CN111795499A - Hot blast stove with high-speed hedging rotational flow adjustable premixing heat accumulator backflow high-temperature combustion - Google Patents
Hot blast stove with high-speed hedging rotational flow adjustable premixing heat accumulator backflow high-temperature combustion Download PDFInfo
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- CN111795499A CN111795499A CN202010675714.8A CN202010675714A CN111795499A CN 111795499 A CN111795499 A CN 111795499A CN 202010675714 A CN202010675714 A CN 202010675714A CN 111795499 A CN111795499 A CN 111795499A
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 83
- 238000009826 distribution Methods 0.000 claims abstract description 41
- 238000009825 accumulation Methods 0.000 claims abstract description 37
- 239000011819 refractory material Substances 0.000 claims abstract description 13
- 239000002184 metal Substances 0.000 claims abstract description 12
- 239000007789 gas Substances 0.000 claims abstract description 8
- 239000003034 coal gas Substances 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 13
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 9
- 239000003546 flue gas Substances 0.000 claims description 9
- 230000035939 shock Effects 0.000 claims description 6
- 229920000742 Cotton Polymers 0.000 claims description 4
- 230000001172 regenerating effect Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 229910010293 ceramic material Inorganic materials 0.000 claims description 2
- 239000000428 dust Substances 0.000 claims description 2
- 238000010992 reflux Methods 0.000 claims description 2
- 238000009423 ventilation Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 14
- 230000008569 process Effects 0.000 abstract description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 4
- 238000005457 optimization Methods 0.000 abstract description 4
- 238000005728 strengthening Methods 0.000 abstract description 4
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 3
- 238000005338 heat storage Methods 0.000 description 20
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000011449 brick Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
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- 230000002787 reinforcement Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H3/00—Air heaters
- F24H3/02—Air heaters with forced circulation
- F24H3/04—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
- F24H3/0488—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using fluid fuel
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/60—Devices for simultaneous control of gas and combustion air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/62—Mixing devices; Mixing tubes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M5/00—Casings; Linings; Walls
- F23M5/02—Casings; Linings; Walls characterised by the shape of the bricks or blocks used
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1854—Arrangement or mounting of grates or heating means for air heaters
- F24H9/1877—Arrangement or mounting of combustion heating means, e.g. grates or burners
- F24H9/1881—Arrangement or mounting of combustion heating means, e.g. grates or burners using fluid fuel
Abstract
The invention relates to a high-speed hedging rotational flow adjustable premixing heat accumulator backflow high-temperature combustion hot blast stove, which further realizes the controllable strengthening of the combustion process and the high efficiency and optimization of the low-nitrogen and heat transfer processes.A technical scheme for solving the problems is that the whole hot blast stove is formed by building a closed wall body built by refractory materials in a metal shell, a premixing chamber wall body, a heat accumulation combustion chamber wall body, a heat accumulation chamber wall body and a cold air chamber wall body are sequentially arranged in a stove shell from top to bottom, and the internal spaces of the hot blast stove are respectively a premixing chamber for providing mixed combustion of gas and air, a heat accumulation combustion chamber for stacking backflow high-temperature combustion-supporting heat accumulators, a heat accumulation chamber for stacking medium-temperature heat accumulators and low-temperature heat accumulators and a cold air chamber for adjusting the distribution of inlet; the hot blast stove can generally improve the air supply temperature by 50 ℃ to 80 ℃, and the air supply period temperature fluctuation can be controlled at 40 ℃ to 60 ℃, so that the hot blast stove is an innovation on the hot blast stove.
Description
Technical Field
The invention relates to hot blast stove type heat utilization equipment, in particular to thermal equipment for providing process hot air flow for a blast furnace, a smelting furnace, a retort furnace, a drying furnace, an incinerator and the like, namely a high-speed hedging rotational flow adjustable premix heat accumulator backflow high-temperature combustion hot blast stove.
