CN219494873U - Low oxygen-enriched air heat accumulation steady-state combustion double-smoke-discharging heating furnace device - Google Patents
Low oxygen-enriched air heat accumulation steady-state combustion double-smoke-discharging heating furnace device Download PDFInfo
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- CN219494873U CN219494873U CN202320372164.1U CN202320372164U CN219494873U CN 219494873 U CN219494873 U CN 219494873U CN 202320372164 U CN202320372164 U CN 202320372164U CN 219494873 U CN219494873 U CN 219494873U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The utility model discloses a low oxygen-enriched air heat accumulation steady-state combustion double-smoke-discharging heating furnace device, which comprises: the hearth of the heating furnace is divided into a preheating section, a heating section and a soaking section, the heating section and the soaking section are respectively provided with a burner and a side smoke outlet, and the preheating section is provided with a tail smoke outlet; the waste heat recovery mechanism is characterized in that a hot flow inlet end of the waste heat recovery mechanism is communicated with a tail smoke outlet, a cold flow inlet end of the waste heat recovery mechanism is communicated with a low heat value gas supply end, and a cold flow outlet end of the waste heat recovery mechanism is used for respectively supplying preheated gas to a burner; at least two groups of air heat storages, each group of air heat storages at least comprises two air heat storages, the air outlet end of each air heat storage is used for alternately supplying the low oxygen-enriched air after heat storage to the burner tip, and the air inlet end is communicated with a low oxygen-enriched air source; the side smoke outlets are respectively communicated with the smoke inlet ends of the corresponding air heat accumulators. The utility model has the beneficial effects of continuously supplying high-temperature coal gas and air to the burner tip, realizing continuous combustion and efficiently recovering waste heat.
Description
Technical Field
The utility model relates to the technical field of energy conservation and emission reduction of a regenerative heating furnace. More particularly, the utility model relates to a low oxygen-enriched air heat accumulation steady-state combustion double-smoke-discharging heating furnace device.
Background
The production process of iron and steel enterprises can generate a large amount of low-heat-value gas, such as blast furnace gas and converter gas, and the steel rolling process just needs a large amount of gas to provide high-temperature heat energy when heating billets. However, the combustion temperature of the low-heat-value gas cannot meet the basic requirement of the furnace temperature of the steel rolling heating furnace on the combustion temperature in a conventional combustion mode, so that the combustion temperature of the low-heat-value gas is improved by adopting an air and gas double heat-storage combustion mode in steel enterprises, and the application of the double heat-storage technology ensures that the low-heat-value gas meets the basic requirement of the steel billet heating process in the steel rolling process. At present, the steel rolling process of the iron and steel enterprises basically adopts the low-heat value gas double-heat-storage heating furnace system.
However, the existing low-calorific-value gas double-heat-accumulation heating furnace technology has serious technical defects, because in the process design of the double-heat-accumulation heating furnace, the problem that the combustion reversing is needed in the gas burner exists, when the combustion side heat-accumulation gas burner is switched from the combustion state to the smoke discharging state, a pipe of gas remains in a pipeline between the side gas reversing valve and the heat accumulator, and the pipe of gas reversely flows to follow the soot to be discharged into the atmosphere, so that the following four serious adverse effects are caused:
1) When the gas burner is switched every time, a large amount of toxic gas is discharged into the atmosphere, so that very serious toxic and harmful CO gas is discharged in a technological way, and the ecological environment is seriously polluted.
2) The sealing structure of the gas three-way valve for controlling the combustion switching action is often damaged, so that a large amount of gas is leaked into the soot, thereby causing very serious toxic and harmful CO gas structural emission and seriously polluting the ecological environment.
3) The large amount of the manufacturability and the structural diffusion of the coal gas cause serious waste of high-quality coal gas energy and cause a large amount of extra emission of greenhouse gases.
4) The gas three-way valve is not tightly sealed, so that the CO concentration in a furnace area is always out of standard, and the labor safety environment of steel rolling heating furnace operators is poor.
