CN111043869B - Heating furnace heat exchange and heat storage combined heat recovery system and operation method thereof - Google Patents
Heating furnace heat exchange and heat storage combined heat recovery system and operation method thereof Download PDFInfo
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- CN111043869B CN111043869B CN201911338836.1A CN201911338836A CN111043869B CN 111043869 B CN111043869 B CN 111043869B CN 201911338836 A CN201911338836 A CN 201911338836A CN 111043869 B CN111043869 B CN 111043869B
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- 238000005338 heat storage Methods 0.000 title claims abstract description 54
- 238000010438 heat treatment Methods 0.000 title claims abstract description 36
- 238000011084 recovery Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims description 15
- 239000007789 gas Substances 0.000 claims abstract description 182
- 239000003546 flue gas Substances 0.000 claims abstract description 106
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 105
- 239000003034 coal gas Substances 0.000 claims abstract description 22
- 239000000779 smoke Substances 0.000 claims abstract description 18
- 238000007599 discharging Methods 0.000 claims description 6
- 238000009825 accumulation Methods 0.000 claims description 4
- 238000005192 partition Methods 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 abstract description 9
- 230000002829 reductive effect Effects 0.000 abstract description 7
- 230000000717 retained effect Effects 0.000 abstract description 3
- 238000005260 corrosion Methods 0.000 abstract description 2
- 230000007797 corrosion Effects 0.000 abstract description 2
- 238000005336 cracking Methods 0.000 abstract description 2
- 230000036619 pore blockages Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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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
-
- 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
A heat exchange and heat storage combined type heat recovery system of a heating furnace comprises heat storage type air burners, a gas nozzle, a heat storage chamber, a gas preheater, a gas reversing valve, a gas preheater inlet flue gas reversing valve, a gas preheater outlet flue gas reversing valve, a gas pipeline and a flue gas pipeline. The flue gas discharged from the gas nozzle at the smoke discharge side flows into the gas preheater, exchanges heat with the gas from the gas main pipe in the gas preheater and then flows out, then flows into the heat storage chamber at the smoke discharge side, further releases heat in the heat storage chamber and then flows into the gas flue gas main pipe. The coal gas on the heat supply side preheated by the coal gas preheater flows into the heat storage chamber on the heat supply side, is further preheated in the heat storage chamber and is sprayed into the furnace through the coal gas nozzle. By adopting the technical scheme, the temperature of the flue gas entering the heat storage chamber and the concentration of particulate matters are reduced, the probability of secondary combustion of the retained gas can be effectively reduced, and the problems of burning, adhesion corrosion, cracking, deformation, pore blockage and the like of the heat storage body are effectively improved.
Description
Technical Field
The invention relates to a heating furnace heat exchange and heat storage combined heat recovery system and an operation method thereof, belonging to the field of heating furnace equipment and heat exchanger equipment.
Background
The double heat accumulating type heating furnace adopts the mode of alternate combustion and smoke exhaust on two sides of the heating furnace to supply heat to the furnace, and realizes the switching of air supply and air exhaust functions of the same burner by controlling the closing and opening of the reversing valve. When the gas reversing valve is reversed, gas is still filled in the space of the burner and the pipeline between the burner and the reversing valve due to the existence of residual gas pressure at the moment when the gas reversing valve is changed from gas supply to gas extraction, secondary combustion is generated at the moment when the gas is mixed with residual oxygen in high-temperature flue gas entering the burner after reversing, and a heat accumulator in the burner can generate phenomena of burning, adhesion corrosion, cracking, deformation, air hole blockage and the like at the high temperature of flame, so that the heat storage capacity is reduced, and the heat efficiency of a heat recovery system is reduced.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a heat recovery system combining heat exchange and heat storage of a heating furnace and an operation method thereof, which can effectively reduce the occurrence of secondary combustion in the heat recovery system while ensuring the heat recovery rate of the system.
