CN216404224U

CN216404224U - Double-chamber kiln channel ventilation device

Info

Publication number: CN216404224U
Application number: CN202122924069.1U
Authority: CN
Inventors: 李磊; 魏广平; 黄升; 唐文华; 张领; 陈小勇; 于海; 韦炳扬; 全劲松; 甘幸; 黄锦
Original assignee: Guangxi Liugang New Material Technology Co ltd; Guangxi Liuzhou Iron and Steel Group Co Ltd
Current assignee: Guangxi Liugang New Material Technology Co ltd; Guangxi Liuzhou Iron and Steel Group Co Ltd
Priority date: 2021-11-26
Filing date: 2021-11-26
Publication date: 2022-04-29
Anticipated expiration: 2031-11-26

Abstract

The utility model discloses a ventilation device for a middle channel of a double-hearth kiln, belonging to the technical field of ferrous metallurgy, comprising a kiln hearth A provided with an annular channel A and a kiln hearth B provided with an annular channel B, wherein the kiln hearth A and the kiln hearth B are communicated with each other through the middle channel, the utility model discloses a double-chamber kiln, which comprises a middle passage, a gas pipe, a heat exchanger, a dust remover, a gas pipe, a heat exchanger, a thermocouple, a control system and an ignition burner nozzle, wherein the upper part of the middle passage is provided with the ignition burner nozzle, the ignition burner nozzle is connected with the gas pipe and a combustion-supporting air pipe, the A annular passage is connected with the A connecting air pipe, the B annular passage is connected with the B connecting air pipe, the A connecting air pipe and the B connecting air pipe are both connected with the ventilation pipe, the ventilation pipe is sequentially connected with the heat exchanger and the dust remover, the gas pipe and the combustion-supporting air pipe penetrate through the heat exchanger, the thermocouple is arranged between the dust remover and the heat exchanger, the cold air mixing valve is arranged between the thermocouple and the heat exchanger, and the cold air mixing valve and the thermocouple are both connected with the control system.

Description

Double-chamber kiln channel ventilation device

Technical Field

The utility model belongs to the technical field of ferrous metallurgy, and relates to a ventilation device for a middle channel of a double-hearth kiln.

Background

The double-hearth kiln is provided with two hearths, namely a calcining hearth and a heat storage hearth, and two kiln cylinders are alternately exchanged for calcining. The reversing is carried out every 12-14 minutes, and the functions of the two kiln chambers are interchanged. During production, combustion-supporting air enters the kiln chamber from the top of the kiln chamber A through a combustion-supporting air reversing valve, flows downwards, is preheated after passing through high-temperature limestone, and is mixed and combusted with coal gas conveyed by the spray gun when reaching a calcining zone. The burnt flue gases move downwards together with the limestone until the end of the calcining zone completes the combustion. Cooling air and generated lime products are subjected to heat exchange in an area below the channel, then enter the kiln chamber B together with combustion flue gas through the annular channel and the middle channel, preheat stones which just enter the kiln together with the cooling air from bottom to top, and then are discharged into a flue gas dust remover from a flue gas pipeline at the top of the kiln. And after the limestone in the kiln chamber B absorbs the waste heat of the flue gas, the temperature is increased. And after one period is finished, opening a combustion air release valve and a cooling air release valve to release the pressure in the kiln. Various air flows and media, such as combustion air, lime cooling air, coal dust and the like stop supplying into the kiln. The reversing valve device acts to realize the switching between the combustion chamber and the preheating chamber and create conditions for new one-period combustion.

