CN219607153U - Domestic garbage incineration air preheater - Google Patents
Domestic garbage incineration air preheater Download PDFInfo
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- CN219607153U CN219607153U CN202320595554.5U CN202320595554U CN219607153U CN 219607153 U CN219607153 U CN 219607153U CN 202320595554 U CN202320595554 U CN 202320595554U CN 219607153 U CN219607153 U CN 219607153U
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- air
- flue gas
- heat exchanger
- steam
- air heat
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The utility model relates to a household garbage incineration air preheater, and belongs to the field of household garbage incineration. Comprises steam-air heat exchangers and flue gas-air heat exchangers which are arranged in parallel; the steam-air heat exchanger takes steam as a working medium and is provided with a steam inlet and a drain outlet, and air exchanges heat with the steam outside the steam-air heat exchanger; air subjected to heat exchange by the steam-air heat exchanger is communicated with the flue gas-air heat exchanger; the flue gas-air heat exchanger takes air as a working medium and is provided with an air inlet and an air outlet, and the flue gas exchanges heat with the air outside the flue gas-air heat exchanger. The utility model can effectively solve the problem of low-temperature corrosion of the domestic garbage incineration flue gas air preheater and the problem of insufficient heating temperature of the low-steam parameter air preheater.
Description
Technical Field
The utility model belongs to the field of household garbage incineration, and relates to a household garbage incineration air preheater.
Background
In the household garbage incineration project, because the heat value of garbage is not high, the combustion air of garbage incineration is usually required to be heated in order to ensure stable combustion of garbage, and the temperature of primary air is usually required to be heated to be higher than 220 ℃.
Since sulfur oxides are generally produced during incineration of household garbage, sulfuric acid vapor is formed after the sulfur oxides are combined with water vapor. When the temperature of the metal wall surface of the heating surface at the tail part of the boiler is lower than the condensation point (called acid dew point) of sulfuric acid steam, liquid sulfuric acid (called dew) is formed on the surface of the metal wall surface. Corrosion of the heating surface due to dew condensation often occurs for a long time, and is difficult to avoid. Therefore, in the household garbage incineration project, a flue gas-air preheater is not generally adopted to heat the air, and the cold air enters a preheater pipeline to cause acid steam in the hot flue gas to be quickly condensed in a low-temperature air pipeline area so as to form low-temperature corrosion. Even if a material with very high corrosion resistance is adopted, the service life is relatively short, and the cost is very high. The household garbage incineration project can only adopt a steam-air preheater for air heating, and the steam needs a higher temperature to reach the requirement of air heating.
At present, the steam temperature of some small-sized household garbage incineration projects is lower than 220 ℃ because the steam parameters adopted by the boiler are lower, and the garbage incineration combustion-supporting air cannot be heated to be more than 220 ℃.
Disclosure of Invention
In view of the above, the utility model aims to provide the household garbage incineration air preheater, which can effectively solve the problems of low-temperature corrosion of the flue gas air preheater and insufficient heating temperature of the low-steam parameter air preheater.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
a domestic garbage incineration air preheater comprises a steam-air heat exchanger and a flue gas-air heat exchanger which are arranged in parallel; the steam-air heat exchanger takes steam as a working medium and is provided with a steam inlet and a drain outlet, and air exchanges heat with the steam outside the steam-air heat exchanger; air subjected to heat exchange by the steam-air heat exchanger is communicated with the flue gas-air heat exchanger; the flue gas-air heat exchanger takes air as a working medium and is provided with an air inlet and an air outlet, and the flue gas exchanges heat with the air outside the flue gas-air heat exchanger.
Optionally, the air pre-conditioner comprises an air pre-conditioner shell, wherein the air inlet and the air outlet are arranged on the air pre-conditioner shell.
Optionally, a partition plate is arranged in the air preheater shell, the space in the air preheater shell is divided into two independent air chambers through the partition plate, one air chamber is used as the hot air inlet of the flue gas-air heat exchanger, and the other air chamber is used as the hot air outlet of the flue gas-air heat exchanger.
Optionally, the section of the partition plate is L-shaped and consists of two side arms with a certain included angle.
Optionally, the two side arms of the partition board form an obtuse angle.
Optionally, the arrangement direction of the steam-air heat exchanger is perpendicular to the arrangement direction of the flue gas-air heat exchanger.
Optionally, the flue gas-air heat exchanger is arranged below the steam-air heat exchanger.
Optionally, the flue gas-air heat exchanger is disposed in the flue gas channel.
Optionally, a flue gas inlet and a flue gas outlet are arranged on the flue gas channel.