The technical scheme adopted by the invention is as follows:
a heating furnace heat exchange and heat storage combined type heat recovery system comprises heat storage type air burners, a gas nozzle, a heat storage chamber, a gas preheater, a gas reversing valve, a gas preheater inlet flue gas reversing valve, a gas preheater outlet flue gas reversing valve, a gas pipeline and a flue gas pipeline; the heat accumulating type air burner and the gas nozzle are arranged on the furnace wall of the heating furnace in pairs; each gas nozzle is provided with a gas inlet of a regenerator gas preheater which is connected with a gas main pipe, a gas outlet of the gas preheater is connected with one end of a gas reversing valve through a gas pipeline, the other end of the gas reversing valve is connected with the gas inlets of regenerators at two sides of the wall of the heating furnace through the gas pipeline, and the gas outlets of the regenerators are connected with the gas nozzles through the gas pipeline. The flue gas outlet of the gas nozzle is connected with one end of a flue gas reversing valve at the inlet of the gas preheater through a flue gas pipeline, the other end of the flue gas reversing valve at the inlet of the gas preheater is connected to the flue gas inlet of the gas preheater through a flue gas pipeline, the flue gas outlet of the gas preheater is connected with one end of a flue gas reversing valve at the outlet of the gas preheater through a gas pipeline, the other end of the flue gas reversing valve at the outlet of the gas preheater is connected to the flue gas inlet of the regenerator through a flue gas pipeline, and the flue gas outlet of the.
Furthermore, the gas preheater belongs to a partition wall type heat exchanger, and gas and flue gas flow on two sides of the wall surface;
furthermore, the heat recovery system is suitable for a multi-section continuous heating furnace, and each heating section is provided with one set of the heat recovery system.
An operation method of a heating furnace heat exchange and heat storage combined type heat recovery system comprises the following steps:
in a reversing period, the side of the gas reversing valve connected with the heat storage chamber at the heat supply side of the hearth, the side of the gas reversing valve at the inlet of the gas preheater connected with the gas nozzle at the smoke exhaust side of the hearth, and the side of the gas reversing valve at the outlet of the gas preheater connected with the heat storage chamber at the smoke exhaust side of the hearth are simultaneously opened; when one reversing period is finished and is shifted to the next reversing period, the functions of the heat supply side and the smoke exhaust side are exchanged, one side of all reversing valves which are opened in the previous period is completely closed, and the other side of all reversing valves is completely opened;
the heat exchange process of the flue gas discharged by the air burner comprises the following steps: the flue gas discharged by the air burner at the smoke discharging side of the hearth is discharged into an air flue gas main pipe after the heat is released by the air burner;
the heat exchange process of the flue gas discharged from the gas nozzle is as follows: the flue gas discharged from the gas nozzle at the smoke discharging side of the hearth flows into the gas preheater through the flue gas pipeline and the gas reversing valve at the inlet of the gas preheater, flows out after exchanging heat with the gas from the gas main pipe in the gas preheater, flows into the heat storage chamber at the smoke discharging side through the flue gas pipeline and the gas reversing valve at the outlet of the gas preheater, further releases heat in the heat storage chamber, and flows into the gas main pipe through the flue gas pipeline.
Preheating process before air enters the furnace: air at the heat supply side of the hearth is preheated by a heat accumulating type air burner and then enters the furnace;
preheating process before coal gas enters the furnace: the gas preheated by the gas preheater flows into the heat storage chamber at the heat supply side through the gas pipeline and the gas reversing valve, is further preheated in the heat storage chamber, is sprayed into the furnace through the gas nozzle, and is mixed with air and combusted.
Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) after the two sides of the heating furnace are reversed, the flue gas is cooled by the gas preheater and then is mixed with the coal gas retained on the pipeline between the gas nozzle and the gas reversing valve.
