CN215627653U - Low-calorific-value fuel flue gas system suitable for double-hearth kiln - Google Patents
Low-calorific-value fuel flue gas system suitable for double-hearth kiln Download PDFInfo
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- CN215627653U CN215627653U CN202122336413.5U CN202122336413U CN215627653U CN 215627653 U CN215627653 U CN 215627653U CN 202122336413 U CN202122336413 U CN 202122336413U CN 215627653 U CN215627653 U CN 215627653U
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Abstract
A low-heat value fuel smoke system suitable for a double-hearth kiln relates to the technical field of double-hearth kilns in industrial kilns. The kiln comprises a double-chamber kiln body, wherein a kiln chamber A annular channel and a kiln chamber B annular channel are respectively formed in the double-chamber kiln body, a middle channel is formed between the kiln chamber A annular channel and the kiln chamber B annular channel, the top of the middle channel is provided with an air outlet, the air outlet is connected with an air inlet end of a heat exchanger through a high-temperature flue gas pipeline, and an air outlet end of the heat exchanger is connected with an air inlet of the middle channel through a high-temperature combustion-supporting air pipeline. The invention has simple and reliable structure, reduces the amount of flue gas to the kiln top by leading excessive high-temperature flue gas in the kiln out of the kiln, effectively reduces the pressure in the kiln, reduces the temperature of the kiln top, solves the problem that the double-hearth kiln uses low-heat-value fuel, effectively utilizes the heat of the led high-temperature flue gas through the heat exchange system, and reduces the energy consumption of the double-hearth kiln.
Description
Technical Field
The invention relates to the technical field of double-hearth kilns in industrial kilns, in particular to a low-calorific-value fuel smoke system used for the double-hearth kilns.
Background
The double-hearth kiln has the characteristics of low heat consumption, simple operation and good product quality, is one of the recommended main kiln types in the industry at present, and is constructed and used by a large number of metallurgical enterprises. However, the low-calorific-value fuel represented by blast furnace gas cannot meet the use requirement all the time, and meanwhile, the low-calorific-value fuel is the most abundant fuel for metallurgical enterprises, so that the problem that the low-calorific-value fuel is used by a double-hearth kiln is urgently needed to be solved at present.
The double-chamber kiln is provided with two chambers, each chamber is provided with an annular channel below, and the two annular channels are connected through a middle channel. One chamber is used as a combustion chamber during production, the other chamber is used as a heat storage chamber, the reversing is performed once every 12-30 minutes, after the reversing is completed, the original combustion chamber is used as the heat storage chamber, and the original heat storage chamber is used as the combustion chamber. Combustion-supporting air and fuel enter a combustion chamber from the upper part, flue gas generated after the materials are calcined enters an annular channel of the chamber, then enters an intermediate channel, then enters an annular channel of a heat storage chamber, flows from bottom to top in the heat storage chamber to preheat limestone, and finally is discharged out of a kiln to enter a waste gas treatment system.
Publication No. CN108355420A discloses a lime kiln flue gas recirculation system, which utilizes flue gas circulation to recover and recycle waste heat, improves the thermal efficiency of the lime kiln, reduces the oxygen partial pressure in the kiln, inhibits the generation of NOx, and reduces the atmospheric pollution. The lime kiln is provided with a flue gas outlet. The waste gas discharge system comprises a dust remover, a dust removing fan and a chimney, and a flue gas outlet of the lime kiln is connected to the chimney through the dust remover and the dust removing fan in sequence. The lime kiln is equipped with recirculation flue gas entry, and lime kiln flue gas recirculation system is equipped with flue gas processing apparatus, and flue gas processing apparatus includes heat exchanger, gas cleaning ware, buffer tank and fan, and the heat exchanger is connected to the buffer tank through gas cleaning ware, and the buffer tank is connected to the fan entry. One path of the outlet of the dust removal fan is connected to the heat exchanger through an inlet pipeline, and the outlet of the fan is connected to the inlet of the recirculated flue gas of the lime kiln through an outlet pipeline.
