CN113720016A - Gas heating method and heat accumulating type gas heating system - Google Patents
Gas heating method and heat accumulating type gas heating system Download PDFInfo
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- CN113720016A CN113720016A CN202110964729.0A CN202110964729A CN113720016A CN 113720016 A CN113720016 A CN 113720016A CN 202110964729 A CN202110964729 A CN 202110964729A CN 113720016 A CN113720016 A CN 113720016A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 129
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000007789 gas Substances 0.000 claims abstract description 92
- 238000002485 combustion reaction Methods 0.000 claims abstract description 42
- 239000003034 coal gas Substances 0.000 claims abstract description 35
- 239000003546 flue gas Substances 0.000 claims abstract description 21
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 20
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 9
- 238000009825 accumulation Methods 0.000 claims description 25
- 230000001172 regenerating effect Effects 0.000 claims description 15
- 238000009792 diffusion process Methods 0.000 claims description 13
- 238000010926 purge Methods 0.000 claims description 13
- 238000005338 heat storage Methods 0.000 claims description 10
- 239000011261 inert gas Substances 0.000 claims description 5
- 239000011819 refractory material Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 229910052755 nonmetal Inorganic materials 0.000 claims description 2
- 238000001556 precipitation Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H7/00—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release
- F24H7/02—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/0052—Details for air heaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2064—Arrangement or mounting of control or safety devices for air heaters
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air Supply (AREA)
Abstract
The invention belongs to the technical field of industrial gas heating, and relates to a gas heating method and a heat accumulating type gas heating system, wherein a heat accumulating type gas heating system is adopted to heat cold gas, the heating process of the heat accumulating type heating furnace comprises a heat accumulating period and a heat releasing period, and the heat accumulating period and the heat releasing period alternately and circularly operate; and controlling at least 1 heat accumulating type heating furnace in the heat accumulating type gas heating system to be in a heat release period in the alternate circulation process, thereby continuously heating cold gas; the heat accumulating type gas heating system comprises a heat accumulating type heating furnace, a combustion medium pipeline, a combustion-supporting air pipeline, a cold gas pipeline, a hot gas pipeline and a flue gas pipeline, wherein a heat accumulator is arranged in the heat accumulating type heating furnace, and a temperature measuring device is arranged in the heat accumulating type heating furnace. The invention adopts the heat accumulator to realize indirect heating of the coal gas, solves the problem of carbon precipitation of CO in the coal gas heating process, simultaneously improves the heating efficiency, can effectively heat the coal gas to more than 950 ℃ or even higher, and has lower investment cost.
Description
Technical Field
The invention belongs to the technical field of industrial gas heating, and relates to a gas heating method and a heat accumulating type gas heating system.
Background
At present, the device for heating gas in the industrial field is mainly a shell and tube gas heating furnace, and the device mainly has the following problems:
1. the shell and tube gas heating furnace belongs to a dividing wall type heat exchange device, heating gas continuously flows in a tube, carbon precipitation reaction can be generated between 300 ℃ and 700 ℃, carbon precipitated from CO gas is attached to the tube wall and gradually accumulated, the heat transfer effect can be seriously influenced after long-term operation, and great adverse effect is brought to the operation of equipment.
2. The tube array material of the tube array type gas heating furnace is mainly various steel materials, is limited by the heat-resistant temperature of the steel materials, and in order to increase the gas temperature as much as possible, heat-resistant stainless steel with higher temperature-resistant grade is needed, so that the cost of the heating furnace is greatly increased, and even if the temperature of the heating gas is difficult to exceed 800 ℃, the use requirement of the subsequent process is difficult to meet.
Disclosure of Invention
In view of the above, the present invention provides a gas heating method and a regenerative gas heating system to solve the above-mentioned gas heating defects.
In order to achieve the purpose, the invention provides the following technical scheme:
a heat accumulating type gas heating system comprises a heat accumulating type heating furnace, a combustion medium pipeline, a combustion air pipeline, a cold gas pipeline, a hot gas pipeline and a flue gas pipeline, wherein heat accumulators are arranged in the heat accumulating type heating furnace, at least 2 heat accumulating type heating furnaces are arranged in parallel, and the combustion medium pipeline, the combustion air pipeline, the cold gas pipeline and the hot gas pipeline are all communicated with the heat accumulating type heating furnace.
