CN117968378A - Heating furnace heating system and control method thereof - Google Patents
Heating furnace heating system and control method thereof Download PDFInfo
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- CN117968378A CN117968378A CN202410155045.XA CN202410155045A CN117968378A CN 117968378 A CN117968378 A CN 117968378A CN 202410155045 A CN202410155045 A CN 202410155045A CN 117968378 A CN117968378 A CN 117968378A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 136
- 238000000034 method Methods 0.000 title claims abstract description 79
- 238000005338 heat storage Methods 0.000 claims abstract description 231
- 239000000779 smoke Substances 0.000 claims abstract description 143
- 239000004071 soot Substances 0.000 claims abstract description 65
- 239000003245 coal Substances 0.000 claims abstract description 30
- 239000003034 coal gas Substances 0.000 claims abstract description 18
- 230000000630 rising effect Effects 0.000 claims abstract description 9
- 239000007789 gas Substances 0.000 claims description 256
- 238000009825 accumulation Methods 0.000 claims description 27
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 22
- 239000003546 flue gas Substances 0.000 claims description 22
- 238000002485 combustion reaction Methods 0.000 claims description 17
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 238000010926 purge Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 238000010792 warming Methods 0.000 claims 5
- 238000005096 rolling process Methods 0.000 description 30
- 230000001105 regulatory effect Effects 0.000 description 20
- 230000008569 process Effects 0.000 description 8
- 239000002893 slag Substances 0.000 description 4
- 230000001172 regenerating effect Effects 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B17/00—Furnaces of a kind not covered by any preceding group
-
- 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
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Environmental & Geological Engineering (AREA)
- Air Supply (AREA)
Abstract
The invention relates to a heating furnace temperature rising system and a control method thereof, belonging to the technical field of industrial heating furnaces. The device comprises a heat storage unit, a coal gas/coal smoke main pipeline, an air/air smoke main pipeline and a non-heat storage unit; the heat storage unit comprises a shared pipeline, a heat storage component and a three-way valve; the main gas/smoke pipeline comprises a smoke pipeline and a first gas pipeline; the air/air smoke main pipeline comprises an air smoke pipeline and a first air pipeline; the non-heat storage unit comprises a second gas pipeline, a second air pipeline and a burner; the first gas pipeline is used for conveying gas, the first air pipeline and the second air pipeline are used for conveying air, and the empty smoke pipeline and the soot pipeline are used for exhausting smoke; the three-way valve realizes the reversing of air source flow. The invention divides the temperature in the heating furnace into three temperature intervals, and corresponds to three control methods for burning and supplying heat, and combines the automatic reversing of the three-way valve to realize the effective baking of the heat accumulator in the heat accumulating assembly in the heating process, thereby prolonging the service life of the heat accumulator and improving the effective utilization rate of the burning gas.
Description
Technical Field
The invention belongs to the technical field of industrial heating furnaces, and relates to a heating furnace heating system and a control method thereof.
Background
The industrial heating furnace is used as high-energy-consumption equipment of iron and steel enterprises, and the heating efficiency of the industrial heating furnace becomes an important assessment index of the equipment. The double heat accumulation combustion mode becomes an important way for improving the heating efficiency, and the double heat accumulation combustion mode also realizes the high-efficiency utilization of the low-heat-value blast furnace gas.
The existing heating furnace temperature rising system generally realizes heating of an air source entering the heating furnace by means of a heat accumulation-heat release process of a heat accumulator, the temperature of the heat accumulator rises quickly, the temperature fluctuation is large in the heating process, the temperature change in the initial heating stage is difficult to accurately control, the temperature in the heating furnace rises quickly, the service life of the refractory in the furnace is easy to reduce, and the refractory is deformed and even cracked due to the fact that the temperature is too high. Aiming at the prior heating furnace heating system, the effective control method for the heating furnace heating process is still lacking, so that the temperature fluctuation of the prior heating furnace heating process is large, the heating effect is unstable, the product quality and the production efficiency are affected, and the potential safety hazards of high energy consumption, environment protection, fire disaster, explosion and the like are also present.
In addition, the primary furnace baking at the initial stage of the double heat storage heating furnace construction and the secondary furnace starting after the periodical (about 6 months) furnace shutdown, overhaul and slag removal in the production process all need to be performed in the furnace baking and furnace starting temperature rising processes.
If the temperature rising process is operated manually, the labor intensity of personnel is high easily due to long temperature rising process time, and the tired feeling is enhanced; the manual operation has large hysteresis, is easy to cause excessive high furnace pressure, and causes 'hot waves' to overflow to damage the external equipment of the heating furnace; the temperature of the exhaust gas is easy to be too high, and the attached temperature sensor of the exhaust gas pipeline is damaged.
Therefore, there is a need to optimize the problems of the heating system of the current heating furnace, and correspondingly propose an effective control method.
Disclosure of Invention
In view of the above, the invention aims to provide a heating furnace heating system and a control method thereof, which solve the defects of large temperature fluctuation, difficult control and the like in the prior heating process of the heating furnace heating system, and realize the gradual heating process of the heating furnace.
In order to achieve the above purpose, the present invention provides the following technical solutions:
The heating furnace temperature rising system comprises a heat storage unit, a coal gas/coal smoke main pipeline, an air/air smoke main pipeline and a non-heat storage unit, wherein the heat storage unit and the non-heat storage unit are arranged in a heating furnace, the heat storage unit and the non-heat storage unit are respectively connected with the air/air smoke main pipeline, and the coal gas/coal smoke main pipeline is connected with the heat storage unit;
the heat storage unit comprises a shared pipeline and a heat storage component arranged on the shared pipeline, and the heat storage component comprises an air heat storage component and a gas heat storage component which are respectively used for heating air and gas; the three-way valve is connected with the common pipeline;
the coal gas/coal smoke main pipeline comprises a coal smoke pipeline and a first coal gas pipeline, and the coal smoke pipeline and the first coal gas pipeline are respectively communicated with the common pipeline through the three-way valve;
The air/air smoke main pipeline comprises an air smoke pipeline and a first air pipeline, and the air smoke pipeline and the first air pipeline are respectively communicated with the common pipeline through the three-way valve;
the non-heat storage unit comprises a second gas pipeline and a second air pipeline, the second gas pipeline and the second air pipeline are respectively connected with the burner, and the second air pipeline is communicated with the first air pipeline;
The first gas pipeline conveys gas to the heat storage component, the first air pipeline conveys air to the heat storage component, the gas and the air are combusted at the heat storage component for heat supply, and the heat storage component is provided with a temperature sensor for detecting the temperature of the gas output from the heat storage component; the air conveyed by the first air pipeline is conveyed to the burner through the second air pipeline, the second gas pipeline conveys gas to the burner, and the air and the gas are combusted at the burner for heat supply;
and the flue gas generated in the heating furnace sequentially passes through the heat storage component, the shared pipeline and the three-way valve and is discharged through a coal flue pipeline or an air flue pipeline.
