Double-coal-blending tamping coking method of heat recovery coke oven

Abstract

The invention relates to a double-coal-blending tamping coking method for a heat recovery coke oven, which is characterized in that a coal cake of the heat recovery coke oven is in a tamping form, a coal charging and coke pushing car works on a coke oven machine side track, and blended bulk coal falls into a coal box consisting of a ground coal wall, a front baffle plate, an on-car coal charging bottom plate, a rear baffle plate and the like through a coal distribution device of a hydraulic tamping station; the bulk coal is tamped into a coal cake by a coal pressing device of the hydraulic tamping station, and the coal cake is dragged back to a coal charging car by a coal charging bottom plate; and the coke is pushed into a quenching car from the carbonization chamber by using a coke pushing rod, a coal cake is fed into the carbonization chamber by using a coal loading bottom plate, and the furnace door is closed after the coal loading bottom plate is drawn out. The invention ensures the stability of the quality of the produced coke, realizes that the performance of the coke product meets the requirements of a blast furnace, reduces the use amount of high-cost blended coal, avoids resource waste, and reduces the cost and increases the efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of heat recovery coke ovens, and in particular relates to a double-coal ramming coking method for a heat recovery coke oven. Background Art

[0002] The heat recovery coke oven is a clean, efficient and new type of coke oven. It uses ramming thick coal cakes, long coking cycle and negative pressure operation, which are different from conventional coke oven processes. This makes it have the characteristics of clean and environmentally friendly production process, wide adaptability of coal blending, and can use a high proportion of coal with poor adhesion and the resulting coke is dense. The heat recovery coke oven relies on the coal gas it generates for heating, and no external coal gas is required, resulting in a high coal cake burnout, basically around 5%.

[0003] The heating method of the heat recovery coke oven is that the coal cake is heated in the carbonization chamber and the raw coal gas is precipitated, which is mixed and burned with the air introduced from the primary air port set on the top of the furnace in the upper space of the carbonization chamber. The heat generated by the combustion directly heats the coal cake through heat conduction and heat radiation. The high-temperature exhaust gas generated by the combustion in the upper space of the carbonization chamber descends from the downcomers on the furnace walls on both sides of the carbonization chamber into the furnace bottom fire channel. The sealing walls on both sides of the machine coke of the furnace bottom fire channel are provided with individually adjustable secondary air ports. The combustible components in the high-temperature exhaust gas are completely burned out through the introduction of secondary air, and the temperature of the exhaust gas after combustion is mixed within the required temperature range. The heat of the high-temperature exhaust gas in the furnace bottom fire channel is transmitted to the carbonization chamber through the arch of the four-linked arch, and the coal cake is indirectly heated from the bottom. The heat required for heating the coke oven is generated by the mixed combustion of the coal gas and air generated by the combustion of the coal cake. This special heating method causes a high burnout of the coal cake, which is basically concentrated on the upper part of the coal cake, which needs to be solved. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a heat recovery coke oven double-coal ramming coking method, aiming to optimize the coal blending structure for coking coal ramming coal cakes, using relatively low-cost blending coal on the upper part of the coal cake to produce raw coal gas during the heating process, and the combustion of the raw coal gas and air generates heat for heating the coke oven to reduce the cost of blending coal, so as to solve the above-mentioned problem.

[0005] To achieve the above-mentioned purpose, the technical scheme adopted by the present invention is: a heat recovery coke oven double-coal ramming coking method, the coal cakes of the heat recovery coke oven are in ramming form, the coal loading and pushing coke car works on the side track of the coke oven machine, and the prepared loose coal falls into the coal box composed of the ground coal wall, the front baffle and the coal loading bottom plate and the rear baffle on the car by the coal distribution device of the hydraulic ramming station, and then the loose coal is rammed into coal cakes by the coal pressing device of the hydraulic ramming station, and the coal loading bottom plate drags the coal cakes back to the coal loading car; walk to the carbonization chamber ready for coking and coal loading, open the furnace door, use the coke pushing rod to push the coke from the carbonization chamber to the coke receiving and quenching car, and then use the coal loading bottom plate to send the coal cakes into the carbonization chamber, and close the furnace door after pulling out the coal loading bottom plate.