The double-hearth kiln has the advantages of low energy consumption, excellent product quality and the like, and the intermediate channel is an important prerequisite for realizing the parallel-flow heat storage process. When the double-hearth kiln operates normally, the flue gas calcined by the double-hearth kiln flows through the middle channel to realize heat storage of the heat storage hearth. During production, limestone in the kiln is decomposed to generate a large amount of lime powder. And under the action of high-temperature airflow, the dust crushed stone flows along the flue gas, passes through the intermediate channel and the annular channel, and then enters the heat storage chamber. As the pressure of the kiln is reduced to zero during the reversing or stopping of the kiln, dust impurities are accumulated and settled or adhered to the bottom of the channel platform under the action of gravity. The dust falls on the surface of the middle channel due to dead weight, is combined and deposited on the annular channel and the middle channel under the action of high temperature, gradually blocks the annular channel and the middle channel, and airflow is difficult to smoothly enter the heat storage chamber through the channels. The phenomena of kiln pressure rise, high pipeline pressure of a pressurizer and high rotating speed of the pressurizer occur due to unsmooth airflow of the kiln. The product quality is deteriorated due to the fact that airflow in the kiln is not smooth and heat storage is not sufficient, the working condition of the kiln is finally deteriorated, and the set productivity is forced to be reduced. The influence of blockage of a middle channel of the kiln is caused, the quality of a kiln product is influenced by partial growth, low set productivity and the like due to insufficient heat exchange, and the kiln can only be stopped for maintenance and cleaning, so that the production operation efficiency of the kiln is not favorably exerted.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a ventilation device for a middle channel of a double-hearth kiln, which solves the problem that the production operation is influenced by the reduction of productivity caused by the blockage of the middle channel of the existing double-hearth kiln.

In order to solve the problems, the utility model adopts the technical scheme that: the kiln comprises a kiln chamber A with an annular passage A and a kiln chamber B with an annular passage B, wherein the kiln chamber A and the kiln chamber B are communicated with each other through an intermediate passage, an ignition burner is arranged at the upper part of the intermediate passage, the ignition burner is connected with a gas pipe and a combustion-supporting air pipe, the annular passage A is connected with a connecting air pipe A, the annular passage B is connected with a connecting air pipe B, the connecting air pipe A and the connecting air pipe B are both connected with a vent pipe, the vent pipe is sequentially connected with a heat exchanger and a dust remover, the gas pipe and the combustion-supporting air pipe penetrate through the heat exchanger, the gas pipe and the combustion-supporting air pipe can be preheated and increased, the temperature of flue gas in the vent pipe is reduced, a thermocouple is arranged between the dust remover and the heat exchanger, and the thermocouple is used for monitoring the temperature of the flue gas entering the dust remover, and a cold air mixing valve is arranged between the thermocouple and the heat exchanger, the cold air mixing valve and the thermocouple are both connected with a control system, and when the temperature monitored by the thermocouple is higher, the control system controls the cold air mixing valve to be opened for cooling.

In the above technical solution, a more specific technical solution may also be: the two ends of the heat exchanger are respectively provided with an air inlet stop valve and an air outlet stop valve, the air outlet stop valve is positioned between the doped cold air valve and the heat exchanger, and the air inlet stop valve and the air outlet stop valve are connected with the control system.

Further: the ventilation pipe, the A connecting air pipe and the B connecting air pipe are of three-layer structures and respectively comprise high-alumina bricks, insulating bricks and heat insulating plates from inside to outside.

Due to the adoption of the technical scheme, compared with the prior art, the utility model has the following beneficial effects: the kiln chamber A and the kiln chamber B are additionally communicated through the connecting air pipe A and the annular channel B, and when one of the middle channel, the annular channel A or the annular channel B is blocked, flue gas can be discharged into an external dust remover through the vent pipe, so that smooth ventilation of the two chambers is ensured, and the normal operation of the working principle of parallel-flow heat storage of the double-chamber kiln is ensured; when the weather temperature is low, the preheating and temperature rising of the gas pipe and the combustion-supporting air pipe are realized by utilizing the heat of the flue gas in the kiln through the heat exchanger.

Drawings

FIG. 1 is a simplified diagram of the piping of the present invention.

Figure 2 is a schematic view of the vent connection of the present invention.

Fig. 3 is a top view of fig. 2.

FIG. 4 is a cross-sectional view of the vent of the present invention.

Fig. 5 is a left side view of fig. 4.

In the figure: 1. a vent pipe; 11. a is connected with an air pipe; 12. b is connected with an air pipe; 13. a heat insulation plate; 14. insulating bricks; 15. high-alumina bricks; 2. a, a kiln chamber; 21. a, an annular channel; 3. b, a kiln chamber; 31. b, an annular channel; 4. a combustion-supporting air duct; 5. a gas pipe; 6. a heat exchanger; 61. an air inlet stop valve; 62. an air outlet stop valve; 7. a dust remover; 71. a thermocouple; 72. mix the cold blast gate.

