CN217921861U - Negative pressure air supply device for double-chamber kiln - Google Patents
Negative pressure air supply device for double-chamber kiln Download PDFInfo
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- CN217921861U CN217921861U CN202222305015.1U CN202222305015U CN217921861U CN 217921861 U CN217921861 U CN 217921861U CN 202222305015 U CN202222305015 U CN 202222305015U CN 217921861 U CN217921861 U CN 217921861U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/40—Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills
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Abstract
The utility model discloses a double-hearth kiln negative pressure air supply device, which relates to the technical field of kilns and comprises a dust removal fan connected with a flue gas dust remover, wherein a thermocouple is installed at the inlet of the flue gas dust remover, the double-hearth kiln negative pressure air supply device also comprises a cooling belt air pipe communicated with a first kiln hearth and a second kiln hearth, the two ends of the cooling belt air pipe are respectively connected with the middle sections of the cooling belts of the first kiln hearth and the second kiln hearth, a heat exchange air pipe is connected between the cooling belt air pipe and a kiln top flue gas pipeline, and a first valve and a second valve are respectively installed between the heat exchange air pipe and the first kiln hearth and between the second kiln hearth on the cooling belt air pipe; a heat exchanger is arranged on the heat exchange air pipe, a combustion-supporting air branch pipe penetrating through the heat exchanger is arranged on the combustion-supporting air pipe, and the combustion-supporting air branch pipe is connected with the middle channel; and a cold air mixing valve is arranged on the kiln top flue gas pipeline, and a thermocouple is arranged between the cold air mixing valve and the flue gas dust remover. This device can reduce the carbon recovery cost of flue gas, improves the flue gas temperature in a flexible way, avoids the flue gas temperature to hang down to lead to the dust removal sack to harden.
Description
Technical Field
The utility model belongs to the technical field of the kiln technique and specifically relates to a two thorax kiln negative pressure air supply unit.
Background
The double-hearth kiln has two hearths, one hearth stores heat while the other hearth carries out calcination. The two hearths are reversed every 14 minutes, a hydraulic valve acts during the reversing to release gas in the kiln, and the position of a flashboard is changed at the same time, so that the conversion between the calcining hearths and the heat storage hearths is realized. In the calcining chamber, fuel is pressurized by a pressurizing machine, is fed into the calcining chamber from a fuel spray gun 6, and is mixed with combustion-supporting air 7 introduced from a combustion-supporting air pipe 1 from the upper part of the kiln for combustion. The flue gas generated by calcination flows to the heat storage chamber through the annular channel and the middle channel 4, flows upwards under the action of cooling air 5 from bottom to top (as shown in figure 1), stores heat of stones which are just added into the heat storage chamber, and enters the flue gas dust remover 11 after the temperature is reduced. Every cycle system feeds in raw material three times to the heat accumulation thorax, and when kiln thorax apron was opened at every turn, for avoiding the raise dust, the system can promote dust exhausting fan rotational speed. In order to ensure the stable material level, the finished product produced by calcination is accurately measured by a material level meter, the hydraulic cylinder pushes the ash discharging device, and the lime blocks on the upper part of the ash discharging device in the kiln fall into a small storage bin at the bottom of the kiln from the edge. During the reversing period, the discharging flashboard is opened, and the finished product can enter a finished product production line.
The shaft kiln is divided into a preheating zone (20-400 ℃), a calcining zone (400-1000 ℃) and a cooling zone (1000-100 ℃) from top to bottom. The preheating zone is a kilnThe distance from the inner stone material surface 8 to the muzzle of the spray gun 6 realizes preheating of stone materials from normal temperature; the calcining zone, i.e. the lance 6, reaches the intermediate channel 4, thus realizing the calcining of the stone material. In the calcination zone, reaction predominantly takes place as CaCO 3 →CaO+CO 2 ×) which is an endothermic decomposition reaction, i.e. CaCO 3 In the case of heating, decomposition into CaO and CO 2 . In the cooling zone, the temperature of the channel can reach about 1000 ℃, the material vertically moves downwards from top to bottom along with the action of the discharging mechanism at the bottom of the kiln, and the temperature of the material is gradually reduced under the cooling action of cooling air. Cooling the finished lime by cooling air, wherein CaO and CO are simultaneously accompanied 2 Combined formation of CaCO 3 Leading to the reaction to produce calcium carbonate again, and influencing the decomposition of the calcium carbonate raw material.