Furthermore, the combustion air pipeline, the combustion medium pipeline, the flue gas pipeline and the cold gas pipeline are all provided with a diffusion pipeline; and control valves are arranged on the combustion medium pipeline, the combustion air pipeline, the cold gas pipeline and the flue gas pipeline at the positions on two sides of the diffusion pipeline. Because the control valve can not be completely sealed, the leakage rate is certain, and the leaked gas is discharged through the diffusion pipeline.
Furthermore, a control valve is also arranged on the hot gas pipeline.
Furthermore, purging pipelines are arranged on the combustion air pipeline and the combustion medium pipeline.
Furthermore, the inner linings of the heat accumulator and the heat accumulating type heating furnace are made of non-metal refractory materials.
Furthermore, temperature measuring devices are arranged in the heat accumulating type heating furnace at intervals in a layered mode along the vertical direction, and the number of the temperature measuring devices is at least 2. The temperature in the regenerative heating furnace is detected through the temperature measuring device, the temperature in the furnace is controlled according to temperature feedback, and the heating period and the heat storage period are switched according to the temperature in the furnace.
The gas heating method adopts the heat accumulating type gas heating system to heat cold gas, the heating process of the heat accumulating type heating furnace comprises a heat accumulation period and a heat release period, and the heat accumulation period and the heat release period alternately and circularly run; and controlling at least 1 heat accumulating type heating furnace in the heat accumulating type gas heating system to be in a heat release period in the alternate circulation process, thereby continuously heating cold gas;
the heat storage period is as follows: inputting a combustion medium and combustion-supporting air into a regenerative heating furnace for combustion, heating a heat accumulator by using generated high-temperature flue gas, stopping inputting the combustion medium and the combustion-supporting air when the heat accumulator is heated to a set target temperature, and ending a heat accumulation period;
the exothermic period is as follows: inputting cold coal gas into a regenerative heating furnace, heating the cold coal gas by heat energy released by a heat accumulator, and outputting the cold coal gas from a hot coal gas pipeline after the cold coal gas is heated to a target temperature; and when the temperature of the heated coal gas is lower than the target temperature, ending the heat release period.
Further, when the heat accumulation period and the heat release period are finished, inert gas is introduced into the heat accumulation type heating furnace through a purging pipeline for purging, and residual gas is discharged; when the regenerative heating furnace is switched to the heat release period from the heat storage period, the purging pipeline is opened, the regenerative heating furnace is purged once by inert gases such as nitrogen, and then the furnace replacement can be completed. When the gas heating furnace is switched to the heat storage period from the heating period, the diffusing pipelines on the combustion medium pipeline, the combustion-supporting air pipeline and the flue gas pipeline are opened, and the residual gas in the heat storage type heating furnace is diffused to the air, so that the safety is ensured.
Further, in the heat accumulation period, the temperature in the heat accumulation type heating furnace is controlled to be not lower than 400 ℃, and carbon separated out in the CO heating process of the coal gas in the heat release period is burnt and removed by utilizing the temperature in the heat accumulation type heating furnace in the heat accumulation period.
Further, in the heat storage period, opening a diffusion pipeline on a cold gas pipeline of the heating furnace, and diffusing the gas leaked from the cold gas pipeline to the air; in the heat release period, the diffusing pipelines on the combustion medium pipeline, the combustion-supporting air pipeline and the flue gas pipeline of the heating furnace are opened, and the gas leaked from the heat accumulating type heating furnace is diffused to the air. Because the pipeline is opened and closed by adopting the control valve, the control valve can not be completely sealed usually, has a certain leakage rate, and is diffused to the air through the diffusing pipeline in order to prevent the leaked coal gas from gathering to generate potential safety hazard.
The invention has the beneficial effects that:
1. the invention adopts the heat accumulator as a heat storage and release medium, heats the coal gas by an indirect heating mode, can heat the heat accumulator made of refractory materials to a higher temperature, can bear the temperature of more than 1200 ℃ compared with the traditional dividing wall type heating, can effectively heat the coal gas to more than 950 ℃ or even higher, and has lower investment cost.
2. Aiming at the problem of carbon evolution of CO in the coal gas heating process, the invention utilizes the high temperature generated by the combustion medium in the heat accumulation period and oxygen brought by combustion-supporting air to burn and remove the carbon evolved, thereby avoiding accumulation on the heat accumulator and effectively solving the problem of carbon evolution.
3. According to the invention, the release pipeline is arranged between the two control valves, so that gas leaked from the control valves is released to the air, and potential safety hazards caused by incomplete sealing of the control valves are solved.
4. The invention adopts the heat accumulator to heat the coal gas, does not change the components of the coal gas in the process of heating the coal gas, and is beneficial to the utilization of the subsequent process.
