CN219301329U

CN219301329U - Flue gas sensible heat and latent heat recovery device

Info

Publication number: CN219301329U
Application number: CN202222029108.6U
Authority: CN
Inventors: 蒋受宝
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-08-03
Filing date: 2022-08-03
Publication date: 2023-07-04
Anticipated expiration: 2032-08-03

Abstract

The utility model relates to a flue gas sensible heat and latent heat recovery device, which comprises a tower body, wherein a flue gas inlet pipe communicated with an inner cavity of the tower body is arranged on the side wall of the tower body; the tower body is internally provided with a filling section, a spraying section and a demisting section which are sequentially distributed from bottom to top, the top of the tower body is provided with a chimney communicated with the top of the demisting section, and the filling section is positioned above the flue gas inlet pipe. The flue gas sensible heat and latent heat recovery device has good purification effect on flue gas, so that the discharged flue gas basically does not contain particulate matters, and the conditions of heat exchanger blockage and low-temperature corrosion of a penetrating pipe are avoided; meanwhile, the water vapor contained in the flue gas can be condensed and recovered, and a large amount of water resources can be recovered, so that sensible heat and latent heat of the flue gas can be recovered, and the process medium fluid in the production process can be heated or used for heating.

Description

Flue gas sensible heat and latent heat recovery device

Technical Field

The utility model relates to a flue gas sensible heat and latent heat recovery device, in particular to a high-moisture low-temperature flue gas sensible heat and latent heat recovery device, and belongs to the technical field of industrial furnace flue gas waste heat recovery.

Background

The roasting process is the last procedure of alumina production, and the main task of the production process is to calcine the aluminum hydroxide with the adhering water and the crystallization water in a roasting furnace at high temperature, and remove the adhering water and the crystallization water, thereby generating an alumina product with satisfactory physicochemical properties. The roasting production process is an important link for determining the yield, quality and energy consumption of the alumina, the energy consumption accounts for about 10% of the energy consumption of the alumina production, and the exhaust temperature of the outlet of the roasting furnace is about 150 ℃. Not only is the alumina roasting furnace, but also other kiln, such as clinker roasting kiln, material drying kiln, natural gas boiler, etc., the fuel of these industrial kiln contains hydrogen and the material contains physical water and crystal water, etc., SO that the discharged flue gas has higher proportion of water vapor, and the water vapor is emptied to take away a large amount of latent heat of vaporization, and at the same time the flue gas contains dust and SO ₃ And the like, and has serious environmental pollution.

At present, the discharged smoke of the outlets of industrial kilns such as roasting furnaces, clinker roasting kilns, material drying kilns, natural gas boilers and the like of domestic alumina factories is discharged directly or is discharged after being cooled by a smoke indirect heat exchanger, and the conditions of energy waste, dust contained in discharged smoke, easy blockage of the heat exchanger and low-temperature corrosion of a penetrating pipe exist.

Disclosure of Invention

The utility model aims to provide a flue gas sensible heat and latent heat recovery device with good purification effect aiming at the defects of the prior art.

The technical scheme adopted by the utility model is as follows:

the flue gas sensible heat and latent heat recovery device comprises a tower body, wherein a flue gas inlet pipe communicated with an inner cavity of the tower body is arranged on the side wall of the tower body; the tower body is internally provided with a filling section, a spraying section and a demisting section which are sequentially distributed from bottom to top, the top of the tower body is provided with a chimney communicated with the top of the demisting section, and the filling section is positioned above the flue gas inlet pipe.

Further, the filler section comprises a number of filler units.

Further, the number of the packing units is more than or equal to 3, and the packing units are distributed in sequence from bottom to top.

Further, the packing unit comprises a first bracket arranged on the inner wall of the tower body, a gas distribution plate arranged on the first bracket and a packing layer arranged on the gas distribution plate.

Further, the spraying section comprises at least 2 first spraying mechanisms which are distributed in sequence from bottom to top, and the first spraying mechanisms comprise a plurality of nozzles, and optionally, the number of the nozzles is 12-36.

