CN219482155U - Energy-conserving receipts water system of flue gas - Google Patents
Energy-conserving receipts water system of flue gas Download PDFInfo
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- CN219482155U CN219482155U CN202320603205.3U CN202320603205U CN219482155U CN 219482155 U CN219482155 U CN 219482155U CN 202320603205 U CN202320603205 U CN 202320603205U CN 219482155 U CN219482155 U CN 219482155U
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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
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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Abstract
The utility model relates to a flue gas energy-saving water receiving system, and belongs to the technical field of flue gas energy conservation. This energy-conserving water system of receiving of flue gas, including the desulfurization absorption tower, direct condensation heat exchange tower and air humidifying tower, the bottom of desulfurization absorption tower flue gas export through the direct condensation heat exchange tower of pipeline intercommunication, the bottom of direct condensation heat exchange tower is through the import of condensing pipeline intercommunication heat exchanger of getting, be equipped with the condensate water circulating pump on the condensing pipeline, the export of heat exchanger of getting is through circulating pipeline intercommunication first spray layer, air humidifying tower's inside has set gradually second spray layer and second defogging layer from down up, the entry of second spray layer is through pipeline intercommunication circulating pipeline, air humidifying tower's bottom is through the first spray layer of humidification return pipeline intercommunication, be equipped with air humidifying return pump on the humidification return pipeline. The beneficial effects are that: the maximum utilization of the flue gas waste heat can be realized, the efficiency of the boiler can be improved, the recovery of water is realized, and the recovered heat is mainly used for heating and heating systems.
Description
Technical Field
The utility model belongs to the technical field of flue gas energy conservation, and particularly relates to a flue gas energy-saving water receiving system.
Background
The limestone-gypsum wet desulfurization technology is the most widely applied flue gas desulfurization technology, has the advantages of low investment, low operation cost, wide application range and the like, but needs to consume a large amount of process water, and is difficult to bear such large water consumption especially in areas with lack of water resources. And a great part of consumed process water is used for cooling the flue gas, and the water is changed from liquid phase to gas phase, so that a great amount of phase change heat is lost.
The wet desulfurization technology utilizes desulfurization slurry and the like to realize the removal of pollutants such as SO2 and the like in flue gas. In the washing process, the high-temperature flue gas is cooled, releases heat and evaporates a large amount of water, the desulfurization product needs to be discharged and carry part of water, in addition, pollutants such as chlorine and the like are prolonged along with the desulfurization time, part of wastewater needs to be discharged, and a large amount of process water is necessarily supplemented for wet desulfurization. After the high-temperature flue gas is cooled, the flue gas is saturated by water, a large amount of water is evaporated, the flue gas contains a large amount of saturated water, a large amount of phase change heat is contained in the flue gas, and how to recycle the latent heat of the water in the flue gas is a problem to be solved urgently at present. The heat in the flue gas is directly utilized, and the implementation is difficult due to the problems of acid dew point and equipment materials. The clean flue gas saturated by the flue gas contains a large amount of heat, but the heat taste is low, and the direct conversion into high-quality electric energy is difficult, but after the heat quality is improved by equipment such as a heat pump, the heat pump can be used for systems requiring heating, heat supply and the like, and can also be used for heating air, humidifying and the like to improve the heat efficiency of a boiler.
The spraying absorption condensation heat exchange device applied in industry can recycle a large amount of water, adopts a plurality of layers of spraying layers, but the cold source used for cooling at present is mostly air, heat is wasted actually, and only the purpose of collecting water but not saving energy can be achieved.
Disclosure of Invention
The utility model aims to solve the technical problems and provide the flue gas energy-saving water receiving system which can realize the maximum utilization of the flue gas waste heat, can improve the efficiency of a boiler, realizes the recovery of water and is mainly used for heating and a heating system.
The technical scheme for solving the technical problems is as follows: this but energy-conserving water system of receiving of flue gas includes: the desulfurization absorption tower, direct condensation heat exchange tower and air humidifying tower, the lateral wall of desulfurization absorption tower is equipped with the flue gas import, and the top is equipped with the flue gas export, the flue gas export passes through the pipeline intercommunication the bottom of direct condensation heat exchange tower, the inside of direct condensation heat exchange tower is from down upwards setting gradually heat exchange enhancement layer, first spray layer and first defogging layer, the bottom of direct condensation heat exchange tower is through the import of condensing duct intercommunication heat exchanger of getting, be equipped with the condensate water circulating pump on the condensing duct, the export of heat exchanger of getting passes through circulating duct intercommunication first spray layer, the inside of air humidifying tower is from down upwards setting gradually second spray layer and second defogging layer, the entry of second spray layer passes through the pipeline intercommunication circulating duct, the bottom of air humidifying tower is through humidification return pipeline intercommunication first spray layer, be equipped with the air humidification return pump on the humidification return pipeline.