Background
For the hot blast stove which adopts combustion airflow to heat the porous heat accumulator and air supply cold airflow to cool the porous heat accumulator so as to generate high-temperature (or high-pressure) process hot airflow, the working performance of the hot blast stove is directly influenced by the combustion process of gas fuel and the heat transfer process of the periodic heat storage and heat release of the porous body. With the progress of modern industrial technology, higher technical requirements are also put forward on the hot blast stove, and the hot blast stove mainly reflects in four main aspects of energy conservation, high efficiency, stability, environmental protection and the like. In order to achieve the above objects or partially achieve the above requirements, the technical innovation and technical progress of the hot blast stove have never been stopped, such as various combustion devices of the hot blast stove, which are proposed for improving the combustion process, all have the effects of improving and promoting the air flow mixing, optimizing and strengthening the combustion, and such as the application of checker brick heat accumulators with various structures and different performances, which are embodied in the selection of various heat accumulation materials, the change of the structure and the shape of the heat accumulator, the relative perfect calculation of heat energy and the like, all promote the optimization and the strengthening of the heat transfer and the heat accumulation performance; and by means of the development of a numerical simulation technology, the airflow flow field in the furnace is reasonably organized and controlled, the uniform distribution state of combustion airflow and the uniform distribution characteristic of air supply airflow in a heat accumulator are improved, and finally, the optimization and the reinforcement of the heat transfer process are integrally realized. It is necessary to point out that with the advanced science and technology of combustion, flow and heat transfer, the technology of porous medium combustion has developed sufficiently, and the practical application of the related technology is also endlessly. In addition, the implementation of national mandatory measures for environmental governance makes ultralow emission become a normal state, the requirements on dust removal, desulfurization and denitration indexes of flue gas of combustion equipment are increasingly strict, and the ultralow nitrogen combustion of coal gas and the ultralow emission of the flue gas also become inseparable important parts of hot blast stove technology. Therefore, the hot blast stove with swirl premixing and controllable combustion arranged at multiple air gas inlets is invented by combining the process characteristics of flowing, heat transfer and combustion in the hot blast stove, so that the aims of strengthening and controlling the combustion process, further optimizing the heat transfer process, efficiently saving and the like are fulfilled on the basis of simplifying the structure of the hot blast stove.
Disclosure of Invention
In view of the above situation, in order to overcome the defects in the prior art, the present invention aims to provide a high-speed opposite-flushing rotational flow adjustable premix heat accumulator backflow high-temperature combustion hot blast stove, which further realizes controllable enhancement of the combustion process and high efficiency and optimization of the low-nitrogen and heat transfer processes.
The technical scheme includes that the heat-storage type gas-fired boiler is integrally formed by building a closed wall body built by refractory materials in a metal shell, a premixing chamber wall body, a heat-storage combustion chamber wall body, a heat storage chamber wall body and a cold air chamber wall body are sequentially arranged in the shell from top to bottom, and the internal spaces of the premixing chamber wall body, the heat-storage combustion chamber wall body, the heat storage chamber wall body and the cold air chamber wall body are respectively a premixing chamber for providing mixed combustion of gas and air, a heat storage chamber for stacking a backflow high-temperature combustion-supporting heat accumulator, a heat storage chamber for stacking a medium-temperature heat accumulator and a low-temperature heat; the premixing chamber is a space with an opening at the lower part, the space is composed of a hemispherical wall body of the premixing chamber and a cylindrical wall body, the top of the hemispherical wall body of the premixing chamber is provided with an air flow adjusting air inlet pipe, a gas rotational flow inlet pipe and an air rotational flow inlet pipe are symmetrically arranged on the cylindrical wall body of the premixing chamber along the circumferential direction, a hot air outlet pipe communicated with the premixing chamber is arranged on the cylindrical wall body of the premixing chamber, the opening at the lower part of the premixing chamber is an outlet of the premixing chamber and is communicated with a heat accumulation combustion chamber below the premixing chamber, the heat accumulation combustion chamber is a space formed by combining an ellipsoidal wall body and a cylindrical wall body of the heat accumulation combustion chamber, the heat accumulation combustion chamber is filled with a backflow combustion-supporting high-temperature heat accumulator, the top of the wall body of the heat accumulation combustion chamber is provided with an, the heat storage chamber is a space surrounded by cylindrical heat storage chamber walls, the upper inner layer wall of the heat storage chamber wall is directly inserted into the cylindrical section of the heat storage combustion chamber wall and is in sliding sealing connection with the heat storage chamber wall, the lower wall of the heat storage chamber wall is connected with the cold air chamber wall into a whole, and a medium-temperature heat storage body and a low-temperature heat storage body are stacked in the heat storage chamber from top to bottom; the cold air chamber is of a cylindrical cup-shaped structure consisting of a cylindrical cold air chamber wall body and a disc-shaped furnace bottom, concentric circles of cold air chamber airflow distribution annular walls are built at the bottom of the cold air chamber airflow distribution annular walls, cold air chamber airflow distribution annular channels are formed among the cold air chamber airflow distribution annular walls and between the cold air chamber airflow distribution annular walls and the cold air chamber wall body, multiple layers of cold air inlet nozzles are arranged on the cold air chamber airflow distribution annular walls along the circumferential direction and used for communicating the cold air chamber airflow distribution annular channels and the cold air chamber central part, block-shaped heat accumulator porous bearing plates are laid on the top of the cold air chamber airflow distribution annular walls from inside to outside along the annular channels so as to facilitate stacking of low-temperature heat accumulators on the cold air chamber airflow distribution annular walls, and cold air inlet pipes and flue gas outlet pipes are arranged on the cold air.
