CN109099715B - A kind of recuperative heater for removing heat storage based on flue gas - Google Patents
A kind of recuperative heater for removing heat storage based on flue gas Download PDFInfo
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- CN109099715B CN109099715B CN201710474893.7A CN201710474893A CN109099715B CN 109099715 B CN109099715 B CN 109099715B CN 201710474893 A CN201710474893 A CN 201710474893A CN 109099715 B CN109099715 B CN 109099715B
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 239000003546 flue gas Substances 0.000 title claims abstract description 26
- 238000005338 heat storage Methods 0.000 title abstract 3
- 239000007789 gas Substances 0.000 claims abstract description 48
- 239000003034 coal gas Substances 0.000 claims abstract description 46
- 238000007664 blowing Methods 0.000 claims description 35
- 238000010438 heat treatment Methods 0.000 claims description 34
- 230000001172 regenerating effect Effects 0.000 claims description 19
- 238000010926 purge Methods 0.000 abstract description 10
- 239000002699 waste material Substances 0.000 abstract description 3
- 238000009792 diffusion process Methods 0.000 abstract 1
- 230000000505 pernicious effect Effects 0.000 abstract 1
- 239000000779 smoke Substances 0.000 description 20
- 238000000034 method Methods 0.000 description 11
- 238000002485 combustion reaction Methods 0.000 description 9
- 239000000446 fuel Substances 0.000 description 5
- 239000002918 waste heat Substances 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 2
- 239000002341 toxic gas Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
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- 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
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- 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
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
-
- 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
- F27D2017/007—Systems for reclaiming waste heat including regenerators
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air Supply (AREA)
Abstract
The invention discloses a kind of recuperative heaters that heat storage is removed based on flue gas, recuperative heater is in that time for stopping feeding coal gas and air, the flue gas of second port is introduced into the first port, purging removing is carried out to the residual coal gas in heat storage and associated conduit.Among recuperative heater remaining coal gas diffusion to atmosphere caused by not commutating when switching flow of flue gas direction, solves the problems, such as the technical waste of the problem of technical discharge of existing recuperative heater pernicious gas, serious pollution environment and more serious high-quality coal gas.
Description
Technical Field
The invention belongs to the technical field of energy conservation and emission reduction of regenerative heating furnaces, and particularly relates to a regenerative heating furnace based on a flue gas-cleaning heat accumulator.
Background
In the production of the steel industry and the building material industry, a large number of regenerative heating furnaces undertake heavy material heating tasks. The heat accumulating type heating furnace adopts a reversing combustion technology to realize high-temperature waste heat recovery and high-temperature preheating of low-heat value coal gas, the technology has the greatest advantages that the high-temperature waste heat (the smoke temperature is up to more than 1200 ℃) is efficiently recovered by using a small occupied area, the high-temperature preheating of the low-heat value coal gas (the preheating temperature is up to 900 ℃ -1000 ℃) is realized, taking a steel rolling heat accumulating type heating furnace as an example, the steel rolling heat accumulating type heating furnace generally adopts blast furnace gas (the CO content is 20% -30%) and converter gas (the CO content is 60% -80%), and the high-temperature smoke waste heat recovery principle is as follows: dozens of pairs of heat accumulators are symmetrically arranged on two sides of the heating furnace, when fuel and air are injected from one side (defined as side A) of the hearth, the fuel and the air are preheated to more than 900 ℃ by the high-temperature heat accumulator on the side, then enter the hearth of the heating furnace for combustion, the combustion products are discharged from the other side (defined as side B) of the hearth after exchanging heat with the billet, high-temperature smoke releases heat to the heat accumulators when passing through the heat accumulators on the side, and the heat accumulators are heated to high temperature (the highest temperature is more than 1000 ℃). After the operation for a period of time (generally about 90 s), the flowing direction of the coal gas and the flue gas is switched by the reversing valve, the fuel and the air are injected from the B side of the hearth, the flue gas is led out from the A side, and the high-temperature preheating of the low-heat-value fuel and the high-efficiency recovery of the waste heat of the high-temperature flue gas are realized in the continuous switching of the regenerative heating furnace.
