CN204704834U - Exhaust-heat boiler flue gas low temperature dedusting redox the two poles of the earth absorption process denitration treatment system - Google Patents
Exhaust-heat boiler flue gas low temperature dedusting redox the two poles of the earth absorption process denitration treatment system Download PDFInfo
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- CN204704834U CN204704834U CN201520446348.3U CN201520446348U CN204704834U CN 204704834 U CN204704834 U CN 204704834U CN 201520446348 U CN201520446348 U CN 201520446348U CN 204704834 U CN204704834 U CN 204704834U
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Abstract
A kind of exhaust-heat boiler flue gas low temperature dedusting redox the two poles of the earth absorption process denitration treatment system, it comprises waste heat boiler, electrostatic precipitator, air-introduced machine, first absorption tower, second absorption tower and chimney, and waste heat smoke conveying duct, described waste heat boiler is provided with gas approach and exhanst gas outlet, gas approach connects waste heat conveyance conduit, exhanst gas outlet connects electrostatic precipitator import, the outlet of described electrostatic precipitator connects air-introduced machine import, described air-introduced machine is connected to the import on the first absorption tower again by the air-introduced machine outlet be provided with, described first absorption tower connects second absorption tower import by the first absorption tower outlet be provided with, described second absorption tower is connected to waste heat smoke conveying duct by the second absorption tower outlet be provided with, described waste heat smoke conveying duct connects chimney.
Description
Technical field
The utility model devises a kind of waste heat flue gas low-temperature dedusting redox the two poles of the earth absorption process denitration treatment system.
Background technology
Waste heat is the energy be not utilized in using energy source equipment, comprise high-temp waste gas waste heat, cooling medium waste heat, waste vapour waste water residual heat, high-temperature product and afterheat of slags, chemical reaction waste heat, combustible exhaust gas waste liquid and waste material waste heat etc., " 12 " period, country popularizes heat recovery technology in an all-round way in the industry that the residual heat resources such as iron and steel, glass, non-ferrous metal, chemical industry, building materials are abundant.And along with the fast development of national economy, country is more and more higher to the requirement of environmental protection, while propelling heat recovery, the clean discharge of tail gas of heat recovery boiler also comes into one's own day by day.
For glass furnace production, on April 2nd, 2011, " flat glass industry atmosphere pollutants emission standards " that Environmental Protection Department and national quality inspection and quarantine general bureau issue is specified in and implements on October 1st, 2011.With the data of the float flat glass melting furnaces of an enterprise for prototype, this glass furnace fuel is natural gas, and the emissions data of its flue gas is as following table.
| Sequence number | Parameter name | Unit | 1# kiln | 2# kiln | 3# kiln |
| 1 | Model | t/d | 250 | 500 | 600 |
| 2 | Exhaust gas temperature | ℃ | 480 | 480 | 480 |
| 3 | Exhaust gas volumn | Nm 3/h | 59000 | 90000 | 108000 |
| 4 | Particle | mg/Nm 3 | 3000 | 3000 | 3000 |
| 5 | SO 2 | mg/Nm 3 | <200 | <200 | <200 |
| 6 | NO X | mg/Nm 3 | 2350 | 3300 | 3750 |
| 7 | HCL | mg/Nm 3 | <130 | <130 | <130 |
| 8 | Fluoride | mg/Nm 3 | <5 | <5 | <5 |
As can be seen from the above table, in the glass furnace flue gas of this enterprise, particle and NOX are well beyond national standard, need to select suitable denitration dust removal system to process.
The direction of current domestic denitration research mainly contains: low-NO_x combustion technology, oxygen-enriched combustion technology, SNCR, SCR and redox absorption process.
Low-NO_x combustion technology and oxygen-enriched combustion technology are all belong to control combustion temperature, and reduce the generation of heating power nitrogen oxide, due to the non-burning characteristic of waste heat boiler, low-NO_x combustion technology and oxygen-enriched combustion technology are all not suitable for glass furnace.
SNCR belongs to the denitration technology of comparative maturity, apply very extensive, SNCR denitration technology adopts pyroreaction mode, needs flue gas in the temperature range of 950 ~ 1100 DEG C and has the sufficient reaction time, by reducing agent and NOx, former reaction occurs, generating harmless nitrogen and water.Owing to there are not temperature 950 ~ 1100 DEG C of subregions in waste heat boiler, therefore SNCR is not suitable for the denitration of waste heat boiler.
SCR denitration technology reaction condition is easy to control, and can reach very high denitration efficiency (can reach more than 90%), SCR denitration method has become the mainstream technology of domestic and international denitrating flue gas comparative maturity.Due to glass kiln owner technique, waste heat dust content is large, and granularity of dust is little, containing alkali metal, the alkaline-earth metal that can cause catalyst poisoning in dust, easily cause catalyst blockage of the micro orifice, cause the poisoning of catalyst, therefore must carry out dedusting before denitration.For 350 DEG C ~ 400 DEG C hot precipitators, due to the impact of thermal expansion, hot precipitator running status is unstable, and often cause whole system off-the-line, waste heat flue gas must be drained from bypass, very large to the injury of environment, and wastes residual heat resources.