It is estimated that the heat accumulating type steel rolling heating furnace in China wastes about 120 hundred million standard formulas of high-quality low-heat value gas each year, emits about 33 hundred million standard formulas of toxic and harmful gas CO, and has serious environmental pollution and energy waste. The above problems have not been solved for a long time, and become a technical bottleneck for restricting green low carbonization in the steel rolling process.
Disclosure of Invention
It is an object of the present utility model to solve at least the above problems and to provide at least the advantages to be described later.
To achieve these objects and other advantages and in accordance with the purpose of the utility model, there is provided a low oxygen enriched air regenerative steady combustion double smoke exhaust heating furnace device comprising:
the heating furnace comprises a hearth, a preheating section, a heating section and a soaking section, wherein the heating section and the soaking section are respectively provided with a burner and a side smoke outlet far away from the burner;
the cold flow outlet end of the waste heat recovery mechanism is used for respectively supplying preheated coal gas to the burner tip through a pipeline;
the air outlet ends of the air heat storages alternately supply the low oxygen-enriched air after heat storage to the burner through pipelines, and the air inlet ends of the air heat storages are communicated with a pressurized low oxygen-enriched air source through pipelines;
the side smoke outlets on the heating section and the soaking section are respectively communicated with the smoke inlet ends of the corresponding air heat storages through pipelines, and the side smoke outlets alternately supply smoke to the air heat storages in the same group;
the flue gas inlet end of the flue gas purifying mechanism is communicated with the hot flow outlet end of the waste heat recovery mechanism through a pipeline, and is communicated with the flue gas outlet end of the air heat accumulator through a pipeline;
wherein, all be equipped with the valve on the pipeline.
Preferably, the waste heat recovery mechanism includes:
the heat flow inlet end of the waste heat exchanger is communicated with the tail smoke outlet through a pipeline, and a valve is arranged on the pipeline;
the hot flow inlet end of the high-temperature gas preheater is communicated with the hot flow outlet end of the waste heat exchanger through a pipeline, and the cold flow outlet end of the high-temperature gas preheater supplies preheated gas to the burner through a pipeline;
the cold flow inlet end of the air-smoke GGH heat exchanger is communicated with the smoke outlet end of the air heat accumulator through a pipeline;
the gas inlet end of the mixer is respectively communicated with the cold flow outlet end of the air-flue GGH heat exchanger and the hot flow outlet end of the high-temperature gas preheater through pipelines, wherein the gas outlet end of the mixer is communicated with the gas inlet end of the flue gas purifying mechanism through pipelines;
the gas outlet end of the flue gas purifying mechanism is communicated with the heat flow inlet end of the air-flue GGH heat exchanger through a pipeline;
the cold flow inlet end of the low-temperature gas preheater is communicated with the cold flow inlet end of the high-temperature gas preheater through a pipeline, and valves are arranged on the pipeline.
Preferably, the method further comprises:
the air inlet end of the smoke mixing induced draft fan is communicated with the hot flow outlet end of the low-temperature gas preheater through a pipeline;
and the smoke inlet end of the chimney is communicated with the air outlet end of the smoke mixing induced draft fan through a pipeline, and valves are arranged on the pipeline.
Preferably, the flue gas purifying mechanism is a mixed flue gas SCR denitration tower.
Preferably, the flue gas purifying mechanism further comprises a dust removing structure and a desulfurizing structure;
the gas outlet end of the mixer is communicated with the pipeline between the gas inlet end of the mixed smoke SCR denitration tower in sequence, and the dust removing structure and the desulfurization structure are arranged on the pipeline.
Preferably, the dust removing structure is a bag-type dust remover, and the desulfurization structure is a dry desulfurization device.
Preferably, the air conditioner further comprises a blower, wherein the air inlet end of the blower is communicated with a low oxygen-enriched air source through a pipeline, the air outlet end of the blower is communicated with the air heat accumulator through a pipeline, and valves are arranged on the pipelines.
Preferably, the heating section and the burner on the soaking section are both a pair, and are arranged oppositely at the position where the billet is placed.
The utility model at least comprises the following beneficial effects:
firstly, the heat accumulation and reversing of the gas are canceled, and the technical problems of high-quality gas waste and serious CO environmental pollution caused by the manufacturability and structural gas release of the existing low-heat value gas heat accumulation type steel rolling heating furnace are thoroughly solved.
