CN111040787A

CN111040787A - Wet coke quenching device system

Info

Publication number: CN111040787A
Application number: CN202010016023.7A
Authority: CN
Inventors: 张涛; 姬庆庆
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-01-08
Filing date: 2020-01-08
Publication date: 2020-04-21

Abstract

The invention discloses a wet quenching device system which comprises a waste gas treatment module, a spraying module, a nozzle cleaning module, a water circulation module and the like, wherein the waste gas treatment module, the spraying module, the nozzle cleaning module and the water circulation module are arranged at a sewage outlet below a flue and form a quenching system together with the flue. Along with the coke quenching process, a large amount of condensed wastewater generated at the bottom of the tower is collected in the primary wastewater tank and the primary wastewater tank, and the wastewater is subjected to precipitation removal to reduce the content of solid substances. Then lifted to a secondary wastewater tank by a wastewater lifting pipe and a wastewater lifting pipe. Purified water finally enters the purified water tank for storage after being purified by a purification membrane arranged between the secondary wastewater tank and the purified water tank. The invention introduces an infrared temperature measuring device to monitor the temperature in the coke quenching process, thereby ensuring the coke quality. All modules and mechanisms are matched; the integral system can ensure the environmental protection and high efficiency of the coke quenching process while realizing high-quality coke quenching.

Description

Wet coke quenching device system

Technical Field

The invention relates to a wet quenching device system, which is mainly used for a coke quenching link of coke smelting and the like, and belongs to the technical field of coke smelting.

Background

In China, the steel industry always belongs to an important industry in industrial development in China, and a large amount of energy is consumed and a large amount of pollutants are generated in the steel refining process. In the iron and steel industry, the coking process is an important component link, and coke plays many roles of providing heat source, reducing agent, framework material and the like in the blast furnace ironmaking process. With the continuous development of the steel industry in China, the continuous improvement of the productivity of the coke industry in China is also driven.

In the coke refining process, the proportioned coal is carbonized in a high-temperature carbonization chamber to prepare coke, and then the carbonized coke is refined. Then the carbonized high-temperature coke needs to be sent into a coke transport vehicle. In the coking process, the high-temperature coke produced by the coke oven is contacted with air to obtain rich oxygen to be violently combusted. Therefore, the temperature of the high-temperature coke needs to be reduced from more than 1000 ℃ to less than 200 ℃ in a short time, and the process of reducing the temperature of the coke is coke quenching. After the coke, the coke plant will perform another screening, and then sell the coke as a commodity according to the screening result, or serve as a raw material for other process flows.

In a coking plant in the current process, the coke quenching process is the production link with the most serious pollution and the most energy consumption in the coking industry, and meanwhile, in the coke production process, the recycling of energy also has a plurality of problems. The main reason for the above problems is that the energy released during the coke cooling process needs to be reflected in another form according to the heat balance principle, and under the existing technical conditions, the coking industry often absorbs the energy generated during the coke production process by water and inert gas, and the two main flow ways correspond to the wet quenching technology and the dry quenching technology which are commonly used in the coking plant at the present stage. The wet quenching technology has the advantages of simple equipment and high coke quenching speed, but because water can be changed into water vapor in a high-temperature environment, the water vapor generated in the method containsA large amount of toxic and harmful substances, e.g. coke breeze particles, H₂S, CO, etc. Since the steam formed is recycled by condensation, a large amount of heat energy is lost by performing the heat transfer twice. Moreover, most coking plants are built in water-deficient areas, consume a large amount of water, and further aggravate the shortage of water resources. The moisture contained in the coke also increases the energy consumption of the coke during iron making. On the other hand, a large amount of heat energy is stored in the high-temperature coke, almost half of the heat energy for coking is consumed in the gasification of coke quenching water, and a large amount of water is evaporated by coke quenching, so that a large amount of energy and water resources are wasted. In recent years, the coke dry quenching technology for generating electricity by cooling red coke with nitrogen is also applied to the coking industry more and more, and plays an active role in recovering energy and reducing pollutant emission. However, the problems of high equipment investment and operation cost, high maintenance cost and the like of the dry quenching method are not solved all the time, heavy cost burden is brought to the operation of enterprises, and the wide popularization of the dry quenching technology is seriously restricted.

