CN213841811U

CN213841811U - Kiln flue gas waste heat recycling device

Info

Publication number: CN213841811U
Application number: CN202023017039.4U
Authority: CN
Inventors: 何敏; 吕志伟; 董正强; 周琛; 江链
Original assignee: Hunan Changyuan Lico Co Ltd; Jinchi Energy Materials Co Ltd
Current assignee: Hunan Changyuan Lico Co Ltd; Jinchi Energy Materials Co Ltd
Priority date: 2020-12-16
Filing date: 2020-12-16
Publication date: 2021-07-30
Anticipated expiration: 2030-12-16

Abstract

The utility model relates to a flue gas waste heat utilization technical field discloses a kiln flue gas waste heat recovery utilizes device, include the heat exchanger that leads out the kiln flue gas exhaust pipe and meet with the pipe of discharging fume, be equipped with respectively on the heat exchanger and supply to carry out the gas access mouth and the gas delivery outlet that the air current that heat exchanged got into and flow with the flue gas, the air current that lets in the heat exchanger is reverse and going with the flue gas, and the medium input tube switch-on is passed through with kiln intake pipe top to the gas delivery outlet of heat exchanger. The utilization rate of the heat of gas-gas heat exchange is high, the problem that scale, impurities and the like in the water-gas heat exchange affect the heat exchange effect is not needed to be considered, and the heat exchange gas can be put into the sintering process of the kiln, so that the energy consumed by the sintering of the kiln is saved while the heat exchange is fully carried out; the gas introduced into the heat exchanger can control the gas flow in each branch pipeline in a self-feedback manner, so that the subsequent heat exchange and sintering are carried out in order, and the kiln flue gas waste heat recycling device and the kiln form a whole with energy circulation and high-efficiency utilization.

Description

Kiln flue gas waste heat recycling device

Technical Field

The utility model relates to a flue gas waste heat utilization technical field specifically, relates to a kiln flue gas waste heat recovery utilizes device.

Background

The traditional kiln flue gas waste heat is generally subjected to heat recovery and utilization through water-gas heat exchange, the generated high-temperature hot water is directly used for heating plants and living areas or refrigerating the plants and equipment rooms through a lithium bromide refrigerator, but the heat energy recovered in the mode cannot be fully utilized due to seasonal temperature difference all the year round.

In the process of water-gas heat exchange, if the water contains more impurities, the heat exchange effect is influenced; in addition, after the heat exchange tubes or heat exchange plates in the heat exchanger are cracked, medium water directly flows into a workshop or enters the interior of a kiln, so that the workload is increased slightly, and dangerous accidents are possibly caused heavily.

In addition, after the materials are sintered in the kiln, the discharged flue gas contains a large amount of small-particle dust containing alkaline substances with strong adsorbability, and the dust can seriously affect the heat exchange efficiency after being adhered to the heat exchange tube.

Disclosure of Invention

The utility model provides a technical problem lie in overcoming prior art's defect, provide a kiln flue gas waste heat recovery utilizes device that effectively reduces heat energy waste.

The purpose of the utility model is realized through the following technical scheme:

the utility model provides a kiln flue gas waste heat recovery utilizes device, includes the heat exchanger that leads out the kiln flue gas and say and meet with discharging fume, is equipped with respectively on the heat exchanger and supplies to carry out the gas access mouth and the gas delivery outlet that the air current that heat exchange was carried out to the flue gas gets into and flows out, and the air current that lets in the heat exchanger is reverse and goes with the flue gas, and the switch-on is passed through the medium input tube with kiln intake pipe top to the gas delivery outlet of heat exchanger.

Furthermore, a vent pipe is connected to the gas inlet of the heat exchanger, and a plurality of branch pipelines are arranged at the venting starting end of the vent pipe and used for introducing different types of gas.

Further, the plurality of branch lines includes an air branch line including a blower for sucking air and a first valve provided between the blower and a ventilation start end of the ventilation pipe, the first valve being opened when air is required to be introduced into the heat exchanger.

Still further, a first flow meter for monitoring the air inlet amount is arranged between the air blower and the first valve, the air blower is in signal connection with the first flow meter, and the air blower can timely adjust the air suction amount according to a flow signal fed back by the first flow meter.

Still further, many branch pipelines still include oxygen branch pipeline, are equipped with the second valve between oxygen branch pipeline and the breather pipe initial end of ventilating, and the second valve is opened when needing to let in oxygen in the heat exchanger.