On the basis of the technical scheme, the utility model can be improved as follows.
Preferably, the bottom of the direct condensation heat exchange tower is communicated with the desulfurization absorption tower through a pipeline, and a water collecting pump is arranged on the pipeline.
Preferably, the pipeline between the bottom of the direct condensation heat exchange tower and the desulfurization absorption tower is also communicated with a water receiving buffer tank, an outlet of the water receiving buffer tank is connected with a water supply pipeline, and an outer drainage pump is arranged on the water supply pipeline.
Preferably, the water receiving buffer tank is also communicated with an alkali liquor regulating system.
Preferably, a flue gas inlet is formed in the side wall of the air humidifying tower, and an air heater is arranged on the flue gas inlet.
Preferably, the second demisting layer is any one of a filter type dust remover, a flat plate type demister, a ridge type demister, a cyclone plate demister and a tube bundle type dust remover.
Preferably, the air heater and the heat-taking heat exchanger are any one of a plate heat exchanger, a tube type heat exchanger and a shell-and-tube heat exchanger.
Preferably, the heat exchange enhancement layer is any one of a turbulator, a filler layer and a porous gas distribution device.
The beneficial effects are that:
1. the direct condensation heat exchange tower has the function of removing secondary pollutants, and the outlet flue gas is cleaner;
2. the utilization of heat energy with large quantity and low grade in the clean flue gas is realized, and the heat energy can be used for heating and the like, and the heat grade is further improved, and the heat energy can also be used for power generation and the like;
3. the cooling effect of direct air heat exchange is better, and the efficiency of flue gas water collection can be improved;
4. the efficiency of the boiler can be improved by humidifying air, and the air humidifying process flow is simple and convenient;
5. the equipment used by the whole set of device is a conventional device, and is easy to implement;
6. the water quality of the water is good, the water can be directly used for desulfurization and water supplement, and the water can be applied to other process systems as general process water after simple physical filtration and pH value adjustment, wherein the water has low soluble salt content, and the water can be used for boiler water supplement after treatment.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
In the drawings, the list of components represented by the various numbers is as follows:
1. a desulfurizing absorption tower; 2. directly condensing the heat exchange tower; 3. an air humidifying tower; 4. a water collecting pump; 5. a condensate water circulation pump; 6. an air humidification return pump; 7. an air heater; 8. an outer drainage pump; 9. a water receiving buffer tank; 10. a heat-taking heat exchanger; 11. an alkali liquor regulating system; 12. a flue gas inlet; 13. a condensing duct; 14. a circulation pipe; 15. humidification return line.
Detailed Description
The principles and features of the present utility model are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the utility model and are not to be construed as limiting the scope of the utility model.
Examples
As shown in fig. 1, this embodiment provides a flue gas energy-saving water receiving system, including: the desulfurization absorption tower 1, direct condensation heat exchange tower 2 and air humidifying tower 3, the lateral wall of desulfurization absorption tower 1 is equipped with flue gas inlet 12, and the top is equipped with the flue gas export, the flue gas export passes through the pipeline intercommunication the bottom of direct condensation heat exchange tower 2, the inside of direct condensation heat exchange tower 2 has set gradually heat exchange enhancement layer 2a, first spray layer 2b and first defogging layer 2c from down upwards, the import of heat exchanger 10 is got through condensation pipeline 13 intercommunication in the bottom of direct condensation heat exchange tower 2, be equipped with condensate water circulating pump 5 on the condensation pipeline 13, the export of heat exchanger 10 is got through circulation pipeline 14 intercommunication first spray layer 2b, the inside of air humidifying tower 3 has set gradually second spray layer 3a and second defogging layer 3b from down upwards, the entry of second spray layer 3a passes through pipeline intercommunication circulation pipeline 14, the bottom of air humidifying tower 3 passes through humidification return pipeline 15 intercommunication first spray layer 2b, be equipped with air humidifying pump 6 on the return pipeline 15.
