CN217973019U

CN217973019U - Active lime kiln capable of being monitored in real time

Info

Publication number: CN217973019U
Application number: CN202222293424.4U
Authority: CN
Inventors: 柯有平; 蔡礼忠; 杨裕中; 常治超; 祝文剑
Original assignee: Jiujiang Yingxiang Minerals Co ltd
Current assignee: Jiujiang Yingxiang Minerals Co ltd
Priority date: 2022-08-30
Filing date: 2022-08-30
Publication date: 2022-12-06
Anticipated expiration: 2032-08-30

Abstract

The utility model discloses a but real time monitoring's active lime kiln, including kiln main part, feeding temporary storage box, ejection of compact temporary storage box and ejection of compact temporary storage box, kiln main part includes feeding preheating section, calcination section, heat preservation section, ejection of compact cooling zone down in proper order from last, feeding temporary storage box inner chamber fixed welding has first heat transfer board, feeding preheating section installs feed passage with feeding temporary storage box inner chamber upper portion intercommunication, and feeding preheating section and feeding temporary storage box inner chamber lower part intercommunication install first smoke exhaust connecting pipe, feeding temporary storage box inner chamber lower part one side intercommunication is installed the second and is discharged fume connecting pipe one end, and outside fixed mounting has the heat transfer case on the second is discharged fume the connecting pipe. Has the advantages that: the utility model discloses be provided with first heat transfer board, second heat transfer board and heat transfer case, realized carrying out recycle to the waste heat in the high temperature flue gas during the use, but make a real time monitoring's active lime kiln use energy-concerving and environment-protective more.

Description

Active lime kiln capable of being monitored in real time

Technical Field

The utility model relates to a lime kiln technical field particularly, relates to a but real time monitoring's active lime kiln.

Background

A kiln for calcining lime stone to decompose it into calcium lime and carbon dioxide under high-temp condition is composed of lime kiln (if gas fuel is fed in via pipeline and burner), lime stone and fuel, preheating at 850 deg.C, decomposing at 1200 deg.C, cooling and discharging.

The prior art discloses that the publication number is: CN216998197U novel vertical gas burns limekiln, including feed mechanism, the kiln body, discharge mechanism, from the top down has set gradually the preheating section in the kiln body, calcine the section, the heat preservation section, the fast cooling section, go out grey temporary storage bin's bottom and install the ash gate, the pulse nozzle that ring distribution was more than two-layer on the section of calcining, the surface of the kiln body is located the below of fast cooling section, the cooling blower is installed to the top department of going out grey temporary storage bin, the cooling air outlet pipe is installed to one side top of fast cooling section, the price of shaft kiln has been utilized, the product of rotary kiln has been produced, lower overfire rate has been guaranteed, improve the activity of lime, greatly reduced running cost and maintenance cost.

Traditional lime kiln can produce the sulphur flue gas that contains of high temperature at the during operation, direct emission can pollute the atmospheric environment, be not conform to green's production theory, need use dust and the sulphur harmful gas that contains in the flue gas of desulfurizing tower and sack cleaner for this reason, nevertheless directly handle high temperature flue gas, not only can reduce the desulfurization effect of desulfurizing tower, shorten the life of desulfurizing tower and sack cleaner, but also can make a large amount of heat energy extravagant.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

Not enough to prior art, the utility model provides a but real time monitoring's active lime kiln possesses and carries out recycle to the waste heat in the high temperature flue gas, uses more energy-conserving advantage, and then solves the problem among the above-mentioned background art.

