CN210153844U - Boiler flue gas treatment system capable of preventing low-temperature corrosion of tail heating surface - Google Patents
Boiler flue gas treatment system capable of preventing low-temperature corrosion of tail heating surface Download PDFInfo
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- CN210153844U CN210153844U CN201920893994.2U CN201920893994U CN210153844U CN 210153844 U CN210153844 U CN 210153844U CN 201920893994 U CN201920893994 U CN 201920893994U CN 210153844 U CN210153844 U CN 210153844U
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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
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Abstract
The utility model discloses a boiler flue gas treatment system capable of preventing the low-temperature corrosion of a heating surface at the tail part, which mainly solves the technical problems that a boiler air preheater in the prior art is easy to generate low-temperature corrosion at the flue gas side, ash blockage and denitration catalyst failure; the high-temperature economizer is sequentially connected with the high-temperature metal bag type dust collector, the selective catalytic reduction denitration device, the low-temperature economizer, the high-temperature air preheater and the organic medium evaporator, the high-temperature air preheater is connected with the organic medium condenser, the organic medium evaporator is connected with the working medium input end of the organic Rankine generator set, and the organic Rankine generator set is connected with the organic medium condenser; the organic medium condenser is connected with the variable flow working medium pump, and the variable flow working medium pump is connected with the organic medium evaporator.
Description
Technical Field
The utility model relates to a system for effectively utilizing waste heat to generate electricity and can avoid the air heater of boiler to take place low temperature corrosion in the boiler flue gas of power plant, in particular to can prevent that afterbody receives hot side low temperature corrosion's boiler flue gas processing system is applied to in the boiler that utilizes biomass power generation. Wherein the biomass is crop straw and husk, forestry residue, firewood, bamboo residue, sludge, and domestic garbage.
Background
At present, when biomass, garbage and sludge which are mixed in a power plant are combusted to generate fuel with high moisture content, the moisture content of the generated flue gas is high, when the tail part of a boiler meets a heated medium with low temperature, water vapor in the flue gas is easy to condense into dew on the wall of a low-temperature pipe, and long-time condensation causes dust deposition and corrosion on the wall of a heating surface at the tail part of a flue. In order to prevent the smoke from generating condensation and dust deposition to block a smoke channel or corrode a heating surface pipeline of the smoke channel equipment, the temperature of the smoke needs to be raised to prevent the smoke from forming condensation at the tail of the smoke channel to corrode the heating surface of the equipment at the tail of the smoke channel, and the mode causes the smoke discharging temperature at the tail of the smoke channel to be overhigh and is very unfavorable for the economic operation of a power plant. At present, the condition that the maintenance cost of the heating surface at the tail part of a boiler is high or the exhaust gas temperature of the boiler is high to influence the power generation efficiency generally exists in the biomass power generation industry.
Therefore, the characteristics of low-temperature corrosion of the heating surface at the tail part of the boiler are researched, the novel heat exchanger is developed, the requirements of safe and economic operation of the boiler are met, and the economic and safe operation of a power plant has important significance for economic development and environmental protection.
Disclosure of Invention
In the prior art, the air preheater is arranged in a flue, heat exchange is carried out between flue gas and cold air, the heating surface of the flue gas side of the air preheater is easy to generate low-temperature corrosion or deposit ash and block, if the air preheater generates low-temperature corrosion and ash blocking, heat transfer deterioration can be caused, the boiler efficiency is reduced, the maintenance cost is increased, and even if water supply is adopted as an intermediate medium for heat exchange, the effect is still unsatisfactory. When the SCR denitration technology is adopted, the phenomena of catalyst blockage and failure are easy to occur.
In order to overcome the defects that the heated surface of the air preheater of the boiler in the prior art is easy to generate low-temperature corrosion on the flue gas side, ash blockage and failure of the denitration catalyst, the system which effectively utilizes waste heat in the flue gas of the boiler of a power plant to generate electricity and can avoid the low-temperature corrosion of the air preheater of the boiler is provided, the service life of the air preheater is prolonged, the overhaul and maintenance cost of the boiler is reduced, the service cycle of the denitration catalyst is prolonged, and the heat utilization efficiency of the boiler is improved.
The purpose of the utility model can be realized through the following technical scheme: a boiler flue gas treatment system for preventing low-temperature corrosion of a tail heating surface comprises a flue, wherein a high-temperature economizer and a low-temperature economizer are arranged in the flue, and the boiler flue gas treatment system is characterized in that a high-temperature air preheater and an organic medium evaporator are also arranged in the flue, and a high-temperature metal bag type dust remover and a selective catalytic reduction denitration device are arranged outside the flue; the high-temperature economizer is sequentially connected with the high-temperature metal bag type dust collector, the selective catalytic reduction denitration device, the low-temperature economizer, the high-temperature air preheater and the organic medium evaporator through pipelines, the high-temperature air preheater is connected with an organic medium condenser arranged in an air distribution air duct through pipelines, the organic medium evaporator is connected with a working medium input end of the organic Rankine generator set through an organic medium pipeline, and a working medium output end of the organic Rankine generator set is connected with the organic medium condenser through an organic medium pipeline; the working medium output end of the organic medium condenser is connected with the variable flow working medium pump through an organic medium pipeline, the variable flow working medium pump is connected with the organic medium evaporator through an organic medium pipeline, and the organic medium pipeline is provided with valves.