After desulfurization of boiler flue gas through desulfurization absorption tower 1, clean flue gas gets into the bottom of direct condensation heat transfer tower 2, exchanges heat with the water after the cooling that tower upper portion first sprays layer 2b sprays, and the heat transfer takes place in heat exchange enhancement layer 2a, and heat in the flue gas is transferred to circulating water after the heat transfer, and circulating water's temperature risees, and the flue gas is discharged after passing through first spraying layer 2b by first defogging layer 2c defogging after the heat transfer, and the saturated vapor in this in-process flue gas takes place the phase transition and changes liquid phase from the gas phase, reaches the purpose of collecting water simultaneously. The heated circulating water is subjected to heat exchange by the heat-taking heat exchanger 10, heat is released to a heat-using medium, the temperature is reduced, and the cooled water returns to the direct condensation heat exchange tower 2. The circulating process of circulating water is powered by a condensing water circulating pump 5, part of circulating water goes to an air humidifying tower 3 for humidifying air, the air enters from the bottom of the air humidifying tower and is discharged from the top of the tower to a boiler after being humidified, the circulating water at the bottom of the tower returns to a direct condensing heat exchange tower 2 by an air humidifying return pump 6, an air heater 7 is arranged at a flue gas inlet of the air humidifying tower 3, icing is prevented, and meanwhile, the air humidifying effect and the heat efficiency are improved.
The air heater 7 needs to be reasonably adjusted according to the process requirement and the change of the local temperature, the heating dosage is controlled, the temperature and the humidity of the air are regulated, the heat efficiency of the whole system is highest, and the purposes of energy saving and water collection are achieved; the start-stop of the system of the heat-taking heat exchanger 10 and the air humidifying tower 3 is determined according to the requirements of refrigeration and heat exchange, and the cost and benefit.
The direct condensation heat exchange tower 2 is connected with the top outlet of the desulfurization absorption tower 1 through a flue, and the water is collected by the direct condensation heat exchange tower 2 and then discharged into the atmosphere, so that the secondary trapping of pollutants and particulate matters is realized; the clean flue gas condensate water at the bottom of the direct condensation heat exchange tower 2 is used for supplementing water for the desulfurization device through the water collecting pump 4 and can be discharged to the water collecting buffer tank 9, the outer drainage pump 8 provides process water supply, and the water collecting buffer tank 9 is simultaneously provided with an alkali liquor regulating system 11 for regulating the pH value of recovery.
The second demisting layer 3b is any one of a filter type dust collector, a flat plate type demister, a ridge type demister, a cyclone plate demister and a tube bundle type dust collector; the air heater 7 and the heat-taking heat exchanger 10 are any one of a plate heat exchanger, a tube type heat exchanger and a tube type heat exchanger; the heat exchange enhancement layer 2a is any one of a turbulator, a filler layer and a porous gas distribution device.
The equipment is arranged:
the desulfurization absorption tower 1 is arranged in a desulfurization reserved area, the direct condensation heat exchange tower 2 is arranged on the upper portion of the desulfurization absorption tower 1, an air lifting device is adopted between the two towers to be connected, when the space is enough, the air humidification tower 3 is also placed on the upper portion of the direct condensation heat exchange tower 2, the arrangement of an air system needs to fully utilize natural air temperature conditions, the comprehensive consideration of operation and investment cost is carried out, whether the arrangement is carried out on the top of the direct condensation heat exchange tower 2 or the arrangement is carried out singly, the water receiving buffer tank 9 is arranged near the desulfurization absorption tower 1 and the direct condensation heat exchange tower 2, and auxiliary heat exchangers, pumps and the like are optimally arranged according to the positions of a tower, a boiler and the like.
The process flow comprises the following steps:
the raw flue gas temperature is about 110-165 ℃, the raw flue gas enters a desulfurization absorption tower 1 for desulfurization, the desulfurized clean flue gas temperature is about 55-72 ℃ and enters a direct condensation heat exchange tower 2, the temperature is reduced by intense steam-water mixing with circulating water in a direct condensation heat exchanger, the cooled clean flue gas temperature is about 35-65 ℃, heat in the flue gas comprises sensible heat of the flue gas and latent heat of water and is released into the circulating water, the temperature is increased, in the flue gas cooling process, the steam is condensed to form tiny fog drops or is adhered to liquid drops sprayed out of a spraying layer, and part of SO in the flue gas is reduced simultaneously 2 The flue gas can be absorbed, meanwhile, particles in the flue gas can be trapped secondarily, most of tiny liquid drops fall together with spray liquid after being trapped in a first demisting layer 2c arranged at the upper part of the direct condensation heat exchange tower 2, and the flue gas is discharged along with cooling of the flue gas, so that the flue gas is purified secondarily;
the cooling circulating water is heated in the direct condensation heat exchange tower 2, meanwhile, the water in the flue gas is cooled and recovered, and the cooled and recovered water is pumped to a desulfurization device for water supplementing through a water collecting pump or is sent to a water collecting buffer tank 9 for process water supplementing and water using an outer drainage pump 8;
the circulating water is supplied with power through the condensed water circulating pump 5, and is firstly sent to the heat-taking heat exchanger 10, heat recovered from flue gas is transferred to a heat-using medium, cooled circulating water is returned to the direct condensation heat exchange tower 2, part of circulating water is sent to the air humidifying tower 3 for air humidification, the temperature of the circulating water after humidifying the air is also reduced, and the circulating water is returned to the direct condensation heat exchange tower 2 to complete circulation.