Optionally, the heat storage units are provided with at least two heat storage units, and two ends of the three-way valve are respectively connected with a shared pipeline of the two heat storage units; when one heat storage unit enters a heat storage period, the other heat storage unit enters a heat release period; the heat accumulation period is that the temperature of gas is higher than the temperature of a heat accumulator in the heat accumulation assembly, and the gas releases heat to the heat accumulator; the heat release period is that the temperature of the gas is lower than the temperature of a heat accumulator in the heat accumulation assembly, and the heat accumulator releases heat to the gas.
Optionally, the three-way valve comprises a first three-way valve and a second three-way valve, the first three-way valve is respectively connected with the first gas pipeline and the soot pipeline, and the second three-way valve is respectively connected with the first air pipeline and the empty smoke pipeline.
Optionally, one end of the first three-way valve, which is close to the common pipeline, is provided with a gas reversing valve and a soot reversing valve, and one end of the second three-way valve, which is close to the common pipeline, is provided with an air reversing valve and an air-soot reversing valve.
Optionally, the gas reversing valve and the soot reversing valve are in an interlocking relationship, the air reversing valve and the air reversing valve are also in an interlocking relationship, and the interlocking relationship means that one is opened and the other is correspondingly closed.
Optionally, a gas quick-cutting valve, a gas blind plate valve and a gas cut-off valve are sequentially arranged on the second gas pipeline.
A control method of a heating furnace heating system, which is applied to the heating furnace heating system of claim 1, wherein the temperature in the heating furnace is in a first stage between room temperature and 600 ℃, the first control method is adopted, the second stage is adopted between 600 ℃ and 750 ℃, the second control method is adopted, the third stage is adopted between 750 ℃ and 1200 ℃, and the third control method is adopted;
the control method of the heating furnace temperature rising system comprises the following steps:
s1, judging a temperature interval of a stage of the temperature of a heating furnace, and selecting a control method of the corresponding temperature interval;
s2, heating the heating furnace according to the selected control method;
wherein the first control method is to supply heat by using the non-heat storage unit; the second control method is that the non-heat storage unit is used for heating, when the temperature of the heating furnace is kept at a temperature (600 ℃ < a < 750 ℃) and no longer continuously increased, the heat storage unit is opened, and the heat storage unit and the non-heat storage unit supply heat together; the third control method supplies heat to the heat storage unit and the non-heat storage unit together;
in the second control method, part of the heat storage units participate in heat supply, and the proportion of the heat storage units participating in heat supply is small, and heat supply is mainly performed by using non-heat storage units; in the third control method, the proportion of the heat storage units participating in heat supply is high, and the heat storage units are mainly used for heat supply.
Optionally, the three-way valve is provided with a gas reversing valve and a soot reversing valve, and the gas reversing valve and the soot reversing valve are in an interlocking relationship; the three-way valve is also provided with an air reversing valve and an air-smoke reversing valve which are in an interlocking relationship; the interlocking relationship means that one side is opened and the other side is correspondingly closed; the air conveyed by the first air pipeline is input into the heat storage unit through the air reversing valve, and the gas conveyed by the first gas pipeline is input into the heat storage unit through the gas reversing valve; the first control method includes the steps of:
The method comprises the steps of firstly, respectively opening a second gas pipeline and a first air pipeline to provide gas and air for a combustor, so that the combustor can normally burn and supply heat, and high-temperature flue gas generated after combustion exchanges heat in an air heat storage component in a heat storage period;
And opening an air reversing valve and an air smoke reversing valve, periodically and automatically reversing the air reversing valve and the air smoke reversing valve, and keeping the gas reversing valve and the coal smoke reversing valve in a closed state, wherein the flue gas after heat exchange is discharged through a shared pipeline, the air smoke reversing valve and an air smoke pipeline.
Optionally, two heat storage units are provided, and two ends of the three-way valve are respectively connected with a shared pipeline of the two heat storage units; when one heat storage unit enters a heat storage period, the other heat storage unit simultaneously enters a heat release period; the heat accumulation period is that the temperature of gas is higher than the temperature of a heat accumulator in the heat accumulation assembly, and the gas releases heat to the heat accumulator; the heat release period is that the temperature of the gas is lower than the temperature of a heat accumulator in the heat accumulation assembly, and the heat accumulator releases heat to the gas;
The three-way valve comprises a first three-way valve and a second three-way valve, the first three-way valve is respectively connected with the first gas pipeline and the coal smoke pipeline, and the second three-way valve is respectively connected with the first air pipeline and the air smoke pipeline;
A gas reversing valve and a soot reversing valve are arranged at one end, close to the shared pipeline, of the first three-way valve, and an air reversing valve are arranged at one end, close to the shared pipeline, of the second three-way valve;
The gas reversing valve and the soot reversing valve are in an interlocking relationship, the air reversing valve and the air reversing valve are also in an interlocking relationship, and the interlocking relationship means that one side is opened and the other side is correspondingly closed.
The second control method includes the steps of:
The first step, a second gas pipeline and a first air pipeline are respectively opened to provide gas and air for the burner, so that the burner can normally burn and supply heat; the high-temperature flue gas generated after combustion exchanges heat in a heat storage unit in a heat storage period until the temperature in a heating furnace reaches a (600 ℃ less than 750 ℃);
the second step, after the temperature in the heating furnace reaches a and does not rise any more, a second three-way valve is opened, so that the air reversing valves and the air smoke reversing valves close to the two heat storage units are periodically and automatically reversed, and then a first gas pipeline is opened to convey gas to a gas heat storage component in the heat storage unit in a heat release period; the first three-way valve is opened, so that the gas reversing valve is kept in an open state all the time, the soot reversing valve is kept in a closed state all the time, nitrogen purging and gas replacement are convenient to conduct, at the moment, the first gas pipeline supplies gas to the gas heat storage component, and the second gas pipeline supplies gas to the burner; in the heating process, the air reversing valve and the air-smoke reversing valve are kept to carry out periodic automatic reversing, and the flue gas subjected to heat exchange and cooling is discharged through the air-smoke reversing valve.