(2) The heat recovery mode of combining the heat exchange and the heat storage of the flue gas is adopted, most of particles in the flue gas can be retained in the coal gas preheater, compared with the traditional double-heat-storage type heat recovery system, the blockage problem of a heat accumulator in a coal gas heat storage chamber can be effectively solved, the stability of gas airflow is improved, the combustion sufficiency in the furnace and the stability of a flow field are ensured, and the energy utilization rate and the heating quality of products are improved.
(3) The present technique for back-flushing fume can simultaneously achieve the purposes of inhibiting secondary combustion and raising fuel utilization rate, but it must increase high-power blower and pressure equipment, and its power consumption increase is very considerable.
Drawings
In order to more clearly illustrate the patented embodiments or technical solutions of the present invention in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other embodiments and drawings can be obtained according to the embodiments shown in the drawings without creative efforts.
FIG. 1: the invention discloses a local schematic diagram of a heating furnace heat exchange and heat storage combined heat recovery system
Wherein: 1-a heating furnace local furnace body, 2, 3-gas nozzles, 4, 5-air burners, 6, 7-a regenerator, 8-a gas preheater, 9-a gas reversing valve, 10-a gas preheater inlet flue gas reversing valve, 11-a gas preheater outlet flue gas reversing valve, 12, 13-a flue gas induced draft fan, 14, 15, 16, 17, 18-gas pipelines, and 19, 20, 21, 22, 23, 24, 25, 26-flue gas pipelines.
Detailed Description
A heat exchange and heat storage combined heat recovery system of a heating furnace is suitable for the heating furnace adopting a non-premixed combustion mode, namely air and coal gas are respectively sprayed into the heating furnace from respective nozzles. Referring to fig. 1, a schematic diagram of a part of the heat recovery system for heat exchange and heat storage is shown, and for a sectional heating furnace, one heat recovery system is adopted for each heating section. The heat recovery system is applied to preheating of low-calorific-value coal gas, and the preheating of air adopts a traditional heat accumulating type burner form. The heating furnace is divided into a side I and a side II, and the two sides are completely symmetrical. The gas nozzle 2 and the air burner 4 are arranged on the furnace wall of the heating furnace I side, and the gas nozzle 3 and the air burner 5 are arranged on the furnace wall of the heating furnace II side. The gas nozzle 2 at the side I is connected with the flue gas inlet at the side I of the inlet flue gas reversing valve 10 of the gas preheater through a flue gas pipeline 19, and the gas nozzle 3 at the side II is connected with the flue gas inlet at the side II of the inlet flue gas reversing valve 10 of the gas preheater through a flue gas pipeline 20. The flue gas outlet of the inlet flue gas reversing valve 10 of the gas preheater is connected to the flue gas inlet of the gas preheater 8 through a flue gas pipeline 21, and the flue gas outlet of the gas preheater 8 is connected to the flue gas inlet of the outlet flue gas reversing valve 11 of the gas preheater through a flue gas pipeline 22. The flue gas outlet at the side I of the flue gas reversing valve 11 at the outlet of the gas preheater is connected to the flue gas inlet of the heat storage chamber 6 through a flue gas pipeline 23, and the flue gas outlet at the side II of the flue gas reversing valve 11 at the outlet of the gas preheater is connected to the heat storage chamber 7 through a flue gas pipeline 24. The flue gas outlet of the heat storage chamber 6 is connected to a flue gas induced draft fan 12 through a flue gas pipeline 25, and the flue gas outlet of the heat storage chamber 7 is connected to a flue gas induced draft fan 13 through a flue gas pipeline 26. The gas inlet of the gas preheater 8 is connected with a gas main pipe, and the gas outlet is connected with the gas inlet of the gas reversing valve 9 through a gas pipeline 14. A gas outlet at the side I of the gas reversing valve 9 is connected to a gas inlet of the heat accumulation chamber 6 through a gas pipeline 15, and a gas outlet at the side II of the gas reversing valve 9 is connected to a gas inlet of the heat accumulation chamber 7 through a gas pipeline 16; the gas outlet of the heat storage chamber 6 is connected to the gas nozzle 2 through a gas pipeline 17, and the gas outlet of the heat storage chamber 7 is connected to the gas nozzle 3 through a gas pipeline 18.