Secondly, the heat accumulation and reversing of the gas are canceled, and the technical problem that the existing low-heat value gas heat accumulation type steel rolling heating furnace has a severe environment is thoroughly solved.
Thirdly, the mixed technology of low-temperature air smoke and higher-temperature soot is adopted to meet the denitration reaction temperature, so that the consumption of post-combustion gas of a denitration tower is avoided, and meanwhile, the energy waste caused by a large amount of diffused gas is eliminated, so that the CO in the steel rolling process is fundamentally reduced 2 The emission level is an obvious low-calorific-value gas low-carbon combustion method.
Fourthly, a gas heat storage reversing system is omitted, so that the accident rate of the heating furnace is greatly reduced, and the maintenance workload and the maintenance cost of the heating furnace are greatly reduced.
Fifthly, the discontinuous combustion mode is replaced by the continuous combustion mode, the heating furnace can realize a more accurate intelligent heating process, and meanwhile, the heating intensity is increased and the oxidation rate is reduced.
Sixth, carry on four-stage recovery to the waste heat of the soot, the first-stage waste heat recovery: and preheating the steel billet entering the furnace by utilizing the high-temperature waste heat of the soot, and completing the heat exchange process in a preheating section of the hearth. Second-stage waste heat recovery: and heating working medium water or saturated steam in a waste heat boiler by utilizing part of waste heat with higher temperature in the medium temperature waste heat of the soot to produce hot water or superheated steam. Third-stage waste heat recovery: and raising the temperature of the coal gas from the low-temperature coal gas preheater to above 350 ℃ in the high-temperature coal gas preheater by utilizing part of the waste heat with lower temperature in the medium-temperature waste heat of the coal gas. Fourth-stage waste heat recovery: and preheating the low-temperature coal gas by utilizing the low-temperature waste heat of the coal smoke.
Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model.
Drawings
Fig. 1 is a schematic diagram of pipe connection of the double-exhaust heating furnace device according to one embodiment of the present utility model.
Detailed Description
The present utility model is described in further detail below with reference to the drawings to enable those skilled in the art to practice the utility model by referring to the description.
It should be noted that the experimental methods described in the following embodiments, unless otherwise specified, are all conventional methods, and the reagents and materials, unless otherwise specified, are all commercially available; in the description of the present utility model, the orientation or positional relationship indicated by the terms are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.
As shown in fig. 1, the reference numerals are explained as follows: the heating furnace 1, the preheating section 11, the heating section 12, the soaking section 13, the burner 14, the side smoke outlet 15, the tail smoke outlet 16, the air heat accumulator 2, the smoke purifying mechanism 3, the waste heat recovery mechanism 100, the waste heat exchanger 4, the high-temperature gas preheater 5, the air smoke GGH heat exchanger 6, the mixer 7, the low-temperature gas preheater 8, the smoke mixing induced draft fan 9, the chimney 10 and the blower 17.
As shown in fig. 1, the utility model provides a low oxygen-enriched air heat accumulation steady-state combustion double-smoke-discharging heating furnace device, which comprises:
the heating furnace 1 comprises a preheating section 11, a heating section 12 and a soaking section 13, wherein the heating section 12 and the soaking section 13 are respectively provided with a burner 14 and a side smoke outlet 15 far away from the burner 14, and the preheating section 11 is provided with a tail smoke outlet 16; the hearth of the heating furnace 1 is divided into three heating sections according to different hearth temperature levels, the three heating sections are sequentially provided with a preheating section 11, a heating section 12 and a soaking section 13 according to the sequence of steel billet entering the furnace, the two pairs of burner tips 14 (single heat accumulating low heat value gas burner tips 14) are preferably arranged, each pair of burner tips 14 are symmetrically arranged on two sides of the heating section 12 and the soaking section 13 and are positioned on two sides of the steel billet placing position, and the preheating section 11 is not provided with the burner tips 14.