In the description of the present utility model, it should be understood that the terms "center", "length", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "inner", "outer", "peripheral side", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the system or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
The foregoing description of the preferred embodiments of the utility model is not intended to limit the utility model to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the utility model are intended to be included within the scope of the utility model.
Claims (8)
1. A flue gas energy-saving water receiving system, comprising:
the desulfurization absorption tower (1), direct condensation heat exchange tower (2) and air humidifying tower (3), the lateral wall of desulfurization absorption tower (1) is equipped with flue gas inlet (12), and the top is equipped with the exhanst gas outlet, exhanst gas outlet passes through pipeline intercommunication the bottom of direct condensation heat exchange tower (2), the inside of direct condensation heat exchange tower (2) has set gradually heat exchange enhancement layer (2 a), first spray layer (2 b) and first defogging layer (2 c) from down upwards, the import of heat exchanger (10) is got through condensation pipeline (13) intercommunication in the bottom of direct condensation heat exchange tower (2), be equipped with condensate water circulating pump (5) on condensation pipeline (13), the export of heat exchanger (10) is through circulation pipeline (14) intercommunication first spray layer (2 b), the inside of air humidifying tower (3) is from down upwards setting gradually second spray layer (3 a) and second defogging layer (3 b), the entry of second spray layer (3 a) is through pipeline intercommunication circulation pipeline (14), the bottom of returning air humidifying tower (3) returns through return humidification pipeline (15) return air humidifying layer (15).
2. The flue gas energy-saving water receiving system according to claim 1, wherein the bottom of the direct condensation heat exchange tower (2) is communicated with the desulfurization absorption tower (1) through a pipeline, and a water receiving pump (4) is arranged on the pipeline.
3. The flue gas energy-saving water receiving system according to claim 2, wherein a pipeline between the bottom of the direct condensation heat exchange tower (2) and the desulfurization absorption tower (1) is also communicated with a water receiving buffer tank (9), an outlet of the water receiving buffer tank (9) is connected with a water supply pipeline, and an outer drainage pump (8) is arranged on the water supply pipeline.
4. A flue gas energy saving water receiving system according to claim 3, wherein the water receiving buffer tank (9) is also connected to an alkaline liquor regulating system (11).
5. The flue gas energy-saving water receiving system according to claim 1, wherein a flue gas inlet is arranged on the side wall of the air humidifying tower (3), and an air heater (7) is arranged on the flue gas inlet.
6. The flue gas energy-saving water receiving system according to claim 5, wherein the second mist elimination layer (3 b) is any one of a filter type dust collector, a flat plate type mist eliminator, a ridge type mist eliminator, a cyclone plate mist eliminator, and a tube bundle type dust collector.
7. The flue gas energy-saving water receiving system according to claim 5, wherein the air heater (7) and the heat-taking heat exchanger (10) are any one of a plate heat exchanger, a tube-in-tube heat exchanger and a shell-and-tube heat exchanger.
8. The flue gas energy-saving water receiving system according to any one of claims 1 to 7, wherein the heat exchange enhancement layer (2 a) is any one of a turbulator, a filler layer, and a porous gas distribution device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320603205.3U CN219482155U (en) | 2023-03-24 | 2023-03-24 | Energy-conserving receipts water system of flue gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320603205.3U CN219482155U (en) | 2023-03-24 | 2023-03-24 | Energy-conserving receipts water system of flue gas |
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| Publication Number | Publication Date |
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| CN219482155U true CN219482155U (en) | 2023-08-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320603205.3U Active CN219482155U (en) | 2023-03-24 | 2023-03-24 | Energy-conserving receipts water system of flue gas |
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| CN (1) | CN219482155U (en) |
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2023
- 2023-03-24 CN CN202320603205.3U patent/CN219482155U/en active Active
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