CN211739958U

CN211739958U - Smoke low-temperature air exchanger of cremator

Info

Publication number: CN211739958U
Application number: CN202020223564.2U
Authority: CN
Inventors: 陆妍娜; 闵锦兴
Original assignee: Shanghai Xinrun Environmental Protection Equipment Co ltd
Current assignee: Shanghai Xinrun Environmental Protection Equipment Co ltd
Priority date: 2020-02-28
Filing date: 2020-02-28
Publication date: 2020-10-23
Anticipated expiration: 2030-02-28

Abstract

The utility model relates to a cremator flue gas low temperature air heat exchanger. Mainly solves the technical problems of secondary pollution, complicated and complicated equipment and high investment of the existing water-cooling spraying. The technical scheme of the utility model is that: the utility model provides a cremator flue gas low temperature air exchanger, includes the tube-shape casing, and tube-shape casing lateral wall upper portion is equipped with high temperature flue gas inlet, and tube-shape casing lateral wall lower part is equipped with the low temperature exhanst gas outlet, and the tube-shape casing lower extreme is equipped with normal atmospheric temperature air inlet, and normal atmospheric temperature gas inlet UNICOM casing internal perpendicular air pipe is equipped with the tube-shape spacer outside the tube-shape casing, and the tube-shape casing upper end is equipped.

Description

Smoke low-temperature air exchanger of cremator

Technical Field

The utility model relates to a cremator air exchanger, in particular to cremator flue gas low temperature air exchanger.

Background

After the high-temperature flue gas of 900-950 ℃ generated by the cremator is subjected to heat exchange by the high-temperature air preheater, preheated air is supplied to the first cremator, and the secondary hearth is used as combustion-supporting air, so that the temperature of the hearth of the cremator is increased, the cremation reaction time is shortened relatively quickly, the fuel consumption is reduced, the flue gas emission is reduced, and the energy conservation and emission reduction are realized.

And at this moment, the temperature of the flue gas discharged from the high-temperature preheater still reaches 650 ℃, the temperature of the flue gas must be continuously reduced to 200-180 ℃ before the flue gas enters the bag-type dust remover, in addition, the flue gas is cooled from 550 ℃ to 200-180 ℃ at the highest speed according to the requirements of the environment-friendly flue gas purification process, the cooling time is 1 second, the dioxin regeneration is inhibited, a wet method of a spray mist quench tower is used before the cooling, the effect is good, but the problems exist, 1 needs water, 2 secondary pollution and the like, in order to overcome the defects of the wet method, a low-temperature air heat exchanger (dry cooling) is provided, air and the flue gas are subjected to heat exchange, then preheated air are discharged into a chimney, the cooled flue gas enters the bag-type dust.

In the past, for the purpose of environmental protection process requirements, water-cooling spraying is adopted to directly contact with flue gas, the flue gas is cooled to 200-180 ℃ at an extremely high speed, the cooling time is 1 second, water is a good coolant, the gasification specific heat of the water is large, the design of a spray water mist quenching tower is not problematic, the process requirements are easily met, and the water-cooling spraying quenching tower has the advantages of water cooling, but the water-cooling spraying quenching tower has other defects except the advantages, such as: the water vapor increases the amount of off-gas. Often causes secondary pollution, mortar water influences environmental sanitation, and secondary environmental treatment is needed. The equipment and the accessory equipment thereof have large volume, large occupied area and various accessory equipment (a water tank, a pump, an air compressor, an air storage tank, a water and air supply pipeline, particularly an expensive inlet spray gun is more serious and is hindered by water problems, the equipment can not be used in water-deficient areas, the equipment can not be used in northern winter, and the like.

Disclosure of Invention

The utility model aims at providing a cremator flue gas low temperature air exchanger. Mainly solves the technical problems of secondary pollution, complicated and complicated equipment and high investment of the existing water-cooling spraying.

