the circulating gas₂Resulting in loss of coke and sufficient recovery of heat and dust (mainly coke powder) from the recycle gas.

In order to achieve the purpose, the following technical scheme is adopted.

The utility model provides a dry coke quenching circulating gas processing apparatus, includes hot cyclone (1), exhaust-heat boiler (2), dry process sack cleaner (3), heat pipe exchanger (4), vacuum pressure swing adsorption decarbonization equipment (5), buffer tank (6) that are equipped with nitrogen gas input pipeline (7), its characterized in that: the hot cyclone dust collector (1) is connected with the top of the dry quenching furnace through a circulating gas pipeline, and then is connected with the waste heat boiler (2), the dry bag dust collector (3), the heat pipe exchanger (4), the vacuum pressure swing adsorption decarburization equipment (5) and the buffer tank (6) through the circulating gas pipeline in sequence, and the buffer tank (6) is connected with the bottom of the dry quenching furnace through the circulating gas pipeline.

Furthermore, the temperature of the circulating gas at the outlet of the waste heat boiler (2) is 150-180 ℃.

Furthermore, the temperature of the circulating gas at the outlet of the heat pipe heat exchanger (4) is 40 ℃.

Furthermore, the temperature of the circulating gas at the outlet of the vacuum pressure swing adsorption decarbonization device (5) is 40 ℃.

Furthermore, the buffer tank (6) is provided with a nitrogen input pipeline (7), and the circulating gas entering the buffer tank (6) from the vacuum pressure swing adsorption decarbonization device (5) and the supplementary nitrogen entering the buffer tank (6) through the nitrogen input pipeline (7) are uniformly mixed in the buffer tank (6) and then enter the bottom of the dry quenching furnace through the circulating gas pipeline.

Furthermore, the temperature of the supplementary nitrogen entering the buffer tank (6) through the nitrogen input pipeline (7) is 25-40 ℃.

The beneficial effects of the utility model include following several.

1) The device adopts the vacuum pressure swing adsorption decarbonization equipment to carry out CO on the circulating gas entering the dry quenching furnace₂Removal treatment to greatly reduce dry quenchingCO in the circulating gas of the furnace₂Content, reduction of CO in the process of dry quenching₂The reaction with coke can effectively reduce the loss of coke and simultaneously effectively slow down the accumulation of CO in the circulating gas.

2) The device adopts the vacuum pressure swing adsorption decarbonization equipment to carry out CO on the circulating gas entering the dry quenching furnace₂Removing, and supplementing the stripping gas (CO) in buffer tank by nitrogen supplement₂Mainly contains very little CO and H₂Etc.) to reduce CO, H in the recycle gas₂The ratio of (a) to (b). In the specific production, when CO and H₂When the accumulation is more, the technological parameters of the vacuum pressure swing adsorption decarbonization equipment can be changed, and CO and H in the decarbonization gas can be reduced₂The yield of (2) is increased, and CO and H in the externally discharged decomposed gas are increased₂Content of CO and H in the circulating gas obtained by mixing the decarbonized gas with the supplementary nitrogen in the buffer tank₂Is below the explosive limit. The method is adopted to carry out CO and H₂The content is adjusted without arranging an additional diffusion or ignition process, and the discharged desorption gas is CO₂Mainly, the subsequent treatment can be carried out to form CO₂The product gas is supplied externally, and the CO and H are reduced compared with the traditional dry quenching circulating gas₂The advantages are obvious in content method.

3) The device adopts the dry cloth bag dust remover to perform fine dust removal on the circulating gas after the process of the waste heat boiler, and can fully recover the coke powder in the dust contained in the circulating gas; and simultaneously, the utility model discloses the device is equipped with heat pipe exchanger in dry process sack cleaner process and carries out gaseous low temperature section heat recovery, produces low temperature steam or production, domestic hot water. The utility model discloses the device has fully retrieved the coke breeze of taking over among the circulating gas (can be used to the blending coking or blast furnace jetting) and circulating gas's heat, can reduce the coke cost effectively, compares traditional dry coke quenching circulating gas and handles, and the advantage is comparatively obvious. In addition, compared with the traditional hot cyclone dust removal, the dry bag-type dust remover is adopted for fine dust removal of the circulating gas, so that the dust content of the circulating gas is greatly reduced, the blockage of a circulating gas pipeline subsequently entering a dry quenching furnace can be effectively avoided, and the stable operation of the dry quenching production is ensured.

Drawings

Fig. 1 is a schematic view of the device of the present invention. The method comprises the following steps: the system comprises a hot cyclone dust collector (1), a waste heat boiler (2), a dry bag dust collector (3), a heat pipe exchanger (4), vacuum pressure swing adsorption decarbonization equipment (5) and a buffer tank (6) provided with a nitrogen input pipeline (7).