The publication No. CN109506485A discloses a waste gas waste heat utilization system of a low-heat value gas double-hearth shaft kiln, wherein a heat exchanger is additionally arranged in front of an air/waste gas reversing valve of the double-hearth shaft kiln, and heat exchange is carried out by utilizing kiln-entering combustion air and kiln-out waste gas, so that waste gas waste heat can be effectively recovered, the temperature of the kiln-out waste gas is reduced, the physical sensible heat of the combustion air is improved, and the calcining temperature is favorably improved. The technical scheme is as follows: the system for utilizing the waste gas waste heat of the low-calorific-value gas double-hearth shaft kiln comprises an A hearth air/waste gas reversing valve, a B hearth air/waste gas reversing valve, an A hearth air/waste gas heat exchanger, a B hearth air/waste gas heat exchanger and an air reversing valve, and is characterized in that the air reversing valve is arranged on a kiln combustion-supporting air main pipe, divides the combustion-supporting air main pipe into two parts, divides the combustion-supporting air main pipe into an A calcining kiln hearth and a B calcining kiln hearth, is respectively connected with air inlets of the A hearth air/waste gas heat exchanger and the B hearth air/waste gas heat exchanger, and is respectively connected with air inlets of the A hearth air/waste gas reversing valve and the B hearth air/waste gas reversing valve after heat exchange; and the waste gas outlet pipeline/combustion-supporting air inlet pipeline of the calcining kiln chamber A and the calcining kiln chamber B is respectively connected with the waste gas inlets of the air/waste gas heat exchanger of the chamber A and the air/waste gas heat exchanger of the chamber B, is connected with the waste gas inlets of the air/waste gas reversing valve of the chamber A and the air/waste gas reversing valve of the chamber B after heat exchange, and is led to a dust remover and a smoke exhaust chimney for smoke and dust removal after the waste gas outlet pipelines of the air/waste gas reversing valve of the chamber A and the air/waste gas reversing valve of the chamber B are converged.
The production process enables the double-hearth kiln to maintain positive pressure in the kiln all the time during production, and if the smoke gas amount is too large, the pressure in the kiln is too high and exceeds the pressure resistance of equipment, so that the production is difficult to carry out. Too large amount of flue gas can also cause the flue gas temperature to be unable to reduce to normal temperature range after the lime stone in preheating the heat accumulation thorax, causes kiln crown temperature too high, also can cause production to be difficult to normally go on. Low-calorific-value fuels such as blast furnace gas, converter gas with lower calorific value and the like have low calorific value, so that the using amount of the low-calorific-value fuels is large when the low-calorific-value fuels are used, the smoke gas amount in a kiln exceeds a normal level, the problems of overhigh pressure in the kiln and overhigh temperature of the top of the kiln are caused, the production cannot be carried out, and the production requirements cannot be met.
Disclosure of Invention
The invention provides a low-calorific-value fuel flue gas system suitable for a double-hearth kiln, which is simple in structure, reduces the total amount of flue gas in the double-hearth kiln, solves the problem of overlarge flue gas amount when low-calorific-value fuel is used, and effectively reduces the energy consumption of the double-hearth kiln.
The utility model provides a low heat value fuel flue gas system suitable for double chamber kiln uses, includes the double chamber kiln body, and the double chamber kiln is internal to form kiln chamber A annular passage, kiln chamber B annular passage respectively, forms intermediate channel between kiln chamber A annular passage, the kiln chamber B annular passage, sets up the gas outlet on the lateral wall of intermediate channel, the gas outlet passes through the high temperature flue gas pipeline to be connected with the income gas end of heat exchanger, the end of giving vent to anger of heat exchanger is connected with the income gas port of intermediate channel through the combustion-supporting wind pipeline of high temperature.
Preferably, the middle channel of the double-chamber kiln body is connected with the heat exchanger through a high-temperature flue gas pipeline.
Preferably, the heat exchanger of the invention is connected to the blast system through a low-temperature combustion-supporting air duct.
Preferably, the upper end of the double-chamber kiln body is connected with a flue gas treatment system through an exhaust gas pipeline.
Preferably, the heat exchanger of the present invention is connected to the exhaust gas duct by a low temperature flue gas duct.
Preferably, the low-temperature flue gas pipeline is provided with a flue gas regulating valve.
When the low-calorific-value fuel flue gas system applicable to the double-hearth kiln is used, after the flue gas in the combustion hearth passes through the combustion hearth annular channel, a part of the flue gas enters the intermediate channel, then enters the heat storage hearth annular channel, then enters the heat storage hearth to preheat limestone, and finally enters the waste gas pipeline from the top of the kiln; the other part of the flue gas enters a high-temperature flue gas pipeline and then enters a heat exchanger, the temperature of the flue gas is reduced after heat exchange, and then the flue gas enters a low-temperature flue gas pipeline and then enters a waste gas pipeline to be mixed with the flue gas in the waste gas pipeline and then enters a waste gas treatment system. The flue gas volume entering the heat exchanger is adjusted by adjusting the opening of the flue gas adjusting valve so as to fully meet the requirement of preheating limestone in the heat storage chamber.