Still further, the oxygen branch pipeline includes flow control valve and the second flowmeter that is used for monitoring oxygen volume of letting in, and flow control valve and second flowmeter signal connection, flow control valve can in time adjust oxygen volume of letting in according to the flow signal of second flowmeter feedback.

Furthermore, the heat exchanger is provided with an ash cleaning device and an ash cleaning port.

Compared with the prior art, the utility model discloses following beneficial effect has:

1) the utilization rate of the heat of gas-gas heat exchange is high, the problem that scale, impurities and the like in the water-gas heat exchange affect the heat exchange effect is not needed to be considered, and the heat exchange gas can be put into the sintering process of the kiln, so that the energy consumed by the sintering of the kiln is saved while the heat exchange is fully carried out;

2) the gas introduced into the heat exchanger can control the gas flow in each branch pipeline in a self-feedback manner, so that the subsequent heat exchange and sintering are carried out in order, and the kiln flue gas waste heat recycling device and the kiln form a whole with energy circulation and high-efficiency utilization.

Drawings

Fig. 1 is a schematic structural diagram of a kiln flue gas waste heat recovery and utilization device according to embodiment 1.

Detailed Description

The invention will be further described with reference to specific embodiments, wherein the drawings are designed solely for the purpose of illustration and not as a definition of the limits of the patent; for a better understanding of 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.

Example 1

The kiln flue gas waste heat recycling device comprises a smoke exhaust pipe 2 for guiding out flue gas of a kiln 1 and a heat exchanger 3 connected with the smoke exhaust pipe, wherein a gas inlet and a gas outlet for allowing gas flow for heat exchange of the flue gas to enter and flow out are respectively arranged on the heat exchanger 3, the gas flow introduced into the heat exchanger 3 is reverse to the flue gas, a heat exchange pipe 31 (also can be a heat exchange plate) is arranged in the heat exchanger 3, high-temperature flue gas passes through the heat exchange pipe 31, heat exchange medium gas passes through the outside of the heat exchange pipe 31, the tail end of the heat exchange pipe of the heat exchanger 3 is communicated with an induced draft fan 4, the induced draft fan 4 is used for introducing the high-temperature flue gas in the kiln 1 into the heat exchange pipe of the heat exchanger, the gas outlet of the heat exchanger is communicated with the beginning end of a kiln gas inlet pipe 11 through a medium input pipe 5, and heat exchange medium gas is introduced into the kiln through the medium input pipe 5 after heat exchange in the heat exchanger 3.

The bottom of the heat exchanger 3 is provided with a dust cleaning device 61 and a dust cleaning port 62, after small-particle dust in the flue gas is adhered to the heat exchange tube 31, the adhered dust can be shaken off by the dust cleaning device, and the shaken off dust can be discharged from the dust cleaning port. Specifically, the dust removing device 61 comprises a compressed air blowing pipe, when dust removal is needed to be carried out on the heat exchanger, two ends of the heat exchanger are sealed, compressed air is introduced into the heat exchanger through the compressed air blowing pipe to blow dust on the inner wall of the heat exchanger, the dust removing port is connected with the dust removing device, and the blown dust enters the dust removing device through the dust removing port to be subjected to dust removal treatment.

The gas inlet of the heat exchanger 3 is connected with a vent pipe 7, the ventilation starting end of the vent pipe is provided with a plurality of branch pipelines for introducing different types of gas, the type of the gas is selected according to the actual sintering condition of the kiln, the kiln of the embodiment sinters ternary anode materials, the introduced gas is air and oxygen generally, the branch pipelines comprise air branch pipelines and oxygen branch pipelines, and the air branch pipelines, the oxygen branch pipelines and the vent pipe are connected through a three-way joint 8 at the joint.

The air branch pipeline comprises a blower 711 for sucking air and a first valve 712 arranged between the blower and the ventilation starting end of the ventilation pipe, the first valve 712 is opened when air needs to be introduced into the heat exchanger 3, a first flow meter 713 for monitoring the air introduction amount is further arranged between the blower 711 and the first valve 712, the blower 711 is in signal connection with the first flow meter 713, and the blower 711 can adjust power in time according to a flow signal fed back by the first flow meter 713 so as to control the air suction amount.