Further, a water outlet pipe is arranged on the side wall of the tower body, the water outlet pipe is positioned below the flue gas inlet pipe, an indirect heat exchanger is communicated with the water outlet pipe, the indirect heat exchanger is provided with a first medium inlet and a first medium outlet, the water outlet pipe is communicated with the first medium inlet, a pump (8) is arranged between the water outlet pipe (1.8) and the first medium inlet, and the first medium outlet is communicated with the first spraying mechanism.

Further, the spray direction of the spray nozzle is upward.

Further, the demisting section comprises a baffle demister, a second spraying mechanism is arranged above and/or below the baffle demister, and the spraying direction of the second spraying mechanism faces the baffle demister.

Further, a second bracket is arranged on the inner wall of the tower body, and the baffle plate demister is arranged on the second bracket.

Further, still include the third support that is fixed in tower body top, the third support includes the support body, the chimney upwards passes the support body, be equipped with at least 2 groups from bottom to top in proper order the crossbeam that distributes on the support body, be fixed with the journal stirrup on the lateral wall of chimney, the journal stirrup is placed on the crossbeam. Therefore, the third bracket not only can support the weight of the chimney, but also can be used as a guide bracket of the chimney, so that the chimney can vertically upwards when being heated and expanded.

Further, the inner cavity of the tower body is cylindrical, the flue gas inlet pipe is communicated with the inner cavity along the tangential direction of the inner cavity, and a flue gas flow equalizer is arranged in the flue gas inlet pipe. In this way, the flue gas entering the tower body is divided into at least 2 air flows, and the air flows upwards in a spiral manner.

Optionally, an anti-corrosion paint layer is arranged on the inner wall of the tower body.

The flue gas purifier can effectively reduce the dust content in the flue gas, condense and recycle water vapor in the flue gas, reduce the temperature of discharged flue gas and recycle sensible heat and latent heat of the flue gas; the original indirect flue gas heat exchanger is changed into the flue gas to directly exchange heat with the spray liquid, so that the conditions of heat exchanger blockage and low-temperature corrosion of the penetrating pipe do not exist.

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

1. by matching the mechanisms of the filling section, the spraying section, the demisting section and the like, the flue gas and the spraying liquid are in direct contact and exchange heat, so that the flue gas has a good purifying effect, the discharged flue gas basically does not contain particles, and the conditions of heat exchanger blockage and low-temperature corrosion of a penetrating pipe are avoided; meanwhile, the water vapor contained in the flue gas can be condensed and recovered, and a large amount of water resources can be recovered, so that sensible heat and latent heat of the flue gas can be recovered, and the process medium fluid in the production process can be heated or used for heating.

2. The flue gas purifier has the advantages of simple operation, automatic control and extremely simple maintenance.

In conclusion, the flue gas can be effectively purified, part of condensed water and sensible heat latent heat in the flue gas can be recovered, the national related environmental protection policy is met, the production cost of enterprises is reduced, and the economic benefit of the enterprises is improved.

Drawings

Fig. 1 is a schematic diagram of the structure of the flue gas cleaner of the present utility model.

Fig. 2 is a cross-sectional view taken along line A-A of fig. 1.

Fig. 3 is a top view of a third bracket of the present utility model.

Detailed Description

The utility model will be described in detail below with reference to the drawings in connection with embodiments. It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. For convenience of description, the words "upper", "lower", "left" and "right" are used hereinafter to denote only the directions corresponding to the upper, lower, left, and right directions of the drawings, and do not limit the structure.

Example 1

Referring to fig. 1 to 3, a flue gas sensible heat and latent heat recovery device comprises a tower body 1, wherein a flue gas inlet pipe 1.3 communicated with an inner cavity of the tower body is arranged on a side wall 1.2 of the tower body 1, a packing section 3, a spraying section 4 and a demisting section 5 which are sequentially distributed from bottom to top are arranged in the tower body 1, a chimney 1.5 communicated with the top of the demisting section 5 is arranged at the top of the tower body 1, and the packing section 3 is positioned above the flue gas inlet pipe 1.3. The chimney 1.5 is communicated with the tower body through a transition section 1.4. Optionally, a flue gas mixing pipeline 6 is arranged on the transition section 1.4, and high-temperature flue gas can be mixed according to the situation, so that the temperature of the discharged flue gas is higher than the dew point temperature, and white flue gas is not formed at the outlet of the chimney.