Therefore, the development of coke quenching systems with the advantages of energy conservation, less consumption, less environmental pollution, convenient operation and management and low equipment investment and maintenance cost is always the key research direction of the coking industry.

Disclosure of Invention

The technical scheme adopted by the invention is that the wet quenching device system comprises a waste gas treatment module, a spraying module, a nozzle cleaning module, a water circulation module and the like, wherein the waste gas treatment module, the spraying module, the nozzle cleaning module and the water circulation module are arranged at a sewage outlet below a flue 1 and form a quenching system together with the flue 1.

In the waste gas treatment module, a horn-shaped waste gas guide device 3 is arranged on a waste gas purification and dust removal grating device 2.

In the spraying module, a first rack 5 and a second rack 6 are arranged on a bracket 11 side by side, the first rack 5 and the second rack 6 are arranged in parallel, a first gear 7 and a second gear 8 are arranged on two sides of a spray head mounting bent frame 9, the first gear 7 is meshed with the first rack 6, and the second gear 8 is meshed with the second rack 5; the water delivery pipe 22 for the retractable nozzle and the water delivery pipe 23 for the retractable nozzle are connected to the nozzle mounting bent 9. Six spray head fixing devices 14 are arranged on the spray head mounting bent frame 9 side by side, and six spray heads 10 are respectively arranged on the six spray head fixing devices 14.

In the cleaning module, four telescopic cleaning device water ducts 22 connect the cleaning device mounting frame 12 with the clean water tank 21. On the cleaning device mounting frame 12, six cleaning nozzles 15 are mounted side by side, and three nozzle gripping mechanism claws 13 are mounted on the upper portion of each cleaning nozzle 15 in a surrounding manner.

In the water circulation module, a first-stage wastewater water tank 16 and a first-stage wastewater water tank 17 are connected with a second-stage wastewater water tank 20 through a wastewater lifting pipe 18 and a wastewater lifting pipe 19, a purified water tank 21 is positioned below the second-stage wastewater water tank 20, and a water purification membrane is arranged between the second-stage wastewater water tank 20 and the purified water tank 21.

Four infrared temperature measuring probes 24 are symmetrically arranged above the bracket 11.

The coke transport cart 4 is positioned in the space enclosed by the bracket 11.

The wet quenching generates a large amount of gas, so the quenching main body device is generally installed in the flue 1. The quenching process begins when the coke transport cart 4 enters the quenching body assembly enclosed by the cradle 11. Clean water in the clean water tank 21 is delivered to six spray heads 10 arranged on the spray head mounting bent frame 9 and the 6 spray head fixing devices 14 through a water delivery pipe 23 for telescopic spray heads, and the spray heads 10 spray water onto coke transported by the coke transport vehicle 4. The nozzle mounting bent 9 moves back and forth through the gear 7 and the gear 8, and each nozzle 10 can rotate in each direction, so that the aim of uniformly spraying the coke is fulfilled.

A certain amount of smoke is generated during the quenching process and after a certain period of time, the spray head 10 is clogged, thus requiring a cleaning operation. The cleaning device mounting frame 12 is extended out under the action of 4 telescopic cleaning device water pipes 22, and the spray head mounting bent frame 9 moves to the innermost end. And then the spray head grabbing mechanism claw 13 is opened, the cleaning spray head 15 is popped up, and the grabbing mechanism claw 13 is tightened after the spray head 10 is wrapped. The cleaning head 15 is rotated until the head 13 is separated from the head fixing unit 14. And (4) discharging water from the cleaning spray head 15, and stopping discharging water after the spray head 10 is washed clean. The cleaning head 15 is rotated in reverse until the head 13 is compactly mounted with the head fixing device 14.

As the quenching process is carried out, a large amount of condensed wastewater generated at the bottom of the tower is collected in the primary wastewater tank 16 and the primary wastewater tank 17, and the wastewater is subjected to precipitation removal to reduce the content of solid substances. Then lifted to a secondary wastewater tank 20 by a wastewater lifting pipe 18 and a wastewater lifting pipe 19. Purified water finally enters the purified water tank 21 for storage after being purified by a purification membrane existing between the secondary wastewater tank 20 and the purified water tank 21.

