CN220981332U - Low-calorific-value fuel double-hearth kiln combustion device - Google Patents
Low-calorific-value fuel double-hearth kiln combustion device Download PDFInfo
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- CN220981332U CN220981332U CN202322496426.8U CN202322496426U CN220981332U CN 220981332 U CN220981332 U CN 220981332U CN 202322496426 U CN202322496426 U CN 202322496426U CN 220981332 U CN220981332 U CN 220981332U
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- fuel
- kiln
- thorax
- spray gun
- channel
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- 239000000446 fuel Substances 0.000 title claims abstract description 80
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 29
- 239000007921 spray Substances 0.000 claims abstract description 50
- 238000001816 cooling Methods 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims description 6
- 210000000038 chest Anatomy 0.000 claims 15
- 230000009977 dual effect Effects 0.000 claims 3
- 238000001354 calcination Methods 0.000 description 16
- 238000009825 accumulation Methods 0.000 description 10
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 9
- 239000003546 flue gas Substances 0.000 description 9
- 239000000428 dust Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 3
- 239000002912 waste gas Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
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- Furnace Details (AREA)
Abstract
The utility model discloses a combustion device of a low-calorific-value fuel double-hearth kiln, which comprises a first hearth, a second hearth, a spray gun, a combustion supporting system, a cooling system, a fuel conveying system, a middle-channel spray gun and an annular-channel spray gun which are connected through a middle channel; the fuel pipeline branch is characterized in that a fuel branch pipe extends out of the front of the fuel pipeline branch, three branch pipes are led out of the fuel branch pipe after a second pneumatic valve is arranged on the fuel branch pipe, the middle branch pipe is connected with an electric valve and then is connected with a middle channel spray gun, the other two branch pipes are respectively connected with a third pneumatic valve and then are connected with the middle parts of the first kiln chamber and the second kiln chamber, a fuel ring pipe in the annular channel is arranged in the middle of the first kiln chamber, and the lower part of the fuel ring pipe is connected with an electric valve and then is connected with the annular channel spray gun. The utility model can solve the problems of insufficient combustion, easy product deflection and damage to equipment parts in the existing double-hearth kiln with low heat value.
Description
Technical Field
The utility model relates to the technical field of steel manufacturing and equipment thereof, in particular to a device for low-calorific-value combustion of a double-hearth kiln.
Background
The Maiz shaft kiln is provided with two kiln bores, a first kiln bore 3 and a second kiln bore 4, which are connected through a middle channel 2, the positions of the first kiln bore 3, the second kiln bore 4 and the middle channel 2 form an annular channel, the upper parts of the first kiln bore 3 and the second kiln bore 4 are respectively provided with a spray gun 6 through a large flange, and the spray gun 6 is provided with a spray gun cover plate at the inner position of the kiln; the combustion-supporting fan 1 of the combustion-supporting system is respectively connected with the tops of the kiln chamber I3 and the kiln chamber II 4 through pipelines, is connected with a combustion-supporting air reversing valve, and is connected with a dust remover after being combined; the cooling fan 5 of the cooling system is respectively connected with the bottom discharge hoppers of the kiln chamber I3 and the kiln chamber II 4 through pipelines; the fuel blower 10 of the fuel conveying system is respectively connected with the first kiln chamber 3 and the second kiln chamber 4 after being branched through the fuel pipeline 9, and the branch pipelines respectively connected with the first kiln chamber 3 and the second kiln chamber 4 are respectively provided with a first pneumatic valve 13; as shown in fig. 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.
Lower fuel heating values can lead to a series of problems. Compared with the high-calorific-value fuel, the low-calorific-value fuel has less combustible components and low flame temperature, and is easy to cause the product to deviate. In order to stabilize the productivity and quality, a constant fuel heat input is required, and in the case of a low heating value, the fuel amount input is required to be increased. Because the flue gas after calcination contains a large amount of non-combustible components, such as nitrogen, the flue gas quantity is increased, and the flue gas carries kiln heat into a preheating zone, so that the temperature of the flue gas is relatively higher. The phenomenon is easy to cause burning loss of a large flange of the spray gun and deformation of a cover plate of the spray gun, the service life of a sealing ring of a combustion air reversing valve is influenced, combustion air leakage is generated, and the finished product is generated due to insufficient combustion, high ash content and accelerated furnace condition deterioration. In addition, the exhaust gas temperature is too high and the heat consumption is increased due to the fact that the exhaust gas amount is too large. When the temperature of the waste gas is higher, equipment such as a kiln top sealing ring, a hydraulic cylinder, an instrument and the like are burnt.