(II) technical scheme

In order to realize the aforesaid can carry out recycle to the waste heat in the high temperature flue gas, use more energy-conserving advantage, the utility model discloses a concrete technical scheme as follows: the utility model provides a but real time monitoring's active lime kiln, includes kiln main part, feeding temporary storage case, ejection of compact temporary storage case and ejection of compact temporary storage case, the kiln main part is from last to including feeding preheating section, calcination section, heat preservation section, ejection of compact cooling section down in proper order, feeding temporary storage case inner chamber fixed welding has first heat transfer board, feeding preheating section installs feedstock channel with feeding temporary storage case inner chamber upper portion intercommunication, and feeding preheating section and feeding temporary storage case inner chamber lower part intercommunication install first exhaust connecting pipe, feeding temporary storage case inner chamber lower part one side intercommunication is installed the second and is discharged fume connecting pipe one end, and outside fixed mounting has the heat transfer case on the second discharge fume the connecting pipe to the second is discharged fume the connecting pipe other end intercommunication and is connected with the sack cleaner, sack cleaner one side is discharged fume the connecting pipe intercommunication through the third and is connected with the desulfurizing tower, calcination section and heat preservation section one side fixed mounting have the pulse nozzle, and pulse nozzle one end intercommunication is connected with the pipe to the gas advances the pipe to the pipe and is located heat transfer case inner chamber part intercommunication connection and installs spiral heat exchange tube, ejection of compact temporary storage case inner chamber, ejection of compact air is connected with first heat exchange tube intercommunication, ejection of compact air is installed on one side of compact temporary storage case inner chamber, ejection of compact temporary storage case inner chamber and ejection of compact air is connected with the ejection of compact air heat exchange tube intercommunication.

Furthermore, a smoke exhaust chimney is communicated and installed on one side of the desulfurization tower, a rainproof cover is fixedly installed at the top end of the smoke exhaust chimney, and a sulfur dioxide detector is installed on the inner side of the rainproof cover.

Further, an economizer and a smoke exhaust fan are respectively arranged on the second smoke exhaust connecting pipe.

Furthermore, a first thermocouple fixedly installed on the side wall of the kiln main body is arranged on one side of the calcining section, and a second thermocouple fixedly installed on the side wall of the kiln main body is arranged on one side of the heat insulation section.

Furthermore, a first temperature sensor fixedly mounted at the top of the inner cavity of the kiln body is arranged at the top of the feeding preheating section, and a second temperature sensor is mounted at one end of the inner cavity of the second smoke exhaust connecting pipe.

(III) advantageous effects

Compared with the prior art, the utility model provides a but real time monitoring's active lime kiln possesses following beneficial effect:

(1) The utility model is provided with a first heat exchange plate, a second heat exchange plate and a heat exchange box, when in use, limestone raw materials are guided into a feeding temporary storage box, when high-temperature flue gas generated in a kiln main body is guided into the bottom of an inner cavity of the feeding temporary storage box through a first smoke exhaust connecting pipe, the inner cavity of the feeding temporary storage box is fixedly provided with the first heat exchange plate, the first heat exchange plate is heated by heat in the high-temperature flue gas, thereby the limestone raw materials in the feeding temporary storage box are preliminarily preheated, the preheated limestone raw materials are guided into a feeding preheating section of the inner cavity of the kiln main body through a feeding channel to be directly contacted with the high-temperature flue gas, further preheating is carried out, so as to carry out subsequent calcination production, in addition, the bottom end of the inner cavity of the feeding temporary storage box is fixedly communicated with the second smoke exhaust connecting pipe, the outer wall of the second smoke exhaust connecting pipe is fixedly provided with the heat exchange box, the inner cavity of the heat exchange box is filled with heat exchange media, the heat exchange medium can absorb the heat of high-temperature flue gas passing through the second smoke exhaust connecting pipe to improve the temperature per se, the side walls of the calcining section and the heat preservation section of the kiln main body are respectively provided with a plurality of pulse burners, one end of each pulse burner is communicated with and provided with a gas inlet pipe, the part, located in the inner cavity of the heat exchange box, of each gas inlet pipe is connected with and provided with a spiral heat exchange pipe, combustion gas passing through the spiral heat exchange pipes can absorb the heat in the heat exchange medium to improve the temperature per se, so that the heat absorbed by the combustion of the gas in the inner cavities of the calcining section and the heat preservation section can be saved, more heat can be used for calcining and processing limestone raw materials to save gas energy, in addition, the inner cavity of the heat exchange box is fixedly provided with a first air inlet pipe, the part, located in the inner cavity of the heat exchange box, of the first air inlet pipe is also connected with and provided with the spiral heat exchange pipes, so that combustion air passing through the first air inlet pipe can also absorb the heat in the heat exchange medium to improve the temperature per se, when part of combustion-supporting air is guided into the top of the inner cavity of the discharge temporary storage box, and quicklime materials entering the bottom of the inner cavity of the discharge temporary storage box through the discharge channel exchange heat through the second heat exchange plate, the temperature of the discharged quicklime materials is reduced, the temperature of the discharged quicklime materials is further increased, and finally the part of combustion-supporting air is guided into the discharge cooling section through the second air inlet pipe.

