CN201704263U - Dry quenching coke energy saving and emission reduction device - Google Patents

Abstract

The utility model provides an energy-saving and emission-reducing device for coke CDQ, which comprises a fan connected to a sequential air duct, a reduction cooler, a dust collector, a waste heat boiler and a discharger, and the fan is placed before the reduction cooler, and is characterized in that: The reduction cooler is divided into a combustion chamber, a reduction section and a cooling section from top to bottom; a furnace cover is provided on the top of the combustion chamber, and an air inlet is opened on the middle and lower furnace wall of the combustion chamber; the upper furnace wall of the reduction section is There is a gas outlet, and the gas outlet communicates with the waste heat boiler through the dust collector; the cooling section gradually shrinks downward to form a coke discharge outlet; the discharger is a spiral discharger, and the coke discharge outlet is connected to the water-sealed The screw discharger is connected. The utility model has the advantages of reasonable structure, low cost and high efficiency, which can greatly reduce the consumption of cooling gas, reduce the power consumption of fans, recover coke heat to reach the normal coke discharge temperature, realize energy saving and emission reduction, and have excellent industrial prospects and extensive social benefit.

Description

CDQ energy saving and emission reduction device

technical field

The invention relates to the field of dry coke quenching, in particular to a coke dry quenching device.

Background technique

At present, coke dry quenching technology (CDQ, Coke Dry Quinching) is a technology that uses low-temperature inert gas (circulation) to exchange heat with red coke in a CDQ furnace to cool red coke. Generally speaking, the device used for CDQ process consists of red coke loading device, cold coke discharge device, CDQ furnace, gas circulation equipment, waste heat boiler and other auxiliary supporting facilities. The cooling medium is generally nitrogen, and the gas circulation equipment blows it into the CDQ furnace. The nitrogen gas takes away the sensible heat of the coke through heat exchange. The high-temperature nitrogen gas at the outlet of the CDQ furnace enters the waste heat boiler after dust removal, and generates steam to recover heat. The circulating fan is sent back to the CDQ furnace. Generally, CDQ technology uses nitrogen to take away the sensible heat of red-hot coke, generates steam, and uses it to generate electricity. There are many heat transfer steps, and the utilization efficiency is low. It does not involve the utilization of flue gas carbon dioxide, and cannot achieve the effect of emission reduction. The fans used for blasting consume a lot of energy, and the equipment maintenance costs are high and difficult. They do not make much contribution to energy saving and emission reduction. Moreover, CDQ technology is mostly imported, and the investment is huge.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the limitations and deficiencies of the above-mentioned prior art that have low heat utilization efficiency and have no effect on the reduction of carbon dioxide emissions in the flue gas, and provide a kind of energy-saving and emission-reducing, high-efficiency, low-cost Low CDQ energy saving and emission reduction device.

Technical scheme of the present invention is:

CDQ energy-saving and emission-reduction device, including fans connected by sequential air ducts, reduction coolers, dust collectors, waste heat boilers and dischargers, fans are placed in front of the reduction coolers, and it is characterized in that: the reduction coolers are from top to bottom The bottom is divided into a combustion chamber, a reduction section and a cooling section; the top of the combustion chamber is provided with a furnace cover, and an air inlet is opened on the middle and lower furnace wall of the combustion chamber; a gas outlet is opened on the upper furnace wall of the reduction section. The gas outlet communicates with the waste heat boiler through the dust collector; the cooling section gradually shrinks downward to form a coke discharge outlet; the discharger is a screw discharger, and the coke discharge outlet communicates with a water-sealed screw discharger.

Further, the technical solution of the utility model can also be:

The furnace wall of the cooling section is a water-cooled wall, and the water-cooled wall is provided with arranged and distributed water-cooled pipes inside the wall, and cooling water is passed inside, and the water-cooled wall is coated with wear-resistant materials.

An internal water cooling wall is arranged inside the cooling section, and the internal water cooling walls are arranged in a cross or horizontal row, and the water pipes in the internal water cooling wall communicate with the water pipes of the furnace body.

Fins are arranged at certain intervals in the inner water wall, the width of the fins is 50mm-100mm, the interval between adjacent fins is 50mm-80mm, and the length of the fins is the height of the cooling section.

The screw discharger is driven by a frequency conversion speed regulating motor to adjust the discharge speed.

The coke discharge outlet utilizes a water seal to prevent gas leakage and air entry.

The furnace walls of the combustion chamber and the reducing section are of double-layer structure, the inner wall is made of ordinary refractory bricks, and the outer wall is covered with thermal insulation materials.

A _CO2 inlet is opened on the furnace wall at the lower part of the cooling section.