Detailed Description

The utility model will be further described in detail with reference to the following examples of the drawings:

the double-hearth kiln middle channel ventilation device shown in fig. 1 to 5 comprises an A kiln chamber 2 provided with an A annular channel 21 and a B kiln chamber 3 provided with a B annular channel 31, the A kiln chamber 2 and the B kiln chamber 3 are communicated with each other through the middle channel, an ignition burner is arranged at the upper part of the middle channel, the ignition burner is connected with a gas pipe 5 and a combustion-supporting air pipe 4, the A annular channel 21 is connected with an A connecting air pipe 11, the B annular channel 31 is connected with a B connecting air pipe 12, the A connecting air pipe 11 and the B connecting air pipe 12 are both connected with a ventilation pipe 1, the ventilation pipe 1 is sequentially connected with a heat exchanger 6 and a dust remover 7, the gas pipe 5 and the combustion-supporting air pipe 4 penetrate through the heat exchanger 6, the gas pipe 5 and the combustion-supporting air pipe 4 can be preheated and increased in temperature, the smoke in the ventilation pipe 1 is reduced in temperature, a thermocouple 71 is arranged between the dust remover 7 and the heat exchanger 6, and the thermocouple 71 is used for monitoring the temperature of the smoke entering the dust remover 7, a mixed cooling air valve 72 is arranged between the thermocouple 71 and the heat exchanger 6, the mixed cooling air valve 72 and the thermocouple 71 are both connected with a control system, and when the temperature monitored by the thermocouple 71 is higher, the control system controls the mixed cooling air valve 72 to be opened for cooling. The both ends of heat exchanger 6 are equipped with air inlet stop valve 61 and air-out stop valve 62 respectively, and air-out stop valve 62 is located and mixes between cold blast gate 72 and the heat exchanger 6, and air inlet stop valve 61 and air-out stop valve 62 all link to each other with control system. The ventilation pipe 1, the A connecting air pipe 11 and the B connecting air pipe 12 are all of three-layer structures, and respectively comprise a high-alumina brick 15, a heat-insulating brick 14 and a heat-insulating plate 13 from inside to outside.

When middle passageway blocks up, A annular passage 21 or B annular passage 31 blocks up, open air inlet stop valve 61 and air-out stop valve 62, realize the external intercommunication of two thorax of A kiln thorax 2 and B kiln thorax 3, the flue gas accessible ventilation pipe 1 after the burning preheats gas pipe 5, the combustion-supporting wind that gets into in the kiln through heat exchanger 6. When the gas pipe 5 and the combustion-supporting air need to be preheated, the air inlet stop valve 61 and the air outlet stop valve 62 can be opened, so that the flue gas in the kiln enters the flue gas dust remover 7 through the vent pipe 1 and the heat exchanger 6.

Claims

1. The utility model provides a double chamber kiln intermediate passage ventilation unit, is including the A kiln thorax that is equipped with A annular passage and the B kiln thorax that is equipped with B annular passage, the A kiln thorax with communicate each other through the intermediate passage between the B kiln thorax the upper portion of intermediate passage is equipped with the ignition nozzle, the ignition nozzle is connected its characterized in that with gas pipe and combustion-supporting tuber pipe: the air-conditioning system is characterized in that the annular channel A is connected with the air connecting pipe A, the annular channel B is connected with the air connecting pipe B, the air connecting pipe A and the air connecting pipe B are connected with the ventilating pipe, the ventilating pipe is sequentially connected with the heat exchanger and the dust remover, the gas pipe and the combustion-supporting air pipe penetrate through the heat exchanger, a thermocouple is arranged between the dust remover and the heat exchanger, a cold air mixing valve is arranged between the thermocouple and the heat exchanger, and the cold air mixing valve and the thermocouple are connected with a control system.

2. The intermediate passage ventilation apparatus for a dual-bore kiln as set forth in claim 1, wherein: the two ends of the heat exchanger are respectively provided with an air inlet stop valve and an air outlet stop valve, the air outlet stop valve is positioned between the doped cold air valve and the heat exchanger, and the air inlet stop valve and the air outlet stop valve are connected with the control system.

3. The intermediate passage ventilation apparatus for a dual-bore kiln as set forth in claim 1 or 2, wherein: the ventilation pipe, the A connecting air pipe and the B connecting air pipe are of three-layer structures and respectively comprise high-alumina bricks, insulating bricks and heat insulating plates from inside to outside.