The oxygen branch pipeline comprises a second valve 721 arranged between the pipe section of the oxygen branch pipeline and the ventilation starting end of the ventilation pipe, the oxygen branch pipeline is communicated with an oxygen tank, the second valve 721 is opened when oxygen is required to be introduced into the heat exchanger 3, the oxygen branch pipeline further comprises a flow regulating valve 722 and a second flow meter 723 used for monitoring the oxygen introduction amount, the flow regulating valve 722 is in signal connection with the second flow meter 723, and the flow regulating valve 722 can timely adjust the opening degree according to a flow signal fed back by the second flow meter 723 to control the oxygen introduction amount.

The air branch line and the oxygen branch line need to set the flow of the introduced air/oxygen in advance according to the sintering process parameters.

The kiln flue gas waste heat recovery and utilization device of the embodiment has the following working process: high-temperature flue gas generated by sintering materials in a kiln 1 enters a heat exchange tube 31 of a heat exchanger through a smoke exhaust tube 2 under the action of a draught fan 4, medium gas is introduced into the heat exchanger 3 by selecting one of branch pipelines according to actual conditions, the temperature of the high-temperature flue gas is reduced to below 200 ℃ after the high-temperature flue gas and the medium gas perform gas-gas heat exchange in the heat exchanger 3, and the temperature of the medium gas is increased to above 200 ℃; the medium gas after temperature rise is conveyed to each branch pipeline of the kiln gas inlet pipe through the medium input pipe 5 and finally enters the kiln to participate in reaction. In the process, each branch pipeline controls the introduced gas flow in real time according to set parameters and programs.

When the medium gas needs to be switched, for example between air and oxygen, the operation is as follows: when the kiln 1 is charged with oxygen, the second valve 721 of the oxygen branch pipeline is opened, and the first valve 712 of the air branch pipeline is closed; when the kiln needs to be switched to be ventilated, the first valve 712 of the air branch line is opened, and the second valve 721 of the oxygen branch line is closed.

The device for recycling the waste heat of the kiln flue gas has the advantages of effectively reducing heat energy waste, reducing production cost and the like, is simple and convenient to operate in the whole process, is suitable for industrial production, and can achieve the aims of remarkably saving energy and reducing consumption.

It should be understood that the above-mentioned embodiments are only examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A kiln flue gas waste heat recycling device is characterized by comprising a smoke exhaust pipe for guiding kiln flue gas out and a heat exchanger connected with the smoke exhaust pipe, wherein the heat exchanger is respectively provided with a gas inlet and a gas outlet for allowing gas flow for heat exchange of the flue gas to enter and flow out, and the gas flow introduced into the heat exchanger is in reverse direction with the flue gas; the gas outlet of the heat exchanger is communicated with the beginning end of the kiln gas inlet pipe through a medium input pipe.

2. The kiln flue gas waste heat recycling device according to claim 1, wherein a gas inlet of the heat exchanger is connected with a vent pipe, and a plurality of branch pipelines are arranged at the beginning of the vent pipe for introducing different types of gas.

3. The kiln flue gas waste heat recovery device according to claim 2, wherein the plurality of branch pipes include an air branch pipe, the air branch pipe includes a blower for sucking air and a first valve disposed between the blower and the ventilation starting end of the ventilation pipe, and the first valve is opened when air needs to be introduced into the heat exchanger.

4. The kiln flue gas waste heat recovery device according to claim 3, wherein a first flow meter for monitoring the air inflow amount is further arranged between the air blower and the first valve, the air blower is in signal connection with the first flow meter, and the air blower can timely adjust the air inflow amount according to a flow signal fed back by the first flow meter.

5. The kiln flue gas waste heat recycling device according to claim 3 or 4, wherein the plurality of branch pipelines further comprises an oxygen branch pipeline, a second valve is arranged between the oxygen branch pipeline and the ventilation starting end of the ventilation pipe, and the second valve is opened when oxygen needs to be introduced into the heat exchanger.

6. The kiln flue gas waste heat recycling device according to claim 5, wherein the oxygen branch line comprises a flow regulating valve and a second flow meter for monitoring the oxygen input amount, the flow regulating valve is in signal connection with the second flow meter, and the flow regulating valve can timely adjust the oxygen input amount according to a flow signal fed back by the second flow meter.

7. The kiln flue gas waste heat recovery device as claimed in claim 1, wherein the heat exchanger is provided with a dust cleaning device and a dust cleaning port.