The exhaust gas treatment module is shown in figures 5 and 6. The waste gas generated in the coke quenching process is collected by the horn-shaped waste gas guiding device 3 and then enters the waste gas purification and dust removal grid device 2 containing a plurality of catalytic substances for the treatment of processes such as desulfurization and deacidification. And finally discharging the qualified waste gas after final treatment to the atmosphere through a flue 1.

The infrared temperature measurement probe 24 measures the coke temperature in the coke quenching process, controls the temperature in the coke quenching process and ensures the coke quality after coke quenching.

Compared with the prior art, the invention has the following technical advantages:

1. in the invention, because the water vapor is directly contacted with the coke for cooling, the problem of fan abrasion in the dry quenching process can be avoided, such as: in the process of cooling the coke dry quenching nitrogen, the nitrogen carries a large amount of coke powder particles, and the phenomena of collision, friction, erosion and the like between the coke powder particles and a circulating fan, a dust removal fan and the like occur; in the wet quenching technology designed by the invention, because the water vapor can react with the coke and the coke powder, the content of the coke powder in the water gas is reduced, the damage to a fan and other components can be reduced, and the maintenance cost of equipment can be reduced.

2. In the coke quenching process, a large amount of water resources are consumed, and the heat released by cooling coke and the condensed waste water are recycled, so that the water consumption can be saved by about 30 percent through theoretical calculation. In the process of recycling the waste water, large-particle waste in the waste water is firstly subjected to primary sedimentation, and then the secondary purification treatment is carried out on the settled waste water by utilizing the infiltration membrane so as to achieve the purpose of recycling. The process can reduce the cost of enterprises and play a role in environmental protection to a great extent.

3. The coke is cooled by the water with the temperature kept near 60 ℃, so that the temperature difference between the coke and the water is reduced, the increase of the number of microcracks of the coke caused by overlarge temperature difference is avoided, the quality of the coke is fully guaranteed, and good economic benefit can be obtained.

4. In the traditional wet quenching process, the spray head is always in a fixed position and a fixed direction, and the uniform cooling of coke is realized by the free rotation of the spray head in the direction and the back-and-forth movement of the spray head fixing device, so that the coke quality is ensured.

5. In a traditional wet quenching system, a spray head is blocked due to a large amount of smoke generated in the quenching process, so that the quenching efficiency is reduced and the coking effect is seriously influenced. According to the invention, by introducing the cleaning module, the spray head can be automatically disassembled and cleaned by using the fixture device, so that the operation cost of an enterprise can be reduced to a great extent, and meanwhile, the loss of the coke quenching system during maintenance is reduced.

6. In the process of wet quenching, a large amount of smoke and a large amount of harmful gases are generated, which is also a key environmental protection problem in the current coking industry. In the invention, in order to fully treat the waste gas generated in the coke quenching process, the waste gas is fully collected by using the horn-shaped drainage device and then is catalyzed by the grating device filled with various catalysts, so that the waste gas reaches the national emission standard.

7. In order to ensure the quality of coke, the temperature control requirement of the coke quenching process is very high, and the prior art is usually judged by experience. The invention introduces an infrared temperature measuring device to monitor the temperature in the coke quenching process, thereby ensuring the coke quality.

8. Compared with the dead plate and clumsy quenching system, the quenching system designed by the invention has skillful connection and the matching of each module and the mechanism; the coke quenching system is exquisite, and the whole system can ensure the environmental protection and high efficiency of the coke quenching process while realizing high-quality coke quenching.

Drawings

Fig. 1 is an overall structure diagram of a quenching tower.

Fig. 2 is a cross-sectional view of a quench tower.

Fig. 3 is an interior isometric view of fig. 1.

Fig. 4 is an inside isometric view of fig. 2.

Fig. 5 is a plan view of the exhaust gas purification module.

Fig. 6 is a bottom view of the exhaust gas purification module.

Fig. 7 is a free turning view of the sprinkler.

FIG. 8 is a schematic view of the cleaning module being prepared for cleaning.

Figure 9 is a schematic view of the cleaning module extended to open the clamp.

Fig. 10 is a schematic view of the tightening of the clamp.

FIG. 11 is a schematic view of the rotational lowering of the chuck to remove the showerhead.