The hot blast stove has the advantages of uniform air flow distribution, reflux combustion in the high-strength high-temperature heat accumulator, uniform, high-strength and efficient heat transfer, and simultaneously has the remarkable characteristics of higher cost performance (enabling the combustion chamber to be a place for stacking the high-temperature heat accumulator and enabling the multi-layer annular wall of the cold air chamber to play a role of the heat accumulator) and energy conservation and environmental protection. If the design, material selection and masonry are reasonably in place, the structural stability and the long service life are quite determined, the air heating furnace can generally improve the air supply temperature by 50-80 ℃, the fluctuation energy of the air supply period temperature can be controlled at 40-60 ℃, and the space of the air heating furnace is more reasonably and effectively utilized due to the fact that a combustion chamber and a cold air chamber which have practical significance are not provided, so that the air heating furnace is a prominent technical innovation on the air heating furnace.
Drawings
FIG. 1 is a front view in longitudinal section of a hot blast stove according to the invention.
FIG. 2 is a cross-sectional view of a premixing chamber of a hot blast stove in accordance with the present invention.
FIG. 3 is a sectional view of the cold air chamber of the hot blast stove of the present invention.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
As shown in figures 1-3, the whole body of the invention is formed by building a closed wall body built by refractory materials in a metal shell, a premixing chamber wall body 1, an adiabatic combustion chamber wall body 2, a regenerator wall body 3 and a cold air chamber wall body 4 are arranged in the shell from top to bottom in sequence, and the internal spaces of the premixing chamber wall body 1, the adiabatic combustion chamber wall body 2-1 for stacking a backflow high-temperature combustion-supporting heat accumulator 2-2, the regenerator 3-1 for stacking a medium-temperature heat accumulator 3-2 and a low-temperature heat accumulator 3-3 (porous media or lattice bricks) and the cold air chamber 4-1 for regulating the distribution of air flow at the inlet and the outlet respectively; the premixing chamber 1-1 is a space with an opening at the lower part, the space is composed of a hemispherical wall body of a premixing chamber wall body 1 and a cylindrical wall body, the hemispherical wall body top of the premixing chamber wall body 1 is provided with an air flow adjusting air inlet pipe 1-7, the cylindrical wall body is circumferentially and symmetrically provided with a gas rotational flow inlet pipe 1-2 and an air rotational flow inlet pipe 1-3, the cylindrical wall body of the premixing chamber wall body 1 is provided with a hot air outlet pipe 1-6 communicated with the premixing chamber 1-1, the opening at the lower part of the premixing chamber 1-1 is a premixing chamber outlet 1-4 and communicated with a heat accumulation combustion chamber 2-1 below the premixing chamber, the heat accumulation combustion chamber 2-1 is a space formed by combining an ellipsoidal wall body and a cylindrical wall body of the heat accumulation combustion chamber wall body 2 and is filled with a backflow combustion-supporting high-temperature heat accumulator 2-2, the top of the heat accumulation combustion chamber wall body 2 is provided, the structure of the device is a gradually enlarged cylindrical channel, a frustum-shaped central airflow guide block 2-3 supported by the top of a combustion-supporting high-temperature heat accumulator 2-2 is arranged in the center of the device, a heat accumulator 3-1 is a space enclosed by a cylindrical heat accumulator wall 3, the upper inner wall of the heat accumulator wall 3 is directly inserted into the cylindrical section of the heat accumulation combustion chamber wall 2 and adopts a slidable sealing connection mode with the heat accumulator, the lower wall is connected with a cold air chamber wall 4 into a whole, and a medium-temperature heat accumulator 3-2 and a low-temperature heat accumulator 3-3 are stacked in the heat accumulator 3-1 from top to bottom; the cold air chamber 