[0006] Preferably, the hydraulic tamping station consists of a track beam, a mobile trolley, a coal distributor, a hammer tamping machine, a hydraulic coal briquette device, a coal trough side wall mechanism, a front baffle, a hydraulic and electrical control system, there are one set of hammer tamping machine and one set of hydraulic coal briquette device, the hammer tamping machine is equipped with 8 tamping hammer rods, the hydraulic coal briquette device is driven by a double hydraulic cylinder, the travel drive is driven by a hydraulic motor, the travel speed is ~7.5m / min, and a set of vibration devices are arranged on both sides of the upper part of the coal distribution hopper to ensure smooth distribution.

[0007] Preferably, the coal cake gradually turns into coke cake after high-temperature smelting in a coking cycle. After the coke cake matures, it is pushed out by the coal-loading coke-pushing car and sent into the coke trough of the coke-quenching car. The coke-quenching car carries coke to the secondary coke-pushing station and aligns with the secondary coke-pushing chute. The fixed coke-pushing machine pushes the coke cake on the coke-quenching car and guides it into the dry coke quenching coke tank through the secondary coke-pushing chute. The coke tank carrier transports the coke tank carrying coke to the dry coke quenching system for quenching.

[0008] Preferably, during the coking process, the high-temperature waste gas returns to the ascending airway at the end of the furnace wall on the same side through the C-shaped fire channel at the bottom of the coke oven, and enters the machine and coke side ascending pipes located at the top of the coke oven respectively. A high-temperature waste gas collecting pipe is provided at the top of the machine and coke side ascending pipes on the furnace top, and is connected to the ascending pipe on the same side; the high-temperature waste gas enters the high-temperature waste gas converging pipe in the middle of the furnace top through the machine and coke side collecting pipes, crosses the coke oven vehicle and enters the coke oven waste heat recovery boiler, the waste heat recovery boiler absorbs the heat of the high-temperature waste gas to generate high-temperature ultra-high-pressure steam, and sends it to the steam turbine generator set for power generation, and the low-temperature waste gas after heat exchange in the waste heat recovery boiler enters the flue gas desulfurization and denitrification device for treatment and is discharged after meeting the standards.

[0009] The beneficial effects of the present invention are: 1. The coal bunker is transformed to realize that two kinds of mixed coal are stored in the coal tower, and the coal type can be switched in real time; 2. The coal cakes are rammed three times. The first two rammings are normal production proportioned coal to about 950-1000mm. The third ramming is low-cost inferior blended coal 40-50mm, which is used for combustion to generate coal gas to ensure the demand for raw coal gas for coke oven heating. 3. Ensure the stability of the quality of coke production, ensure that the performance of coke products meets the needs of blast furnaces, reduce the use of high-cost blending coal, avoid waste of resources, and reduce costs and increase efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of coal cakes in the carbonization chamber; Figure 2 It is a schematic diagram of three-layer briquettes; Figure 3 This is a diagram of coal cake burning in the carbonization chamber; Figure 4 This is a picture of coal cakes after burning in the carbonization chamber.

[0011] The numbers in the figure are: 1 is the carbonization chamber, 2 is the coal cake, 3 is the normal production coal blend, and 4 is the low-cost, weakly adhesive and highly volatile coal blend. DETAILED DESCRIPTION

[0012] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments: like Figures 1 to 4 As shown, a double-coal tamping coking method for a heat recovery coke oven is disclosed. The coal cakes of the heat recovery coke oven are in a tamping form. The coal-loading and coke-pushing car works on the side track of the coke oven machine. The prepared loose coal is dropped into a coal box composed of a ground coal wall, a front baffle, a coal-loading bottom plate on the car, and a rear baffle by a coal-distributing device of a hydraulic tamping station. The loose coal is then tamped into coal cakes by a coal-pressing device of the hydraulic tamping station. The coal-loading bottom plate drags the coal cakes back to the coal-loading car. The car moves to a carbonization chamber ready for coke discharge and coal loading, opens the furnace door, uses a coke-pushing rod to push the coke from the carbonization chamber into the coke-quenching car, uses the coal-loading bottom plate to deliver the coal cakes into the carbonization chamber, and closes the furnace door after the coal-loading bottom plate is pulled out.