Figure 12 is a schematic drawing of the cleaning apparatus retracted.

Figure 13 is a schematic view of the cleaning device with a high velocity water flow deoccluding nozzle.

Fig. 14 is a schematic view of a water circulation module.

Detailed Description

Because a large amount of harmful gas and water vapor are generated by wet quenching, the harmful gas needs to be treated by environmental protection equipment and then discharged. Therefore, the coke quenching main body system is arranged inside the flue 1 to complete the coke quenching process.

In actual production, after the coke transport vehicle 4 in a full-load high-temperature state enters a quenching main body device enclosed by the bracket 11, the quenching process formally starts. The wet quenching needs a large amount of water to cool the coke, a large amount of clean water is stored in the clean water tank 21, the clean water is conveyed to 6 spray heads 10 arranged on the spray head mounting bent frame 9 and the 6 spray head fixing devices 14 through the telescopic spray head water conveying pipe 23, and the spray heads 10 spray water onto the coke transported by the coke transport vehicle 4. Shower nozzle installation framed bent 9 passes through gear 7 and gear 8 and realizes the back-and-forth movement, and each shower nozzle can also rotate to each direction as required simultaneously, and the circulation is reciprocal, can enough guarantee like this that cooling water can evenly spray to the coke, also can make high temperature coke cool down to required temperature fast simultaneously.

With the continuous use of the quenching system, the spray heads 10 may become clogged over time due to certain smoke generated during the quenching process, which may require cleaning operations. When detecting that the spray head is blocked by dust, the spray head cleaning module can automatically disassemble, replace and dredge a certain blocked spray head, thereby solving the problem that the spray head is easy to block in wet quenching. When the cleaning module is required to operate, the cleaning device mounting frame 12 extends outwards under the action of the 4 telescopic cleaning device water conveying pipes 22, and meanwhile, the spray head mounting bent frame 9 moves to the innermost end. And then the spray head grabbing mechanism claw 13 is opened, the cleaning spray head 15 is popped up, and the grabbing mechanism claw 13 is tightened after the spray head 10 is wrapped. The cleaning head 15 is rotated until the head 13 is separated from the head fixing unit 14. And (4) discharging water from the cleaning spray head 15, and stopping discharging water after the spray head 10 is washed clean. The cleaning head 15 is rotated in reverse until the head 13 is compactly mounted with the head fixing device 14. Through the above process, the nozzle 10 is cleaned and can continue to work normally.

A large amount of water is used as a cooling medium for wet quenching, so that the generated waste water is fully recycled as far as possible, the environment-friendly requirement can be met, the cost can be reduced, the temperature of the quenching water can be kept near 60 ℃, and the safety and the quality of quenching are improved. The wastewater is collected and then enters a purification device and is then used as quenching, cleaning jigs, and the like. As the quenching process is carried out, a large amount of condensed wastewater generated at the bottom of the tower is collected in the primary wastewater tank 16 and the primary wastewater tank 17, and the wastewater is subjected to precipitation removal to reduce the content of solid substances. Then lifted to a secondary wastewater tank 20 by a wastewater lifting pipe 18 and a wastewater lifting pipe 19. Purified water finally enters the purified water tank 21 for storage after being purified by a purification membrane existing between the secondary wastewater tank 20 and the purified water tank 21. Through theoretical calculation, the process can save about 30 percent of water consumption for the quenching process.

During the wet quenching process, a large amount of waste gas is generated, and the waste gas is sucked into the processing equipment through the diversion device and then discharged. The waste gas generated in the coke quenching process is guided by the horn-shaped waste gas guiding device 3 and then enters the waste gas purification and dust removal grid device 2 containing a plurality of catalytic substances for the treatment of processes such as desulfurization and deacidification. And finally discharging the qualified waste gas after final treatment to the atmosphere through a flue 1.

The quenching process requires strict temperature control so as to ensure the quality of quenched coke. The infrared temperature measurement probe 24 measures the coke temperature in the coke quenching process, controls the temperature in the coke quenching process and ensures the coke quality after coke quenching. In the operation process of the system, the coke quenching degree is acquired in real time through the infrared sensor, and the rotatable spray head on the spray head seat is matched to move, so that the coke can be sprayed at different angles from any position, the coke quenching effect is improved, and the red coke rate is reduced.