The flue gas temperature of the double-chamber kiln is relatively low and is about 100 ℃. In order to realize the desulfurization and denitrification of the flue gas, the common method is to heat the flue gas by using an electric or coal gas combustion mode to ensure that the temperature of the flue gas is not lower than 170 ℃, and the method has a combined reaction condition with adsorbed materials in a denitrification device.
To obtain high-quality CaO, the amount of CaCO in the finished product is reduced 3 Content, and simultaneously, in order to realize flexible improvement of the temperature of the flue gas, the negative pressure air supply device can be invented, and can fully recycle the heat of the air flow of the cooling zone and simultaneously decompose CO generated in the kiln 2 The gas is absorbed into the flue gas pipeline of the flue gas dust remover to realize the CO in the flue gas 2 The promotion of (2) is favorable for reducing the carbon recovery cost of the flue gas. Meanwhile, the flue gas temperature can be increased, the phenomenon that the dust removal cloth bag is hardened due to low flue gas temperature of the cloth bag in autumn and winter is avoided, and conditions can be created for the next desulfurization and denitrification.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a two thorax kiln negative pressure air supply device, this kind of device can reduce the carbon recovery cost of flue gas, improves flue gas temperature in a flexible way, avoids the flue gas temperature to result in the dust removal sack to harden on the low side.
In order to achieve the above purpose, the utility model discloses a technical scheme is: the negative pressure air supply device for the double-hearth kiln comprises a dust removal fan connected behind an outlet of a flue gas dust remover, wherein a thermocouple is installed at an inlet of the flue gas dust remover, the negative pressure air supply device also comprises a cooling belt air pipe communicated with a first kiln hearth and a second kiln hearth, two ends of the cooling belt air pipe are respectively connected to the middle section of the cooling belt of the first kiln hearth and the middle section of the cooling belt of the second kiln hearth, a heat exchange air pipe is connected between the cooling belt air pipe and a kiln top flue gas pipeline, and a first valve and a second valve are respectively installed on the cooling belt air pipe between the heat exchange air pipe and the first kiln hearth and between the cooling belt air pipe and the second kiln hearth; a heat exchanger is installed on the heat exchange air pipe, a combustion-supporting air branch pipe penetrating through the heat exchanger is arranged on the combustion-supporting air pipe, and the combustion-supporting air branch pipe is connected with the middle channel; and the kiln top flue gas pipeline is provided with a doped cold air valve, and the thermocouple is arranged between the doped cold air valve and the flue gas dust remover.
In the technical scheme of the double-hearth kiln negative pressure air supply device, the more specific technical scheme can be as follows: and an inlet valve and an outlet valve are respectively arranged on the heat exchange air pipe at the inlet and the outlet of the heat exchanger.
Furthermore, an air inlet valve and an air outlet valve are respectively arranged on the combustion-supporting air branch pipe between the heat exchanger and the combustion-supporting air pipe and between the heat exchanger and the intermediate channel.
Further, the first valve and the second valve are both pneumatic valves.
Furthermore, a plurality of layers of refractory material layers are arranged in the heat exchange air pipe.
Furthermore, the doped cold air valve is arranged between the heat exchange air pipe and the thermocouple.
Furthermore, the nominal diameter of the cooling air carrying pipe and the heat exchange air pipe is 1-2 m.
Furthermore, the cooling air duct is horizontally arranged, and the heat exchange air duct is vertically arranged above the cooling air duct.
Further, the heat exchanger is arranged on the platform of the middle channel.
Furthermore, the cooling belt air pipe is welded and sealed on the furnace shell steel structure.
Since the technical scheme is used, compared with the prior art, the utility model following beneficial effect has:
1. the cooling zone air pipes connected to the middle sections of the cooling zones of the two kiln chambers are arranged, the cooling zone air pipes and the kiln top flue gas pipeline are connected with the heat exchange air pipes, and CO generated by decomposition in the kiln can be decomposed under the action of negative pressure air suction of the dust removal fan 2 The gas is sucked into the flue gas pipeline of the flue gas dust remover from the cooling zone through the air pipe to realize the CO in the flue gas 2 The concentration of the flue gas is improved, and the improvement of the CO in the flue gas is facilitated 2 The gas recovery efficiency is improved, the carbon recovery cost of the flue gas is reduced, and the product quality is improved; the heat exchanger is arranged on the heat exchange air pipe, the combustion-supporting air branch pipe penetrates through the heat exchanger to be connected to the middle channel, the preheating of the combustion-supporting air and the flue gas entering the dust remover can be realized by utilizing the heat of the high-temperature flue gas at the middle section of the kiln chamber cooling zone at 800-1000 ℃, the oxygen content of the preheated combustion-supporting air is higher than that of the combustion flue gas, the full combustion of the fuel which is not completely combusted is facilitated, the cloth bag hardening of the high-temperature flue gas entering the dust remover is avoided, and the service life of the cloth bag is prolonged; the flue gas of the double-hearth kiln can reach the temperature not lower than 170 ℃, and the combined reaction condition with adsorbed materials in denitration equipment is provided, so that the clean production of the double-hearth kiln is facilitated, and the denitration application of the flue gas of the double-hearth kiln is promoted.