Disclosure of Invention
The utility model aims to solve the problems that the existing double-hearth kiln is insufficient in low-heat-value combustion, the product is easy to grow off the shelf, and parts of equipment are damaged.
In order to solve the problems, the technical scheme of the utility model is as follows: the low-calorific-value fuel double-chamber kiln combustion device comprises a first kiln chamber and a second kiln chamber which are connected through a middle channel, wherein annular channels are formed in the positions of the first kiln chamber, the second kiln chamber and the middle channel, spray guns are arranged on the upper parts of the first kiln chamber, the second kiln chamber, combustion-supporting fans are respectively connected with the tops of the first kiln chamber and the second kiln chamber through pipelines, cooling fans are respectively connected with the bottoms of the first kiln chamber and the second kiln chamber through pipelines, fuel fans are respectively connected with the first kiln chamber and the second kiln chamber after being branched through fuel pipelines, pneumatic valves I are respectively arranged on branch pipelines respectively connected with the first kiln chamber and the second kiln chamber, middle channel spray guns are arranged in the middle channel, and annular channel spray guns are uniformly distributed in the annular channels of the first kiln chamber and the second kiln chamber;
The fuel pipeline branch is characterized in that a fuel branch pipe extends out of the front of the fuel pipeline branch, three branch pipes are led out of the fuel branch pipe after a second pneumatic valve is arranged on the fuel branch pipe, the middle branch pipe is connected with an electric valve and then is connected with a middle channel spray gun, the other two branch pipes are respectively connected with a third pneumatic valve and then are connected with the middle parts of the first kiln chamber and the second kiln chamber, a fuel ring pipe in the annular channel is arranged in the middle of the first kiln chamber, and the lower part of the fuel ring pipe is connected with an electric valve and then is connected with the annular channel spray gun.
Among the above technical schemes, more specific schemes may be: the spray gun, the combustion-supporting fan, the cooling fan, the fuel fan and the pneumatic valve are all connected with a control unit.
Further: the middle channel spray gun, the annular channel spray gun, the pneumatic valve II, the pneumatic valve III and the electric valve are all connected with the control unit.
Further: the control unit is a PLC.
Further: the combustion-supporting fan, the cooling fan and the fuel fan are all variable-frequency fans.
Due to the adoption of the technical scheme, compared with the prior art, the utility model has the following beneficial effects:
The low-calorific-value fuel double-hearth kiln combustion device can further prolong the calcining area of materials by adding the middle channel spray gun, the annular channel spray gun and the branches, the fuel ring pipe and the control valve which are added on the fuel pipeline, so that the fuel heat is uniform, the raw material decomposition is more facilitated, and the calcining quality of the finished products is ensured. The intelligent control mode can ensure the calcination of materials, realize the good switching between the fuel chamber and the heat accumulation chamber, and ensure the calcination safety.
Drawings
FIG. 1 is a front view of the prior art;
FIG. 2 is a top view of the lance position and fuel conduit in the upper part of two prior art kiln bores;
FIG. 3 is a front view of an embodiment of the present utility model;
FIG. 4 is a top view of the middle of two kiln bores and fuel lines of an embodiment of the utility model;
FIG. 5 is a schematic view of the configuration of the annular channel lance, fuel collar and electrically operated valve of an embodiment of the utility model;
The marks in the figure are as follows: the combustion-supporting fan 1, the middle channel 2, the first kiln chamber 3, the second kiln chamber 4, the cooling fan 5, the spray gun 6, the electric valve 7, the pneumatic valve III 8, the fuel pipeline 9, the fuel fan 10, the annular channel outer wall 11, the annular channel spray gun 12, the annular channel inner wall 14, the fuel ring pipe 15, the furnace wall 16, the pneumatic valve II 17, the middle channel spray gun 18, the fuel branch pipe 19, the branch pipe 20 and the control unit 21.