The billet enters the hearth of the heating furnace 1 from the inlet end of the preheating section 11, then sequentially passes through the preheating section 11, the heating section 12 and the soaking section 13, and leaves the hearth of the heating furnace 1 from the outlet end of the soaking section 13 after the billet heating temperature reaches the requirement. The heating section 12 is used for rapidly heating the steel billet by using the high-temperature smoke heat generated by fuel combustion, and the soaking section 13 is used for soaking the steel billet by using the high-temperature smoke heat generated by fuel, so that the temperature difference of the section of the steel billet is reduced. The preheating section 11 is used for preheating the steel billet by utilizing the high-temperature section waste heat of the high-temperature flue gas leaving the heating section 12, so that the high-efficiency recovery of the high-temperature flue gas waste heat is realized. The method for recovering the waste heat of the high-temperature flue gas in the preheating section 11 will be described in detail later.
The hot flow inlet end of the waste heat recovery mechanism 100 is communicated with the tail smoke outlet 16 through a pipeline, the cold flow inlet end of the waste heat recovery mechanism 100 is communicated with the low heat value gas supply end through a pipeline, and the cold flow outlet end of the waste heat recovery mechanism 100 supplies preheated gas to the burner tip 14 through a pipeline respectively; the waste heat recovery mechanism 100 may be configured to perform multi-stage recovery according to temperature requirements, and the waste heat recovery mechanism 100 is typically implemented using a heat exchanger. For example, the method is divided into four stages of recovery, wherein the first stage is to release heat to a billet in a preheating section 11 of a hearth, so that waste heat recovery is realized; the second stage can be provided with a boiler waste heat exchanger 4 which is connected with a tail smoke outlet 16, so that part of waste heat is recovered for heating boiler water or processing medium; the third stage and the fourth stage are used for heating the low-heat-value gas by a high-temperature heat exchanger and a low-temperature heat exchanger in a heating and grading way, so that the low-heat-value gas is heated to a proper temperature and then is sent into the burner tip 14 for combustion, and the low-heat-value gas is generally heated to about 350 ℃. The waste heat of the discharged soot can be sufficiently recovered by the waste heat recovery mechanism 100, and the utilization rate can be significantly improved.
The combustion products generated after the gas combustion emit heat to the steel billet to form high-temperature flue gas, the high-temperature flue gas is discharged from the tail smoke outlet 16 positioned at the preheating section 11 of the hearth, and in the process of discharging the high-temperature flue gas to the tail smoke outlet 16, the high-temperature flue gas emits heat to the hearth and the steel billet of the preheating section 11, so that the waste heat is fully utilized. The high temperature flue gas discharged from the furnace through the tail flue gas outlet 16 is called as soot, and the waste heat of the high temperature section of the soot is recovered in the preheating section 11 of the furnace, which is the first stage waste heat recovery.
At least two groups of air heat storages 2, the two groups of air heat storages 2 respectively correspond to the heating section 12 and the soaking section 13, each group of air heat storages 2 at least comprises two air heat storages 2, the air outlet ends of the air heat storages 2 alternately supply the low oxygen enriched air after heat storage to the burner tip 14 through pipelines, and the air inlet ends of the air heat storages 2 are communicated with a pressurized low oxygen enriched air source through pipelines; the low oxygen-enriched air can be conveyed by a blower 17 under pressure. The air inlet end of the blower 17 is communicated with a low oxygen-enriched air source through a pipeline, and the air outlet end is communicated with the air heat accumulator 2 through a pipeline.
The side smoke outlets 15 on the heating section 12 and the soaking section 13 are respectively communicated with the smoke inlet ends of the corresponding air heat storages 2 through pipelines, and the side smoke outlets 15 alternately supply smoke to the air heat storages 2 in the same group;
the flue gas inlet end of the flue gas purifying mechanism 3 is communicated with the hot flow outlet end of the waste heat recovery mechanism 100 through a pipeline and is communicated with the flue gas outlet end of the air heat accumulator 2 through a pipeline;
wherein, all be equipped with the valve on the pipeline.