Optionally, two heat storage units are provided, and two ends of the three-way valve are respectively connected with a shared pipeline of the two heat storage units; when one heat storage unit enters a heat storage period, the other heat storage unit simultaneously enters a heat release period; the heat accumulation period is that the temperature of gas is higher than the temperature of a heat accumulator in the heat accumulation assembly, and the gas releases heat to the heat accumulator; the heat release period is that the temperature of the gas is lower than the temperature of a heat accumulator in the heat accumulation assembly, and the heat accumulator releases heat to the gas;
The three-way valve comprises a first three-way valve and a second three-way valve, the first three-way valve is respectively connected with the first gas pipeline and the coal smoke pipeline, and the second three-way valve is respectively connected with the first air pipeline and the air smoke pipeline;
A gas reversing valve and a soot reversing valve are arranged at one end, close to the shared pipeline, of the first three-way valve, and an air reversing valve are arranged at one end, close to the shared pipeline, of the second three-way valve;
The gas reversing valve and the soot reversing valve are in an interlocking relationship, the air reversing valve and the air reversing valve are also in an interlocking relationship, and the interlocking relationship means that one side is opened and the other side is correspondingly closed.
The third control method includes the steps of:
The method comprises the steps of firstly, opening a first gas pipeline to convey gas to a gas heat storage component, opening a second gas pipeline to convey gas to a burner, and opening a first air pipeline to convey air to an air heat storage component and the burner; at the moment, the burner normally burns to supply heat, one heat storage unit enters a heat storage period, and the other heat storage unit enters a heat release period;
Secondly, performing double reversing heat supply: opening an air reversing valve and a gas reversing valve which are connected with a heat storage unit in a heat release period, and opening an air-smoke reversing valve and a coal-smoke reversing valve which are connected with the heat storage unit in the heat release period, wherein air and coal gas which enter from a first air pipeline and a first coal gas pipeline respectively exchange heat in the heat storage unit in the heat release period and generate high-temperature smoke after combustion, and the high-temperature smoke is discharged through a first path and/or a second path after being cooled through the heat storage unit in the heat storage period; the first path is a common pipeline, an empty smoke reversing valve and an empty smoke pipeline, and the second path is a common pipeline, an coal smoke reversing valve and an coal smoke pipeline;
The air reversing valve, the gas reversing valve, the air-smoke reversing valve and the soot reversing valve are periodically and automatically reversed, namely when the air reversing valve and the gas reversing valve are only opened at one end of the first three-way valve and the second three-way valve, which are connected with the same heat storage unit, the air reversing valve and the soot reversing valve are only opened at the other end of the first three-way valve and the second three-way valve.
The invention has the beneficial effects that:
The dual heat accumulation heating furnace heating system is additionally provided with the second gas pipeline, a plurality of burners are arranged on the second gas pipeline, the burners are respectively communicated with the second gas pipeline and the first air pipeline, and the combustion heat supply of the burners is realized through the fuel gas supply of the second gas pipeline and the first air pipeline. The invention can be widely applied to regenerative heating furnaces in metallurgical industry, in particular to a double regenerative heating furnace with low fuel heat value, which is suitable for the heating process of primary baking after the double regenerative heating furnace is built and restarting after the slag is removed after overhauling; the gradual heating process of starting the furnace again after primary furnace baking and overhauling and slag removal is conveniently realized, and the problems that the temperature is too fast and difficult to control when a heat accumulator is adopted for heating during furnace baking and furnace starting again are avoided. The three heating control methods are respectively suitable for three temperature intervals of the heating furnace, can realize effective baking of the heat accumulator in the air heat accumulation assembly and the gas heat accumulation assembly in the heating process, and prolong the service life of the heat accumulator; and the effective utilization rate of the combustion gas can also be improved.
The automatic control system is matched with the automatic control system, so that the automatic selection of a heating control method and the automatic reversing of the three-way valve can be realized, the automatic control of the heating process of starting the heating furnace after the first furnace baking, the overhauling and the slag removal is realized, and the labor intensity of operators is effectively reduced; in addition, the high-efficiency control of the furnace pressure can be realized, and equipment damage caused by high local smoke discharging temperature after manual operation is avoided.
Additional advantages, objects, and features of the invention 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 invention. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in the following preferred detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of the heating system of the heating furnace.
Reference numerals:
1a heat storage unit, 11 a shared pipeline, 111 an air/air smoke shared pipeline, 112 a coal gas/coal smoke shared pipeline, 12 a heat storage component, 121 an air heat storage component, 122 a coal gas heat storage component and 13 a temperature sensor;
2 non-thermal storage unit, 21 second gas conduit, 22 second air conduit, 23 burner;
The air/air smoke main pipeline is 3, the air smoke pipeline is 31, the air smoke regulating valve is 311, the air smoke induced draft fan is 312, the first air pipeline is 32, the combustion-supporting fan is 321, the gate valve is 322, and the air regulating valve is 323;
A 4 three-way valve, a 41 gas reversing valve, a 42 soot reversing valve, a 43 empty smoke reversing valve and a 44 air reversing valve;
The gas-liquid separator comprises a 5 gas/coal smoke main pipeline, a 54 coal smoke pipeline, a 541 coal smoke induced draft fan, a 542 coal smoke regulating valve, a 55 first gas pipeline, a 551 gas quick-cut valve, a 552 gas blind plate valve, a 553 gas cut-off valve and a 554 gas regulating valve.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present invention by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.
Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to limit the invention; for the purpose of better illustrating embodiments of the invention, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numbers in the drawings of embodiments of the invention correspond to the same or similar components; in the description of the present invention, it should be understood that, if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc., that indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but not for indicating or suggesting that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and should not be construed as limiting the present invention, and that the specific meaning of the above terms may be understood by those of ordinary skill in the art according to the specific circumstances.