2. The heat exchanger inlet and outlet valves and the inlet and outlet valves of the combustion-supporting air branch pipes are arranged, so that the heat exchanger can be conveniently overhauled when in failure; and a valve with an air pipe is cooled by adopting a pneumatic valve, so that the quantity of flue gas entering the heat exchanger can be flexibly controlled.
3. The refractory material layers are arranged in the cooling air pipe and the heat exchange air pipe, so that the service life of the air pipe can be prolonged.
4. The arrangement of the connection position of the mixing cold air valve can accurately adjust the temperature of the flue gas entering the dust remover.
5. The nominal diameter range of the air pipe can ensure that the flue gas in the kiln can smoothly enter the air pipe, and the normal operation in the kiln can not be influenced.
6. The air pipe and the heat exchanger are arranged towards and at positions, so that the rapid machining and the installation are convenient.
Drawings
FIG. 1 is a schematic view of combustion air and flue gas paths of a conventional dual-chamber kiln.
Fig. 2 is a schematic view of the connection structure of the negative pressure air supply device of the double-chamber kiln and the paths of combustion-supporting air and flue gas.
The reference numbers indicate: 1. a combustion-supporting air pipe; 2. a first kiln chamber; 3. a second kiln chamber; 4. a middle channel; 5. cooling air; 6. a spray gun; 7. combustion-supporting air; 8. stone material surface; 9. a kiln top flue gas pipeline; 10. a thermocouple; 11. a flue gas dust remover; 12. a dust removal fan; 13. cooling the air carrying pipe; 13-1, a first valve; 13-2, a second valve; 14. a heat exchange air pipe; 14-1, an inlet valve; 14-2, an outlet valve; 15. a heat exchanger; 16. a mixing cold air valve; 17. a combustion-supporting air branch pipe; 17-1, an air inlet valve; 17-2 air outlet valves; 17-3, heating combustion-supporting air.
Detailed Description
The invention will be described in more detail with reference to the following embodiments:
the double-hearth kiln negative pressure air supply device shown in fig. 2 comprises a dust removal fan 12 connected behind the outlet of a flue gas dust remover 11, and further comprises a cooling belt air pipe 13 capable of communicating a first kiln hearth 2 and a second kiln hearth 3, one end of the cooling belt air pipe 13 is connected to the cooling belt middle section of the first kiln hearth 2, the other end of the cooling belt air pipe 13 is connected to the cooling belt middle section of the second kiln hearth 3, and the cooling belt air pipe 13 is horizontally arranged and is arranged up and down in parallel with the middle channel 4 of the double-hearth kiln. Be connected with heat transfer tuber pipe 14 between cooling zone tuber pipe 13 and the kiln top flue gas pipeline 9, cooling zone tuber pipe 13 passes through heat transfer tuber pipe 14 and kiln top flue gas pipeline 9 intercommunication, heat transfer tuber pipe 14 is vertical to be set up on cooling zone tuber pipe 13, heat transfer tuber pipe 14 and cooling zone tuber pipe 13 adopt the same steel pipe of diameter to make, the nominal diameter of steel pipe is 1m ~ 2m, it is equipped with refractory material to spread on the steel pipe inner wall, refractory material includes the thermal-insulated fiberboard layer that inwards sets gradually by the steel pipe inner wall, the insulating brick layer, the high alumina brick layer. During installation, when the cooling zone air pipe 13 is welded with the furnace shell steel structure, the sealing level is required to be realized, the support is arranged on the steel structure, and the refractory material masonry is strictly constructed, so that the service life of the refractory material is prevented from being influenced. A first valve 13-1 and a second valve 13-2 are respectively arranged on the cooling air duct 13 between the heat exchange air duct 14 and the first kiln chamber 2 and the second kiln chamber 3, and the first valve 13-1 and the second valve 13-2 are pneumatic valves. When passing through the platform of the intermediate channel 4, the heat exchange air duct 14 is provided with a heat exchanger 15, the heat exchange air duct 14 passes through the heat exchanger 15, and an inlet valve 14-1 and an outlet valve 14-2 are respectively arranged on the inlet and the outlet of the heat exchanger 15 on the heat exchange air duct 14. A kiln top flue gas pipeline 9 connected with a flue gas dust collector 11 is provided with a cold air mixing valve 16 and a thermocouple 10 for protecting a dust collector cloth bag in the flue gas dust collector 11, the thermocouple 10 is arranged at an inlet of the flue gas dust collector 11, and the cold air mixing valve 16 is arranged between a heat exchange air pipe 14 and the thermocouple 10. A combustion-supporting air branch pipe 17 penetrating through the heat exchanger 15 is arranged on the combustion-supporting air pipe 1, the combustion-supporting air branch pipe 17 is connected with the middle channel 4, and an air inlet valve 17-1 and an air outlet valve 17-2 are respectively arranged on the combustion-supporting air branch pipe 17 between the heat exchanger 15 and the combustion-supporting air pipe 1 and between the combustion-supporting air pipe 17 and the middle channel 4.