The burner 14 is arranged on one side of the two sides of the hearth heating section 12 and the soaking section 13 of the heating furnace 1, and then an air heat accumulator group can be arranged on the other side. After being pressurized by the blower 17, the low-oxygen-enriched air alternately flows through the air heat accumulator 2, is preheated to 300-1000 ℃ by the heat accumulator in the air heat accumulator 2, and is conveyed to the burner 14 at the other side of the hearth through a pipeline to continuously support combustion for the heated gas combustion.
The method for alternately switching the heat storage comprises the following steps: the high temperature flue gas formed by the heat released by the combustion products of the gas combustion to the billet is discharged from the side smoke outlet 15 positioned on the opposite side of the burner 14 to the hearth, the high temperature flue gas is called empty flue gas, the air flue gas leaves the hearth and alternately enters the air heat accumulator 2 to heat the heat accumulator body alternately, the number of the air heat accumulator 2 is generally more than 2, and the low oxygen-enriched air and the empty flue gas alternately flow in countercurrent in a staggered way, for example: at a certain moment, when the air smoke flows through the air heat accumulator 2A, the low-oxygen-enriched air flows through the air heat accumulator 2B in a countercurrent manner, the air smoke and the low-oxygen-enriched air are switched at the next moment, and when the air smoke flows through the air heat accumulator 2B and the air heat accumulator 2A respectively, the air smoke releases heat to the heat accumulator of the air heat accumulator 2, the heat accumulator heats up, the process is called a heat cycle of the air heat accumulator 2, and when the low-oxygen-enriched air flows through the air heat accumulator 2, the heat accumulator heats the low-oxygen-enriched air. The heat storage body is cooled down, a process called a cold cycle of the air heat storage 2. The air smoke releases heat in the air heat accumulator 2 to form low-temperature air smoke with the temperature of 100-150 ℃, and the low-temperature air smoke enters the smoke purifying mechanism 3 for purification treatment. For a clearer presentation of the soot flow, the following is shown in flow form:
air smoke (high-temperature smoke formed by heat release of combustion products of gas combustion to steel billets), an air heat accumulator 2 (heat release), low-temperature air smoke, a smoke purifying mechanism 3 and emission;
low oxygen-enriched air (oxygen content about 25%) →air regenerator 2 (endothermic) →furnace (heating section 12, soaking section 13 for combustion supporting);
from the above process, it can be seen that the low oxygen-enriched air of iron and steel enterprises is obtained after absorbing heat based on the air heat accumulator 2, and the low oxygen-enriched air of 300-1000 ℃ meets the combustion requirement. The waste heat of the discharged high-temperature air smoke is fully utilized.
In the above technical scheme, the low oxygen-enriched air is preheated to 300-1000 ℃ by the air heat accumulator 2, then is continuously supplied to the burner 14, the low heat value gas is preheated to about 350 ℃ by the waste heat exchanger 4, then is continuously supplied to the burner 14, and enters the hearth for diffusion combustion under the combustion supporting of the low oxygen-enriched air, and is continuously combusted, the combustion products continuously release heat to the billet, and the formed high temperature flue gas is continuously discharged from the side smoke outlet 15. The single heat storage mode is used for replacing the double heat storage mode, so that the defect caused by reversing the burner tip 14 in the double heat storage mode in the prior art is overcome, namely, a residual pipe of gas in a pipeline between a gas reversing valve and a heat accumulator is not generated, the gas is combusted in a hearth, and generated empty smoke (high-temperature smoke) is recycled (used for heating the air heat accumulator 2) and is discharged after being treated by the smoke purifying mechanism 3. Therefore, the three-way valve of the gas is not damaged, the gas waste is not caused, the toxic and harmful CO gas is not discharged in a technological way, and the environmental pollution is not caused.
In another aspect, the waste heat recovery mechanism 100 includes:
the heat flow inlet end of the waste heat exchanger 4 is communicated with the tail smoke outlet 16 through a pipeline, and a valve is arranged on the pipeline; the high-temperature flue gas discharged from the hearth through the tail flue gas outlet 16 is called as soot, and the waste heat of the soot is recovered by adopting an indirect heat exchange mode of the waste heat exchanger 4 and is used for heating working medium water of a boiler.