(2) The utility model discloses be provided with first thermocouple, the second thermocouple, first temperature sensor, second temperature sensor and sulfur dioxide detector, it can real-time supervision calcine the calcination temperature in the section to install first thermocouple in the calcination section in the kiln main part, reach required calcination temperature range with the guarantee limestone raw materials, both ensure the limestone raw materials and obtain fully calcining, the phenomenon of overburning avoids appearing, the influence produces the activity, the second thermocouple is installed to heat preservation section lateral wall, the temperature in the heat preservation section can be monitored to the same principle, first temperature sensor is installed to feeding preheating section top surface, can monitor exhaust flue gas temperature, through with the second temperature sensor who installs in the second exhaust pipe, waste heat recovery effect that can real-time supervision high temperature flue gas, in order to monitoring heat exchange mechanism working conditions, and exhaust stack top fixed mounting has rain-proof lid, and the inboard sulfur dioxide monitoring with of rain-proof lid, can carry out sulfur dioxide concentration real-time supervision to the atmospheric flue gas of discharging, prevent to contain a large amount of sulfur dioxide pollution atmosphere in the exhaust flue gas, thereby, through first thermocouple, the second thermocouple, first temperature sensor, second temperature sensor and sulfur dioxide detector can carry out the active monitoring of real-time monitoring of a kind of lime, the whole operation condition of kiln, the efficient of the operation, it is stably ensured.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an active lime kiln furnace capable of real-time monitoring according to an embodiment of the present invention;

fig. 2 is an enlarged view at a of fig. 1 according to an embodiment of the present invention;

fig. 3 is an enlarged view at B of fig. 1 according to an embodiment of the present invention;

fig. 4 is a perspective view of a heat exchange box of an active lime kiln furnace capable of real-time monitoring according to an embodiment of the present invention.

In the figure:

1. a kiln main body; 101. a feed preheating section; 102. a calcination section; 103. a heat preservation section; 104. a discharging cooling section; 2. a feed temporary storage box; 3. a feed channel; 4. a discharge temporary storage box; 5. a discharge channel; 6. a heat exchange box; 7. a pulse burner; 8. a spiral heat exchange tube; 9. a gas inlet pipe; 10. a second smoke exhaust connecting pipe; 11. a first air inlet pipe; 12. a coal economizer; 13. a smoke exhaust fan; 14. a second temperature sensor; 15. a bag-type dust collector; 16. a third smoke exhaust connecting pipe; 17. a desulfurizing tower; 18. a smoke exhaust chimney; 19. a rain cover; 20. a sulfur dioxide detector; 21. a first temperature sensor; 22. a first thermocouple; 23. a second thermocouple; 24. a first heat exchange plate; 25. a first fume exhaust connecting pipe; 26. a second heat exchange plate; 27. a second air inlet pipe.

Detailed Description

To further illustrate the various embodiments, the present invention provides the accompanying drawings, which are part of the disclosure and which are primarily intended to illustrate embodiments and, together with the description, serve to explain the principles of operation of the embodiments, and, by reference to these drawings, those of ordinary skill in the art will understand the principles of the invention and its advantages, with reference to the drawings and figures, in which elements are not drawn to scale and like elements are generally designated by like reference numerals.

According to the embodiment of the utility model, but a real time monitoring's active lime kiln is provided.