Referring to fig. 1, a heating furnace temperature raising system comprises a heating furnace, a heat storage unit 1, a main gas/soot pipeline 5, a main air/empty smoke pipeline 3 and a non-heat storage unit 2, wherein the heat storage unit 1 and the non-heat storage unit 2 are arranged in the heating furnace, the heat storage unit 1 and the non-heat storage unit 2 are respectively connected with the main air/empty smoke pipeline 3, and the main gas/soot pipeline 5 is connected with the heat storage unit 1; the heat accumulating unit 1 and the non-heat accumulating unit 2 are respectively connected with independent main air/air smoke pipes 3.
The heat storage unit 1 comprises a common pipe 11 and a plurality of heat storage components 12 arranged on the common pipe 11 side by side, wherein a temperature sensor 13 is arranged on the heat storage components 12 and is used for detecting the temperature of gas output from the heat storage components 12; the heat storage unit 12 is connected to the heating furnace through a common pipe 11, and a control valve is provided between the common pipe 11 and the heating furnace. The thermal storage unit 1 further includes a three-way valve 4.
The main gas/soot duct 5 comprises a soot duct 54 and a first gas duct 55, said soot duct 54 and said first gas duct 55 being in communication with said common duct 11 via said three-way valve 4, respectively.
In the embodiment, two heat storage units 1 are arranged on the rolling mill side and the non-rolling mill side of the heating furnace respectively, each heat storage unit 1 comprises two heat storage components 12, namely an air heat storage component 121 and a gas heat storage component 122, which are used for heating air and gas respectively; the air heat storage component 121 is communicated with the air/air smoke main pipeline 3 through the common pipeline 11 and the three-way valve 4 in sequence, and the gas heat storage component 122 is communicated with the coal smoke pipeline 54 and the first gas pipeline 55 through the common pipeline 11 and the three-way valve 4 in sequence. When one heat storage unit 1 enters a heat storage period, the other heat storage unit 1 enters a heat release period at the same time; the heat accumulation period is that the temperature of the gas is higher than the temperature of a heat accumulator in the heat accumulation assembly 12, and the gas releases heat to the heat accumulator; the exothermic period is when the gas temperature is lower than the temperature of the thermal mass within the thermal storage assembly 12, which releases heat to the gas.
When one of the heat storage units 1 is in the heat storage period, the other is in the heat release period, and the switching of the input of the air source and the discharge of the flue gas is realized by controlling the opening and closing of the three-way valve 4 and the control valve. The temperature of the air and the gas which are introduced into the heat storage unit 1 in the heat release period is lower than the temperature of a heat accumulator in the heat storage component 12 of the heat storage unit 1, after the introduced air and gas exchange heat with the heat accumulator, the temperature of the heat accumulator is reduced (heat release of the heat accumulator is realized), the temperature of the air and the gas is increased, high-temperature air and smoke are generated by combustion in the heat storage component 12, and are output through the other heat storage unit 1 in the heat storage period and the corresponding air and smoke pipeline 31 and the corresponding smoke pipeline 54, and the high-temperature air and smoke generated after combustion exchange heat with the heat accumulator in the heat storage component 12 of the heat storage unit 1 when passing through the heat storage unit 1 in the heat storage period, so that the temperature of the air and the smoke is reduced, and the temperature of the heat accumulator is increased, and the heat storage of the heat accumulator is realized.
The two heat storage units 1 on the rolling mill side and the non-rolling mill side are divided into one heat storage unit group, and in some embodiments of the scheme, a plurality of heat storage unit groups, such as 3-4 heat storage unit groups, can be arranged in the heating furnace according to actual requirements, and each heat storage unit group can independently perform a heat storage-heat release process in the scheme of the invention.
The main air/air duct 3 includes an air duct 31 and a first air duct 32 which are respectively communicated with the three-way valve 4. The air smoke adjusting valve 311 and the air smoke induced draft fan 312 are sequentially arranged on the air smoke pipeline 31 from the three-way valve 4 to the direction away from one end of the three-way valve 4, and the air smoke is led out of the air smoke pipeline 31 through the air smoke induced draft fan 312, and the air smoke adjusting valve 311 is used for adjusting the air smoke amount discharged out of the heat storage unit 1; an air regulating valve 323, a gate valve 322 and a combustion fan 321 are sequentially arranged on the first air pipeline 32 from the three-way valve 4 to a direction away from one end of the three-way valve 4, air is introduced into the first air pipeline 32 through the combustion fan 321, the air quantity entering the heat storage unit 1 is regulated through the air regulating valve 323, and the gate valve 322 controls the opening and closing of the first air pipeline 32.
The two heat storage units 1 share one soot duct 54, one first gas duct 55, one empty-soot duct 31 and one first air duct 32. The soot duct 54 and the empty smoke duct 31 are collectively referred to as a smoke exhaust duct.
In this embodiment, two three-way valves 4 are provided, namely a first three-way valve 4 and a second three-way valve 4, two ends of each three-way valve 4 are respectively communicated with the shared pipeline 11 of two heat storage units 1, wherein the middle part of the first three-way valve 4 is connected with a soot pipeline 54 and a first gas pipeline 55, the middle part of the second three-way valve 4 is connected with an empty flue pipeline 31 and a first air pipeline 32, each end, close to the shared pipeline 11, of the first three-way valve 4 is provided with a gas/soot reversing valve, and each end, close to the shared pipeline 11, of the second three-way valve 4 is provided with an air/empty soot reversing valve.
The gas/soot diverter valve comprises a gas diverter valve 41 and a soot diverter valve 42, and the gas diverter valve 41 and the soot diverter valve 42 are in an interlocking relationship; the air/air-to-smoke diverter valve includes an air diverter valve 44 and an air-to-smoke diverter valve 43, the air diverter valve 44 and the air-to-smoke diverter valve 43 also being in an interlocking relationship, the interlocking relationship meaning that one is open and the other is correspondingly closed.
By controlling the opening and closing of the three-way valve 4 and the control valve, in the heat storage period of the heat storage component 12, high-temperature flue gas in the heating furnace is conveyed to the heat storage component 12 through the common pipeline 11 to heat the heat storage body in the heat storage component 12, and the high-temperature flue gas is discharged through the three-way valve 4 and the smoke exhaust pipeline after heat exchange and cooling in the heat storage component 12; during the heat release period of the heat storage component 12, the gas to be heated enters the heat storage component 12 through the air/air smoke main pipeline 3 and the shared pipeline 11 for heating, and the gas to be heated is conveyed into the heating furnace through the shared pipeline 11 after being heated.
