CN220602219U - Device for stably recovering carbon dioxide in double-chamber kiln - Google Patents
Device for stably recovering carbon dioxide in double-chamber kiln Download PDFInfo
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- CN220602219U CN220602219U CN202322012567.8U CN202322012567U CN220602219U CN 220602219 U CN220602219 U CN 220602219U CN 202322012567 U CN202322012567 U CN 202322012567U CN 220602219 U CN220602219 U CN 220602219U
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- Prior art keywords
- carbon dioxide
- kiln
- flue gas
- pipeline
- recovery
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 202
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 101
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 101
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000003546 flue gas Substances 0.000 claims abstract description 55
- 238000011084 recovery Methods 0.000 claims abstract description 45
- 239000000428 dust Substances 0.000 claims abstract description 24
- 238000001816 cooling Methods 0.000 claims abstract description 16
- 210000000038 chest Anatomy 0.000 claims description 2
- 230000009977 dual effect Effects 0.000 claims 1
- 238000002485 combustion reaction Methods 0.000 description 14
- 238000009825 accumulation Methods 0.000 description 8
- 238000004064 recycling Methods 0.000 description 8
- 239000000779 smoke Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000001354 calcination Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 3
- 235000011941 Tilia x europaea Nutrition 0.000 description 3
- 238000005338 heat storage Methods 0.000 description 3
- 239000004571 lime Substances 0.000 description 3
- 235000019738 Limestone Nutrition 0.000 description 2
- 238000003763 carbonization Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003034 coal gas Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
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- Carbon And Carbon Compounds (AREA)
Abstract
The utility model discloses a device for stably recovering carbon dioxide from a double-hearth kiln, which comprises a first kiln and a second kiln, wherein the tops of the first kiln and the second kiln are respectively connected with a flue gas dust remover through pipelines, a flue gas dust removal fan is connected to a flue gas air outlet pipeline connected with the flue gas dust remover, a cooling air pipe and a cooling air electric valve are sequentially arranged on the flue gas air outlet pipeline after the flue gas dust removal fan is connected, an electric valve I, a carbon dioxide detector I, a pressure gauge and an electric valve II are sequentially arranged on the flue gas air outlet pipeline of the first kiln, a carbon dioxide recovery pipeline I is arranged between the carbon dioxide detector I and the pressure gauge on the flue gas air outlet pipeline of the second kiln, a carbon dioxide recovery pipeline II is led out from the carbon dioxide recovery pipeline I, and the carbon dioxide detector II and the carbon dioxide recovery fan are sequentially arranged on the carbon dioxide recovery pipeline II. The utility model can solve the problems that the concentration of carbon dioxide in the reversing period of the existing double-chamber kiln is reduced and the carbon dioxide cannot be stably recovered.
Description
Technical Field
The utility model relates to the technical field of steel manufacturing and equipment thereof, in particular to a device for stably recycling carbon dioxide in a double-hearth kiln.
Background
The vertical kiln has two kiln bores, kiln 14 and kiln 15, and connect through the intermediate channel, kiln 14 and kiln 15's top respectively is connected with flue gas dust remover 13 through the pipeline, is connected with flue gas dust removal fan 1 on flue gas air-out pipeline 2 that flue gas dust remover 13 connects, and cooling tuber pipe 4 connects kiln 14 and kiln 15's bottom's discharge hopper through cooling wind motorised valve 5 respectively, as shown in figure 1. The greatest advantage in the calcination process is parallel flow and heat accumulation, wherein 'parallel flow' means that when the combustion cylinder gas is calcined, the gas, the combustion air and the limestone are parallel downward, and the combustion flue gas is downward, which is beneficial to the calcination of high-quality active lime. The heat accumulation refers to that fuel combustion products, namely high-temperature smoke, enter the heat accumulation chamber through a connecting channel between two kiln chambers in the combustion cylinder. In the heat accumulation chamber, high-temperature flue gas flows from bottom to top, and heat is transferred to the limestone raw material in the preheating zone to preheat the stone to a higher temperature. And meanwhile, the temperature of the high-temperature waste gas is reduced to be lower after heat exchange, and the high-temperature waste gas is discharged into the atmosphere through a flue gas bag-type dust remover.