Detailed Description

The invention is further described with reference to the accompanying drawings and specific embodiments.

As shown in the drawing, a dry quenching cycle gas processing device includes: the system comprises a hot cyclone dust collector (1), a waste heat boiler (2), a dry bag dust collector (3), a heat pipe exchanger (4), vacuum pressure swing adsorption decarbonization equipment (5) and a buffer tank (6) provided with a nitrogen input pipeline (7).

After coarse dust removal is carried out on dry quenching circulating gas (900-1000 ℃) discharged from the top of the dry quenching furnace through a hot cyclone dust collector (1), the dry quenching circulating gas enters a waste heat boiler (2) for recycling heat of the circulating gas, medium-pressure steam and low-pressure steam are produced, and meanwhile, the temperature of the circulating gas is reduced to 150-180 ℃; after the heat is recovered by the waste heat boiler (2), the dry quenching circulating gas is subjected to fine dust removal by a dry cloth bag dust remover (3), and then enters a heat pipe exchanger (4) to recover the heat of the circulating gas at a low temperature section, so as to produce low-temperature steam or hot water for production and living, and simultaneously reduce the temperature of the circulating gas to 40 ℃; the dry quenching circulating gas after the heat is recovered by the heat pipe exchanger (4) enters a vacuum pressure swing adsorption decarbonization device (5) for CO₂Removal of CO, removal of CO₂The recycled gas (namely decarbonization gas, 40 ℃) enters a buffer tank (6) through a recycled gas pipeline, and the gas is analyzed (by CO)₂Predominantly) as CO₂Externally supplying product raw material gas; removing CO by vacuum pressure swing adsorption decarbonization equipment (5)₂And the dry quenching circulating gas enters a buffer tank (6) through a circulating gas pipeline, is uniformly mixed with supplementary nitrogen which enters the buffer tank (6) through a nitrogen input pipeline (7) in the buffer tank (6), and then enters the bottom of the dry quenching furnace through the circulating gas pipeline, wherein the temperature of the supplementary nitrogen which enters the buffer tank (6) through the nitrogen input pipeline (7) is 25-40 ℃.

The utility model can effectively reduce CO in the dry quenching circulating gas₂The coke loss that leads to has fully retrieved the coke powder that the heat of circulating gas and brought out in the circulating gas simultaneously, can reduce the coke cost effectively, and can avoid the jam of the circulating gas pipeline of dry quenching bottom effectively, guarantee the steady operation of dry quenching production, technical, economic advantage are obvious.

Claims

1. The utility model provides a dry coke quenching circulating gas processing apparatus, includes hot cyclone (1), exhaust-heat boiler (2), dry process sack cleaner (3), heat pipe exchanger (4), vacuum pressure swing adsorption decarbonization equipment (5), buffer tank (6) that are equipped with nitrogen gas input pipeline (7), its characterized in that: the hot cyclone dust collector (1) is connected with the top of the dry quenching furnace through a circulating gas pipeline, and then is connected with the waste heat boiler (2), the dry bag dust collector (3), the heat pipe exchanger (4), the vacuum pressure swing adsorption decarburization equipment (5) and the buffer tank (6) through the circulating gas pipeline in sequence, and the buffer tank (6) is connected with the bottom of the dry quenching furnace through the circulating gas pipeline.

2. The dry quenching circulating gas processing device as claimed in claim 1, wherein: the temperature of the circulating gas at the outlet of the waste heat boiler (2) is 150-180 ℃.

3. The dry quenching circulating gas processing device as claimed in claim 1, wherein: the temperature of the circulating gas at the outlet of the heat pipe heat exchanger (4) is 40 ℃.

4. The dry quenching circulating gas processing device as claimed in claim 1, wherein: the temperature of the circulating gas at the outlet of the vacuum pressure swing adsorption decarbonization device (5) is 40 ℃.

5. The dry quenching circulating gas processing device as claimed in claim 1, wherein: the buffer tank (6) is provided with a nitrogen input pipeline (7), and the circulating gas entering the buffer tank (6) from the vacuum pressure swing adsorption decarbonization device (5) and the supplementary nitrogen entering the buffer tank (6) through the nitrogen input pipeline (7) are uniformly mixed in the buffer tank (6) and then enter the bottom of the dry quenching furnace through the circulating gas pipeline.

6. The dry quenching circulating gas processing device as claimed in claim 5, wherein: the temperature of the supplementary nitrogen entering the buffer tank (6) through the nitrogen input pipeline (7) is 25-40 ℃.