A soot regulating valve 542 and a soot induced draft fan 541 are sequentially arranged on the soot pipeline 54 from the three-way valve 4 to the direction away from one end of the three-way valve 4, soot is led out of the soot pipeline 54 through the soot induced draft fan 541, and the soot regulating valve 542 is used for regulating the amount of the soot discharged out of the heat storage unit 1; the first gas pipe 55 is provided with a gas quick-cut valve 551, a gas blind plate valve 552, a gas cut-off valve 553 and a gas regulating valve 554 in sequence.
The gas quick-cutting valve 551 is used for automatically and quickly closing the gas supply valve when the temperature of a detection point in the equipment exceeds a set limit value, and stopping the supply of gas; the gas blind plate valve 552 and the gas cut-off valve 553 can realize the function of cutting off the gas supply; the gas regulating valve 554 is used to regulate the supply of gas on the pipeline.
The non-heat storage unit 2 comprises a second gas pipeline 21 and a second air pipeline 22 which are communicated, and further comprises a plurality of burners 23, wherein each burner 23 is provided with an air joint and a gas joint, the air joints are connected with the second air pipeline 22, the gas joints are communicated with the second gas pipeline 21, and the second air pipeline 22 is also communicated with the first air pipeline 32. The gas entering the second gas pipeline 21 is output through a gas joint and combusted at the burner 23; the air in the first air duct 32 is input into the second air duct 22 and output through the air connector to be burned at the burner 23. The second gas pipe 21 is provided with a gas quick-cut valve 551, a gas blind plate valve 552 and a gas cut-off valve 553 in sequence. In this embodiment, when the burner 23 performs combustion heating, one or more burners 23 may be selectively turned on to heat the gas or air according to the actual heating requirement, or one burner 23 may be turned on first, and then a plurality of burners 23 may be turned on sequentially according to the heating condition, so as to achieve gradual temperature rise in the heating process of the burner 23.
The common duct 11 includes an air/air-smoke common duct 111 and a gas/soot common duct 112. The air/air-smoke common pipe 111 is connected with an air/air-smoke reversing valve on the three-way valve 4, and the gas/coal-smoke common pipe 112 is connected with a gas/coal-smoke reversing valve on the three-way valve 4. Air/air smoke enters or exits the heat storage unit 1 through an air/air smoke shared pipe 111, and coal gas/coal smoke enters or exits the heat storage unit 1 through a coal gas/coal smoke shared pipe 112.
When the heating furnace starts to perform furnace baking operation and starts to operate after furnace stopping, the soot induced draft fan 541, the soot regulating valve 542 and the gas burner are kept in a closed state in the middle temperature and low temperature stages of operation. The operator opens the air burner, the air regulating valve 323, the gate valve 322 and the combustion fan 321 in the heating furnace section, opens the air reversing valve 44 on the rolling mill side, closes the air reversing valve 44 on the non-rolling mill side, and then opens the air-smoke reversing valve 43, the air-smoke regulating valve 311 and the air-smoke induced draft fan 312 on the non-rolling mill side. After this operation is completed, the air burner on the rolling mill side is ventilated and cooled, and the air burner on the non-rolling mill side is discharged. When the temperature sensor 13 at the non-rolling mill side senses that the front temperature of the air burner is more than or equal to 180 ℃, the air-smoke reversing valve 43 at the non-rolling mill side is closed, the air-smoke reversing valve 44 at the non-rolling mill side is opened, then the air-smoke reversing valve 43 at the rolling mill side is opened, and the air reversing valve 44 at the rolling mill side is closed. When the temperature sensor 13 at the rolling mill side senses that the front temperature of the air burner is more than or equal to 180 ℃, the air-smoke reversing valve 43 at the rolling mill side is closed, the air reversing valve 44 at the rolling mill side is opened, then the air-smoke reversing valve 43 at the non-rolling mill side is opened, and the air reversing valve 44 at the non-rolling mill side is closed. When the heat storage unit 1 on the rolling mill side enters the heat storage period, the heat storage unit 1 on the non-rolling mill side enters the heat release period, and the heat storage units are alternately circulated in such a way that one circulation period is about 60 s.
In the operation process, the furnace pressure can be regulated by regulating the opening of the air regulating valve 323 and the air smoke regulating valve 311, so that the micro positive pressure is maintained, and the damage to equipment and personnel caused by overflow high-temperature furnace gas of the blast furnace pressure is avoided.
The heat storage unit 1 in the embodiment can be connected to an automatic control system, control actions are set through a program, control keys are displayed on an operation terminal picture, and the heating system can be started/stopped by one key to automatically control the heat storage and heat release circulation processes.
A control method based on the heating system of the heating furnace comprises a first stage (room temperature-600 ℃), a second stage (600-750 ℃) and a third stage (750-1200 ℃), wherein when the temperature of the heating furnace is in a temperature interval of the first stage, a first control method, namely an air single reversing control method, is selected, when the temperature of the heating furnace is in a temperature interval of the second stage, a second control method, namely a replacement control method, is selected, and when the temperature of the heating furnace is in a temperature interval of the third stage, a third control method, namely an air-gas double reversing control method, is selected. According to the actual heating requirement, a single control method can be adopted, or two or more methods can be combined, for example, a first control method is used for heating, a second control method is used for heating after a certain temperature is reached, and the like.
The heating furnace temperature rising process comprises the following steps:
s1, judging a temperature interval of a stage of the temperature of a heating furnace, and selecting a control method of the corresponding temperature interval;
s2, heating the heating furnace according to the selected control method.