The CDQ energy-saving and emission-reducing device of the utility model has reasonable structure, low cost and high efficiency, utilizes the heat absorption property of the reduction reaction and the large gas heat capacity characteristics, greatly reduces the amount of cooling gas, and reduces the power consumption of the fan. Use the heat of recovered coke to convert carbon dioxide into carbon monoxide, and use the water wall to recover the remaining sensible heat of coke in the form of steam, so that the coke can reach the normal coke discharge temperature to achieve energy saving and emission reduction. And the spiral design controls the defocusing speed. Because the reaction gas is harmful to the human body and the environment, a water seal is used for the coke discharge, which has the advantage of not only reducing the coke to the safest temperature, but also preventing the gas from escaping from the device, causing harm to the environment and the human body. It also prevents air from entering the device to ignite coke and cause explosion. The CDQ energy-saving and emission-reducing device of the utility model has excellent industrial prospects and extensive social benefits.

Description of drawings

Fig. 1 is a structural schematic diagram of the CDQ energy saving and emission reduction device of the present invention.

Fig. 2 is a structural schematic diagram of the cross water wall of the present invention.

Explanation of reference signs:

1 Combustion chamber, 2 Reduction section, 3 Cooling section, 4 Frequency conversion motor, 5 Water seal water inlet, 6CO2 inlet, 7 Water wall pipe, 8 Insulation material, 9 Refractory brick, 10 Air inlet, 11 Furnace cover, 12 Exhaust Valve, 13 coke discharge outlet, 14 red hot coke, 15 gas outlet, 16 dust collector, 17 waste heat boiler, 18 steam outlet, 19 cooling water inlet, 20 screw discharger, 21 boiler gas outlet, 22 coke water sealing water outlet , 23 water sealing water, 24CO ₂ , 25 wide fins, 26 narrow fins, 27 water wall pipes, 28 cross staves, 29 wear-resistant materials.

Detailed ways

Specific embodiments of the present utility model are described in detail below in conjunction with the accompanying drawings.

As shown in accompanying drawing 1, the coke CDQ energy-saving and emission-reducing device of the present utility model comprises a blower fan (not shown in the figure) connected by the sequential air duct, a reducing cooler, a dust collector 16, a waste heat boiler 17 and a discharge device. A fan is placed in front of the reduction cooler, wherein the reduction cooler is divided into a combustion chamber 1, a reduction section 2 and a cooling section 3 from top to bottom, a furnace cover 11 is arranged on the top of the combustion chamber 1, and a Air inlet 10; gas outlet 15 is opened on the upper furnace wall of the reduction section, and the gas outlet communicates with the dust collector through the gas outlet pipe, and further communicates with the waste heat boiler 17; the cooling section 3 gradually shrinks downward to form a coke discharge outlet 13 , The coke discharge outlet 13 communicates with the water-sealed screw discharger 20 .

In this example, the furnace wall in the cooling section is a water-cooled wall, and water-cooled pipes 7 arranged and distributed are arranged in the wall, and cooling water is passed through the inside. water pipe breakage.

The interior of the cooling section of the utility model can also be provided with an internal water cooling wall according to the production capacity and the size of the reduction cooler, and the water pipes in the internal water cooling wall communicate with the water pipes of the furnace body to jointly participate in coke cooling and generate steam. Because the thermal conductivity of coke is small, that is, the thermal resistance is large, when the cross-sectional area of the cooling section is large, the heat of the central coke cannot be transmitted in time, and the cooling effect is poor. The coke heat is taken away in time. The internal water cooling walls can be arranged in a criss-cross arrangement as shown in Figure 2, or in a horizontal arrangement (not shown in the figure). The intersecting or horizontal internal water cooling walls can also play the role of uniform distribution of gas: the gas sent from the bottom of the economizer can be evenly distributed into each space separated by the internal water cooling walls through the gas distributor.

Fins are arranged at certain intervals on the inner water wall, the width of the fins is 50mm-100mm, the interval between adjacent fins is 50mm-80mm, and the length of the fins is the height of the cooling section. The arrangement of the fins can increase the heat dissipation area of the coke to the water wall, that is, increase the heat transfer area of the water wall and the coke. Please tell me if the internal water cooling wall has the effect of lowering the coke temperature further, is there anything else? The width of the fins can be the same, and it is preferable that the widths of adjacent fins are different. Having a difference in width can avoid coke erecting and blocking in the middle of the fins as much as possible, which will affect production.

The screw discharger of the utility model is driven by a frequency conversion speed regulating motor to adjust the discharge speed according to the design value of the coke discharge, and discharges the coke. At the outlet of the discharger, the sealing water and the coke are discharged together.

The coke discharge outlet of the utility model utilizes a water seal to prevent gas leakage and air entry.

The furnace wall of the combustion chamber and the reduction section of the utility model has a double-layer structure, the inner wall is made of common refractory bricks, and the outer wall is covered with heat-insulating materials.

A _CO2 inlet 6 is opened on the furnace wall at the lower part of the cooling section.