[0013] The tamping station consists of a track beam, a mobile trolley, a coal distributor, a hammer tamping machine, a hydraulic briquette device, a coal trough side wall mechanism, a front baffle, a hydraulic and electrical control system, etc. There are one set of hammer tamping machine and one set of hydraulic briquette device. The hammer tamping machine is equipped with 8 tamping hammers; the hydraulic briquette device is driven by a double hydraulic cylinder. The travel drive is driven by a hydraulic motor, and the travel speed is ~7.5m / min. A set of vibration devices is set on both sides of the upper part of the coal distributor hopper to ensure smooth distribution.

[0014] After a coking cycle of high-temperature smelting, the coal cake gradually turns into coke cake. When the coke cake is mature, it is pushed out by the coal-loading coke pusher and sent into the coke trough of the coke quenching car. The coke quenching car carries the coke to the secondary coke pushing station and aligns with the secondary coke pushing chute. The fixed coke pusher pushes the coke cake on the coke quenching car and guides it into the dry coke quenching coke tank through the secondary coke pushing chute. The coke tank carrier transports the coke tank carrying the coke to the dry coke quenching system for quenching.

[0015] The high-temperature exhaust gas returns to the ascending airway at the end of the furnace wall on the same side through the C-shaped fire channel at the bottom, and enters the machine and coke side ascending pipes located at the top of the coke oven respectively. A high-temperature exhaust gas collecting pipe is set on the top of the machine and coke side ascending pipes on the furnace top, connected to the ascending pipe on the same side; the high-temperature exhaust gas enters the high-temperature exhaust gas converging pipe in the middle of the furnace top through the machine and coke side collecting pipes, crosses the coke oven vehicle and enters the coke oven waste heat recovery boiler. The waste heat recovery boiler absorbs the heat of the high-temperature exhaust gas to generate high-temperature ultra-high-pressure steam, which is sent to the steam turbine generator set for power generation. The low-temperature exhaust gas after heat exchange in the waste heat recovery boiler enters the flue gas desulfurization and denitrification device for treatment and is discharged after meeting the standards.

[0016] The original tamping method is that the single-ratio coal stored in the coal tower is put into the coal hopper of the tamping machine below the coal tower through the electro-hydraulic gate at the bottom of the coal tower, and then evenly distributed into the coal box to be tamped into coal cakes. The tamping machine adopts a hammer + hydraulic composite tamping machine, which is divided into three layers of tamping. The first two layers are hammer tamping, and the last layer is hydraulic forming tamping. The surface of the coal cake is flattened and a coal gas rapid outlet groove is opened. Due to the unique coke oven structure, the coal cake burnout is about 5%, and the upper burnout loss of the coal cake is about 50mm. The present invention transforms the original coal tower. The original coal tower coal bunker is 2 bunkers, which are divided into 4 bunkers by adding partitions, so that two sets of mixed coal can be stored in the coal tower. Since the proportion of coal cakes for upper combustion is relatively small, 3 bunkers are set for normal production coal, and 1 bunker is for the upper 50mm burnt coal. Normal coal cakes are rammed twice to 950mm, and the upper part is increased by about 50mm. The hydraulic forming and ramming of poor quality and low cost anthracite, coke powder or low-cost mixed coal can be achieved, which can reduce the cost of mixed coal while ensuring the stability of coke quality and normal production of coke ovens.