Detailed Description
Embodiments of the utility model are described in further detail below with reference to the attached drawing figures:
The low-calorific-value fuel double-hearth kiln combustion device shown in fig. 3 to 5 comprises two kiln hearths, a first kiln hearth 3 and a second kiln hearth 4, which are connected through a middle channel 2, wherein the positions of the first kiln hearth 3, the second kiln hearth 4 and the middle channel 2 form annular channels, the upper parts of the first kiln hearth 3 and the second kiln hearth 4 are respectively provided with a spray gun 6 through a large flange, and the spray gun 6 is provided with a spray gun cover plate at the inner part of the kiln; the combustion-supporting fan 1 of the combustion-supporting system is respectively connected with the tops of the kiln chamber I3 and the kiln chamber II 4 through pipelines, is connected with a combustion-supporting air reversing valve, and is connected with a dust remover after being combined; the cooling fan 5 of the cooling system is respectively connected with the bottom discharge hoppers of the kiln chamber I3 and the kiln chamber II 4 through pipelines; the fuel blower 10 of the fuel conveying system is respectively connected with the first kiln chamber 3 and the second kiln chamber 4 after being branched through the fuel pipeline 9, and the branch pipelines respectively connected with the first kiln chamber 3 and the second kiln chamber 4 are respectively provided with a first pneumatic valve 13.
The middle channel 2 is internally provided with middle channel spray guns 18, annular channel spray guns 12 are uniformly distributed in annular channels of the kiln chamber I and the kiln chamber II, the middle channel spray guns 18 are arranged in the middle of the middle channel, the installation positions of the annular channel spray guns 12 are positioned in the middle of the annular channel outer wall 11 and the annular channel inner wall 14, and the annular channel spray guns are uniformly distributed in the annular direction of the kiln chamber and surround the annular channel for a circle.
The front of the branch of the fuel pipeline 9 is extended to form a fuel branch pipe 19, the fuel branch pipe 19 is provided with a pneumatic valve II 17, three branch pipes 20 are led out, the middle branch pipe 20 is connected with an electric valve 7 and then is connected with a middle channel spray gun 18, the other two branch pipes 20 are respectively connected with a pneumatic valve III 8 and then are connected with a fuel ring pipe 15 in a middle annular channel of a kiln chamber I and a kiln chamber II, the lower part of the fuel ring pipe 15 is connected with an electric valve 7 and then is connected with an annular channel spray gun 12, and the parts of the middle channel spray gun 18 and the annular channel spray gun 18 extending out of the furnace wall 16 are connected with the fuel ring pipe 15, as shown in figure 5. The electrically operated valve 7 may be used to control the flow of fuel into the annular passage, the intermediate passage.
The combustion fan 1, the cooling fan 5 and the fuel fan 10 are all variable frequency fans. The spray gun 6, the combustion-supporting fan 1, the cooling fan 15, the fuel fan 10 and the first pneumatic valve 13 are all connected with a control unit 21, and the middle channel spray gun 18, the annular channel spray gun 12, the second pneumatic valve 17, the third pneumatic valve 8 and the electric valve 7 are all connected with the control unit 21, and the control unit is a PLC.
The control step comprises the following steps:
When the kiln chamber 3 is calcined, the first pneumatic valve 13 of the kiln chamber 3 is opened, the first pneumatic valve 13 of the kiln chamber 4 is closed, and fuel is conveyed into the kiln chamber 3 through the spray gun 1 of the kiln chamber 3; the pneumatic valve II 17 is opened, the pneumatic valve III 8 and the electric valve 7 of the kiln chamber 3 are opened, and the electric valve opening to the middle channel is opened. And the pneumatic valve III 8 and the electric valve of the kiln chamber 4 are closed. Fuel is also fed into the annular channel and the intermediate channel 2 through the intermediate channel lance 18 and the annular channel lance 12, respectively, to increase the calcination temperature in this region.