In the combustion operation process, the two kilns of the Maiz kiln perform function conversion once every 12-14 minutes, namely, when one kiln chamber is in a calcination state, the other kiln chamber is in a heat storage state. Under normal state, the system delivers a large amount of coal gas and combustion-supporting air to the combustion chamber, so that the normal combustion of the combustion chamber is ensured, and the flue gas dust remover ensures that the top of the heat accumulation chamber is in a negative pressure environment, so that the pressure of the combustion chamber is always higher than that of the heat accumulation chamber, and high-temperature flue gas smoothly flows to the heat accumulation chamber to realize heat accumulation.
After the end of a calcination cycle in the melz kiln, the system enters the commutation period. The entire commutation period takes about 45 seconds. In the reversing period, the combustion air release valve and the cooling air release valve of the Maerz kiln are sequentially opened, the pressure in the kiln is released to be zero, the change of the position of the kiln release valve is realized, and the calcination of the next period is started again.
In the combustion chamber, fuel (pulverized coal or coal gas) is calcined to generate smoke, and the smoke enters the heat storage chamber through the middle channel and is discharged into the atmosphere through the heat storage chamber and the dust removal system together with cooling air at the bottom of the kiln. In the reversing period, the fuel system is cut off, so that the combustion chemical reaction is not generated any more, and various components of the flue gas are in a fluctuation state, such as the reduction of the concentration of carbon dioxide. In order to ensure the stable concentration of the carbon dioxide in the flue gas recovered by the double-hearth kiln, a device for recovering the flue gas of the double-hearth kiln is designed.
Disclosure of Invention
The utility model aims to solve the problem of providing a device for stably recovering carbon dioxide in a double-hearth kiln, which aims to solve the problem that the concentration of carbon dioxide in the reversing period of the existing double-hearth kiln is reduced and the carbon dioxide cannot be stably recovered.
In order to solve the problems, the technical scheme of the utility model is as follows: this two thorax kilns are stable to retrieve carbon dioxide device includes kiln and No. two kilns of being connected through the intermediate channel, kiln with the top of No. two kilns is connected with the flue gas dust remover respectively through the pipeline, be connected with the flue gas dust removal fan on the flue gas air-out pipeline that the flue gas dust remover is connected, the cooling tuber pipe is connected through the cooling air motorised valve respectively kiln with No. two kiln bottoms, the flue gas air-out pipeline is being connected behind the flue gas dust removal fan be equipped with motorised valve one, carbon dioxide detector one, manometer and motorised valve two in proper order, be equipped with carbon dioxide recovery pipeline one between carbon dioxide detector one on the flue gas air-out pipeline of kiln and the manometer with be equipped with carbon dioxide recovery pipeline one on the flue gas air-out pipeline of No. two kilns between carbon dioxide detector one and the manometer, carbon dioxide recovery pipeline two are gone up to draw forth carbon dioxide recovery pipeline two, install carbon dioxide detector two and carbon dioxide recovery fan on the carbon dioxide recovery pipeline two in proper order.
Among the above technical schemes, more specific schemes may be: the first electric valve, the first carbon dioxide detector, the pressure gauge and the second electric valve are connected with a control unit.
Further: and the second carbon dioxide detector and the carbon dioxide recovery fan are connected with the control unit.
Further: the control unit is a PLC.
Further: the carbon dioxide recovery fan is a variable frequency fan.
Due to the adoption of the technical scheme, compared with the prior art, the utility model has the following beneficial effects:
the device for stably recycling the carbon dioxide in the double-hearth kiln can effectively control the recycling concentration of the carbon dioxide by controlling the electric valve in a linkage manner through the installation control of the electric instrument, so that the carbon dioxide recycling concentration is stabilized in a certain range; aiming at the unstable characteristics of carbon dioxide in flue gas caused by reversing of a plurality of double-hearth kilns and other time periods, the stable recovery of carbon dioxide is realized through a control step; the device can be applied to more than two kilns for simultaneously recovering the smoke, and stably controlling the concentration of carbon dioxide recovered by the smoke to ensure the stable concentration; stable carbon dioxide recovery would be beneficial to carbon dioxide gas production and further lime deep processing carbonization processes.