However, this technique has a very serious technical drawback that during the reversing process of the regenerative heating furnace, the regenerator on one side of the burner is switched to a flue gas exhaust flue, and this switching will cause the residual gas in the pipe between the regenerator and the reversing valve on the side of the regenerator to be exhausted to the atmosphere. The defects of the technology are illustrated by taking a steel rolling regenerative heating furnace as an example:
1) each switching will result in a large emission of toxic gases into the atmosphere, resulting in very serious technical emissions of harmful gases (CO is highly toxic).
2) A certain amount of gas is discharged into the atmosphere without being combusted during each switching, so that the technical waste of high-quality gas fuel is caused.
Taking a certain medium-sized heating furnace as an example, the volume of each pair of heat accumulators and related pipelines is 0.3Nm3Each commutation will have 24Nm3The gas is diffused into the air, and 7603200Nm is generated every year3The coal gas is discharged into the atmosphere, and the calorific value is 1000Kcal/Nm3Converted into 1086.4 tons of standard coal, and calculated according to the CO content of 25 percent, 1900800Nm3The gas is discharged into the atmosphere, the toxic gas discharged by a heating furnace in a reversing way is equivalent to the CO of 1 breathed by everyone in a middle-sized city with 200 ten thousand population every year, and the pollution to the environment is obvious and surprised.
Disclosure of Invention
The invention aims to provide a regenerative heating furnace based on a flue gas-cleaning heat accumulator, aiming at solving the problem of coal gas emission in the reversing process of the regenerative heating furnace in the prior art.
The purpose of the invention is realized by the following technical scheme.
A regenerative heating furnace based on a flue gas-cleaning heat accumulator comprises: the furnace comprises a furnace body, a first four-way reversing valve, a second four-way reversing valve, a first three-way reversing valve and a second three-way reversing valve, wherein a first opening and a second opening are formed on one side of the furnace body, a third opening and a fourth opening are formed on the other side of the furnace body, the first opening is communicated with a first pipeline, the second opening is communicated with a second pipeline, the third opening is communicated with a third pipeline, the fourth opening is communicated with a fourth pipeline, and the first four-way reversing valve is respectively communicated with the first pipeline, the third pipeline, the fifth pipeline and the sixth pipeline so that the first pipeline is communicated with one of the fifth pipeline and the sixth pipeline and the third pipeline is communicated with the other of the fifth pipeline and the sixth pipeline; the second four-way reversing valve is respectively communicated with the second pipeline, the fourth pipeline, the seventh pipeline and the eighth pipeline, so that the second pipeline is communicated with one of the seventh pipeline and the eighth pipeline, and the fourth pipeline is communicated with the other of the seventh pipeline and the eighth pipeline; the first three-way reversing valve is respectively communicated with an air inlet pipeline, a first blowing pipeline and a fifth pipeline so that the fifth pipeline can be communicated with any one of the air inlet pipeline and the first blowing pipeline, wherein a first pressurizing machine is installed on the air inlet pipeline, the other port of the first blowing pipeline is communicated with the sixth pipeline, and a first fan is installed on the first blowing pipeline; the second three-way reversing valve is respectively communicated with the gas inlet pipeline, the second air blowing pipeline and the seventh pipeline so that the seventh pipeline can be communicated with any one of the gas inlet pipeline and the second air blowing pipeline, a second pressurizer is installed on the gas inlet pipeline, the other port of the second air blowing pipeline is communicated with the eighth pipeline, and a second fan is installed on the second air blowing pipeline;
and heat accumulators are arranged on the first opening, the second opening, the third opening and the fourth opening, so that gas passing through the first opening, the second opening, the third opening and the fourth opening can pass through the heat accumulators of the corresponding openings respectively.
In the above technical scheme, a first induced draft fan is installed on a sixth pipeline between the first blowing pipeline and the first four-way reversing valve.
In the above technical scheme, a second induced draft fan is installed on the eighth pipeline between the second blowing pipeline and the second four-way reversing valve.
In the above technical solution, a chimney is fixedly mounted at each of the ports of the sixth pipeline and the eighth pipeline.