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 objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
fig. 1 is a layout diagram of a heat accumulating type gas heating system in the invention;
fig. 2 is a schematic view of a regenerative heating furnace.
Reference numerals: 1-a combustion air conduit; 2-flue gas pipeline; 3-a cold gas pipeline; 4-a combustion medium conduit; 5-a regenerative heating furnace; 6-hot gas pipeline; 7-purging the pipeline; 8-a diffusing pipeline; 9-temperature measuring device.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood 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 numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1 to 2, a heat accumulating type gas heating system includes a heat accumulating type heating furnace 5, a combustion medium pipeline 4, a combustion air pipeline 1, a cold gas pipeline 3, a hot gas pipeline 6, and a flue gas pipeline 2, wherein a heat accumulator is disposed in the heat accumulating type heating furnace 5, 2 heat accumulating type heating furnaces 5 are disposed in parallel, the combustion medium pipeline 4, the combustion air pipeline 1, the cold gas pipeline 3, and the hot gas pipeline 6 are all communicated with the heat accumulating type heating furnace 5, and the flue gas pipeline 2 is communicated with a chimney.
The combustion-supporting air pipeline 1, the combustion medium pipeline 4, the flue gas pipeline 2 and the cold gas pipeline 3 are all provided with a diffusion pipeline 8. And the combustion-supporting air pipeline 1 and the combustion medium pipeline 4 are both provided with a purging pipeline 7.
Control valves are respectively arranged on the combustion medium pipeline 4, the combustion air pipeline 1, the cold gas pipeline 3, the hot gas pipeline 6 and the flue gas pipeline 2, wherein two sides of the diffusion pipeline 8 are respectively provided with one control valve.
The heat accumulating type heating furnace 5 is internally provided with a temperature measuring device 9, and the temperature measuring device 9 has 5 layers and is distributed at the middle lower part of the heat accumulating type heating furnace 5 at intervals along the vertical direction.
A coal gas heating method adopts the heat accumulating type coal gas heating system in the embodiment to heat cold coal gas, the heating process of a heat accumulating type heating furnace 5 comprises a heat accumulation period and a heat release period, and the heat accumulation period and the heat release period alternately and circularly run; one of 2 heat accumulating type heating furnaces 5 in the heat accumulating type gas heating system is controlled to be in a heat accumulating period and the other is controlled to be in a heat releasing period in the alternate circulation process, so that cold gas is heated uninterruptedly;
wherein the heat storage period is as follows: inputting a combustion medium and combustion-supporting air into a heat accumulating type heating furnace 5 for combustion, heating a heat accumulator by using generated high-temperature flue gas, controlling the temperature in the heat accumulating type heating furnace 5 to be not lower than 400 ℃ according to the temperature measured by a temperature measuring device 9, and removing carbon separated out from coal gas in a heat release period by using the temperature in the heat accumulating type heating furnace 5 in the heat accumulating period; the high-temperature flue gas is finally discharged from a chimney through a flue gas pipeline 2; when the heat accumulation body is heated to the set target temperature, stopping inputting the combustion medium and the combustion-supporting air, and ending the heat accumulation period; introducing inert gas into the heat accumulating type heating furnace 5 through a purging pipeline 7 for purging, and discharging residual gas; in the whole heat accumulation period, the control valves on the two sides of the diffusion pipeline 8 on the cold gas pipeline 3 are in the closing devices, and the diffusion pipeline 8 is kept in an opening state to diffuse the gas leaked from the cold gas pipeline 3 to the air.
Wherein the exothermic period is: inputting cold coal gas into a heat accumulating type heating furnace 5, heating the cold coal gas by heat energy released by a heat accumulator, and outputting the cold coal gas from a hot coal gas pipeline 6 after the cold coal gas is heated to a target temperature; when the temperature of the heated coal gas is lower than the target temperature, the heat release period is ended; after the heat release period is finished, inert gas is introduced into the heat accumulating type heating furnace 5 through the purging pipeline 7 for purging, residual gas is discharged, and then the heat accumulating type heating furnace enters the heat accumulating period for circulating operation. In the whole heat release period, the control valves on two sides of the diffusion pipeline 8 on the combustion medium pipeline 4, the combustion air pipeline 1 and the flue gas pipeline 2 are in closing devices, and the diffusion pipeline 8 is kept in an opening state, so that the gas leaked from the heat accumulating type heating furnace 5 is diffused.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (10)
1. A heat accumulating type gas heating system is characterized in that: the heat accumulating type heating furnace comprises a heat accumulating type heating furnace, a combustion medium pipeline, a combustion-supporting air pipeline, a cold gas pipeline, a hot gas pipeline and a flue gas pipeline, wherein a heat accumulator is arranged in the heat accumulating type heating furnace, at least 2 heat accumulating type heating furnaces are arranged in parallel, and the combustion medium pipeline, the combustion-supporting air pipeline, the cold gas pipeline and the hot gas pipeline are all communicated with the heat accumulating type heating furnace.