When the first control method, i.e. the air single reversing control method, is selected in step S2, the non-heat storage unit 2 is used for supplying heat, and the air heat storage component 121 of the heat storage unit 1 is used for exhausting smoke, which comprises the following steps:
The first step, the gas and the air are respectively supplied to the burner 23 through the second gas pipeline 21 and the first air pipeline 32, so that the burner 23 can normally burn and supply heat; the method comprises the following specific steps: the gas cut-off valve 553, the gas blind plate valve 552 and the gas cut-off valve 553 on the second gas pipeline 21, the gas interface and the air interface of the burner 23, the combustion-supporting fan 321 and the gate valve 322 on the first air pipeline 32 are opened, the second gas pipeline 21 inputs gas to the burner 23 through the gas interface of the burner 23, and the first air pipeline 32 inputs air to the burner 23 through the second air pipeline 22 and the air interface of the burner 23, so that the burner 23 normally burns to supply heat; the high-temperature flue gas generated after combustion exchanges heat with a heat accumulator in the air heat accumulation assembly 121 in a heat accumulation period in the heating furnace;
And secondly, opening the air/air smoke reversing valve, automatically reversing the air/air smoke reversing valve (automatically reversing once at intervals of one cycle and about 60s for one cycle), and keeping the gas/coal smoke reversing valve in a closed state, wherein the flue gas after heat exchange is discharged through the common pipeline 11, the air smoke reversing valve 43 and the air smoke pipeline 31.
When the heat storage unit 1 at the rolling mill side supplies heat, the gas reversing valve 41 and the air reversing valve 44 at the rolling mill side are opened, and correspondingly, the soot reversing valve 42 and the empty reversing valve 43 at the rolling mill side are closed; when the non-rolling mill side heat storage unit 1 stores heat, the non-rolling mill side soot diverter valve 42 and the empty soot diverter valve 43 are both opened, and the non-rolling mill side gas diverter valve 41 and the air diverter valve 44 are both closed accordingly. When the non-rolling mill side temperature sensor 13 indicates more than 180 ℃, the reversing valve switches the on/off state.
When a second control method, namely a replacement control method, is selected in the step S2, the non-heat storage unit 2 is used for heating, and then the non-heat storage unit 2 and the heat storage unit 1 are used for heating at the same time; in the second control method, part of the heat storage units participate in heat supply, and the proportion of the heat storage units participating in heat supply is small, and heat supply is mainly performed by using non-heat storage units; the method comprises the following steps:
The first step, the gas and the air are respectively supplied to the burner 23 through the second gas pipeline 21 and the first air pipeline 32, so that the burner 23 can normally burn and supply heat; the method comprises the following specific steps: the gas cut-off valve 553, the gas blind plate valve 552 and the gas cut-off valve 553 on the second gas pipeline 21, the gas interface and the air interface of the burner 23 are opened, the combustion-supporting fan 321 and the gate valve 322 on the first air pipeline 32 are opened, the second gas pipeline 21 inputs gas to the burner 23 through the gas interface of the burner 23, and the first air pipeline 32 inputs air to the burner 23 through the second air pipeline 22 and the air interface of the burner 23, so that the burner 23 normally burns to supply heat; the high-temperature flue gas generated after combustion exchanges heat with a heat accumulator in a heat accumulating unit 1 in a heat accumulating period in a heating furnace until the temperature in the heating furnace reaches a (600 ℃ < a < 750 ℃);
Secondly, after the temperature in the heating furnace reaches a and the temperature is kept after the temperature a cannot be continuously increased, conveying gas to a gas heat storage component 122 in the heat storage unit 1 in the heat release period through a first gas pipeline 55; the method comprises the following specific steps: the second three-way valve is opened to periodically and automatically reverse the air reversing valve 44 and the air-smoke reversing valve 43 which are close to the two heat storage units 1, and then the gas cutting valve 553, the gas blind plate valve 552, the gas cutting valve 553 and the gas regulating valve 554 of the first gas pipeline 55 are opened to convey gas to the gas heat storage component 122 in the heat storage unit 1 in the heat release period; the first three-way valve is opened, so that the gas reversing valves 41 on the rolling mill side and the non-rolling mill side are kept in an open state all the time, the soot reversing valve 42 is kept in a closed state all the time, nitrogen purging and gas replacement are convenient to conduct, at the moment, the first gas pipeline 55 supplies gas to the gas heat storage assembly 122, and the second gas pipeline 21 supplies gas to the burner 23; in the heating process, the air reversing valve 44 and the air-smoke reversing valve 43 are kept to carry out periodic automatic reversing, and the flue gas subjected to heat exchange and cooling is discharged through the air-smoke reversing valve 43.
When a third control method, namely an air-gas double reversing control method, is selected in the step S2, the non-heat storage unit 2 and the heat storage unit 1 are used for supplying heat at the same time; in the third control method, the proportion of the heat storage units participating in heat supply is higher, and the heat storage units are mainly used for heat supply;
the method comprises the following steps:
The first step, the gas cut-off valve 553, the gas blind plate valve 552 and the gas cut-off valve 553 of the first gas pipeline 55 and the second gas pipeline 21 are respectively opened, the combustion-supporting fan 321 and the gate valve 322 of the first air pipeline 32 are opened, at this time, the second gas pipeline 21 supplies gas to the burner 23, the first gas pipeline 55 supplies gas to the gas heat storage component 122, the air is respectively conveyed to the air heat storage component 121 and the second air pipeline 22 through the first air pipeline 32, the air entering the second air pipeline 22 is conveyed to the burner 23, at this time, the burner 23 is normally burnt for heat supply, one heat storage unit 1 enters a heat storage period, and the other heat storage unit 1 enters a heat release period;
Secondly, performing double reversing heat supply: opening an air reversing valve 44 and a gas reversing valve 41 which are connected with the heat storage unit 1 in the heat release period, and opening an air smoke reversing valve 43 and a coal smoke reversing valve 42 which are connected with the heat storage unit 1 in the heat release period, wherein air and coal gas which enter from a first air pipeline 32 and a first coal gas pipeline 55 respectively exchange heat in the heat storage unit 1 in the heat release period and generate high-temperature smoke after combustion, and the high-temperature smoke is discharged out of the system through a shared pipeline 11, the air smoke reversing valve 43 and the coal smoke reversing valve 42, a coal smoke pipeline 54 and an air smoke pipeline 31 after being cooled through the heat exchange of the heat storage unit 1 in the heat storage period respectively; the air reversing valve 44, the gas reversing valve 41, the empty smoke reversing valve 43 and the soot reversing valve 42 are periodically and automatically reversed, namely, when one end of the two three-way valves 4 connected with the same heat storage unit 1 is used for opening only the air reversing valve 44 and the gas reversing valve 41, the other end of the two three-way valves 4 is used for opening only the empty smoke reversing valve 43 and the soot reversing valve 42.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the claims of the present invention.