The hot flow inlet end of the high-temperature gas preheater 5 is communicated with the hot flow outlet end of the waste heat exchanger 4 through a pipeline, and the cold flow outlet end of the high-temperature gas preheater 5 supplies preheated gas to the burner tip 14 through a pipeline;
the cold flow inlet end of the air-smoke GGH heat exchanger 6 is communicated with the smoke outlet end of the air heat accumulator 2 through a pipeline;
the gas inlet end of the mixer 7 is respectively communicated with the cold flow outlet end of the air-flue GGH heat exchanger 6 and the hot flow outlet end of the high-temperature gas preheater 5 through pipelines, wherein the gas outlet end of the mixer 7 is communicated with the gas inlet end of the flue gas purifying mechanism 3 through pipelines;
the gas outlet end of the flue gas purifying mechanism 3 is communicated with the hot flow inlet end of the air-flue GGH heat exchanger 6 through a pipeline;
the cold flow inlet end of the low-temperature gas preheater 8 is communicated with the hot flow outlet end of the empty smoke GGH heat exchanger 6 through a pipeline, the cold flow inlet end of the low-temperature gas preheater 8 is communicated with the low-heat value gas supply end through a pipeline, the cold flow outlet end of the low-temperature gas preheater 8 is communicated with the cold flow inlet end of the high-temperature gas preheater 5 through a pipeline, and valves are arranged on the pipelines;
the air inlet end of the smoke mixing induced draft fan 9 is communicated with the heat flow outlet end of the low-temperature gas preheater 8 through a pipeline;
the smoke inlet end of the chimney 10 is communicated with the air outlet end of the smoke mixing induced draft fan 9 through a pipeline, and valves are arranged on the pipelines;
the flue gas purifying mechanism 3 is a mixed flue gas SCR denitration tower.
In the above technical scheme, the waste heat exchanger 4 is adopted to perform the second-stage waste heat recovery, and can be used for heating working medium water. Then, the high-temperature gas preheater 5, the empty smoke GGH heat exchanger 6 and the low-temperature gas preheater 8 are adopted to recycle the waste heat of the soot, and the specific flow is as follows:
soot flow: the soot leaving the waste heat exchanger 4 enters the high-temperature gas preheater 5, in the high-temperature gas preheater 5, the soot releases heat to the low-heat value gas from the low-temperature gas preheater 8, the medium-temperature waste heat of the soot is further recovered by heating the gas, the to-be-denitrified soot I with the temperature meeting the temperature requirement of the low-temperature mixed-smoke SCR denitration tower is formed, the to-be-denitrified soot I enters the mixer 7 before entering the mixed-smoke SCR denitration tower, the to-be-denitrified soot I is mixed with the empty soot heated by the empty-smoke GGH heat exchanger 6, the empty-smoke heated by the empty-smoke GGH heat exchanger 6 is called as to-be-denitrified soot II, and after the to-be-denitrified soot I and the to-be-denitrified soot II are mixed, the to-be-denitrified soot I is heated to meet the temperature requirement of the low-temperature mixed-smoke SCR denitration tower, and then enters the mixed-smoke SCR denitration tower for purification.
The temperature of the soot (denitration flue gas) purified by the mixed-smoke SCR denitration tower is higher than that of the empty smoke after heat absorption by the air heat accumulator, so that the soot purified by the mixed-smoke SCR denitration tower enters the empty smoke GGH heat exchanger 6 to heat up the empty smoke after heat absorption by the air heat accumulator, waste heat recovery is carried out, and the utilization rate of waste heat is improved.
And the temperature of the purified soot absorbed by the empty-soot GGH heat exchanger 6 is higher than that of the low-heat-value gas, so that the purified soot absorbed by the empty-soot GGH heat exchanger 6 continuously supplies heat to the low-temperature gas preheater 8, waste heat is further recovered, and the utilization rate of the waste heat is improved.
Low heating value gas flow: the low-heat value gas firstly enters a low-temperature gas preheater 8, the low-temperature waste heat of purified soot after absorbing heat by an empty-soot GGH heat exchanger 6 is recovered, then enters a high-temperature gas preheater 5, the temperature of the gas is raised to about 350 ℃ by using the medium-temperature waste heat of the soot, and finally the gas is continuously sprayed into a hearth through a burner 14 to participate in combustion reaction.