The utility model discloses the creative degree of difficulty mainly reflects in: the low-temperature air heat exchanger mainly has the functions that normal-temperature air is used for cooling flue gas through the low-temperature heat exchanger, the flue gas is rapidly cooled to 200-180 ℃ from 650 ℃, particularly the flue gas is cooled to 200-180 ℃ at 550 ℃, the flue gas is rapidly cooled, the cooling time is 1 second, the dioxin regeneration is inhibited, the technical difficulty is brought to the design due to the requirement of the flue gas dedusting environment-friendly process, and the design of the low-temperature air heat exchanger is a key point.

Design low temperature air heat exchanger replaces the spray cooling tower, and the purpose is clear but the design degree of difficulty is very big, and 650 ℃ flue gas exchanges heat with the air, if use radiation as main consideration, the flue gas temperature is too low in the design, obtains the thermal coefficient from the numerical value of calculation very little, is less than the convection current and gives the thermal coefficient, and the low temperature radiation flue gas temperature that indicates at ordinary times is also more than 800~850 ℃. In conclusion, the radiant preheater is not adequate and should be dominated by a convection heat exchanger. In the design, when the temperature of the flue gas is reduced to 200-180 ℃, rapid cooling is required, the cooling time is ensured to be 1 second, the dioxin regeneration is inhibited, and the key point of the low-temperature heat exchanger is also considered.

The technical scheme of the utility model is that: the utility model provides a cremator flue gas low temperature air exchanger, includes the tube-shape casing, and tube-shape casing lateral wall upper portion is equipped with high temperature flue gas inlet, and tube-shape casing lateral wall lower part is equipped with the low temperature exhanst gas outlet, and the tube-shape casing lower extreme is equipped with normal atmospheric temperature air inlet, and normal atmospheric temperature gas inlet UNICOM casing internal perpendicular air pipe is equipped with the tube-shape spacer outside the tube-shape casing, and the tube-shape casing upper end is equipped.

The distance between the cylindrical spacer bush and the cylindrical shell is 30 mm. The cylindrical spacer sleeve is provided with heat dissipation fins at intervals.

The high-pressure large-air-volume blower blows air at room temperature, and carries out reverse cross flow with the flue gas at the speed of 15Nm/s, and the heat is transferred in a convection way. And reducing the temperature of the flue gas to 200-180 ℃, and enabling the flue gas to enter a bag-type dust collector from a low-temperature flue gas outlet. The high-pressure high-air-volume blower is used for generating hot air to be discharged outside through heating and heat exchange and used as jet drainage to drive the static air in the spacer bush to flow at the speed of 6Nm/s, and the static air and the shell generate convection heat transfer and conduction heat transfer to reduce the wall temperature of the shell. After heat exchange, natural air and air of the blower are mixed and then discharged together, and the temperature of the discharged air is lower than the temperature required by the flue gas entering the cloth bag.

The utility model has the advantages that: compared with wet dedusting, the flue gas contains water vapor, the flue gas treatment amount is large, and simultaneously, water dust sludge is generated and needs secondary treatment. The utility model discloses dry process dust removal flue gas is few, and through the setting of various gas imports and exports, adopt and normal atmospheric temperature air counter-current add the cross-flow mode, low temperature air heat exchanger is used at three storehouse cremation machines aftertreatment, and the behavior is normal, has reached former designing requirement, guarantees that gas cleaning normally uses, and final 650 ℃ flue gas temperature falls to 200~180 ℃, gets into the sack cleaner, can not burn out the sack cleaner, prolongs sack cleaner life.

Drawings

Fig. 1 is a schematic view of the external structure of the present invention.

Fig. 2 is a schematic view of the internal structure of the present invention.

In the figure: 1-cylindrical shell, 2-high temperature flue gas inlet, 3-low temperature flue gas outlet, 4-normal temperature air inlet, 5-hot air outlet, 6-vertical air pipe, 7-cylindrical spacer bush and 8-radiating rib sheet.