4-1 is a cylindrical cup-shaped structure consisting of a cylindrical cold air chamber wall body 4 and a disc-shaped furnace bottom 5, a concentric multi-circle cold air chamber airflow distribution annular wall 4-3 is built at the bottom of the cold air chamber airflow distribution annular wall, cold air chamber airflow distribution annular channels 4-4 are formed among the cold air chamber airflow distribution annular walls 4-3 and between the cold air chamber airflow distribution annular walls and the cold air chamber wall body 4, cold air inlet nozzles 4-5 which are arranged in a multi-layer mode are arranged on the cold air chamber airflow distribution annular wall 4-3 along the circumferential direction and are used for communicating the cold air chamber airflow distribution annular channels 4-4 and the central part of the cold air chamber 4-1, block-shaped heat accumulator porous bearing plates 4-7 are laid on the top of the cold air chamber airflow distribution annular wall 4-3 from inside to outside along the annular channels so as to facilitate the stacking of the low-temperature heat accumulators 3-3 on the cold air chamber airflow distribution annular wall body, and is communicated with the cold air chamber airflow distribution loop 4-4 at the outermost layer.
In order to ensure the use effect, the wall body 1 of the premixing chamber and the wall body 2 of the heat accumulation combustion chamber are built by refractory materials with high temperature resistance, low deformation and excellent thermal shock resistance in metal shells, and are respectively a heavy material, a light material and an outer layer of high temperature resistant light cotton felt from inside to outside.
The wall body 3 of the regenerator is built by high-temperature resistant and low-deformation refractory materials in a metal shell, and the high-temperature resistant and low-deformation refractory materials comprise heavy materials, light materials and outer-layer high-temperature resistant light cotton felts from inside to outside.
The wall structure of the wall body 4 of the cold air chamber is the same as that of the wall body of the regenerative chamber, the furnace bottom 5 is formed by pouring heat-resistant concrete in a metal shell, the airflow distribution annular wall 4-3 of the cold air chamber is built on the furnace bottom 5, cold air inlet nozzles 4-5 which are circumferentially distributed on the furnace bottom are arranged in a horizontal inclined direction, and the inclined angle of the cold air inlet nozzles is controlled within 60 degrees.
The high-temperature heat accumulator 2-2, the medium-temperature heat accumulator 3-2 and the low-temperature heat accumulator 3-3 are all regular stacking structures of various formed porous blocks, and comprise a honeycomb block combination consisting of regularly arranged ventilation pipe holes or a stacked body of various stacked porous media, wherein the temperature resistance degree of the material is determined by the position of the material, and the high-temperature heat accumulator 2-2 consists of various identical high-temperature-resistant and high-temperature-adhesion-resistant ceramic materials.
The hot air outlet pipes 1-6 are vertically arranged on the cylindrical wall body of the premixing chamber wall body 1.
The coal gas cyclone inlet pipe 1-2 and the air cyclone inlet pipe 1-3 are internally provided with a coal gas cyclone guide plate 1-2a and an air cyclone guide plate 1-3a respectively, the coal gas cyclone inlet pipe 1-2 and the air cyclone inlet pipe 1-3 are communicated with a premixing chamber 1-1, the communicated parts are horizontally inclined and contracted to form a coal gas cyclone spray port 1-2b and an air cyclone spray port 1-3b respectively, the inclination angle is controlled within 60 degrees, and the coal gas cyclone inlet pipe 1-2 and the air cyclone inlet pipe 1-3 are made (built) of high-temperature-resistant and thermal shock-resistant refractory materials in a metal shell.
The air flow adjusting air inlet pipe 1-7 is vertically communicated with the premixing chamber 1-1 downwards and is provided with a gradually contracted outlet, and the outlet is made of a high-temperature-resistant thermal shock-resistant refractory material.