The working principle of the utility model is: open the furnace cover 12, put red hot coke 14 into the combustion section 1 of the coke oven, determine the amount of air introduced through the temperature measurement, and introduce the combustion section through the air inlet 10. The coke burns, and finally the temperature of the coke rises to 1200°C (the higher the reaction temperature of C and _CO2 , the faster the reaction speed, but if the temperature exceeds 1200, the coke will slag and stick to the wall to affect the operation of the equipment). With the progress of coke discharge at the bottom, the red hot coke at 1200 degrees falls from the combustion section 1 into the reduction section 2, and in this section, an endothermic reduction reaction occurs with the CO ₂ rising from the bottom CO ₂ inlet 6 to produce CO. After the gas outlet 15 is dedusted by the dust collector 16, it enters the waste heat boiler 17 for waste heat recovery and generates steam. As the reaction progresses, the temperature of the coke decreases with the falling of the coke until it reaches the reaction termination temperature. At this time, the coke enters the cooling section 3 of the reduction cooler. In the cooling section, the coke and the cooling water indirect heat exchange to generate high-pressure steam. The steam passes through The steam outlet 18 is discharged, and the coke temperature after cooling is about 250-350°C. A water seal is used at the coke discharge outlet of the reduction cooler to prevent gas leakage and air entry. The coke at 250-350°C finally falls into the water-sealed screw discharger, which is driven by a frequency conversion speed regulating motor to discharge coke according to the design value of coke discharge. At the outlet of the discharger, water seals water and coke discharge together. The moisture in the wet coke that reaches the coke discharge temperature of about 200°C is easy to volatilize, so the moisture content of the final coke is not high.

The water sealing water of the screw discharger controls the flow rate and then controls the temperature change of the water sealing water, so that the temperature change of the water sealing water does not exceed 10°C.

The CDQ energy saving and emission reduction device of the utility model adopts the coke discharge in the form of spiral discharge, and the coke discharge speed is controlled by the rotating speed and the design of the spiral. Because the reaction gas is harmful to the human body and the environment, the water seal is used for coke discharge. The advantage is that it can not only reduce the coke to the safest temperature, but also prevent the gas from escaping from the reduction cooler, causing harm to the environment and human body. It also prevents air from entering the reduction cooler to ignite coke and cause an explosion.

The above only illustrates the specific embodiments of the utility model, but does not limit the protection scope of the utility model in any form. Any equivalent change or modification made according to the design spirit of the utility model shall be considered as falling Into the scope of protection of the utility model.

Claims (8)

1. CDQ energy-saving and emission-reduction device, including fans connected by sequential air ducts, reduction coolers, dust collectors, waste heat boilers and dischargers, fans are placed in front of the reduction coolers, and it is characterized in that: the reduction coolers are automatically From top to bottom, it is divided into a combustion chamber, a reduction section and a cooling section; the top of the combustion chamber is provided with a furnace cover, and an air inlet is opened on the middle and lower furnace wall of the combustion chamber; a gas outlet is opened on the upper furnace wall of the reduction section , the gas outlet communicates with the waste heat boiler through a dust collector; the cooling section gradually shrinks downward to form a coke discharge outlet; the discharger is a screw discharger, and the coke discharge outlet is connected to a water-sealed connected. 2. The CDQ energy-saving and emission-reducing device according to claim 1, characterized in that: the furnace wall of the cooling section is a water-cooled wall, and the water-cooled wall is provided with arranged and distributed water-cooled pipes inside the wall, through which cooling water is passed. The water wall is internally coated with wear-resistant materials. 3. The CDQ energy saving and emission reduction device according to claim 2, characterized in that: an internal water cooling wall is arranged inside the cooling section, the internal water cooling walls are arranged in a cross or horizontal arrangement, and the water pipes in the internal water cooling wall It communicates with the water pipe of the furnace body. 4. The coke CDQ energy saving and emission reduction device according to claim 3, characterized in that: fins are arranged at certain intervals in the inner water cooling wall, the width of the fins is 50mm-100mm, and the gap between adjacent fins is The interval between the fins is 50 mm to 80 mm, and the length of the fins is the height of the cooling section. 5. The coke CDQ energy saving and emission reduction device according to any one of claims 1-4, characterized in that: the screw discharger is driven by a frequency conversion speed regulating motor to adjust the discharge speed. 6. The coke CDQ energy saving and emission reduction device according to claim 5, characterized in that: the coke discharge outlet uses a water seal to prevent gas leakage and air entry. 7. The coke CDQ energy-saving and emission-reduction device according to claim 6, characterized in that: the furnace walls of the combustion chamber and the reduction section are of double-layer structure, the inner wall is made of ordinary refractory bricks, and the outer wall is covered with thermal insulation materials. 8. The coke CDQ energy saving and emission reduction device according to claim 1, characterized in that: a CO ₂ inlet is opened on the furnace wall at the lower part of the cooling section.

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