The following describes specific embodiments of the present invention: the heat accumulating type heating furnace alternately supplies heat to two sides of a hearth, taking smoke exhaust from the side I of the hearth and heat supply from the side II as an example, at the moment, a smoke induced draft fan 12 operates, and a smoke induced draft fan 13 stops working; the side I of the gas reversing valve 9 is closed, the side II is opened, and the gas heat exchanger 8 is communicated with the heat accumulation chamber 7 through the gas reversing valve 9; the side I of a flue gas reversing valve 10 at the inlet of the coal gas preheater is opened, the side II of the flue gas reversing valve is closed, and a coal gas nozzle 2 is communicated with a coal gas preheater 8 through the flue gas reversing valve 10 at the inlet of the coal gas preheater; the side I of the gas preheater outlet flue gas reversing valve 11 is opened, the side II is closed, and the gas preheater 8 is communicated with the heat storage chamber 6 through the gas preheater outlet flue gas reversing valve 11. The flue gas is led out of the furnace from the nozzle 2, enters the gas preheater 8 through a flue gas pipeline 19, a flue gas reversing valve 10 at the inlet of the gas preheater and a flue gas pipeline 21, the high-temperature flue gas exchanges heat with low-temperature gas from a gas main pipe in the gas preheater 8, the flue gas with the reduced temperature enters the regenerator 6 through a flue gas pipeline 22, a flue gas reversing valve 11 at the outlet of the gas preheater and a flue gas pipeline 23, heat is further released in the regenerator 6, and the flue gas is discharged through a flue gas pipeline 25 under the action of an induced draft fan 12 after the temperature is reduced to a value slightly higher than a dew point temperature. The low-temperature coal gas is preheated to a certain temperature by high-temperature flue gas in a coal gas preheater 8, then enters a heat storage chamber 7 through a coal gas pipeline 14 and a coal gas pipeline 16 of a coal gas reversing valve 9, is further preheated to a higher temperature in the heat storage chamber, is sprayed into the furnace through a coal gas pipeline 18 and a coal gas nozzle 3, and is mixed with high-temperature air from an air nozzle and combusted.
Compared with the conventional heat accumulating type or heat exchange type heat recovery mode, the coal gas heat exchanger is added on the basis of the conventional heat accumulating type combustion, the probability of gas retention for secondary combustion can be effectively reduced, the service life of a heat accumulator and the energy utilization rate of a heating furnace are prolonged, and the expected effect of the technical scheme is achieved.
The above-mentioned examples only express the specific embodiments of the present invention, but should not be construed as limiting the scope of the present invention. Any modifications of the present invention which would occur to those skilled in the art and which are within the spirit of the invention are considered to be within the scope of the present invention.
Claims (4)
1. A heating furnace heat exchange and heat storage combined type heat recovery system is characterized by comprising heat storage type air burners, gas nozzles, a heat storage chamber, a gas preheater, a gas reversing valve, a gas preheater inlet flue gas reversing valve, a gas preheater outlet flue gas reversing valve, a gas pipeline and a flue gas pipeline; the heat accumulating type air burner and the gas nozzle are arranged on the furnace wall of the heating furnace in pairs; each gas nozzle is provided with a heat storage chamber; the gas inlet of the gas preheater is connected with a gas main pipe, the gas outlet of the gas preheater is connected with one end of a gas reversing valve through a gas pipeline, the other end of the gas reversing valve is connected with the gas inlets of the heat storage chambers on the two sides of the wall of the heating furnace through the gas pipeline, and the gas outlets of the heat storage chambers are connected to gas nozzles through the gas pipeline; the flue gas outlet of the gas nozzle is connected with one end of a flue gas reversing valve at the inlet of the gas preheater through a flue gas pipeline, the other end of the flue gas reversing valve at the inlet of the gas preheater is connected to the flue gas inlet of the gas preheater through a flue gas pipeline, the flue gas outlet of the gas preheater is connected with one end of a flue gas reversing valve at the outlet of the gas preheater through a gas pipeline, the other end of the flue gas reversing valve at the outlet of the gas preheater is connected to the flue gas inlet of the regenerator through a flue gas pipeline, and the flue gas outlet of the.