The cold air inlet pipes 4-2 and the flue gas outlet pipes 4-6 are symmetrically arranged on the wall body 4 of the cold air chamber along the circumferential direction, are horizontally inclined and communicated with the cold air chamber 4-1, and are controlled within 60 degrees, and the inclination directions of the horizontal inclination angles are consistent with those of the cold air inlet nozzles 4-5 on the air flow distribution annular wall 4-3 of the cold air chamber.
The cylindrical wall body of the premixing chamber 1-1 is built on a premixing chamber bearing ring 1-5 connected with the furnace shell, and the lower part of the cylindrical wall body of the heat accumulation combustion chamber wall body 2 is built on a heat accumulation combustion chamber bearing ring 2-5 connected with the furnace shell.
When the hot blast stove with the structure is concretely implemented, coal gas and air respectively enter the premixing chamber 1-1 through the coal gas cyclone air inlet pipe 1-2 and the air cyclone air inlet pipe 1-3 which are symmetrically arranged for carrying out high-speed opposite-flushing cyclone mixing, meet the adjusting air flow (the adjusting air flow can be rich in oxygen, air, coal gas and the like) sprayed from the air flow adjusting air inlet pipe 1-7 at the moment and continuously and fully mix with each other again, then form high-speed cyclone downward premixed air flow to enter the backflow combustion-supporting high-temperature heat accumulator 2-2 in the heat accumulation chamber 2-1, because of the combined action of the inlet air flow adjusting channel 2-4 and the central air flow guide block 2-4, the high-speed downward air flow forms a strong backflow cyclone field in the combustion-supporting high-temperature heat accumulator 2-2, and the combustion process in the heat accumulator forms a self-reinforced uniform distributed 'enthalpy over-combustion state', the temperature of the heat accumulator and the temperature of the combustion gas flow exceed the theoretical combustion temperature, so that the high temperature of the upper heat accumulator is formed, and conditions are created for conveying high-temperature hot blast for the hot blast stove; then the high-temperature flue gas enters the middle-temperature heat accumulator 3-2 and the low-temperature heat accumulator 3-3 in the heat accumulator 3-1 in sequence, enters the cold air chamber air flow distribution loop 4-4 through the cold air chamber heat accumulator porous bearing plate 4-7 after the heat transfer between the combustion flue gas and the heat accumulator is completed, and finally enters the flue gas outlet pipe 4-6 to be discharged out of the hot blast stove after the air flow is converged through the cold air inlet nozzle 4-5, thereby completing the heating process of the hot blast stove heat accumulator. After the heat accumulator stores heat fully, the combustion process is closed and the air supply process is started, namely the heating process of high-pressure air supply and the cooling process of the heat accumulator. At the moment, cold air enters the cold air chamber air flow distribution loop 4-4 from the cold air inlet pipe 4-2 and is subjected to air flow distribution through the cold air inlet nozzle 4-5 to form uniform upward air flow, the uniform upward air flow sequentially enters the low-temperature heat accumulator 3-3, the medium-temperature heat accumulator 3-2 and the combustion-supporting high-temperature heat accumulator 2-2 through the cold air chamber heat accumulator porous bearing plate 4-7, the temperature is gradually increased in the heat exchange process with each layer of heat accumulator, and finally the upward air flow enters the hot air outlet pipe 1-6 in the middle of the premixing chamber 1-1 to be led out, so that the hot air furnace finishes the process of. Continuous hot blast is provided for a blast furnace or other heat utilization equipment in the alternative switching process of a plurality of same hot blast stoves.