Summary of the invention
The purpose of this utility model is to provide a kind of waste heat flue gas low-temperature dedusting redox the two poles of the earth absorption process denitration treatment system.Be not only applicable to the exhaust-heat boiler flue gas purified treatment that glass furnace is supporting, be applicable to the gas cleaning process of the high dust-laden waste heat boiler of other initial temperature ~ 500 DEG C yet.
The technical scheme of this utility model is: a kind of exhaust-heat boiler flue gas low temperature dedusting redox the two poles of the earth absorption process denitration treatment system, it comprises waste heat boiler, electrostatic precipitator, air-introduced machine, first absorption tower, second absorption tower and chimney, and waste heat smoke conveying duct, described waste heat boiler is provided with gas approach and exhanst gas outlet, gas approach connects waste heat conveyance conduit, exhanst gas outlet connects electrostatic precipitator import, the outlet of described electrostatic precipitator connects air-introduced machine import, described air-introduced machine is connected to the import on the first absorption tower again by the air-introduced machine outlet be provided with, described first absorption tower connects second absorption tower import by the first absorption tower outlet be provided with, described second absorption tower is connected to waste heat smoke conveying duct by the second absorption tower outlet be provided with, described waste heat smoke conveying duct connects chimney.
Flue gas (about 480 DEG C) enters waste heat boiler, in waste heat boiler after UTILIZATION OF VESIDUAL HEAT IN, exhaust gas temperature is about 165 DEG C.The smoke evacuation of boiler, through electrostatic precipitator, makes dust concentration be reduced to below 50mg/Nm3.Flue gas through udst separation passes into air-introduced machine and causes first grade absorption tower, flue gas is contacted fully with oxidative absorption liquid, through ideal effect of mass transmitting, part nitrogen oxide in flue gas and absorbing liquid are obtained by reacting remove, after first grade absorption tower process, not removing only a small amount of part nitrogen oxide and improve the oxidizability (NO2/NOX concentration ratio) of NOx in flue gas, then enter two-level absorption tower again, NOx in flue gas is absorbed by liquid absorption again, enters chimney high altitude discharge after flue gas is effectively purified by flue.
The beneficial effects of the utility model are: be not only applicable to the exhaust-heat boiler flue gas purified treatment that glass furnace is supporting, are also applicable to the gas cleaning process of the high dust-laden waste heat boiler of other initial temperature ~ 500 DEG C, and structure is simple, and use safety is stablized, and utilization rate is high.Therefore, utility model is worthy to be popularized.
Accompanying drawing explanation
Fig. 1 is the utility model example structure schematic diagram.
Detailed description of the invention
Below in conjunction with accompanying drawing, structure of the present utility model and principle are described further.
As shown in Figure 1, the present embodiment is: a kind of exhaust-heat boiler flue gas low temperature dedusting redox the two poles of the earth absorption process denitration treatment system, it comprises waste heat boiler 1, electrostatic precipitator 2, air-introduced machine 3, first absorption tower 4, second absorption tower 5 and chimney 6, and waste heat smoke conveying duct 7, described waste heat boiler 1 is provided with gas approach and exhanst gas outlet, gas approach connects waste heat conveyance conduit 7, exhanst gas outlet connects electrostatic precipitator 2 import, the outlet of described electrostatic precipitator 2 connects air-introduced machine 2 import, described air-introduced machine 2 is connected to the import on the first absorption tower 4 again by air-introduced machine 2 outlet be provided with, described first absorption tower 4 is exported by the first absorption tower 4 be provided with and connects second absorption tower 5 import, described second absorption tower 5 is connected to waste heat smoke conveying duct 7 by second absorption tower 5 outlet be provided with, described waste heat smoke conveying duct 7 connects chimney 6.
During use, enter waste heat boiler 1 by high-temperature residual heat flue gas, can produce steam, steam may be used for generating or production technology heat supply.The exhaust gas temperature simultaneously reducing flue gas makes flue gas can meet the service condition of conventional electrostatic precipitator.Waste heat flue gas removes NOX after being reacted with absorbing liquid in two-stage absorption tower by electrostatic precipitator removal particle and waste heat flue gas.Make the flue gas qualified discharge standard of waste heat boiler.
Claims (1)
1. exhaust-heat boiler flue gas low temperature dedusting redox the two poles of the earth absorption process denitration treatment system, it comprises waste heat boiler, electrostatic precipitator, air-introduced machine, first absorption tower, second absorption tower and chimney, and smoke conveying duct, it is characterized in that: described waste heat boiler is provided with gas approach and exhanst gas outlet, gas approach connects waste heat conveyance conduit, exhanst gas outlet connects electrostatic precipitator import, the outlet of described electrostatic precipitator connects air-introduced machine import, described air-introduced machine is connected to the import on the first absorption tower again by the air-introduced machine outlet be provided with, described first absorption tower connects second absorption tower import by the first absorption tower outlet be provided with, described second absorption tower is connected to waste heat smoke conveying duct by the second absorption tower outlet be provided with, described waste heat smoke conveying duct connects chimney.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107420927A (en) * | 2017-08-04 | 2017-12-01 | 中节能工业节能有限公司 | A kind of fire coal boiler fume high-efficient purification and UTILIZATION OF VESIDUAL HEAT IN technique |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107420927A (en) * | 2017-08-04 | 2017-12-01 | 中节能工业节能有限公司 | A kind of fire coal boiler fume high-efficient purification and UTILIZATION OF VESIDUAL HEAT IN technique |
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