The use method of the regenerative heating furnace comprises the following steps:
1) adjusting the first three-way reversing valve and the second three-way reversing valve to enable the fifth pipeline to be communicated with the air inlet pipeline, and enabling the seventh pipeline to be communicated with the coal gas inlet pipeline;
2) adjusting the first four-way reversing valve to enable the first pipeline to be communicated with the fifth pipeline, and the sixth pipeline to be communicated with the third pipeline; adjusting the second four-way reversing valve to enable the second pipeline to be communicated with the seventh pipeline, enable the fourth pipeline to be communicated with the eighth pipeline, and start a first pressurizing machine and a second pressurizing machine to enable coal gas and air to be respectively introduced into the corresponding coal gas inlet pipeline and air inlet pipeline;
3) switching the flow direction of the flue gas (the flue gas is mixed with coal gas): stopping introducing coal gas and air into the corresponding coal gas inlet pipeline and the corresponding air inlet pipeline respectively, closing the first pressurizing machine and the second pressurizing machine, adjusting the first three-way reversing valve and the second three-way reversing valve to enable the fifth pipeline to be communicated with the first blowing pipeline, and enabling the seventh pipeline to be communicated with the second blowing pipeline; starting a first fan and a second fan, and closing the first fan and the second fan after keeping for N seconds;
4) adjusting the first three-way reversing valve and the second three-way reversing valve to enable the fifth pipeline to be communicated with the air inlet pipeline, and enabling the seventh pipeline to be communicated with the coal gas inlet pipeline; adjusting the first four-way reversing valve to enable the first pipeline to be communicated with the sixth pipeline, and the fifth pipeline to be communicated with the third pipeline; and adjusting the second four-way reversing valve to enable the second pipeline to be communicated with the eighth pipeline, the fourth pipeline to be communicated with the seventh pipeline, and starting the first pressurizing machine and the second pressurizing machine to enable coal gas and air to be respectively introduced into the corresponding coal gas inlet pipeline and air inlet pipeline.
In the above technical solution, N is less than or equal to 600 seconds.
Compared with the prior art, the heat accumulating type heating furnace has the beneficial effects that:
residual coal gas caused by no reversing is diffused into the atmosphere when the flow direction of the flue gas is switched by the heat accumulating type heating furnace, so that the problems of technical emission of harmful gas and serious environmental pollution of the existing heat accumulating type heating furnace and the technical waste problem of high-quality coal gas are solved.
Drawings
FIG. 1 is a schematic view of the operating state of a regenerative heating furnace according to the present invention;
FIG. 2 is a schematic view of the regenerative heating furnace according to the present invention in a purging state;
fig. 3 is a schematic view of the working state of the regenerative heating furnace after the switching is completed.
Wherein,
1: second opening 2: first opening 3: a furnace body 4: flame(s)
5: fourth opening 6: third opening 7: second press
8: the second three-way change valve 9: a chimney 10: second induced draft fan
11: second four-way selector valve 12: first four-way selector valve 13: first induced draft fan
14: first three-way selector valve 15: first piping 16: first press
17: the second fan 18: first fan 19: second pipeline
20: fifth pipe line 21: sixth pipeline 22 third pipeline
23: seventh pipe line 24: fourth pipe line 25: eighth pipeline
26: intake air pipe 27: first blowing line 28: gas inlet pipeline
29: a second blowing line.
Detailed Description
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships conventionally placed when the present invention is used, are only used for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
A method for removing heat accumulators in a heat accumulating type heating furnace and reversing residual coal gas in corresponding pipelines by utilizing smoke comprises the following steps:
firstly, introducing coal gas and combustion-supporting air into a furnace body through a first air port on the furnace body, combusting the coal gas and the air in the furnace body to form smoke, and discharging the smoke out of the furnace body through a second air port on the furnace body;
stopping introducing coal gas and air into the furnace body, introducing the flue gas exhausted by the second air port into the furnace body from the first air port, and keeping N seconds, wherein N is less than or equal to 600 seconds; (at the moment of stopping the supply of the gas and the air, the flue gas of the second gas port is introduced into the first gas port, and the residual gas in the heat accumulator and the related pipelines is swept and removed).
Preferably, in the second step, the flue gas is introduced into the furnace body under pressure.
Thirdly, introducing coal gas and air into the furnace body again: the coal gas and the air enter the furnace body through the second air port, the coal gas and the air are combusted in the furnace body to form smoke, and the smoke is discharged out of the furnace body through the first air port on the furnace body;
wherein, the quantity of first gas port is at least 1, and the quantity of second gas port is at least 1, all installs the heat accumulator on first gas port and the second gas port.