The high-temperature air preheater is internally provided with a tube bundle consisting of fin tubes or light tubes.
The organic medium condenser (low-temperature air preheater) is internally provided with a tube bundle consisting of fin tubes or light tubes.
The organic medium evaporator is internally provided with a tube bundle consisting of fin tubes or light tubes.
A flue clapboard is arranged between the high-temperature economizer and the low-temperature economizer in the flue.
The utility model has the advantages that: because the flue gas has already passed through dust removal technology before entering high temperature air preheater, therefore high temperature air preheater does not have the putty problem. The organic medium condenser is arranged in the air duct, and the air preheating adopts an organic working medium as a heating medium, so that the problems of low-temperature corrosion and ash blockage are avoided. The flue gas entering the organic medium evaporator is subjected to dust removal, and the temperature drop of the flue gas is controlled by controlling the working quality of the flue gas entering the organic medium evaporator, so that the organic medium evaporator does not have the problems of ash blockage and low-temperature corrosion. In order to improve the efficiency of the boiler, the boiler must reduce the heat loss of the exhaust smoke and reduce the temperature of the exhaust smoke as much as possible, so that the most heated surfaces are arranged in the flue. The boiler flue of the utility model is provided with an organic medium evaporator besides a superheater, an economizer and an air preheater; the evaporator absorbs heat through phase change of a heat absorbing medium, so that the heat transfer area can be reduced, and the heat exchange efficiency is improved; and the temperature of the tube wall of the evaporator can be controlled by controlling the circulation quantity of the organic medium entering the evaporator, so that the temperature of the outer wall surface of the evaporator is prevented from being lower than the dew point of the flue gas, and low-temperature corrosion is prevented. The utility model has the following two characteristics: 1. the low-temperature corrosion and ash blockage on the heating surface of the air preheater can be prevented, and the reduction of boiler load or efficiency caused by the low-temperature corrosion and ash blockage of the air preheater is avoided. 2. The operation, the overhaul and the maintenance amount and the cost of the air preheater can be reduced, the boiler efficiency can be improved, and the service power can be saved.
Drawings
Fig. 1 is a flow chart of the system structure of the present invention.
In fig. 1: the device comprises a high-temperature economizer, a high-temperature metal bag type dust collector, a selective catalytic reduction denitration device, a low-temperature economizer, a high-temperature air preheater, an organic medium condenser, a variable flow working medium pump, an 8-organic Rankine generator set, an organic medium evaporator, a flue partition plate, a flue and an air duct, wherein the high-temperature economizer is 1, the high-temperature metal bag type dust collector is 2, the selective catalytic reduction denitration device is 3, the low-temperature economizer is 4, the high-temperature air preheater is 5, the organic medium.
Detailed Description
Referring to fig. 1, a boiler flue gas treatment system for preventing low-temperature corrosion of a tail heating surface comprises a flue 11, wherein a high-temperature economizer 1 (jonan jieshan boiler equipment limited) and a low-temperature economizer 4 (jonan jieshan boiler equipment limited) are arranged in the flue 11, a high-temperature air preheater 5 (jonan jieshan boiler equipment limited) and an organic medium evaporator 9 (china changjiang power group limited) are also arranged in the flue 11, and a high-temperature metal bag type dust collector 2 (fujian far-reaching environment-friendly equipment limited) and a selective catalytic reduction denitration device 3 (fujian far-reaching environment-friendly equipment limited) are arranged outside the flue 11; the high-temperature economizer 1 is sequentially connected with a high-temperature metal bag type dust collector 2, a selective catalytic reduction denitration device 3, a low-temperature economizer 4, a high-temperature air preheater 5 and an organic medium evaporator 9 through pipelines, the high-temperature air preheater 5 is connected with an organic medium condenser 6 (China Yangtze river Power group Co., Ltd.) arranged in an air distribution air duct 12 through pipelines, the organic medium evaporator 9 is connected with a working medium input end of an organic Rankine power generator set 8 through an organic medium pipeline, and a working medium output end of the organic Rankine power generator set 8 is connected with the organic medium condenser 6 through an organic medium pipeline; the working medium output end of the organic medium condenser 6 is connected with the variable flow working medium pump 7 through an organic medium pipeline, the variable flow working medium pump 7 is connected with the organic medium evaporator 9 through an organic medium pipeline, and the organic medium pipelines are provided with valves. When the device works, flue gas at 350-400 ℃ behind a high-temperature economizer (1) is guided to a high-temperature metal bag type dust collector 2 outside a boiler from a tail flue 11 of the boiler for dust removal, the flue gas with the dust concentration of 3-10 mg/L enters a selective catalytic reduction denitration device 3, the flue gas with the nitrogen oxide concentration of 10-30 mg/L returns to the tail flue 11 of the boiler, and the flue gas is discharged out of the boiler after the temperature of the flue gas is reduced to 90-130 ℃ through a low-temperature economizer 4, a high-temperature air preheater 5 and an organic medium evaporator 9; the cold air at normal temperature in the air duct 12 is heated by the organic medium condenser and the low-temperature air preheater 6, enters the high-temperature air preheater 5, and leaves the high-temperature air preheater 5 to participate in boiler combustion after the temperature is raised to over 180 ℃; a liquid organic medium (such as pentafluoropropane) with the gasification temperature of 0-100 ℃ at normal pressure is pumped into an organic medium evaporator 9 through a variable flow working medium pump 7, is heated into a gas state by flue gas in the organic medium evaporator 9 and then enters an organic Rankine generator set 8, is discharged into an organic medium condenser 6 after acting power generation in the organic Rankine generator set 8, is cooled by normal-temperature cold air in the organic medium condenser 6 and then is condensed into a liquid state to enter the next cycle.