Compared with the prior art, the hot blast stove of the invention has the following advantages: 1) the high-speed symmetrical and uniform strong vortex full premixing of coal gas and air and the adjustment and control of the adjustment air flow are adopted, the controllable premixed combustion of high-temperature and high-strength backflow vortex in a heat accumulator is realized to the greatest extent, and the control of the generation of nitrogen oxide in the high-temperature combustion process is effectively realized; 2) the miniaturization of the premixing chamber strengthens the mutual mixing of air and gas and improves the flow velocity of air flow, so that the combustion process is more concentrated in the heat storage chamber, the combustion and heat transfer in the heat storage body are strengthened, and the temperature of the heat storage body is effectively improved; 3) the air and the coal gas are guided and turned to be connected into the premixing chamber, so that the rotational flow strength is effectively enhanced, the air inlet pipe is protected at low temperature in an air supply stage, and the stability and the safety of the structure are improved; 4) the combustion airflow diversion block arranged on the combustion-supporting high-temperature heat accumulator greatly changes the airflow distribution in the combustion-supporting high-temperature heat accumulator, and the formed strong backflow vortex flow structure can promote the occurrence of an over-enthalpy combustion phenomenon in the combustion process, thereby being beneficial to improving the temperature of the heat accumulator; 5) adopt the multi-ring channel flow field distribution adjusting device in the cold air chamber, be favorable to realizing that the flow field between combustion air current and the air supply air current matches and cooperatees unanimously, effectively improve the utilization ratio and the intensive heat transfer process of heat accumulator, because this hot-blast furnace can obtain higher stable hot-blast temperature under the same coal gas calorific value than traditional hot-blast furnace, and the reduction of the nitrogen oxide that arrives of high strength premix burning, and save the manufacturing cost (saving 10% ~ 15%) that the vast majority of combustion chamber space and the unnecessary space of utilization cold air chamber of saving traditional hot-blast furnace brought, therefore can be said to be a high efficiency, high temperature, energy-conserving and environmental protection's hot-blast furnace, its economic benefits and social that use are very showing.
Claims (10)
1. A hot blast stove with high-speed hedging rotational flow adjustable premix heat accumulator backflow high-temperature combustion is integrally formed by building a closed wall body built by refractory materials in a metal shell, and is characterized in that a premix chamber wall body (1), a heat accumulation combustion chamber wall body (2), a heat accumulation chamber wall body (3) and a cold air chamber wall body (4) are sequentially arranged in the shell from top to bottom, and the internal spaces of the premix chamber wall body, the heat accumulation combustion chamber wall body (2-1), the heat accumulation combustion chamber (3-1), the medium-temperature heat accumulator (3-2) and the low-temperature heat accumulator (3-3) are respectively a premix chamber (1-1) for providing mixed combustion of coal gas and air, the heat accumulation combustion chamber (2-2) for stacking backflow high-temperature combustion-supporting heat accumulators (2-2), and the cold air chamber (4-1) for; the premixing chamber (1-1) is a space with an opening at the lower part, the space is composed of a hemispherical wall body of the wall body (1) of the premixing chamber and a cylindrical wall body, an air flow adjusting air inlet pipe (1-7) is arranged at the top of the hemispherical wall body of the wall body (1) of the premixing chamber, a gas rotational flow inlet pipe (1-2) and an air rotational flow inlet pipe (1-3) are symmetrically arranged on the cylindrical wall body along the circumferential direction, a hot air outlet pipe (1-6) communicated with the premixing chamber (1-1) is arranged on the cylindrical wall body of the wall body (1) of the premixing chamber, the opening at the lower part of the premixing chamber (1-1) is a premixing chamber outlet (1-4) and communicated with a heat accumulation combustion chamber (2-1) below the premixing chamber, the heat accumulation combustion chamber (2-1) is a space formed by combining an ellipsoidal wall body and a cylindrical wall body of the heat accumulation combustion, an inlet airflow adjusting channel (2-4) communicated with an outlet (1-4) of the premixing chamber is arranged at the top of the heat accumulation combustion chamber wall body (2), the structure of the heat accumulation combustion chamber wall body is a cylindrical channel which is gradually enlarged, a frustum-shaped central airflow guide block (2-3) supported by the top of the combustion-supporting high-temperature heat accumulator (2-2) is arranged at the center of the heat accumulation chamber wall body, the heat accumulation chamber (3-1) is a space surrounded by the cylindrical heat accumulation chamber wall body (3), the upper inner layer wall body of the heat accumulation chamber wall body (3) is directly inserted into the cylindrical section of the heat accumulation combustion chamber wall body (2) and adopts a slidable sealing connection mode with the heat accumulation chamber wall body, the lower part wall body is connected with the cold air chamber wall body (4) into a whole, and the medium-temperature heat accumulator (3-2) and the low-temperature heat accumulator (3-3) are stacked in the; the cold air chamber (4-1) is of a cylindrical cup-shaped structure consisting of a cylindrical cold air chamber wall body (4) and a disc-shaped furnace bottom (5), a concentric multi-ring cold air chamber airflow distribution annular wall (4-3) is built at the bottom of the cold air chamber airflow distribution annular wall, cold air chamber airflow distribution annular channels (4-4) are formed among the cold air chamber airflow distribution annular walls (4-3) and between the cold air chamber airflow distribution annular walls and the cold air chamber wall body (4), cold air inlet nozzles (4-5) which are arranged in a multi-layer mode are arranged on the cold air chamber airflow distribution annular wall (4-3) along the circumferential direction and used for communicating the cold air chamber airflow distribution annular channels (4-4) and the central part of the cold air chamber (4-1), block-shaped heat accumulator porous bearing plates (4-7) are laid on the top of the cold air chamber airflow distribution annular wall (4-3) from inside to outside along the annular channels so as to facilitate the building of low, the cold air inlet pipe (4-2) and the flue gas outlet pipe (4-6) are arranged on the wall body (4) of the cold air chamber and are communicated with the cold air chamber airflow distribution loop (4-4) on the outermost layer.