Referring now to the drawings and the detailed description, as shown in fig. 1-4, a real-time monitoring active lime kiln according to an embodiment of the present invention comprises a kiln body 1, a feeding temporary storage tank 2, a discharging temporary storage tank 4 and a discharging temporary storage tank 4, the kiln body 1 sequentially comprises a feeding preheating section 101, a calcining section 102, a heat preservation section 103 and a discharging cooling section 104 from top to bottom, the inner cavity of the feeding temporary storage tank 2 is fixedly welded with a first heat exchange plate 24, the feeding preheating section 101 is communicated with the upper part of the inner cavity of the feeding temporary storage tank 2 and is provided with a feeding channel 3, the feeding preheating section 101 is communicated with the lower part of the inner cavity of the feeding temporary storage tank 2 and is provided with a first smoke exhaust connecting pipe 25, one side of the inner cavity of the feeding temporary storage tank 2 is communicated with a second smoke exhaust connecting pipe 10, the outer part of the second smoke exhaust connecting pipe 10 is fixedly provided with a heat exchange tank 6, the other end of the second smoke exhaust connecting pipe 10 is communicated with a bag dust collector 15, one side of the dust collector 15 is communicated with a desulfurizing tower 17 through a third smoke exhaust connecting pipe 16, one side of the calcining section 102 and the 103 is fixedly provided with a pulse 7, one side of the pulse storage tank 7, and the inner cavity of the second smoke exhaust temporary storage tank 10 is communicated with a gas inlet connecting pipe 9, the inner cavity of the air exchange pipe 9, the inner cavity of the air exchange pipe 11 is communicated with the discharging temporary storage tank 11 and is communicated with the air exchange pipe 9, the inner cavity of the discharging temporary storage tank 11, the waste heat in the high-temperature flue gas is recycled, so that the active lime kiln capable of being monitored in real time is more energy-saving and environment-friendly.

In one embodiment, one side of the desulfurizing tower 17 is communicated with and provided with a smoke exhaust chimney 18, the top end of the smoke exhaust chimney 18 is fixedly provided with a rain cover 19, and the inner side of the rain cover 19 is provided with a sulfur dioxide detector 20, so that the real-time monitoring of the concentration of sulfur dioxide in the smoke exhausted into the atmosphere is realized, and the exhaust smoke is prevented from containing a large amount of sulfur dioxide to pollute the atmosphere.

In one embodiment, the second smoke exhaust connecting pipe 10 is provided with an economizer 12 and a smoke exhaust fan 13, respectively, which perform a dust removal operation by pumping the cooled smoke into the inner cavity of the bag-type dust remover 15, and when the temperature of the smoke passing through the economizer 12 is still too high, the economizer 12 can be started to further recover the waste heat in the smoke.

In one embodiment, a first thermocouple 22 fixedly installed on the side wall of the kiln main body 1 is arranged on one side of the calcining section 102, a second thermocouple 23 fixedly installed on the side wall of the kiln main body 1 is arranged on one side of the heat insulating section 103, and the effect that the first thermocouple 22 and the second thermocouple 23 installed in the heat insulating section 103 and the calcining section 102 can monitor the calcining temperature in the calcining section 102 and the heat insulating section 103 in real time is achieved, so that the limestone raw material is guaranteed to reach a required calcining temperature range, full calcining of the limestone raw material is guaranteed, and overburning is avoided.

In one embodiment, the top of the feeding preheating section 101 is provided with a first temperature sensor 21 fixedly installed at the top of the inner cavity of the kiln body 1, one end of the inner cavity of the second smoke exhaust connecting pipe 10 is provided with a second temperature sensor 14, the first temperature sensor 21 is installed on the top surface of the feeding preheating section 101, the temperature of the exhausted smoke can be monitored, and the waste heat recovery effect of the high-temperature smoke can be monitored in real time through the second temperature sensor 14 installed in the second smoke exhaust pipeline, so that the working condition of the heat exchange mechanism can be monitored.