The utility model discloses can be used to power plant's living beings, rubbish, mix boiler afterbody heating surface equipment such as burning mud and prevent that the low temperature is anticorrosive, wherein living beings are crop straw and shell, three surplus objects in forestry, inferior little firewood, bamboo remainder, mud, domestic waste.
The above embodiments are the preferred embodiments of the present invention for a boiler flue gas treatment system capable of preventing low temperature corrosion of the tail heating surface. Further modifications and changes may be made by those skilled in the art without departing from the spirit of the invention.
Claims (5)
1. A boiler flue gas treatment system capable of preventing low-temperature corrosion of a tail heating surface comprises a flue, wherein a high-temperature economizer and a low-temperature economizer are arranged in the flue, and the boiler flue gas treatment system is characterized in that a high-temperature air preheater and an organic medium evaporator are also arranged in the flue, and a high-temperature metal bag type dust remover and a selective catalytic reduction denitration device are arranged outside the flue; the high-temperature economizer is sequentially connected with the high-temperature metal bag type dust collector, the selective catalytic reduction denitration device, the low-temperature economizer, the high-temperature air preheater and the organic medium evaporator through pipelines, the high-temperature air preheater is connected with an organic medium condenser arranged in an air distribution air duct through pipelines, the organic medium evaporator is connected with a working medium input end of the organic Rankine generator set through an organic medium pipeline, and a working medium output end of the organic Rankine generator set is connected with the organic medium condenser through an organic medium pipeline; the working medium output end of the organic medium condenser is connected with the variable flow working medium pump through an organic medium pipeline, the variable flow working medium pump is connected with the organic medium evaporator through an organic medium pipeline, and the organic medium pipeline is provided with valves.
2. The boiler flue gas treatment system capable of preventing low-temperature corrosion of the tail heating surface of claim 1, wherein the boiler flue gas treatment system comprises: the high-temperature air preheater is internally provided with a tube bundle consisting of fin tubes or light tubes.
3. The boiler flue gas treatment system capable of preventing low-temperature corrosion of the tail heating surface of claim 1, wherein the boiler flue gas treatment system comprises: the organic medium condenser is internally provided with a tube bundle consisting of fin tubes or light tubes.
4. The boiler flue gas treatment system capable of preventing low-temperature corrosion of the tail heating surface of claim 1, wherein the boiler flue gas treatment system comprises: the organic medium evaporator is internally provided with a tube bundle consisting of fin tubes or light tubes.
5. The boiler flue gas treatment system capable of preventing low-temperature corrosion of the tail heating surface of claim 1, wherein the boiler flue gas treatment system comprises: and a flue partition plate is arranged between the high-temperature economizer and the low-temperature economizer in the flue.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920893994.2U CN210153844U (en) | 2019-06-14 | 2019-06-14 | Boiler flue gas treatment system capable of preventing low-temperature corrosion of tail heating surface |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920893994.2U CN210153844U (en) | 2019-06-14 | 2019-06-14 | Boiler flue gas treatment system capable of preventing low-temperature corrosion of tail heating surface |
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| CN210153844U true CN210153844U (en) | 2020-03-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110145754A (en) * | 2019-06-14 | 2019-08-20 | 上海昊熙能源科技有限公司 | It can prevent the boiler flue gas treatment system and method for back-end surfaces low-temperature corrosion |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110145754A (en) * | 2019-06-14 | 2019-08-20 | 上海昊熙能源科技有限公司 | It can prevent the boiler flue gas treatment system and method for back-end surfaces low-temperature corrosion |
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