2. A regenerative gas heating system as claimed in claim 1, wherein: the combustion-supporting air pipeline, the combustion medium pipeline, the flue gas pipeline and the cold gas pipeline are all provided with a diffusion pipeline; and control valves are arranged on the combustion medium pipeline, the combustion air pipeline, the cold gas pipeline and the flue gas pipeline at the positions on two sides of the diffusion pipeline.
3. A regenerative gas heating system as claimed in claim 1, wherein: the hot gas pipeline is also provided with a control valve.
4. A regenerative gas heating system as claimed in claim 1, wherein: and purging pipelines are arranged on the combustion-supporting air pipeline and the combustion medium pipeline.
5. A regenerative gas heating system as claimed in claim 1, wherein: and the inner linings of the heat accumulator and the heat accumulating type heating furnace are made of non-metal refractory materials.
6. A regenerative gas heating system as claimed in claim 1, wherein: temperature measuring devices are arranged in the heat accumulating type heating furnace and are distributed at intervals in a layered mode in the vertical direction, and the temperature measuring devices are at least 2 layers.
7. A coal gas heating method is characterized in that: the heat accumulating type gas heating system of any one of claims 1 to 6 is adopted to heat cold gas, the heating process of the heat accumulating type heating furnace comprises a heat accumulation period and a heat release period, and the heat accumulation period and the heat release period alternately and circularly operate; and controlling at least 1 heat accumulating type heating furnace in the heat accumulating type gas heating system to be in a heat release period in the alternate circulation process, thereby continuously heating cold gas;
the heat storage period is as follows: inputting a combustion medium and combustion-supporting air into a regenerative heating furnace for combustion, heating a heat accumulator by using generated high-temperature flue gas, stopping inputting the combustion medium and the combustion-supporting air when the heat accumulator is heated to a set target temperature, and ending a heat accumulation period;
the exothermic period is as follows: inputting cold coal gas into a regenerative heating furnace, heating the cold coal gas by heat energy released by a heat accumulator, and outputting the cold coal gas from a hot coal gas pipeline after the cold coal gas is heated to a target temperature; and when the temperature of the heated coal gas is lower than the target temperature, ending the heat release period.
8. The gas heating method according to claim 7, wherein: and when the heat accumulation period and the heat release period are finished, introducing inert gas into the heat accumulation type heating furnace through the purging pipeline for purging, and discharging residual gas.
9. The gas heating method according to claim 7, wherein: in the heat accumulation period, the temperature in the heat accumulation type heating furnace is controlled to be not lower than 400 ℃, and carbon separated out in the CO heating process of the coal gas in the heat release period is burnt and removed by utilizing the temperature in the heat accumulation type heating furnace in the heat accumulation period.
10. The gas heating method according to claim 7, wherein: in the heat storage period, opening a diffusion pipeline on a cold gas pipeline of the heating furnace, and diffusing the gas leaked from the cold gas pipeline to the air; in the heat release period, the diffusing pipelines on the combustion medium pipeline, the combustion-supporting air pipeline and the flue gas pipeline of the heating furnace are opened, and the gas leaked from the heat accumulating type heating furnace is diffused to the air.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110964729.0A CN113720016A (en) | 2021-08-19 | 2021-08-19 | Gas heating method and heat accumulating type gas heating system |
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| CN202110964729.0A CN113720016A (en) | 2021-08-19 | 2021-08-19 | Gas heating method and heat accumulating type gas heating system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114216347A (en) * | 2022-02-08 | 2022-03-22 | 北京科技大学 | Horizontal fast-frequency heat accumulating type high-pressure coal gas heating process |
| CN114480756A (en) * | 2022-03-28 | 2022-05-13 | 新疆八一钢铁股份有限公司 | Coal gas heating method for iron-making blast furnace |
| CN114777334A (en) * | 2022-05-25 | 2022-07-22 | 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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| CN114777334A (en) * | 2022-05-25 | 2022-07-22 | 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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