When in use, the inlet valve 14-1 and the outlet valve 14-2 at the upper end and the lower end of the heat exchanger 15 and the air inlet valve 17-1 and the air outlet valve 17-2 on the combustion air branch pipe 17 are in an open state. In order to realize good preheating effect of the flue gas, when the first kiln chamber 2 is calcined, a first valve 13-1 on a cooling belt air pipe 13 connected with the middle section of a cooling belt of the first kiln chamber 2 is opened, and a second valve 13-2 on the cooling belt air pipe 13 connected with the middle section of the cooling belt of the second kiln chamber 3 is closed, so that under the action of negative pressure air suction of a dust removal fan 12, when the first kiln chamber 2 is calcined, part of high-temperature flue gas burnt in the first kiln chamber 2 can fully enter the heat exchanger 15 through the cooling belt air pipe 13, the first valve 13-1, a heat exchange air pipe 14 and an inlet valve 14-1; meanwhile, fresh combustion-supporting air 7 enters the heat exchanger 15 from the combustion-supporting air pipe 1 through the combustion-supporting air branch pipe 17 and the air inlet valve 17-1 to exchange heat with high-temperature flue gas, the temperature of the combustion-supporting air 7 passing through the heat exchanger 15 is raised to obtain preheated warming combustion-supporting air 17-3, the preheated warming combustion-supporting air is fed into the middle channel 4 along the combustion-supporting air branch pipe 17 through the air outlet valve 17-2, and then the warming combustion-supporting air enters the kiln through the middle channel 4 to be used for continuous combustion of unburned fuel in the kiln; the opening and closing of the air inlet valve 17-1 and the air outlet valve 17-2 are adjusted, so that the air quantity entering the middle channel 4 can be effectively adjusted. The temperature of the high-temperature flue gas of the heat exchange air pipe 14 can be reduced to a certain extent after heat exchange, and then the high-temperature flue gas is mixed with the flue gas discharged from the top of the kiln along the heat exchange air pipe 14 through the outlet valve 14-2 in the flue gas pipeline 9 at the top of the kiln, so that the integral increase of the temperature of the flue gas is realized, the temperature of the flue gas entering the flue gas dust collector 11 is not lower than 170 ℃, the requirements on desulfurization and denitrification temperature are met, and cloth bag hardening of the dust collector can also be avoided. When the temperature of the gas entering the flue gas dust collector 11 exceeds 200 ℃, the mixing cooling air valve 16 is opened, and cooling air is mixed, so that the operation safety of the flue gas dust collector 11 is ensured. After the direction is changed, when the second kiln chamber 3 is calcined, a second valve 13-2 on a cooling zone air pipe 13 connected with the middle section of a cooling zone of the second kiln chamber 3 is opened, a first valve 13-1 on the cooling zone air pipe 13 connected with the middle section of the cooling zone of the first kiln chamber 2 is closed, high-temperature flue gas which is partially combusted in the second kiln chamber 2 can fully pass through the cooling zone air pipe 13, the second valve 13-2, a heat exchange air pipe 14 and an inlet valve 14-1 to enter a heat exchanger 15, and other characteristics are the same as those of the first kiln chamber 2 in the calcining process. In the working process, the opening degrees of an inlet valve 14-1 and an outlet valve 14-2 of the heat exchanger 15 are controlled, the amount of flue gas entering the heat exchanger 15 is flexibly controlled, the temperature of the flue gas entering the flue gas dust remover 11 is adjusted, and combustion-supporting air 7 in the heat exchanger 15 is preheated. When the flue gas does not need to be heated, the inlet valve 14-1 and the outlet valve 14-2 of the heat exchanger 15, the air inlet valve 17-1 and the air outlet valve 17-2 of the combustion air branch pipe 17 can be closed, so that high-temperature gas is prevented from entering the heat exchanger 15, and the heat exchanger 15 is convenient to overhaul when in failure.