The working principle is as follows: the utility model is provided with a first heat exchange plate 24, a second heat exchange plate 26 and a heat exchange box 6, when in use, limestone raw materials are guided into a feeding temporary storage box 2, when high-temperature flue gas generated in a kiln main body 1 is guided into the bottom of an inner cavity of the feeding temporary storage box 2 through a first smoke exhaust connecting pipe 25, the inner cavity of the feeding temporary storage box 2 is fixedly provided with the first heat exchange plate 24, the first heat exchange plate 24 is heated by utilizing the heat in the high-temperature flue gas, thereby preliminarily heating the limestone raw materials in the feeding temporary storage box 2, the preheated limestone raw materials are guided into a feeding preheating section 101 of the inner cavity of the kiln main body 1 through a feeding channel 3 to be directly contacted with the high-temperature flue gas, further preheating is carried out, so as to carry out subsequent calcining production, in addition, the bottom of the inner cavity of the feeding temporary storage box 2 is fixedly communicated with and provided with the second smoke exhaust connecting pipe 10, and the outer wall of the second smoke exhaust connecting pipe 10 is fixedly provided with the heat exchange box 6, the inner cavity of the heat exchange box 6 is filled with a heat exchange medium, the heat exchange medium can absorb the heat of high-temperature flue gas passing through the second smoke exhaust connecting pipe 10 to improve the temperature of the heat exchange box, the side walls of the calcining section 102 and the heat preservation section 103 of the kiln body 1 are respectively provided with a plurality of pulse burners 7, one end of each pulse burner 7 is communicated with and provided with a gas inlet pipe 9, the part, located in the inner cavity of the heat exchange box 6, of the gas inlet pipe 9 is connected and provided with a spiral heat exchange pipe 8, combustion gas passing through the spiral heat exchange pipe 8 can absorb the heat in the heat exchange medium to improve the temperature of the heat exchange box, so that the heat absorbed by combustion of the gas in the inner cavities of the calcining section 102 and the heat preservation section 103 can be saved, more heat is used for calcining and processing of limestone raw materials to save gas energy, in addition, the inner cavity of the heat exchange box 6 is fixedly provided with a first air inlet pipe 11, and the part, located in the inner cavity of the heat exchange box 6, is also connected and provided with the spiral heat exchange pipe 8, therefore, the combustion air through the first air inlet pipe 11 can also absorb the heat in the heat exchange medium to increase the temperature of the combustion air, when the combustion air is introduced into the top of the inner cavity of the discharge temporary storage tank 4, the combustion air exchanges heat with the quick lime material entering the bottom of the inner cavity of the discharge temporary storage tank 4 through the discharge channel 5 through the second heat exchange plate 26, the temperature of the quick lime material is further increased while the temperature of the quick lime material is reduced, finally the combustion air is introduced into the discharge cooling section 104 through the second air inlet pipe 27, the high-temperature quick lime material just entering the discharge cooling section 104 can be rapidly cooled, the temperature of the quick lime material is further increased, the high-temperature combustion air can be mixed with the gas for combustion at the moment, the limestone raw material is calcined, and the temperature of the combustion air is increased, so that the absorption of the combustion air to a small amount of calcination is reduced, and the consumption of calcination heat is further reduced, in addition, the other end of the second smoke exhaust connecting pipe 10 is communicated with and provided with a bag-type dust remover 15, the second smoke exhaust connecting pipe 10 is provided with an economizer 12 and a smoke exhaust fan 13, when the temperature of the smoke passing through the economizer 12 is still overhigh, the economizer 12 can be started to further recover the waste heat in the smoke, the smoke is guided into the bag-type dust remover 15 to remove dust after cooling, then is guided into the inner cavity of a desulfurizing tower 17 through a third smoke exhaust connecting pipe 16 to carry out desulfurization and purification operation, the smoke after dust removal and desulfurization is finally discharged into the atmosphere through a smoke exhaust chimney 18, in addition, the utility model is provided with a first thermocouple 22, a second thermocouple 23, a first temperature sensor 21, a second temperature sensor 14 and a sulfur dioxide detector 20, the first thermocouple 22 is installed in the calcining section 102 in the kiln main body 1, the calcining temperature in the calcining section 102 can be monitored in real time, the limestone raw materials are guaranteed to reach a required calcining temperature range, full calcining of the limestone raw materials is guaranteed, the phenomenon of overburning is avoided, and activity is influenced, the second thermocouple 23 is installed on the side wall of the heat preservation section 103, similarly, the temperature in the heat preservation section 103 can be monitored, the first temperature sensor 21 is installed on the top surface of the feeding preheating section 101, the temperature of discharged flue gas can be monitored, the waste heat recovery effect of high-temperature flue gas can be monitored in real time through the second temperature sensor 14 installed in the second smoke exhaust pipeline, the working condition of the heat exchange mechanism is monitored, the rain-proof cover 19 is fixedly installed at the top end of the smoke exhaust chimney 18, sulfur dioxide monitoring is installed on the inner side of the rain-proof cover 19, sulfur dioxide concentration real-time monitoring can be carried out on the flue gas discharged into the atmosphere, a large amount of sulfur dioxide is prevented from polluting the atmosphere, and accordingly the whole operation condition of the active activity of the kiln can be monitored in real time through the first thermocouple 22, the second thermocouple 23, the first temperature sensor 21, the second temperature sensor 14 and the sulfur dioxide detector 20, the whole operation condition of the active activity which can be monitored in real time, and the kiln can be monitored, and the high-efficiency of the kiln can be guaranteed.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "disposed," "connected," "fixed," "screwed" and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate medium, and may be used for communicating the inside of two elements or for interacting with each other, unless otherwise specifically defined, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to the specific circumstances.