Claims (10)
1. A heating furnace heating system, characterized in that: the device comprises a heat storage unit (1), a coal gas/coal smoke main pipeline (5), an air/air smoke main pipeline (3) and a non-heat storage unit (2), wherein the heat storage unit (1) and the non-heat storage unit (2) are arranged in a heating furnace, the heat storage unit (1) and the non-heat storage unit (2) are respectively connected with the air/air smoke main pipeline (3), and the coal gas/coal smoke main pipeline (5) is connected with the heat storage unit (1);
The heat storage unit (1) comprises a common pipeline (11) and a heat storage assembly (12) arranged on the common pipeline (11), wherein the heat storage assembly (12) comprises an air heat storage assembly (121) and a gas heat storage assembly (122); the three-way valve (4) is connected with the common pipeline (11);
The main gas/coal smoke pipeline (5) comprises a coal smoke pipeline (54) and a first gas pipeline (55), and the coal smoke pipeline (54) and the first gas pipeline (55) are respectively communicated with the common pipeline (11) through the three-way valve (4);
The air/air smoke main pipeline (3) comprises an air smoke pipeline (31) and a first air pipeline (32), and the air smoke pipeline (31) and the first air pipeline (32) are respectively communicated with the common pipeline (11) through the three-way valve (4);
the non-heat storage unit (2) comprises a second gas pipeline (21) and a second air pipeline (22), the second gas pipeline (21) and the second air pipeline (22) are respectively connected with a burner (23), and the second air pipeline (22) is communicated with the first air pipeline (32);
the first gas pipeline (55) conveys gas to the heat storage assembly (12), the first air pipeline (32) conveys air to the heat storage assembly (12), and the gas and the air burn at the heat storage assembly (12) for heat supply; the air conveyed by the first air pipeline (32) is conveyed to the burner (23) through the second air pipeline (22), the second gas pipeline (21) conveys gas to the burner (23), and the air and the gas are combusted at the burner (23) for heat supply;
And flue gas generated in the heating furnace sequentially passes through the heat storage component (12), the common pipeline (11) and the three-way valve (4) and is discharged through the flue gas pipeline (54) or the empty flue gas pipeline (31).
2. The heating furnace warming system according to claim 1, wherein: the heat storage units (1) are provided with at least two, and two ends of the three-way valve (4) are respectively connected with the shared pipelines (11) of the two heat storage units (1); when one heat storage unit (1) enters a heat storage period, the other heat storage unit (1) enters a heat release period;
the heat accumulation period is that the temperature of gas is higher than the temperature of a heat accumulator in the heat accumulation assembly (12), and the gas releases heat to the heat accumulator; the exothermic period is when the temperature of the gas is lower than the temperature of a heat accumulator in the heat accumulation assembly (12), and the heat accumulator releases heat to the gas.
3. The heating furnace warming system according to claim 1, wherein: the three-way valve (4) comprises a first three-way valve and a second three-way valve, the first three-way valve is respectively connected with the first gas pipeline (55) and the soot pipeline (54), and the second three-way valve is respectively connected with the first air pipeline (32) and the empty soot pipeline (31).
4. A heating furnace warming system according to claim 3, wherein: one end of the first three-way valve, which is close to the common pipeline (11), is provided with a gas reversing valve (41) and a soot reversing valve (42), and one end of the second three-way valve, which is close to the common pipeline (11), is provided with an air reversing valve (44) and an air reversing valve (43).
5. The heating furnace warming system according to claim 4, wherein: the gas reversing valve (41) and the soot reversing valve (42) are in an interlocking relationship, the air reversing valve (44) and the air reversing valve (43) are also in an interlocking relationship, and the interlocking relationship means that one side is opened and the other side is correspondingly closed.
6. The heating furnace warming system according to claim 1, wherein: the second gas pipeline (21) is provided with a gas quick-cutting valve (551), a gas blind plate valve (552) and a gas cut-off valve (553) in sequence.
7. A control method of a heating furnace heating system, applied to the heating furnace heating system according to any one of claims 1 to 6, characterized in that: the temperature in the heating furnace is a first stage at the room temperature to 600 ℃, a first control method is adopted, a second stage at the temperature of 600 ℃ to 750 ℃, a second control method is adopted, a third stage at the temperature of 750 ℃ to 1200 ℃, and a third control method is adopted;
the control method of the heating furnace temperature rising system comprises the following steps:
s1, judging a temperature interval of a stage of the temperature of a heating furnace, and selecting a control method of the corresponding temperature interval;
s2, heating the heating furnace according to the selected control method;
Wherein the first control method is to supply heat by using the non-heat storage unit (2); the second control method is to firstly utilize the non-heat storage unit (2) to supply heat, and when the temperature of the heating furnace is kept at a temperature (600 ℃ < a < 750 ℃) and the temperature of the heating furnace is not continuously increased, the heat storage unit (1) is opened, and at the moment, the heat storage unit (1) and the non-heat storage unit (2) supply heat together; the third control method supplies heat to the heat storage unit (1) and the non-heat storage unit (2) together.
8. The control method of a heating furnace temperature increasing system according to claim 7, characterized in that: the three-way valve (4) is provided with a gas reversing valve (41) and a soot reversing valve (42), and the gas reversing valve (41) and the soot reversing valve (42) are in an interlocking relationship; an air reversing valve (44) and an air-smoke reversing valve (43) are further arranged on the three-way valve (4), and the air reversing valve (44) and the air-smoke reversing valve (43) are in an interlocking relationship; the interlocking relationship means that one side is opened and the other side is correspondingly closed; the air conveyed by the first air pipeline (32) is input into the heat storage unit (1) through the air reversing valve (44), and the gas conveyed by the first gas pipeline (55) is input into the heat storage unit (1) through the gas reversing valve (41);
the first control method includes the steps of:
The method comprises the steps of firstly, respectively opening a second gas pipeline (21) and a first air pipeline (32) to provide gas and air for a combustor (23), so that the combustor (23) can normally burn and supply heat, and high-temperature flue gas generated after combustion exchanges heat in an air heat storage component (121);
And secondly, opening an air reversing valve (44) and an air-smoke reversing valve (43), and periodically and automatically reversing the air reversing valve (44) and the air-smoke reversing valve (43), wherein the gas reversing valve (41) and the coal-smoke reversing valve (42) are kept in a closed state, and the flue gas after heat exchange is discharged through the shared pipeline (11), the air-smoke reversing valve (43) and the air-smoke pipeline (31).