The double-hearth kiln negative pressure gas supply device can fully utilize the existing resources, realize the recovery of high-temperature gas under the condition of less equipment investment, reduce the carbon recovery cost of flue gas, and have the combined reaction condition with adsorbed materials in denitration equipment; meanwhile, the calcium carbonate content of the finished product is reduced, the calcium oxide content is improved, and the product quality is improved.
Claims (10)
1. The utility model provides a two thorax kiln negative pressure air supply unit, is including connecting the dust exhausting fan after the flue gas dust remover export, the thermocouple is installed to flue gas dust remover entrance, its characterized in that: the kiln comprises a kiln top flue gas pipeline, a first kiln chamber and a second kiln chamber, and is characterized by further comprising a cooling belt air pipe communicated with the first kiln chamber and the second kiln chamber, wherein two ends of the cooling belt air pipe are respectively connected to the middle section of the cooling belt of the first kiln chamber and the middle section of the cooling belt of the second kiln chamber, a heat exchange air pipe is connected between the cooling belt air pipe and the kiln top flue gas pipeline, and a first valve and a second valve are respectively arranged on the cooling belt air pipe between the heat exchange air pipe and the first kiln chamber and between the cooling belt air pipe and the second kiln chamber; the heat exchange air pipe is provided with a heat exchanger, the combustion-supporting air pipe is provided with a combustion-supporting air branch pipe penetrating through the heat exchanger, and the combustion-supporting air branch pipe is connected with the middle channel; and the kiln top flue gas pipeline is provided with a doped cold air valve, and the thermocouple is arranged between the doped cold air valve and the flue gas dust remover.
2. The double-hearth kiln negative pressure air supply device according to claim 1, characterized in that: and an inlet valve and an outlet valve are respectively arranged on the heat exchange air pipe at the inlet and the outlet of the heat exchanger.
3. The negative pressure air supply device for the double-hearth kiln according to claim 2, wherein: and an air inlet valve and an air outlet valve are respectively arranged on the combustion-supporting air branch pipe between the heat exchanger and the combustion-supporting air pipe and between the heat exchanger and the intermediate channel.
4. The negative pressure air supply device for the double-hearth kiln according to claim 3, wherein: the first valve and the second valve are pneumatic valves.
5. The double-hearth kiln negative pressure gas supply device according to any one of claims 1 to 4, wherein: and refractory material layers are arranged in the cooling air-carrying pipe and the heat exchange air pipe.
6. The double-hearth kiln negative pressure air supply device according to claim 5, characterized in that: the doped cold air valve is arranged between the heat exchange air pipe and the thermocouple.
7. The negative pressure air supply device for the double-hearth kiln according to claim 6, wherein: the nominal diameter of the cooling air duct and the heat exchange air duct is 1-2 m.
8. The double-hearth kiln negative pressure air supply device according to claim 7, characterized in that: the cooling air carrying pipe is horizontally arranged, and the heat exchange air pipe is vertically arranged above the cooling air carrying pipe.
9. The negative pressure air supply device for the double-hearth kiln according to claim 8, wherein: the heat exchanger is arranged on the platform of the middle channel.
10. The double-hearth kiln negative pressure air supply device according to claim 9, characterized in that: and the cooling belt air pipe is welded and sealed on the furnace shell steel structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222305015.1U CN217921861U (en) | 2022-08-31 | 2022-08-31 | Negative pressure air supply device for double-chamber kiln |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222305015.1U CN217921861U (en) | 2022-08-31 | 2022-08-31 | Negative pressure air supply device for double-chamber kiln |
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| Publication Number | Publication Date |
|---|---|
| CN217921861U true CN217921861U (en) | 2022-11-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222305015.1U Active CN217921861U (en) | 2022-08-31 | 2022-08-31 | Negative pressure air supply device for double-chamber kiln |
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| CN (1) | CN217921861U (en) |
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2022
- 2022-08-31 CN CN202222305015.1U patent/CN217921861U/en active Active
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