The packing section 3 comprises 3 packing units, and each packing unit is distributed from bottom to top in sequence. The packing unit comprises a first bracket 3.1 arranged on the inner wall of the tower body 1, a gas distribution plate 3.2 arranged on the first bracket 3.1 and a packing layer 3.3 arranged on the gas distribution plate 3.2. And a wall flow preventing device 3.4 is arranged above each packing layer 3.3. Optionally, the first bracket 3.1 is formed by I-steel arranged in a cross shape, and the I-steel is welded on the inner wall of the tower body. The filler is a light porcelain filler. The light porcelain filler has high-temperature blowing resistance, small specific gravity and corrosion resistance, and can greatly increase the contact area of flue gas and atomized spray liquid, and has good heat and mass transfer effect. The wall flow preventing device is arranged above the packing layer, so that the spray liquid can be prevented from flowing downwards along the side wall, and the spray liquid can completely flow through the packing layer. Optionally, the gas distribution plate 3.2 is formed by vertically installing stainless steel flat steel, the distance between adjacent stainless steel flat steel is 35mm, and the gas distribution plate is fixed on the first bracket 3.1, supports the filler layer and has the function of uniformly distributing flue gas.

The spraying section 4 comprises 2 first spraying mechanisms which are distributed from bottom to top in sequence, and the first spraying mechanisms comprise 24 nozzles. The spray direction of the spray nozzle is upward. Optionally, the nozzles are conical spiral nozzles, and the nozzles are uniformly distributed in the tower body along the circumference.

The demisting section 5 comprises a baffle demister 5.2, a second spraying mechanism 5.3 is respectively arranged above and below the baffle demister 5.2, and the spraying direction of the second spraying mechanism faces the baffle demister 5.2. The inner wall of the tower body 1 is provided with a second bracket 5.1, and the baffle plate demister 5.2 is arranged on the second bracket 5.1, and optionally, the second bracket is composed of channel steel which is arranged in a groined manner. Optionally, the baffle defroster adopts the baffle defroster of PP material, light in weight to effectively get rid of the liquid drop in the flue gas. The second spraying mechanisms are respectively arranged below and above the baffle plate demisters, so that the baffle plate demisters can be periodically opened and cleaned, and blockage of the baffle plate demisters is prevented.

The novel chimney is characterized by further comprising a third bracket 1.6 fixed at the top of the tower body 1, the third bracket 1.6 comprises a bracket body 1.61, the chimney 1.5 upwards penetrates through the bracket body 1.61, at least 2 groups of beams 1.62 which are distributed in sequence from bottom to top are arranged on the bracket body 1.61, lugs 1.51 are fixed on the outer side wall of the chimney 1.5, and the lugs 1.51 are placed on the beams 1.62.

The inner cavity of the tower body is cylindrical, the flue gas inlet pipe 1.3 is communicated with the inner cavity along the tangential direction of the inner cavity, the flue gas flow equalizer 2 is arranged in the flue gas inlet pipe 1.3, and the flue gas flow equalizer 2 comprises a vertically arranged flue gas flow equalizing plate, so that the flue gas entering the tower body forms a double-spiral flow field in the tower body to flow upwards.

The side wall of the tower body is communicated with an overflow water seal pipe 1.7, a water outlet pipe 1.8 and a manhole 1.9, the position of the overflow water seal pipe is lower than that of the flue gas inlet pipe, the water outlet pipe 1.8 is positioned below the overflow water seal pipe 1.7, the manhole 1.9 is positioned below the water outlet pipe 1.8, and the manhole is close to the bottom plate 1.1 of the tower body, so that the lower part of the water outlet pipe can be regarded as a sedimentation zone, and a clean zone is formed between the water outlet pipe and the overflow water seal pipe. Optionally, the water outlet pipe 1.8 is communicated with an indirect heat exchanger 7, the indirect heat exchanger 7 is provided with a first medium inlet and a first medium outlet, the water outlet pipe 1.8 is communicated with the first medium inlet, a pump 8 is communicated between the outlet pipe 1.8 and the indirect heat exchanger 7, and the first medium outlet is communicated with the first spraying mechanism, so that heat energy carried by spraying liquid can be recycled, and the spraying liquid is cooled and then is repeatedly used for spraying. The arrangement of the manhole can facilitate the periodic cleaning of the sludge at the bottom of the tower body; the overflow water seal pipe 1.7 can be used as an overflow pipe when the liquid level in the tower body exceeds the highest liquid level, or can be used as a water seal pipe when the liquid level in the tower body is lower than the highest liquid level, so that the flue gas is prevented from being discharged through the pipeline.