9. The control method of a heating furnace temperature increasing system according to claim 7, characterized in that: the two heat storage units (1) are arranged, and two ends of the three-way valve (4) are respectively connected with the shared pipelines (11) of the two heat storage units (1); when one heat storage unit (1) enters a heat storage period, the other heat storage unit (1) enters a heat release period at the same time; the heat accumulation period is that the temperature of gas is higher than the temperature of a heat accumulator in the heat accumulation assembly (12), and the gas releases heat to the heat accumulator; the heat release period is that the temperature of the gas is lower than the temperature of a heat accumulator in the heat accumulation assembly (12), and the heat accumulator releases heat to the gas;
The three-way valve (4) comprises a first three-way valve and a second three-way valve, the first three-way valve is respectively connected with the first gas pipeline (55) and the soot pipeline (54), and the second three-way valve is respectively connected with the first air pipeline (32) and the empty soot pipeline (31);
a gas reversing valve (41) and a soot reversing valve (42) are arranged at one end, close to the common pipeline (11), of the first three-way valve, and an air reversing valve (44) and an empty soot reversing valve (43) are arranged at one end, close to the common pipeline (11), of the second three-way valve;
The gas reversing valve (41) and the soot reversing valve (42) are in an interlocking relationship, the air reversing valve (44) and the air reversing valve (43) are also in an interlocking relationship, and the interlocking relationship means that one side is opened and the other side is correspondingly closed;
the second control method includes the steps of:
The first step, a second gas pipeline (21) and a first air pipeline (32) are respectively opened to supply gas and air to the burner (23), so that the burner (23) can normally burn and supply heat; the high-temperature flue gas generated after combustion exchanges heat in a heat storage unit (1) in a heat storage period until the temperature in a heating furnace reaches a (600 ℃ less than 750 ℃);
The second step, after the temperature in the heating furnace reaches a and does not rise any more, a second three-way valve is opened, so that an air reversing valve (44) and an air-smoke reversing valve (43) which are close to the two heat storage units (1) are periodically and automatically reversed, and then a first gas pipeline (55) is opened to convey gas to a gas heat storage component (122) in the heat storage units (1) in a heat release period; the first three-way valve is opened, so that the gas reversing valve (41) is kept in an open state all the time, the soot reversing valve (42) is kept in a closed state all the time, nitrogen purging and gas replacement are convenient to conduct, at the moment, the first gas pipeline (55) supplies gas to the gas heat storage component (122), and the second gas pipeline (21) supplies gas to the combustor (23); in the heating process, the air reversing valve (44) and the air-smoke reversing valve (43) are kept to carry out periodical automatic reversing, and the flue gas subjected to heat exchange and cooling is discharged through the air-smoke reversing valve (43).
10. The control method of a heating furnace temperature increasing system according to claim 7, characterized in that: the two heat storage units (1) are arranged, and two ends of the three-way valve (4) are respectively connected with the shared pipelines (11) of the two heat storage units (1); when one heat storage unit (1) enters a heat storage period, the other heat storage unit (1) enters a heat release period at the same time; the heat accumulation period is that the temperature of gas is higher than the temperature of a heat accumulator in the heat accumulation assembly (12), and the gas releases heat to the heat accumulator; the heat release period is that the temperature of the gas is lower than the temperature of a heat accumulator in the heat accumulation assembly (12), and the heat accumulator releases heat to the gas;
The three-way valve (4) comprises a first three-way valve and a second three-way valve, the first three-way valve is respectively connected with the first gas pipeline (55) and the soot pipeline (54), and the second three-way valve is respectively connected with the first air pipeline (32) and the empty soot pipeline (31);
a gas reversing valve (41) and a soot reversing valve (42) are arranged at one end, close to the common pipeline (11), of the first three-way valve, and an air reversing valve (44) and an empty soot reversing valve (43) are arranged at one end, close to the common pipeline (11), of the second three-way valve;
The gas reversing valve (41) and the soot reversing valve (42) are in an interlocking relationship, the air reversing valve (44) and the air reversing valve (43) are also in an interlocking relationship, and the interlocking relationship means that one side is opened and the other side is correspondingly closed;
the third control method includes the steps of:
the method comprises the steps of firstly, opening a first gas pipeline (55) to convey gas to a gas heat storage component (122), opening a second gas pipeline (21) to convey gas to a burner (23), and opening a first air pipeline (32) to convey air to an air heat storage component (121) and the burner (23); at the moment, the burner (23) burns normally to supply heat, one heat storage unit (1) enters a heat storage period, and the other heat storage unit (1) enters a heat release period;
Secondly, performing double reversing heat supply: opening an air reversing valve (44) and a gas reversing valve (41) which are connected with a heat storage unit (1) in a heat release period, opening an air smoke reversing valve (43) and a coal smoke reversing valve (42) which are connected with the heat storage unit (1) in the heat release period, exchanging heat of air and gas entering from a first air pipeline (32) and a first coal gas pipeline (55) in the heat storage unit (1) in the heat release period, burning the air and the coal gas to generate high-temperature flue gas, exchanging heat and cooling the high-temperature flue gas through the heat storage unit (1) in the heat storage period, and discharging the high-temperature flue gas through a first path and/or a second path sequentially; the first path is a common pipeline (11), an empty smoke reversing valve (43), an empty smoke pipeline (31), and the second path is a common pipeline (11), an empty smoke reversing valve (42), an empty smoke pipeline (54).
The air reversing valve (44), the gas reversing valve (41), the empty smoke reversing valve (43) and the soot reversing valve (42) are periodically and automatically reversed, namely, when the air reversing valve (44) and the gas reversing valve (41) are opened at one end of the first three-way valve and the second three-way valve, which are connected with the same heat storage unit (1), the empty smoke reversing valve (43) and the soot reversing valve (42) are opened at the other end of the first three-way valve and the second three-way valve.
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| CN202410155045.XA CN117968378A (en) | 2024-02-02 | 2024-02-02 | Heating furnace heating system and control method thereof |
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