And after the step III, repeating the steps I to III.
The above method can be implemented by the regenerative heating furnace described below. As shown in fig. 1 to 3, the device comprises: a furnace body 3, a first four-way reversing valve 12, a second four-way reversing valve 11, a first three-way reversing valve 14 and a second three-way reversing valve 8, a first opening 2 and a second opening 1 (corresponding to a first gas port in the method) are formed on one side of the furnace body 3, a third opening 6 and a fourth opening 5 (corresponding to a second gas port in the method) are formed on the other side of the furnace body 3, the first opening 2 is communicated with the first pipeline 15, the second opening 1 is communicated with the second pipeline 19, the third opening 6 is communicated with the third pipeline 22, the fourth opening 5 is communicated with the fourth pipeline 24, the first four-way reversing valve 12 is respectively communicated with the first pipeline 15, the third pipeline 22, the fifth pipeline 20 and the sixth pipeline 21, so that the first line 15 communicates with one of the fifth and sixth lines 20, 21 and the third line 22 communicates with the other of the fifth and sixth lines 20, 21; the second four-way selector valve 11 is respectively communicated with a second pipeline 19, a fourth pipeline 24, a seventh pipeline 23 and an eighth pipeline 25, so that the second pipeline 19 is communicated with one of the seventh pipeline 23 and the eighth pipeline 25, and the fourth pipeline 24 is communicated with the other of the seventh pipeline 23 and the eighth pipeline 25; the first three-way reversing valve 14 is respectively communicated with the air inlet pipeline 26, the first blowing pipeline 27 and the fifth pipeline 20, so that the fifth pipeline 20 can be communicated with any one of the air inlet pipeline 26 and the first blowing pipeline 27, wherein the air inlet pipeline 26 is provided with a first pressurizing machine 16, the other port of the first blowing pipeline 27 is communicated with the sixth pipeline 21, and the first blowing pipeline 27 is provided with a first fan 18; the second three-way reversing valve 8 is respectively communicated with the coal gas inlet pipeline 28, the second air blowing pipeline 29 and the seventh pipeline 23, so that the seventh pipeline 23 can be communicated with any one of the coal gas inlet pipeline 28 and the second air blowing pipeline 29, wherein the coal gas inlet pipeline 28 is provided with a second pressurizer 7, the other port of the second air blowing pipeline 29 is communicated with the eighth pipeline 25, and the second air blowing pipeline 29 is provided with a second fan 17;
the first opening 2, the second opening 1, the third opening 6 and the fourth opening 5 are all provided with heat accumulators, so that gas passing through the first opening 2, the second opening 1, the third opening 6 and the fourth opening 5 can pass through the heat accumulators of the corresponding openings respectively.
Preferably, a first induced draft fan 13 is installed on the sixth pipeline 21 between the first induced draft pipeline 27 and the first four-way selector valve 12.
Preferably, a second induced draft fan 10 is installed on the eighth pipeline 25 between the second blowing pipeline 29 and the second four-way selector valve 11.
Preferably, the ports of the sixth pipe 21 and the eighth pipe 25 are respectively provided with a chimney 9.
The use method of the regenerative heating furnace comprises the following steps:
1) adjusting the first three-way reversing valve 14 and the second three-way reversing valve 8 to enable the fifth pipeline 20 to be communicated with an air inlet pipeline 26, and enabling the seventh pipeline 23 to be communicated with a coal gas inlet pipeline 28;
2) adjusting the first four-way selector valve 12 to communicate the first line 15 with the fifth line 20 and the sixth line 21 with the third line 22; adjusting the second four-way reversing valve 11 to enable the second pipeline 19 to be communicated with the seventh pipeline 23, the fourth pipeline 24 to be communicated with the eighth pipeline 25, and starting the first pressurizing machine 16 and the second pressurizing machine 7 to enable coal gas and air to be respectively introduced into a corresponding coal gas inlet pipeline 28 and an air inlet pipeline 26;
3) switching the flow direction of the flue gas: stopping the gas and air from flowing into the corresponding gas inlet pipeline 28 and air inlet pipeline 26 respectively, closing the first pressurizing machine 16 and the second pressurizing machine 7, adjusting the first three-way reversing valve 14 and the second three-way reversing valve 8, and enabling the fifth pipeline 20 to be communicated with the first blowing pipeline 27 and the seventh pipeline 23 to be communicated with the second blowing pipeline 29; starting the first fan 18 and the second fan 17, keeping the first fan 18 and the second fan 17 off after N seconds; n is less than or equal to 600 seconds.