It should be pointed out that the high-temperature flue gas is also suitable for exchanging heat with low-heat value fuel, and the heat exchanger is connected with a fuel system at the moment.
By adopting the technical scheme, compared with the prior art, the invention has the following advantages:
a part of waste gas of the invention is led out from the middle channel of the two chambers, and the temperature of the waste gas is as high as about 900 ℃, which is much higher than the temperature of the waste gas at the top of the kiln. The extracted waste gas does not need to enter another chamber, so that the waste gas amount entering the other chamber is reduced, the temperature of the part of waste gas entering the preheating chamber after the waste gas is reduced and the part of waste gas reaches the kiln top after the waste gas exchanges heat with stone materials is lower, the operation environment of the kiln top is facilitated, otherwise, the kiln top cannot operate at the temperature of four or five hundred degrees. Compared with the prior art, the method has the advantages that the problem that the temperature of the kiln top is high due to the fact that the waste gas is led to the kiln top is solved, and the problem of high kiln pressure can be solved fundamentally.
The invention provides a flue gas system suitable for a double-hearth kiln to use low-calorific-value fuel, and solves the problem that the double-hearth kiln uses the low-calorific-value fuel. By leading out a part of high-temperature flue gas from the middle channel, the total amount of the flue gas in the double-hearth kiln is reduced, and the problem of overlarge flue gas amount when low-calorific-value fuel is used is solved, so that the normal production of the low-calorific-value fuel used by the double-hearth kiln is ensured. The amount of the high-temperature flue gas led out is adjusted by using the flue gas adjusting valve, so that the double-hearth kiln can effectively adapt to the change of the heat value of the fuel during production. The heat exchanger is used for exchanging heat between the led-out high-temperature flue gas and combustion-supporting air or low-calorific-value fuel, and the heat returns to the kiln through the combustion-supporting air or coal gas, so that the energy consumption of the double-hearth kiln can be effectively reduced.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention.
Wherein: 1-high temperature flue gas pipeline, 2-double-chamber kiln body, 3-kiln chamber A annular channel, 4-intermediate channel, 5-low temperature combustion-supporting air pipeline, 6-waste gas pipeline, 7-low temperature flue gas pipeline, 8-flue gas regulating valve, 9-heat exchanger, 10-high temperature combustion-supporting air pipeline and 11-kiln chamber B annular channel.
Detailed Description
The technical scheme of the invention is explained in detail in the following with the accompanying drawings:
as shown in figure 1, a low-calorific-value fuel flue gas system suitable for a double-hearth kiln comprises a double-hearth kiln body 2, a kiln hearth A annular channel 3 and a kiln hearth B annular channel 11 are formed in the double-hearth kiln body 2 respectively, an intermediate channel 4 is formed between the kiln hearth A annular channel 3 and the kiln hearth B annular channel 11, a gas outlet is formed in the side wall of the intermediate channel 4, the gas outlet is connected with the gas inlet end of a heat exchanger 9 through a high-temperature flue gas pipeline 1, and the gas outlet end of the heat exchanger 9 is connected with the gas inlet end of the intermediate channel 4 through a high-temperature combustion-supporting air pipeline 10.
As shown in fig. 1, the middle channel 4 of the double-chamber kiln body 2 of the invention is connected with a heat exchanger 9 through a high-temperature flue gas pipeline 1.
As shown in fig. 1, the heat exchanger 9 of the present invention is connected with a blast system through a low-temperature combustion-supporting air pipeline 5.
As shown in fig. 1, the upper end of the double-chamber kiln body 2 of the invention is connected with a flue gas treatment system through an exhaust gas pipeline 6.
As shown in fig. 1, the heat exchanger 9 of the present invention is connected to the exhaust gas duct 6 through the low temperature flue gas duct 7.
As shown in fig. 1, a flue gas regulating valve 8 is arranged on the low-temperature flue gas pipeline 7 of the invention.