2. The high-speed hedging rotational flow adjustable premixing heat accumulator reflux high-temperature combustion hot blast stove according to claim 1, characterized in that the premixing chamber wall (1) and the heat accumulation combustion chamber wall (2) are built by refractory materials with excellent high-temperature resistance, low deformation and thermal shock resistance in a metal shell, and are respectively heavy materials and light materials from inside to outside and outer layer high-temperature resistant light cotton felt.
3. The high-speed hedging rotational flow adjustable premix heat accumulator backflow high-temperature combustion hot blast stove according to claim 1, characterized in that the regenerator wall (3) is built by high-temperature resistant and low-deformation refractory materials in a metal shell, and is respectively a heavy material and a light material from inside to outside, and an outer layer of high-temperature resistant light cotton felt.
4. The high-speed hedging rotational flow adjustable premix heat accumulator backflow high-temperature combustion hot blast stove according to claim 1, characterized in that the wall structure of the cold air chamber wall (4) is the same as that of the heat accumulator, the bottom (5) of the stove is formed by pouring heat-resistant concrete in a metal shell, a cold air chamber air flow distribution annular wall (4-3) is built on the bottom (5), cold air inlet nozzles (4-5) circumferentially distributed on the cold air chamber air flow distribution annular wall are arranged in a horizontal inclined direction, and the inclination angle of the cold air inlet nozzles is controlled within 60 degrees.
5. The high-speed hedging rotational flow adjustable premix heat accumulator backflow high-temperature combustion hot blast stove according to claim 1, characterized in that the backflow combustion-supporting high-temperature heat accumulator (2-2), the medium-temperature heat accumulator (3-2) and the low-temperature heat accumulator (3-3) are all regular stacking structures of various formed porous blocks, and comprise a combination of honeycomb blocks consisting of regularly arranged ventilation pipe holes or stacks of various porous media, the temperature resistance degree of the material is determined by the positions of the honeycomb blocks, and the backflow combustion-supporting high-temperature heat accumulator (2-2) is made of ceramic materials which are resistant to high temperature and resistant to high-temperature adhesion and have the same properties.
6. The high-speed hedging swirl adjustable premix heat accumulator backflow high-temperature combustion hot blast stove according to claim 1, characterized in that the hot blast outlet pipe (1-6) is vertically arranged on a cylindrical wall of the premix chamber wall (1).
7. The high-speed hedging swirl adjustable premix heat accumulator backflow high-temperature combustion hot blast stove according to claim 1, the coal gas cyclone dust collector is characterized in that a coal gas cyclone guide plate (1-2a) and an air cyclone guide plate (1-3a) are respectively arranged in a coal gas cyclone inlet pipe (1-2) and an air cyclone inlet pipe (1-3), the coal gas cyclone inlet pipe (1-2) and the air cyclone inlet pipe (1-3) are communicated with a premixing chamber (1-1), the communicated parts are horizontally inclined and contracted to form a coal gas cyclone jet port (1-2b) and an air cyclone jet port (1-3b), the inclination angle is controlled within 60 degrees, and the coal gas cyclone inlet pipe (1-2) and the air cyclone inlet pipe (1-3) are made of high-temperature-resistant and thermal shock-resistant refractory materials in metal shells.