Optionally, the steam-air heat exchanger pipeline is made of carbon steel; the flue gas-air heat exchanger pipeline is made of carbon steel or ND steel.
The utility model has the beneficial effects that:
the utility model can effectively solve the problems of low-temperature corrosion of the flue gas air preheater and insufficient heating temperature of the low-steam parameter air preheater by arranging the steam-air heat exchanger and the flue gas-air heat exchanger.
Specifically, the steam-air heat exchanger is used for heat exchange between steam and air, the steam can be saturated steam with the temperature of more than 160 ℃, the drainage temperature is less than or equal to 80 ℃, and the steam flows in the heat exchanger tube; the temperature of the air inlet is normal temperature, the temperature of the air outlet is about 120 ℃, the temperature of the air outlet is adjustable (the temperature of the wall of a pipeline of the flue gas-air heat exchanger is guaranteed to be higher than the temperature of an acid dew point, the temperature of the acid dew point is about 120-130 ℃ according to empirical data), the flue gas-air heat exchanger is used for heat exchange between flue gas and air, the heat exchanger is arranged in a flue gas channel of a boiler, the shell of the air preheater can be used as the outer wall of the flue gas channel, and the inlet flue gas can be boiler flue gas with the temperature of about 400 ℃. The temperature of the air inlet is about 120 ℃, the temperature of the outlet is more than or equal to 220 ℃ (determined according to the garbage combustion requirement). The wall temperature of the heat exchange pipeline can be effectively ensured to be higher than 140 ℃ when the temperature of the air inlet is about 120 ℃, the acid dew point temperature range is effectively avoided, and the low-temperature corrosion of the pipeline is avoided.
Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model. The objects and other advantages of the utility model may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the present utility model will be described in the following preferred detail with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural view of the present utility model.
Reference numerals: an air inlet 1, a drain outlet 2, a steam inlet 3, an air outlet 4, a flue gas channel 5, a flue gas outlet 6, a shell 7, a steam-air heat exchanger 8, a flue gas-air heat exchanger 9, a baffle plate 10 and a flue gas inlet 11.
Detailed Description
Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present utility model with reference to specific examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present utility model by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.
Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to limit the utility model; for the purpose of better illustrating embodiments of the utility model, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numbers in the drawings of embodiments of the utility model correspond to the same or similar components; in the description of the present utility model, it should be understood that, if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc., that indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, it is only for convenience of describing the present utility model and simplifying the description, but not for indicating or suggesting that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and should not be construed as limiting the present utility model, and that the specific meaning of the above terms may be understood by those of ordinary skill in the art according to the specific circumstances.
Referring to fig. 1, a domestic garbage incineration air preheater comprises a steam-air heat exchanger 8 and a flue gas-air heat exchanger 9 which are arranged in parallel; the steam-air heat exchanger 8 takes steam as a working medium, is provided with a steam inlet 3 and a drain outlet 2, and exchanges heat with the steam outside the steam-air heat exchanger; the air after heat exchange by the steam-air heat exchanger 8 is communicated with the flue gas-air heat exchanger 9; the flue gas-air heat exchanger 9 takes air as a working medium and is provided with an air inlet 1 and an air outlet 4, and the flue gas exchanges heat with the air outside the flue gas-air heat exchanger.
The air inlet 1 and the air outlet 4 are arranged on the air preheater shell 7; the air preheater shell 7 is used for fixing and placing the steam-air heat exchanger 8, the air duct, the partition board 10 and the flue gas-air heat exchanger 9. A partition board 10 is arranged in the air preheater shell 7, the space in the air preheater shell 7 is divided into two independent air chambers through the partition board 10, one air chamber is used as the inlet of hot air of the flue gas-air heat exchanger 9, and the other air chamber is used as the outlet of hot air of the flue gas-air heat exchanger 9; the section of the partition board 10 is L-shaped and consists of two side arms with a certain included angle; an obtuse angle is formed between the two side arms of the partition board 10; the arrangement direction of the steam-air heat exchanger 8 is perpendicular to the arrangement direction of the flue gas-air heat exchanger 9; the flue gas-air heat exchanger 9 is arranged below the steam-air heat exchanger 8; the flue gas-air heat exchanger 9 is arranged in the flue gas channel 5; the flue gas channel 5 is provided with a flue gas inlet 11 and a flue gas outlet 6.