Drawings
FIG. 1 is a front view of the prior art;
FIG. 2 is a front view of an embodiment of the present utility model;
the marks in the figure are as follows: the flue gas dust removal fan 1, flue gas air-out pipeline 2, motorised valve one 3, cooling tuber pipe 4, cooling wind motorised valve 5, carbon dioxide detector one 6, manometer 7, motorised valve two 8, carbon dioxide recovery pipeline one 9, carbon dioxide detector two 10, carbon dioxide recovery pipeline two 11, carbon dioxide recovery fan 12, flue gas dust remover 13, kiln No. 14, kiln No. two 15, control unit 16.
Detailed Description
Embodiments of the utility model are described in further detail below with reference to the attached drawing figures:
the device for stably recycling carbon dioxide in the double-chamber kiln shown in fig. 2 comprises a first kiln 14 and a second kiln 15, wherein the device is connected through a middle channel, the tops of the first kiln 14 and the second kiln 15 are respectively connected with a flue gas dust remover 13 through pipelines, a flue gas dust removal fan 1 is connected to a flue gas air outlet pipeline 2 connected with the flue gas dust remover 13, and a cooling air pipe 4 is respectively connected with discharge hoppers at the bottoms of the first kiln 14 and the second kiln 15 through a cooling air electric valve 5.
The flue gas air-out pipeline 2 is provided with an electric valve I3, a carbon dioxide detector I6, a pressure gauge 7 and an electric valve II 8 in sequence after being connected with the flue gas dust removal fan 1, a carbon dioxide recovery pipeline I9 is arranged between the carbon dioxide detector I6 on the flue gas air-out pipeline of the kiln I14 and the pressure gauge 7 and between the carbon dioxide detector I6 on the flue gas air-out pipeline of the kiln II 15 and the pressure gauge 7, a carbon dioxide recovery pipeline II 11 is led out on the carbon dioxide recovery pipeline I9, and a carbon dioxide detector II 10 and a carbon dioxide recovery fan 12 are sequentially arranged on the carbon dioxide recovery pipeline II 11. The first electric valve 3, the first carbon dioxide detector 6, the pressure gauge 7, the second electric valve 8, the second carbon dioxide detector 10 and the carbon dioxide recovery fan 12 are connected with the control unit 16, and the control unit is a PLC; the carbon dioxide recovery fan 12 is a variable frequency fan.
The control step of the control unit 16 includes:
when kiln 14 or kiln 15 is in production stopping, the electric valve 3 and the electric valve 8 on the flue gas air outlet pipeline of kiln 14 or kiln 15 are closed because no flue gas is generated.
When the first kiln 14 and the second kiln 15 are both produced, kiln combustion time and reversing time are set to be consistent in parameter values so as to ensure that the flue gas carbon dioxide recovery concentration of the first kiln and the second kiln is uniform, and the reversing periods of the two kilns are ensured to be different in reversing; before the reversing period, the cooling air electric valves 5 on the cold air pipelines of the first kiln and the second kiln are closed, and the electric valve I3 is set to be 60 percent.
And starting a carbon dioxide recovery fan 12 on the second carbon dioxide recovery pipeline 11 to recover the flue gas of the two kilns.
The kiln number one 14 cuts off fuel 20 seconds before reversing, and the carbon dioxide concentration of the flue gas is reduced; when the detection data of the first kiln 14 carbon dioxide detector I6 is low, the opening of the first kiln electric valve I3 is reduced, and the opening of the second kiln 15 electric valve I3 is increased, so that the concentration of carbon dioxide conveyed to a carbon dioxide recovery pipeline is ensured to be stable; when the detection data of the first kiln 14 carbon dioxide detector 6 is higher, the opening degree of the first kiln 14 electric valve 3 is increased, and the opening degree of the second kiln 15 electric valve 3 is reduced, so that the concentration of carbon dioxide conveyed to the carbon dioxide recovery pipeline is ensured to be stable (can be judged by the second carbon dioxide detector 10).