[0017] The advantages of the present invention are as follows: 1. The coal bunker is transformed to realize that two kinds of proportioned coal are stored in the coal tower, and the coal type can be switched in real time; 2. The coal cake is rammed three times, the first two times of ramming are normal production proportioned coal to about 950-1000mm, and the third time of ramming is low-cost inferior compound coal of 40-50mm, which is used for combustion to generate coal gas to ensure the demand for raw coal gas required for coke oven heating; 3. The stability of the quality of coke production is guaranteed, the performance of coke products meets the needs of blast furnaces, the use of high-cost compound coal is reduced, resource waste is avoided, and costs are reduced and efficiency is increased.

[0018] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A heat recovery coke oven double-coal ramming coking method, characterized in that: The coal cakes of the heat recovery coke oven are in the form of tamping. The coal-loading and coke-pushing car works on the side track of the coke oven machine. The prepared loose coal is dropped into the coal box composed of the ground coal wall, the front baffle and the coal-loading bottom plate and the rear baffle on the car by the coal-distributing device of the hydraulic tamping station. The loose coal is then tamped into coal cakes by the coal-pressing device of the hydraulic tamping station, and the coal-loading bottom plate drags the coal cakes back to the coal-loading car. The car moves to the carbonization chamber ready for coke discharge and coal loading, opens the furnace door, uses the coke-pushing rod to push the coke from the carbonization chamber into the coke-quenching car, and then uses the coal-loading bottom plate to send the coal cakes into the carbonization chamber. The furnace door is closed after the coal-loading bottom plate is pulled out.

2. The heat recovery coke oven double-coal ramming coking method according to claim 1, characterized in that: The hydraulic tamping station consists of a track beam, a mobile trolley, a coal distributor, a hammer tamping machine, a hydraulic coal briquette device, a coal trough side wall mechanism, a front baffle, a hydraulic and electrical control system. There are one set of hammer tamping machine and one set of hydraulic coal briquette device. The hammer tamping machine is equipped with 8 tamping hammer rods. The hydraulic coal briquette device is driven by a double hydraulic cylinder and the travel drive is driven by a hydraulic motor with a travel speed of ~7.5m / min. A set of vibration devices is arranged on each side of the upper part of the coal distribution hopper to ensure smooth distribution.

3. The heat recovery coke oven double-coal ramming coking method according to claim 1, characterized in that: The coal cake is gradually transformed into coke cake after high-temperature smelting in a coking cycle. When the coke cake is mature, it is pushed out by the coal-loaded coke pushing car and sent into the coke trough of the coke quenching car. The coke quenching car carries the coke to the secondary coke pushing station and is aligned with the secondary coke pushing chute. The fixed coke pushing machine pushes the coke cake on the coke quenching car and guides it into the dry coke quenching coke tank through the secondary coke pushing chute. The coke tank carrier sends the coke tank carrying the coke to the dry coke quenching system for quenching operation.

4. The heat recovery coke oven double-coal ramming coking method according to claim 1, characterized in that: During the coking process, the high-temperature exhaust gas passes through the C-shaped fire channel at the bottom of the coke oven and returns to the ascending air duct at the end of the furnace wall on the same side, and enters the machine and coke side ascending pipes at the top of the coke oven respectively. A high-temperature exhaust gas collecting pipe is arranged on the top of the machine and coke side ascending pipes on the furnace top, which are connected to the ascending pipes on the same side; the high-temperature exhaust gas enters the high-temperature exhaust gas junction pipe in the middle of the furnace top through the machine and coke side collecting pipes, crosses the coke oven vehicle and enters the coke oven waste heat recovery boiler. The waste heat recovery boiler absorbs the heat of the high-temperature exhaust gas to generate high-temperature ultra-high-pressure steam, which is sent to the steam turbine generator set for power generation. The low-temperature exhaust gas after heat exchange in the waste heat recovery boiler enters the flue gas desulfurization and denitrification device for treatment and is discharged after meeting the standards.

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