The foregoing examples are set forth in order to provide a more thorough description of the present utility model, and are not intended to limit the scope of the utility model, since modifications of the utility model in various equivalent forms will occur to those skilled in the art upon reading the present utility model, and are within the scope of the utility model as defined in the appended claims.

Claims

1. The flue gas sensible heat and latent heat recovery device comprises a tower body (1), wherein a flue gas inlet pipe (1.3) communicated with an inner cavity of the tower body is arranged on the side wall of the tower body (1); the tower is characterized in that a filling section (3), a spraying section (4) and a demisting section (5) which are sequentially distributed from bottom to top are arranged in the tower body (1), a chimney (1.5) communicated with the top of the demisting section (5) is arranged at the top of the tower body (1), and the filling section (3) is located above the flue gas inlet pipe (1.3).

2. The flue gas sensible heat and latent heat recovery device according to claim 1, wherein the packing section (3) comprises a plurality of packing units, the number of the packing units is more than or equal to 3, and each packing unit is distributed from bottom to top in sequence.

3. The flue gas sensible heat and latent heat recovery device according to claim 2, wherein the packing unit comprises a first bracket (3.1) arranged on the inner wall of the tower body (1), a gas distribution plate (3.2) arranged on the first bracket (3.1), and a packing layer (3.3) arranged on the gas distribution plate (3.2).

4. The flue gas sensible heat and latent heat recovery device according to claim 1, wherein the spray section (4) comprises at least 2 first spray mechanisms distributed in sequence from bottom to top, the first spray mechanisms comprising a plurality of nozzles.

5. The flue gas sensible heat and latent heat recovery device according to claim 4, wherein a water outlet pipe (1.8) is arranged on the side wall of the tower body (1), the water outlet pipe (1.8) is positioned below the flue gas inlet pipe (1.3), an indirect heat exchanger (7) is communicated with the water outlet pipe (1.8), the indirect heat exchanger (7) is provided with a first medium inlet and a first medium outlet, the water outlet pipe (1.8) is communicated with the first medium inlet, a pump (8) is arranged between the water outlet pipe (1.8) and the first medium inlet, and the first medium outlet is communicated with the first spraying mechanism.

6. The flue gas sensible heat and latent heat recovery device according to claim 4, wherein the injection direction of the nozzle is upward.

7. The flue gas sensible heat and latent heat recovery device according to claim 1, characterized in that the demisting section (5) comprises a baffle demister (5.2), a second spraying mechanism is arranged above and/or below the baffle demister (5.2), and the spraying direction of the second spraying mechanism faces the baffle demister (5.2).

8. The flue gas sensible heat and latent heat recovery device according to claim 7, wherein a second bracket (5.1) is arranged on the inner wall of the tower body (1), and the baffle demister (5.2) is arranged on the second bracket (5.1).

9. The flue gas sensible heat and latent heat recovery device according to any one of claims 1-8, further comprising a third bracket (1.6) fixed at the top of the tower body (1), wherein the third bracket (1.6) comprises a frame body (1.61), the chimney (1.5) passes through the frame body (1.61) upwards, at least 2 groups of beams (1.62) distributed in sequence from bottom to top are arranged on the frame body (1.61), lugs (1.51) are fixed on the outer side wall of the chimney (1.5), and the lugs (1.51) are placed on the beams (1.62).

10. The flue gas sensible heat and latent heat recovery device according to any one of claims 1-8, wherein the inner cavity of the tower body is cylindrical, the flue gas inlet pipe (1.3) is communicated with the inner cavity along the tangential direction of the inner cavity, and a flue gas flow equalizer (2) is arranged in the flue gas inlet pipe (1.3).