4) Adjusting the first three-way reversing valve 14 and the second three-way reversing valve 8 to enable the fifth pipeline 20 to be communicated with an air inlet pipeline 26, and enabling the seventh pipeline 23 to be communicated with a coal gas inlet pipeline 28; adjusting the first four-way selector valve 12 to communicate the first line 15 with the sixth line 21 and the fifth line 20 with the third line 22; the second four-way selector valve 11 is adjusted to connect the second line 19 to the eighth line 25 and the fourth line 24 to the seventh line 23, and the first and second pressurizing machines 16 and 7 are turned on to supply gas and air to the gas supply line 28 and the air supply line 26, respectively.
Repeating steps 1) to 4).
The technical scheme of the invention is further explained by combining specific examples.
Referring to fig. 1, at a certain time, the left side of the regenerative heating furnace is a combustion side, gas and combustion-supporting air are injected from a first opening (gas inlet) and a second opening (air inlet) of a hearth of the heating furnace, and heat accumulators positioned at the first opening and the second opening release heat to the gas and the air to preheat the corresponding air and the gas. The right side of the regenerative heating furnace is a flue gas discharge side, namely a high-temperature flue gas waste heat recovery side, and after the high-temperature flue gas releases heat to the heat accumulator (on the right side in the figure), the flue gas is led out from a third opening and a fourth opening on the right side of the furnace body.
Position of the diverter valve at this time: the second three-way reversing valve 8 is in a gas connection position, the second four-way reversing valve 11 is in a position which can enable the second opening 1 to be connected with gas, namely the gas inlet pipeline 28 is communicated with the seventh pipeline 23, and the seventh pipeline 23 is communicated with the second pipeline 19; at this time, the fourth pipeline is communicated with the eighth pipeline, so that the second induced draft fan 10 is communicated with the fourth opening 5. The first three-way reversing valve 14 is in a position communicated with air, the first four-way reversing valve 12 is in a position communicated with a first opening, namely, an air inlet pipeline is communicated with a fifth pipeline, and a fifth pipeline 20 is communicated with the first pipeline 15; at this time, the sixth pipeline 21 communicates with the third pipeline 22, and the first induced draft fan 13 communicates with the third opening.
A coal gas flow path: after being pressurized by the second pressurizer 7, the coal gas enters the second three-way reversing valve 8, continues to flow through the second four-way reversing valve 11, then enters the second opening 1 through the second pipeline 19 and passes through the heat accumulator at the second opening, and the coal gas and the heat accumulator perform heat exchange and rise in temperature to be sprayed into the furnace body 3 for combustion to generate flame 4.
Combustion air flow: air is pressurized by a first pressurizer 16, enters a first three-way reversing valve 14, flows through a first four-way reversing valve 12, enters a first opening 2 through a first pipeline 15, exchanges heat with a heat accumulator at the first opening to heat, and then enters a furnace body 3 to support combustion.
Flue gas flow: the coal gas and the combustion-supporting air are combusted to form 4 flames, smoke formed by the flames 4 flows out of the fourth opening 5 and the third opening respectively and flows into the chimney 9 through the heat accumulators of the corresponding openings, the third pipeline and the fourth pipeline respectively and the corresponding second four-way reversing valve 11 and the first four-way reversing valve 12, and power for flowing of the smoke is from the second induced draft fan 10 and the first induced draft fan 13 respectively.