Detailed Description

Referring to fig. 1 and 2, the low-temperature flue gas air exchanger for the cremator comprises a cylindrical shell 1, wherein a high-temperature flue gas inlet 2 is arranged on the upper portion of the side wall of the cylindrical shell, a low-temperature flue gas outlet 3 is arranged on the lower portion of the side wall of the cylindrical shell, a normal-temperature air inlet 4 is arranged at the lower end of the cylindrical shell, the normal-temperature air inlet 4 is communicated with a vertical air pipe 6 in the shell, a cylindrical spacer 7 is arranged outside the cylindrical shell, and a hot air outlet 5. The distance between the cylindrical spacer 7 and the cylindrical shell 1 is 30 mm. The cylindrical spacer 7 is provided with heat dissipation fins 8 at intervals.

The utility model discloses normal atmospheric temperature air is at the internal flow of perpendicular air pipe 6 during the use, the flue gas is at 1 internal flow of tube-shape casing, tube-shape casing steel sheet receives flue gas conduction heat, flue gas convection heat transfer, tube-shape casing outer wall temperature on average reaches about 110 ℃, be higher than the surface temperature allowed, tube-shape casing will take safety measure, otherwise can scald the personnel, if tube-shape casing wraps the heat preservation, influence the outer wall and dispel the heat to the outside, outer wall temperature lasts and improves, for making flue gas temperature 550 ℃ fall to 200~180 ℃ in 1 second, utilize low temperature air heat exchanger exhaust hot air "20 Nm/S velocity of flow and big pressure head, flue gas velocity of flow" 3Nm/S, carry out the heat exchange, through conduction heat transfer, convection heat transfer, solve urceolus outer wall surface temperature rise problem, former natural heat dissipation becomes forced heat.

The utility model discloses compare with water-cooling spray cooling tower

Serial number	Name (R)	Low-temperature air heat exchanger	Spray cooling tower
				1	Overall dimension	Phi 710mmx height 5000mm	Phi 1500mmx height 9000mm
2	Accessory device	One fan	5M³Water tank, water pump, air compressor, spray gun, electric control cabinet, etc
				3	Electric power	7.5KW	13KW
4	Environment(s)	Noise coincidence labeling	Noise exceeding standard
				5	Secondary pollution	Dry method, no pollution	Wet, aqueous slurry contamination
6	Applicability of the invention	Workshop is not affected	High and large workshop, ensuring water supply
				7	Maintenance and repair	Simple and convenient, low failure rate	Tedious, regularly cleaning up mortar, clogged nozzles, etc
8	Operating costs	Is less	Larger, replacement fittings, etc
				9	Total cost of manufacture	Is low in	Is higher than

The conclusion is that the water-cooling spray cooling tower has the advantages that the cooling effect is good, the cooling time is reached, and other indexes are much shorter than those of a low-temperature air heat exchanger.

The low-temperature air exchanger is convenient to use and debug, simple and convenient to maintain and low in failure rate from the technical structure, manufacture, transportation and field installation. The low-temperature air heat exchanger is made of carbon steel, so that the total manufacturing cost is low, and the cost is reduced and the benefit is increased for enterprises. The utility model discloses give the thermal coefficient height, do not increase the gas volumn, relative overall dimension is little, and the outward appearance is pleasing to the eye, can apply to the cremator, also has the popularization and application prospect on the domestic waste stove, can replace water-cooling spray cooling tower completely, becomes the essential green key equipment of close ring of gas cleaning dust removal aftertreatment.

Claims

1. The utility model provides a cremator flue gas low temperature air exchanger, includes the tube-shape casing, characterized by: the upper part of the side wall of the cylindrical shell is provided with a high-temperature flue gas inlet, the lower part of the side wall of the cylindrical shell is provided with a low-temperature flue gas outlet, the lower end of the cylindrical shell is provided with a normal-temperature air inlet, the normal-temperature air inlet is communicated with a vertical air pipe in the shell, a cylindrical spacer sleeve is arranged outside the cylindrical shell, and the upper end of the cylindrical shell is provided with a hot.

2. A cremator flue gas low temperature air exchanger as claimed in claim 1, wherein: the distance between the cylindrical spacer bush and the cylindrical shell is 30 mm.

3. A cremator flue gas low temperature air exchanger as claimed in claim 1, wherein: the cylindrical spacer sleeve is provided with heat dissipation fins at intervals.