2. The heat recovery system combining heat exchange and heat storage of the heating furnace according to claim 1, wherein: the gas preheater belongs to a partition wall type heat exchanger, and gas and flue gas flow on two sides of the wall surface.
3. The utility model provides a heating furnace heat transfer and heat accumulation allies oneself with formula heat recovery system which characterized in that: the heat recovery system is suitable for a multi-section continuous heating furnace, and each heating section is provided with one set of the heat recovery system.
4. A method for operating a heat recovery system of combined heat exchange and heat storage type for a heating furnace using a heat recovery system of combined heat exchange and heat storage type according to any one of claims 1 to 3, comprising the steps of:
in a reversing period, the side of the gas reversing valve connected with the heat storage chamber at the heat supply side of the hearth, the side of the gas reversing valve at the inlet of the gas preheater connected with the gas nozzle at the smoke exhaust side of the hearth, and the side of the gas reversing valve at the outlet of the gas preheater connected with the heat storage chamber at the smoke exhaust side of the hearth are simultaneously opened; when one reversing period is finished and is shifted to the next reversing period, the functions of the heat supply side and the smoke exhaust side are exchanged, one side of all reversing valves which are opened in the previous period is completely closed, and the other side of all reversing valves is completely opened;
the heat exchange process of the flue gas discharged by the air burner comprises the following steps: the flue gas discharged by the air burner at the smoke discharging side of the hearth is discharged into an air flue gas main pipe after the heat is released by the air burner;
the heat exchange process of the flue gas discharged from the gas nozzle is as follows: the flue gas discharged from the gas nozzle at the smoke discharging side of the hearth flows into the gas preheater through the flue gas pipeline and the gas reversing valve at the inlet of the gas preheater, flows out after exchanging heat with the gas from the gas main pipe in the gas preheater, flows into the heat storage chamber at the smoke discharging side through the flue gas pipeline and the gas reversing valve at the outlet of the gas preheater, further releases heat in the heat storage chamber, and flows into the gas main pipe through the flue gas pipeline.
Preheating process before air enters the furnace: air at the heat supply side of the hearth is preheated by a heat accumulating type air burner and then enters the furnace;
preheating process before coal gas enters the furnace: the gas preheated by the gas preheater flows into the heat storage chamber at the heat supply side through the gas pipeline and the gas reversing valve, is further preheated in the heat storage chamber, is sprayed into the furnace through the gas nozzle, and is mixed with air and combusted.
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| CN114216347B (en) * | 2022-02-08 | 2022-09-30 | 北京科技大学 | Horizontal fast-frequency heat accumulating type high-pressure coal gas heating process |
| CN114777334B (en) * | 2022-05-25 | 2024-05-07 | 中冶赛迪工程技术股份有限公司 | Combined gas heating system and heating method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10533743B2 (en) * | 2015-06-18 | 2020-01-14 | Praxair Technology, Inc. | Thermochemical regeneration with soot formation |
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| CN2399693Y (en) * | 1999-12-09 | 2000-10-04 | 马鞍山钢铁股份有限公司 | Smoke bakc-blowing appts. of non-return heat accumulating industrial furnace |
| CN101285576A (en) * | 2007-05-22 | 2008-10-15 | 同济大学 | Low heat value burnt gas high-temperature air combustion system and method |
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