The steam-air heat exchanger 8 is used for exchanging heat between steam and air, the steam can be saturated steam with the temperature of more than 160 ℃, the drainage temperature is less than or equal to 80 ℃, and the steam flows in a heat exchanger tube; the temperature of the air inlet 1 is normal temperature, the temperature of the outlet is about 120 ℃, the temperature of the air outlet 4 is adjustable (the temperature of the pipeline wall of the flue gas-air heat exchanger 9 is guaranteed to be higher than the acid dew point temperature which is about 120-130 ℃ according to empirical data), then the flue gas-air heat exchanger 9 is continuously heated, and the air flows outside the heat exchanger. The steam-air heat exchanger 8 pipeline is made of carbon steel, and the heating area and the pipeline specification are calculated and determined according to specific projects and parameters.
The partition board 10 divides the middle air channel into two parts to form two independent air chambers, one air chamber is used as the hot air inlet of the flue gas-air heat exchanger 9, and the other air chamber is used as the hot air outlet of the flue gas-air heat exchanger 9. Carbon steel is adopted as the material.
The flue gas-air heat exchanger 9 is used for heat exchange between flue gas and air, the flue gas-air heat exchanger 9 is arranged in the flue gas channel 5 of the boiler, the air preheater shell 7 can be used as the outer wall of the flue gas channel 5, and the inlet flue gas can be the flue gas of the boiler at about 400 ℃. The temperature of the air inlet 1 is about 120 ℃, the outlet temperature is more than or equal to 220 ℃ (determined according to the garbage combustion requirement). The wall temperature of the heat exchange pipeline can be effectively ensured to be higher than 140 ℃ when the temperature of the air inlet 1 is about 120 ℃, the acid dew point temperature range is effectively avoided, and the low-temperature corrosion of the pipeline is avoided. The flue gas-air heat exchanger 9 pipeline can be made of carbon steel or ND steel, air flows in the pipeline, flue gas flows outside the pipeline, and the heating area and the pipeline specification are calculated and determined according to specific projects and parameters.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present utility model, which is intended to be covered by the claims of the present utility model.
Claims (10)
1. The utility model provides a domestic waste burns air heater which characterized in that: comprises steam-air heat exchangers and flue gas-air heat exchangers which are arranged in parallel; the steam-air heat exchanger takes steam as a working medium and is provided with a steam inlet and a drain outlet, and air exchanges heat with the steam outside the steam-air heat exchanger; air subjected to heat exchange by the steam-air heat exchanger is communicated with the flue gas-air heat exchanger; the flue gas-air heat exchanger takes air as a working medium and is provided with an air inlet and an air outlet, and the flue gas exchanges heat with the air outside the flue gas-air heat exchanger.
2. A domestic waste incineration air preheater according to claim 1, characterised in that: the air inlet and the air outlet are both arranged on the air preheater shell.
3. A domestic waste incineration air preheater according to claim 2, characterised in that: the air preheater is characterized in that a partition plate is arranged in the air preheater shell, the space in the air preheater shell is divided into two independent air chambers through the partition plate, one air chamber is used as the hot air inlet of the flue gas-air heat exchanger, and the other air chamber is used as the hot air outlet of the flue gas-air heat exchanger.
4. A domestic waste incineration air preheater according to claim 3, characterised in that: the cross section of the partition plate is L-shaped and consists of two side arms with a certain included angle.
5. The domestic waste incineration air preheater according to claim 4, wherein: an obtuse angle is formed between the two side arms of the partition board.
6. A domestic waste incineration air preheater according to claim 1, characterised in that: the arrangement direction of the steam-air heat exchanger is perpendicular to the arrangement direction of the flue gas-air heat exchanger.
7. A domestic waste incineration air preheater according to claim 1 or 6, characterised in that: the flue gas-air heat exchanger is arranged below the steam-air heat exchanger.
8. A domestic waste incineration air preheater according to claim 1, characterised in that: the flue gas-air heat exchanger is arranged in the flue gas channel.
9. A domestic waste incineration air preheater according to claim 8, characterised in that: and the flue gas channel is provided with a flue gas inlet and a flue gas outlet.
10. A domestic waste incineration air preheater according to claim 1, characterised in that: the steam-air heat exchanger pipeline is made of carbon steel; the flue gas-air heat exchanger pipeline is made of carbon steel or ND steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320595554.5U CN219607153U (en) | 2023-03-23 | 2023-03-23 | Domestic garbage incineration air preheater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320595554.5U CN219607153U (en) | 2023-03-23 | 2023-03-23 | Domestic garbage incineration air preheater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219607153U true CN219607153U (en) | 2023-08-29 |
Family
ID=87746332
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320595554.5U Active CN219607153U (en) | 2023-03-23 | 2023-03-23 | Domestic garbage incineration air preheater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219607153U (en) |
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2023
- 2023-03-23 CN CN202320595554.5U patent/CN219607153U/en active Active
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