The above description is only for the preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a but real time monitoring's active lime kiln, includes kiln main part (1), feeding temporary storage case (2), ejection of compact temporary storage case (4) and ejection of compact temporary storage case (4), its characterized in that, kiln main part (1) is from last to including feeding preheating section (101), calcination section (102), heat preservation section (103), ejection of compact cooling zone (104) down in proper order, feeding temporary storage case (2) inner chamber fixed weld has first heat transfer board (24), feeding preheating section (101) and feeding temporary storage case (2) inner chamber upper portion intercommunication are installed feedstock channel (3), and feeding preheating section (101) and feeding temporary storage case (2) inner chamber lower part intercommunication install first exhaust of smoke connecting pipe (25), second exhaust fume connecting pipe (10) one end is installed in feeding temporary storage case (2) inner chamber lower part one side intercommunication, and outside fixed mounting has heat transfer case (6) on second exhaust fume connecting pipe (10) to the second exhaust fume connecting pipe (10) other end intercommunication is connected with sack cleaner (15), third exhaust fume connecting pipe (16) intercommunication is connected with desulfurization tower (17) on one side, burning gas burning section (9) fixed mounting heat transfer case (7) and burning pulse tube (7) are connected with burning nozzle (9) and burning pulse tube (7) and the burner (9) are connected to the other end of burning pulse jet burner (9) and are connected with the burning pulse jet burner (9) and are connected to be connected with the sack cleaner (9) Spiral heat exchange tube (8) are equipped with, the fixed welding of ejection of compact temporary storage case (4) inner chamber has second heat transfer board (26), discharging cooling section (104) and the ejection of compact temporary storage case (4) between intercommunication install discharging channel (5), and ejection of compact cooling section (104) and ejection of compact temporary storage case (4) inner chamber upper portion intercommunication install the second air and advance pipe (27), ejection of compact temporary storage case (4) inner chamber upper portion one side intercommunication is installed first air and is advanced pipe (11), and first air advances pipe (11) and is located heat exchange case (6) inner chamber part intercommunication and be connected with spiral heat exchange tube (8).

2. The active lime kiln capable of being monitored in real time according to claim 1, wherein a smoke exhaust chimney (18) is communicated and installed on one side of the desulfurization tower (17), a rain cover (19) is fixedly installed at the top end of the smoke exhaust chimney (18), and a sulfur dioxide detector (20) is installed on the inner side of the rain cover (19).

3. The active lime kiln capable of being monitored in real time according to claim 1, wherein the second smoke exhaust connecting pipe (10) is provided with an economizer (12) and a smoke exhaust fan (13) respectively.

4. The active lime kiln capable of being monitored in real time according to claim 1, wherein a first thermocouple (22) fixedly installed on the side wall of the kiln body (1) is arranged at one side of the calcination section (102), and a second thermocouple (23) fixedly installed on the side wall of the kiln body (1) is arranged at one side of the heat preservation section (103).

5. The active lime kiln capable of being monitored in real time according to claim 1, wherein a first temperature sensor (21) fixedly installed at the top of the inner cavity of the kiln body (1) is arranged at the top of the feeding preheating section (101), and a second temperature sensor (14) is installed at one end of the inner cavity of the second smoke exhaust connecting pipe (10).