A flue gas system suitable for a double-hearth kiln to use low-calorific-value fuel comprises a double-hearth kiln body 2, an annular channel, a middle channel 4, a high-temperature flue gas pipeline 1, a low-temperature flue gas pipeline 7, a flue gas regulating valve 8, a high-temperature combustion-supporting air pipeline 10, a low-temperature combustion-supporting air pipeline 5, a heat exchanger 9 and a waste gas pipeline 6. Wherein, the high-temperature flue gas pipeline 1 is internally built with refractory materials, one end of the high-temperature flue gas pipeline is connected with the middle channel, and the other end of the high-temperature flue gas pipeline is connected with the heat exchanger 9. One end of the low-temperature flue gas pipeline 7 is connected with the heat exchanger 9, and the other end is connected with the waste gas pipeline 6. The flue gas regulating valve 8 is arranged on the low-temperature flue gas pipeline 7. One end of the waste gas pipeline 6 is connected with the double-chamber kiln body, and the other end is connected with a waste gas treatment system. One end of a high-temperature combustion-supporting air pipeline 10 is connected with the double-chamber kiln body, and the other end of the high-temperature combustion-supporting air pipeline is connected with the heat exchanger 9. One end of the low-temperature combustion-supporting air pipeline 5 is connected with the heat exchanger 9, and the other end of the low-temperature combustion-supporting air pipeline is connected with the air blowing system. When in use, after the flue gas in the combustion chamber passes through the combustion chamber annular channel, a part of the flue gas enters the intermediate channel 4, then enters the heat storage chamber annular channel, then enters the heat storage chamber to preheat limestone, and finally enters the waste gas pipeline 6 from the kiln top; the other part of the flue gas enters the high-temperature flue gas pipeline 1, then enters the heat exchanger 9, the temperature of the flue gas is reduced after heat exchange, then the flue gas enters the low-temperature flue gas pipeline 7, then enters the waste gas pipeline 6, and enters the waste gas treatment system after being mixed with the flue gas in the waste gas pipeline 6. The flue gas volume entering the heat exchanger 9 is adjusted by adjusting the opening of the flue gas adjusting valve so as to fully meet the preheating requirement of limestone in the heat storage chamber.
Claims (6)
1. The utility model provides a low heat value fuel flue gas system suitable for two thorax kilns use which characterized in that includes two thorax kiln bodies (2), forms kiln thorax A annular passage (3), kiln thorax B annular passage (11) in two thorax kiln bodies (2) respectively, forms intermediate channel (4) between kiln thorax A annular passage (3), kiln thorax B annular passage (11), sets up the gas outlet on the lateral wall of intermediate channel (4), the gas outlet passes through high temperature flue gas pipeline (1) and is connected with the income gas end of heat exchanger (9), the end of giving vent to anger of heat exchanger (9) is connected with the income gas port of intermediate channel (4) through high temperature combustion-supporting air duct (10).
2. The low heating value fuel flue gas system suitable for the double-hearth kiln according to claim 1, wherein the middle passage (4) of the double-hearth kiln body (2) is connected with the heat exchanger (9) through the high temperature flue gas pipeline (1).
3. A low heating value fuel flue gas system suitable for use in a dual hearth kiln according to claim 1 wherein the heat exchanger (9) is connected to the blast system by a low temperature combustion air duct (5).
4. A low heating value fuel flue gas system suitable for use in a dual-chamber kiln as claimed in claim 1, wherein the upper end of the dual-chamber kiln body (2) is connected to the flue gas treatment system by means of a flue gas duct (6).
5. A low heating value fuel flue gas system suitable for use in a dual hearth kiln according to claim 3, characterised in that the heat exchanger (9) is connected to the flue gas duct (6) by a low temperature flue gas duct (7).
6. A low heating value fuel flue gas system suitable for use in a dual hearth kiln according to claim 4, wherein the low temperature flue gas duct (7) is provided with a flue gas regulating valve (8).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122336413.5U CN215627653U (en) | 2021-09-26 | 2021-09-26 | Low-calorific-value fuel flue gas system suitable for double-hearth kiln |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122336413.5U CN215627653U (en) | 2021-09-26 | 2021-09-26 | Low-calorific-value fuel flue gas system suitable for double-hearth kiln |
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| CN215627653U true CN215627653U (en) | 2022-01-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114524628A (en) * | 2022-02-28 | 2022-05-24 | 中冶长天国际工程有限责任公司 | Double-hearth lime kiln system without dust leakage and pressure relief method |
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2021
- 2021-09-26 CN CN202122336413.5U patent/CN215627653U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114524628A (en) * | 2022-02-28 | 2022-05-24 | 中冶长天国际工程有限责任公司 | Double-hearth lime kiln system without dust leakage and pressure relief method |
| CN114524628B (en) * | 2022-02-28 | 2023-10-03 | 中冶长天国际工程有限责任公司 | Double-chamber lime kiln system without dust leakage and pressure relief method |
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