Claims

1. A wet quenching device system is characterized in that: the device system comprises a waste gas treatment module, a spraying module, a nozzle cleaning module, a water circulation module and the like, wherein the waste gas treatment module, the spraying module, the nozzle cleaning module and the water circulation module are arranged at a sewage discharge port below a flue and form a coke quenching system together with the flue;

in the waste gas treatment module, a horn-shaped waste gas guide device is arranged on a waste gas purification and dust removal grid device;

in the spraying module, a first rack and a second rack are arranged on a support side by side and are arranged in parallel, a first gear and a second gear are arranged on two sides of a spray head mounting bent frame, the first gear and the first rack are meshed with each other, and the second gear and the second rack are meshed with each other; the water delivery pipe for the telescopic spray nozzle and the water delivery pipe for the telescopic spray nozzle are connected with the spray nozzle mounting bent frame; six spray head fixing devices are arranged on the spray head mounting bent frame side by side, and the six spray heads are respectively arranged on the six spray head fixing devices;

in the cleaning module, four telescopic cleaning device water conveying pipes connect the cleaning device mounting frame and the purified water tank together; six cleaning spray heads are arranged on the cleaning device mounting frame side by side, and three spray head grabbing mechanism claw claws are arranged on the upper part of each cleaning spray head in a surrounding manner;

in the water circulation module, a first-level wastewater water tank and a first-level wastewater water tank are connected with a second-level wastewater water tank through a wastewater lifting pipe and a wastewater lifting pipe, a water purification water tank is positioned below the second-level wastewater water tank, and a water purification membrane is arranged between the second-level wastewater water tank and the water purification water tank.

2. The wet quenching device system of claim 1, wherein: four infrared temperature probes are symmetrically arranged above the bracket.

3. The wet quenching device system of claim 2, wherein: the coke transport vehicle is positioned in the space enclosed by the brackets.

4. The wet quenching device system of claim 1, wherein: a large amount of gas is generated by wet quenching, so that the quenching main body device is arranged in the flue; after the coke transport vehicle enters a coke quenching main body device surrounded by the bracket, the coke quenching process is started; clean water in the clean water tank is conveyed to six spray heads arranged on the spray head mounting bent frame and the spray head fixing devices through a water conveying pipe for telescopic spray heads, and the spray heads spray water on coke transported by the coke transport vehicle; the nozzle mounting bent frame moves back and forth through the gear and the gear, and each nozzle can rotate towards each direction, so that coke can be uniformly sprayed.

5. The wet quenching device system of claim 1, wherein: certain smoke dust is generated in the coke quenching process, and the spray head is blocked after a period of time, so that the cleaning operation is required; the cleaning device mounting frame extends out under the action of the four telescopic cleaning device water conveying pipes, and meanwhile, the spray head mounting bent frame moves to the innermost end; then the claw of the spray head grabbing mechanism is opened, the cleaning spray head is ejected out, and the claw of the grabbing mechanism is tightened after the spray head is wrapped; the cleaning spray head rotates until the spray head is separated from the spray head fixing device; cleaning the spray head to discharge water, and stopping discharging water after the spray head is washed clean; the cleaning spray head rotates reversely until the spray head and the spray head fixing device are compactly installed.

6. The wet quenching device system of claim 1, wherein: with the coke quenching process, condensed wastewater generated at the bottom of the tower is collected in a primary wastewater tank and a primary wastewater tank, and the wastewater is subjected to precipitation removal to reduce the content of solid substances; then the wastewater is lifted to a secondary wastewater tank by a wastewater lifting pipe and a wastewater lifting pipe; purified water finally enters the purified water tank for storage after being purified by a purification membrane arranged between the secondary wastewater tank and the purified water tank.

7. The wet quenching device system of claim 1, wherein: waste gas generated in the coke quenching process is collected by a horn-shaped waste gas guide device and then enters a waste gas purification and dust removal grid device containing a plurality of catalytic substances for the treatment of the desulfurization and deacidification process; and finally discharging the qualified waste gas after final treatment to the atmosphere through a flue.

8. The wet quenching device system of claim 1, wherein: the infrared temperature measuring probe measures the coke temperature in the coke quenching process and controls the temperature in the coke quenching process.