In the production process of the first kiln 14 and the second kiln 15, the flue gas outlet pipeline 2 is in a positive pressure state, namely the detection data of the pressure gauge 7 is more than 0kpa, and the second electric valve 8 is opened to ensure that the outside air does not enter; when the detection data of the pressure gauge 7 is less than 0kpa, the second electric valve 8 is closed, and the rotation speed of the carbon dioxide recovery fan 12 is reduced, so that the smoke generated by the first kiln 14 and the second kiln 15 can be fully utilized, the safety of the whole system is ensured, and the concentration of the recovered carbon dioxide is stable; when the detection data of the pressure gauge 7 is < -10kpa, and the frequency is reduced to below 20HZ by the carbon dioxide recovery fan 12, and the production requirement cannot be met, the cooling air electric valve 5 is opened, so that the pipeline is prevented from being damaged by the atmospheric pressure flat due to low pressure.
The device for stably recycling the carbon dioxide in the double-hearth kiln can effectively control the recycling concentration of the carbon dioxide by controlling the electric valve in a linkage manner through the installation control of the electric instrument, so that the carbon dioxide recycling concentration is stabilized in a certain range; aiming at the unstable characteristics of carbon dioxide in flue gas caused by reversing of a plurality of double-hearth kilns and other time periods, the stable recovery of carbon dioxide is realized through a control step; the device can be applied to more than two kilns for simultaneously recovering the smoke, and stably controlling the concentration of carbon dioxide recovered by the smoke to ensure the stable concentration; stable carbon dioxide recovery would be beneficial to carbon dioxide gas production and further lime deep processing carbonization processes.
Claims (5)
1. The utility model provides a carbon dioxide device is retrieved steadily to two thorax kilns, includes a kiln and No. two kilns of being connected through the intermediate channel, a kiln with No. two kilns's top is respectively connected with the flue gas dust remover through the pipeline, be connected with flue gas dust removal fan on the flue gas air-out pipeline that the flue gas dust remover is connected, the cooling tuber pipe is connected through the cooling wind motorised valve respectively a kiln with No. two kiln bottoms, its characterized in that: the flue gas air-out pipeline is connected behind the flue gas dust removal fan is equipped with motorised valve one, carbon dioxide detector one, manometer and motorised valve two in proper order, between carbon dioxide detector one and the manometer on the flue gas air-out pipeline of kiln one with be equipped with carbon dioxide recovery pipeline one between carbon dioxide detector one and the manometer on the flue gas air-out pipeline of kiln two, draw forth carbon dioxide recovery pipeline two on the carbon dioxide recovery pipeline one, install carbon dioxide detector two and carbon dioxide recovery fan on the carbon dioxide recovery pipeline two in proper order.
2. The apparatus for stable recovery of carbon dioxide in a double-hearth kiln as defined in claim 1, wherein: the first electric valve, the first carbon dioxide detector, the pressure gauge and the second electric valve are connected with a control unit.
3. The apparatus for stable recovery of carbon dioxide in a double-hearth kiln according to claim 2, wherein: and the second carbon dioxide detector and the carbon dioxide recovery fan are connected with the control unit.
4. A dual chamber kiln stable carbon dioxide recovery apparatus according to claim 3, wherein: the control unit is a PLC.
5. The apparatus for stable recovery of carbon dioxide in a double-hearth kiln according to any one of claims 1 to 4, wherein: the carbon dioxide recovery fan is a variable frequency fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322012567.8U CN220602219U (en) | 2023-07-28 | 2023-07-28 | Device for stably recovering carbon dioxide in double-chamber kiln |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322012567.8U CN220602219U (en) | 2023-07-28 | 2023-07-28 | Device for stably recovering carbon dioxide in double-chamber kiln |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220602219U true CN220602219U (en) | 2024-03-15 |
Family
ID=90172566
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322012567.8U Active CN220602219U (en) | 2023-07-28 | 2023-07-28 | Device for stably recovering carbon dioxide in double-chamber kiln |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220602219U (en) |
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2023
- 2023-07-28 CN CN202322012567.8U patent/CN220602219U/en active Active
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