Referring to fig. 2, after the regenerative heating furnace is operated for a period of time, the combustion side and the flue gas exhaust side need to be reversed, that is, the flow direction of the flue gas is switched. When the reversing starts, the second three-way reversing valve 8 and the first three-way reversing valve 14 are simultaneously switched to be communicated with the second fan 17 and the first fan 18 respectively, namely the fifth pipeline is communicated with the first blowing pipeline, and the seventh pipeline is communicated with the second blowing pipeline. At this time, the flue gas respectively purges residual gas accumulated in the heat accumulator at the second opening 1, the second four-way reversing valve 11 and the connecting pipeline thereof, and residual air accumulated in the heat accumulator at the first four-way reversing valve 12, the first opening 2 and the connecting pipeline thereof under the pressurization action of the second fan 17 and the first fan 18, and the coal gas and the air entering the furnace body 3 after purging completely combust in the furnace body.
Referring to fig. 3, at the moment when the residual gas is completely blown into the hearth, the second three-way reversing valve 8 is switched to the gas connection state, the first three-way reversing valve 14 is switched to the air connection state, namely, the fifth pipeline is communicated with the air inlet pipeline, and the seventh pipeline is communicated with the gas inlet pipeline. The second four-way selector valve 11 and the first four-way selector valve 12 are reversed: the first pipeline is communicated with the sixth pipeline, and the fifth pipeline is communicated with the third pipeline; the second pipeline is communicated with the eighth pipeline, and the fourth pipeline is communicated with the seventh pipeline. And the heat accumulating type heating furnace is switched to a state of burning at the right side and leading out smoke at the left side, and the switching is completed. Typically, the purge time does not exceed 3 seconds. After the switching is finished, coal gas and air enter the furnace body from the third opening and the fourth opening to be combusted, and smoke is discharged from the first opening and the second opening.
The invention improves the structure of the original reversing system, improves the control scheme of the reversing process, and performs pulse purging on residual coal gas in a heat accumulator and related pipelines during reversing by using pressurized pulse flue gas.
1) Structural improvement of reversing system
A second three-way reversing valve and a first three-way reversing valve are respectively and newly arranged before coal gas and air enter an original reversing valve, through-flow switching between smoke and the coal gas is realized by the second three-way reversing valve, through-flow switching between the smoke and the air is realized by the first three-way reversing valve, and meanwhile, a smoke pulse fan, namely a first induced draft fan and a second induced draft fan, is respectively arranged on a smoke channel.
2) Improvements to control schemes for commutation processes
The basic strategy after the control scheme is improved is as follows: after the reversing is started, firstly, the supply of gas and air on the left side of the furnace body is cut off, but the right side smoke gas discharge state is kept, then, a smoke gas purging system is opened, high-temperature smoke gas is extracted from a flue by a pulse fan to purge residual gas of heat accumulators of the first opening and the second opening and corresponding pipelines, after purging is finished, the purging system is closed, the right side of the furnace body is switched to a combustion state (a gas and air connection state), and the left side of the furnace body is switched to a smoke discharge state. Note: the above "left" and "right" may be opposite sides or may not be opposite sides.
The invention has been described in an illustrative manner, and it is to be understood that any simple variations, modifications or other equivalent changes which can be made by one skilled in the art without departing from the spirit of the invention fall within the scope of the invention.
Claims (1)
1. The utility model provides a regenerative heating furnace based on heat accumulator is clear away to flue gas which characterized in that includes: furnace body (3), first four-way reversing valve (12), second four-way reversing valve (11), first three-way reversing valve (14) and second three-way reversing valve (8) one side of furnace body (3) is formed with first opening (2) and second opening (1), the opposite side of furnace body (3) is formed with third opening (6) and fourth opening (5), first opening (2) intercommunication has first pipeline (15), second opening (1) intercommunication has second pipeline (19), third opening (6) intercommunication has third pipeline (22), fourth opening (5) intercommunication has fourth pipeline (24), first four-way reversing valve (12) communicate respectively first pipeline (15), third pipeline (22), fifth pipeline (20) and sixth pipeline (21), so that first pipeline (15) with pipeline in fifth pipeline (20) and the sixth pipeline (21) communicate just third pipeline (22) and sixth pipeline (21) communicate The fifth pipeline (20) is communicated with the other pipeline in the sixth pipeline (21); the second four-way reversing valve (11) is communicated with the second pipeline (19), the fourth pipeline (24), the seventh pipeline (23) and the eighth pipeline (25) respectively, so that the second pipeline (19) is communicated with one of the seventh pipeline (23) and the eighth pipeline (25), and the fourth pipeline (24) is communicated with the other of the seventh pipeline (23) and the eighth pipeline (25); the first three-way reversing valve (14) is communicated with an air inlet pipeline (26), a first air blowing pipeline (27) and a fifth pipeline (20) respectively, so that the fifth pipeline (20) can be communicated with any one of the air inlet pipeline (26) and the first air blowing pipeline (27), wherein a first pressurizer (16) is installed on the air inlet pipeline (26), the other port of the first air blowing pipeline (27) is communicated with the sixth pipeline (21), and a first fan (18) is installed on the first air blowing pipeline (27); the second three-way reversing valve (8) is respectively communicated with a coal gas inlet pipeline (28), a second air blowing pipeline (29) and a seventh pipeline (23), so that the seventh pipeline (23) can be communicated with any one of the coal gas inlet pipeline (28) and the second air blowing pipeline (29), wherein a second pressurizer (7) is installed on the coal gas inlet pipeline (28), the other port of the second air blowing pipeline (29) is communicated with the eighth pipeline (25), and a second fan (17) is installed on the second air blowing pipeline (29);
heat accumulators are mounted on the first opening (2), the second opening (1), the third opening (6) and the fourth opening (5), so that gas passing through the first opening (2), the second opening (1), the third opening (6) and the fourth opening (5) can pass through the heat accumulators of the corresponding openings respectively; and a chimney (9) is respectively arranged at the ports of the sixth pipeline (21) and the eighth pipeline (25).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710474893.7A CN109099715B (en) | 2017-06-21 | 2017-06-21 | A kind of recuperative heater for removing heat storage based on flue gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710474893.7A CN109099715B (en) | 2017-06-21 | 2017-06-21 | A kind of recuperative heater for removing heat storage based on flue gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109099715A CN109099715A (en) | 2018-12-28 |
| CN109099715B true CN109099715B (en) | 2019-10-08 |
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| CN201710474893.7A Expired - Fee Related CN109099715B (en) | 2017-06-21 | 2017-06-21 | A kind of recuperative heater for removing heat storage based on flue gas |
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| CN113945097B (en) * | 2020-07-16 | 2024-05-31 | 河北中科智源新材料技术有限公司 | Method for cooperatively removing mixed smoke CO and NOx of double-smoke replacement heat accumulating type heating furnace |
| CN113945098B (en) * | 2020-07-16 | 2024-05-31 | 河北中科智源新材料技术有限公司 | Method for cooperatively removing CO and NOx mixed in soot replacement heat accumulating type heating furnace |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002286204A (en) * | 2001-03-27 | 2002-10-03 | Tokyo Gas Co Ltd | Reduction combustion mechanism and reduction combustion method in regenerative burner system |
| CN104791777A (en) * | 2015-04-09 | 2015-07-22 | 上海嘉德环境能源科技有限公司 | Combustion method for reducing NOx by adopting self-circulation of flue gas |
| CN206192135U (en) * | 2016-08-23 | 2017-05-24 | 苏州云白环境设备股份有限公司 | Regenerative heating furnace controlling means that commutates |
| CN206803784U (en) * | 2017-06-21 | 2017-12-26 | 华北理工大学 | The recuperative heater of heat storage is removed based on flue gas |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002286204A (en) * | 2001-03-27 | 2002-10-03 | Tokyo Gas Co Ltd | Reduction combustion mechanism and reduction combustion method in regenerative burner system |
| CN104791777A (en) * | 2015-04-09 | 2015-07-22 | 上海嘉德环境能源科技有限公司 | Combustion method for reducing NOx by adopting self-circulation of flue gas |
| CN206192135U (en) * | 2016-08-23 | 2017-05-24 | 苏州云白环境设备股份有限公司 | Regenerative heating furnace controlling means that commutates |
| CN206803784U (en) * | 2017-06-21 | 2017-12-26 | 华北理工大学 | The recuperative heater of heat storage is removed based on flue gas |
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| CN109099715A (en) | 2018-12-28 |
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Inventor after: Wang Zibing Inventor after: Zhang Yuzhu Inventor after: Xing Hongwei Inventor after: Wang Yizhu Inventor after: Liu Chao Inventor before: Wang Zibing Inventor before: Zhang Yuzhu Inventor before: Xing Hongwei Inventor before: Wang Yizhu |
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