And (3) a smoke emptying flow: the high-temperature air smoke leaves the hearth, alternately enters the air heat accumulator 2 to release heat to the heat accumulator, is cooled by the heat accumulator to form low-temperature air smoke of 100-150 ℃, then enters the air smoke GGH heat exchanger 6 to exchange heat with denitration smoke with higher temperature after denitration to form to-be-denitration coal smoke II, then is mixed with to-be-denitration coal smoke I in the mixer 7 to enable the temperature to meet the temperature requirement of the low-temperature SCR denitration tower, after denitration by the mixed smoke SCR denitration tower, denitration smoke with higher temperature is formed, the denitration smoke enters the air smoke GGH heat exchanger 6 to release heat to the low-temperature air smoke, and then is discharged into the atmosphere by the mixed smoke induced draft fan 9 and the chimney 10.
For a clearer presentation of the soot flow, the following is shown in flow form:
high-temperature soot (high-temperature flue gas formed by the combustion products of gas combustion after heat release to a billet), a hearth preheating section 11 (heat release), a middle Wen Meiyan, a waste heat boiler heat exchanger (heat release), a high-temperature gas preheater 5 (heat release), a mixer 7 (mixed with soot II to be denitrated), a smoke mixing SCR denitration tower (denitration), an empty smoke GGH heat exchanger 6 (heat release), a low-temperature gas preheater 8 (heat release), a smoke mixing induced draft fan 9, a chimney 10 and emission;
low heat value gas-low temperature gas preheater 8 (endothermic heat) -high temperature gas preheater 5 (endothermic heat) -furnace (heating section 12, soaking section 13 burning);
low temperature air smoke, an air smoke GGH heat exchanger 6 (heat absorption), formation of the smoke II to be denitrified, mixing with the smoke I to be denitrified (heat absorption), smoke to be denitrified, a mixed smoke SCR denitrification tower (denitrification), an air smoke GGH heat exchanger 6 (heat release), a low temperature gas preheater 8 (heat release), a mixed smoke induced draft fan 9, a chimney 10 and discharge;
from the above process, it can be seen that the low heating value gas of the iron and steel enterprises is absorbed by the two stages of the low temperature gas preheater 8 and the high temperature gas preheater 5 to obtain the gas with the temperature of about 350 ℃ so as to meet the combustion requirement. And can continuously convey to the coal burner to realize continuous combustion, and fully utilize the waste heat of the discharged high Wen Meiyan. Mix with waiting denitration soot I in order to satisfy SCR denitration tower temperature requirement to through empty cigarette GGH heat exchanger 6, be used for the empty cigarette of heating low temperature again, cyclic utilization waste heat promotes recycle rate.
In another technical scheme, the flue gas purifying mechanism 3 further comprises a dust removing structure and a desulfurizing structure;
the dust removing structure and the desulfurizing structure are sequentially communicated on a pipeline between the gas outlet end of the mixer 7 and the gas inlet end of the mixed smoke SCR denitration tower; the dust removing structure is a cloth bag dust remover, and the desulfurization structure is a dry desulfurization device.
The air smoke and the soot not only contain nitrate pollutants, but also contain sulfur and dust, and in order to further reduce the pollution of the air smoke and the soot to the environment, a dust removing structure and a desulfurizing structure are added, and the air smoke and the soot are discharged after dust removal and desulfurization, so that the air smoke and the soot are more friendly to the environment.
Although embodiments of the present utility model have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the utility model would be readily apparent to those skilled in the art, and accordingly, the utility model is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (8)
1. The utility model provides a low oxygen boosting air heat accumulation steady state burning double smoke discharging heating furnace device which characterized in that includes:
the heating furnace comprises a hearth, a preheating section, a heating section and a soaking section, wherein the heating section and the soaking section are respectively provided with a burner and a side smoke outlet far away from the burner;
the cold flow outlet end of the waste heat recovery mechanism is used for respectively supplying preheated coal gas to the burner tip through a pipeline;
the air outlet ends of the air heat storages alternately supply the low oxygen-enriched air after heat storage to the burner through pipelines, and the air inlet ends of the air heat storages are communicated with a pressurized low oxygen-enriched air source through pipelines;
the side smoke outlets on the heating section and the soaking section are respectively communicated with the smoke inlet ends of the corresponding air heat storages through pipelines, and the side smoke outlets alternately supply smoke to the air heat storages in the same group;
the flue gas inlet end of the flue gas purifying mechanism is communicated with the hot flow outlet end of the waste heat recovery mechanism through a pipeline, and is communicated with the flue gas outlet end of the air heat accumulator through a pipeline; wherein, all be equipped with the valve on the pipeline.