8. The high-speed hedging cyclone adjustable premix heat accumulator backflow high-temperature combustion hot blast stove according to claim 1, characterized in that the air flow adjusting inlet pipe (1-7) is vertically and downwards communicated with the premix chamber (1-1) and is provided with a gradually contracted outlet which is made of a high-temperature resistant and thermal shock resistant refractory material.
9. The high-speed hedging rotational flow adjustable premixing heat accumulator backflow high-temperature combustion hot blast stove according to claim 1, characterized in that the cold air inlet pipe (4-2) and the flue gas outlet pipe (4-6) are symmetrically arranged on the wall body (4) of the cold air chamber along the circumferential direction, and are horizontally inclined and communicated with the cold air chamber (4-1), and the horizontal inclination angle is controlled within 60 degrees and is consistent with the inclination direction of the cold air inlet nozzle (4-5) on the air flow distribution annular wall (4-3) of the cold air chamber.
10. The high-speed hedging cyclone adjustable premixed heat accumulator backflow high-temperature combustion hot blast stove according to claim 1, characterized in that the cylindrical wall body of the premixing chamber (1-1) is built on a premixing chamber supporting ring (1-5) connected with the stove shell, and the lower part of the cylindrical wall body of the regenerative combustion chamber wall body (2) is built on a regenerative combustion chamber supporting ring (2-5) connected with the stove shell.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010675714.8A CN111795499A (en) | 2020-07-14 | 2020-07-14 | Hot blast stove with high-speed hedging rotational flow adjustable premixing heat accumulator backflow high-temperature combustion |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010675714.8A CN111795499A (en) | 2020-07-14 | 2020-07-14 | Hot blast stove with high-speed hedging rotational flow adjustable premixing heat accumulator backflow high-temperature combustion |
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| CN111795499A true CN111795499A (en) | 2020-10-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010675714.8A Withdrawn CN111795499A (en) | 2020-07-14 | 2020-07-14 | Hot blast stove with high-speed hedging rotational flow adjustable premixing heat accumulator backflow high-temperature combustion |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3477701A (en) * | 1966-04-16 | 1969-11-11 | Nippon Kokan Kk | Hot-blast stoves |
| CN201770720U (en) * | 2010-07-22 | 2011-03-23 | 郑州豫兴耐火材料有限公司 | Hedging cyclone heat storage medium central-combustion high blast temperature hot blast stove |
| CN203569130U (en) * | 2013-11-25 | 2014-04-30 | 陈维汉 | Cyclone inner mixing rectifying upper spraying backflow heat accumulator combustion hot blast stove |
| CN105650624A (en) * | 2016-02-01 | 2016-06-08 | 陈维汉 | Hot-blast stove for classification premixed combustion and flow equalizing heat transfer of gas and air |
| CN111189222A (en) * | 2020-03-11 | 2020-05-22 | 郑州釜鼎热能技术有限公司 | High-temperature low-nitrogen combustion hot blast stove in high-speed hedging rotational flow premixing heat accumulator |
-
2020
- 2020-07-14 CN CN202010675714.8A patent/CN111795499A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3477701A (en) * | 1966-04-16 | 1969-11-11 | Nippon Kokan Kk | Hot-blast stoves |
| CN201770720U (en) * | 2010-07-22 | 2011-03-23 | 郑州豫兴耐火材料有限公司 | Hedging cyclone heat storage medium central-combustion high blast temperature hot blast stove |
| CN203569130U (en) * | 2013-11-25 | 2014-04-30 | 陈维汉 | Cyclone inner mixing rectifying upper spraying backflow heat accumulator combustion hot blast stove |
| CN105650624A (en) * | 2016-02-01 | 2016-06-08 | 陈维汉 | Hot-blast stove for classification premixed combustion and flow equalizing heat transfer of gas and air |
| CN111189222A (en) * | 2020-03-11 | 2020-05-22 | 郑州釜鼎热能技术有限公司 | High-temperature low-nitrogen combustion hot blast stove in high-speed hedging rotational flow premixing heat accumulator |
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