After the direction change, when the kiln chamber No. 4 is calcined, the pneumatic valve No. 13 of the kiln chamber No. 4 is opened, the pneumatic valve No. 13 of the kiln chamber No. 3 is closed, and fuel is conveyed into the kiln chamber No. 4 through the spray gun 6 of the kiln chamber No. 4; the pneumatic valve II 17 is opened, the pneumatic valve III 8 and the electric valve 7 of the kiln chamber 4 are opened. The pneumatic valve III 8 and the electric valve 7 of the kiln chamber I3 are closed, the electric valve 7 which opens to the middle channel is opened, and fuel is also fed into the annular channel and the middle channel 2 respectively through the middle channel spray gun 18 and the annular channel spray gun 12, so that the calcining temperature in the area is increased.
And in the reversing period, the first kiln chamber 3 and the second kiln chamber 4 are closed by the pneumatic valve I13, the pneumatic valve II 17 and the electric valve 7, and the fuel is prevented from entering the kiln.
The device can further prolong the calcining area of the material, so that the fuel heat is uniform, the raw material decomposition is more facilitated, and the calcining quality of the finished product is ensured. The intelligent control mode can ensure the calcination of materials, realize the good switching between the fuel chamber and the heat accumulation chamber, and ensure the calcination safety.
Claims (5)
1. The utility model provides a two thorax kiln burner of low calorific value fuel, includes a thorax and No. two thorax that connect through the intermediate channel, no. one the thorax with No. two thorax with the position of intermediate channel all forms annular channel, no. one the thorax with No. two thorax upper portions all are provided with the spray gun, combustion-supporting fan passes through the pipeline and connects respectively No. one the thorax with No. two thorax's top, cooling blower passes through the pipeline and connects respectively No. one the thorax with No. two thorax's bottom, fuel fan passes through the fuel pipeline branch back and connects respectively No. one the thorax with No. two thorax, connect respectively one the thorax with respectively be provided with a pneumatic valve one on No. two thorax's the lateral duct, its characterized in that: the middle channel is internally provided with middle channel spray guns, and annular channel spray guns are uniformly distributed in the annular channels of the first kiln chamber and the second kiln chamber;
The fuel pipeline branch is characterized in that a fuel branch pipe extends out of the front of the fuel pipeline branch, three branch pipes are led out of the fuel branch pipe after a second pneumatic valve is arranged on the fuel branch pipe, the middle branch pipe is connected with an electric valve and then is connected with a middle channel spray gun, the other two branch pipes are respectively connected with a third pneumatic valve and then are connected with the middle parts of the first kiln chamber and the second kiln chamber, a fuel ring pipe in the annular channel is arranged in the middle of the first kiln chamber, and the lower part of the fuel ring pipe is connected with an electric valve and then is connected with the annular channel spray gun.
2. The low heating value fuel dual kiln combustion device as defined in claim 1, wherein: the spray gun, the combustion-supporting fan, the cooling fan, the fuel fan and the pneumatic valve are all connected with a control unit.
3. The low heating value fuel dual kiln combustion device as claimed in claim 2, wherein: the middle channel spray gun, the annular channel spray gun, the pneumatic valve II, the pneumatic valve III and the electric valve are all connected with the control unit.
4. A low heating value fuel dual kiln combustion device according to claim 3, characterized in that: the control unit is a PLC.
5. The low heating value fuel double-hearth kiln combustion apparatus according to any one of claims 1 to 4, wherein: the combustion-supporting fan, the cooling fan and the fuel fan are all variable-frequency fans.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322496426.8U CN220981332U (en) | 2023-09-14 | 2023-09-14 | Low-calorific-value fuel double-hearth kiln combustion device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322496426.8U CN220981332U (en) | 2023-09-14 | 2023-09-14 | Low-calorific-value fuel double-hearth kiln combustion device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220981332U true CN220981332U (en) | 2024-05-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322496426.8U Active CN220981332U (en) | 2023-09-14 | 2023-09-14 | Low-calorific-value fuel double-hearth kiln combustion device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220981332U (en) |
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2023
- 2023-09-14 CN CN202322496426.8U patent/CN220981332U/en active Active
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