2. The low oxygen enriched air regenerative steady state combustion double flue gas heating furnace device according to claim 1, wherein the waste heat recovery mechanism comprises:
the heat flow inlet end of the waste heat exchanger is communicated with the tail smoke outlet through a pipeline, and a valve is arranged on the pipeline;
the hot flow inlet end of the high-temperature gas preheater is communicated with the hot flow outlet end of the waste heat exchanger through a pipeline, and the cold flow outlet end of the high-temperature gas preheater supplies preheated gas to the burner through a pipeline;
the cold flow inlet end of the air-smoke GGH heat exchanger is communicated with the smoke outlet end of the air heat accumulator through a pipeline;
the gas inlet end of the mixer is respectively communicated with the cold flow outlet end of the air-flue GGH heat exchanger and the hot flow outlet end of the high-temperature gas preheater through pipelines, wherein the gas outlet end of the mixer is communicated with the gas inlet end of the flue gas purifying mechanism through pipelines;
the gas outlet end of the flue gas purifying mechanism is communicated with the heat flow inlet end of the air-flue GGH heat exchanger through a pipeline;
the cold flow inlet end of the low-temperature gas preheater is communicated with the cold flow inlet end of the high-temperature gas preheater through a pipeline, and valves are arranged on the pipeline.
3. The low oxygen enriched air regenerative steady state combustion double flue gas heating furnace device of claim 2, further comprising:
the air inlet end of the smoke mixing induced draft fan is communicated with the hot flow outlet end of the low-temperature gas preheater through a pipeline;
and the smoke inlet end of the chimney is communicated with the air outlet end of the smoke mixing induced draft fan through a pipeline, and valves are arranged on the pipeline.
4. The low oxygen-enriched air heat storage steady-state combustion double-smoke-discharging heating furnace device according to claim 2, wherein the smoke purifying mechanism is a mixed smoke SCR denitration tower.
5. The low oxygen-enriched air heat accumulation steady-state combustion double-smoke exhaust heating furnace device as set forth in claim 4, wherein the smoke purifying mechanism further comprises a dust removing structure and a desulfurizing structure;
the gas outlet end of the mixer is communicated with the pipeline between the gas inlet end of the mixed smoke SCR denitration tower in sequence, and the dust removing structure and the desulfurization structure are arranged on the pipeline.
6. The low oxygen-enriched air heat storage steady-state combustion double-smoke-discharging heating furnace device according to claim 5, wherein the dust removing structure is a bag-type dust remover, and the desulfurization structure is a dry-method desulfurizer.
7. The low oxygen-enriched air heat accumulation steady-state combustion double-smoke discharge heating furnace device as set forth in claim 1, further comprising a blower, wherein the air inlet end of the blower is communicated with the low oxygen-enriched air source through a pipeline, the air outlet end of the blower is communicated with the air heat accumulator through a pipeline, and valves are arranged on the pipelines.
8. The low oxygen-enriched air heat accumulation steady-state combustion double-smoke exhaust heating furnace device as set forth in claim 1, wherein the heating section and the burner on the soaking section are both a pair and are located opposite to each other in the position where the billet is placed.
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| CN202320372164.1U CN219494873U (en) | 2023-02-23 | 2023-02-23 | Low oxygen-enriched air heat accumulation steady-state combustion double-smoke-discharging heating furnace device |
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| CN202320372164.1U CN219494873U (en) | 2023-02-23 | 2023-02-23 | Low oxygen-enriched air heat accumulation steady-state combustion double-smoke-discharging heating furnace device |
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