CN2757903Y - Heat storage type SCR denitrating and dioxime removing equipment - Google Patents
Heat storage type SCR denitrating and dioxime removing equipment Download PDFInfo
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- CN2757903Y CN2757903Y CN 200420108611 CN200420108611U CN2757903Y CN 2757903 Y CN2757903 Y CN 2757903Y CN 200420108611 CN200420108611 CN 200420108611 CN 200420108611 U CN200420108611 U CN 200420108611U CN 2757903 Y CN2757903 Y CN 2757903Y
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Abstract
The utility model discloses a heat storage type SCR denitrating and dioxime removal device. The utility model is mainly composed of a heating chamber, a heat discharging tank and a heat storage tank, wherein the heat discharging tank and the heat storage tank are positioned on the lower part of the heating chamber which is used for fully or singly heating the heat discharging tank and the heat storage tank, and are communicated through a connection pipeline. The utility model is characterized in that the lower part of the connection pipeline and the interiors of the heat discharging tank and the heat storage tank are respectively provided with a touching medium which can remove harmful ingredients in exhaust air. The utility model has the advantage that the structure is simple; the cost is low; the removal rate of nitrous oxides and dioxime harmful ingredients in the exhaust air is high; the energy is saved; through changing the flow direction of the exhaust air, the original heat discharging tank is changed into a heat absorption tank, the original heat absorption tank is changed into the heat discharging tank, the heat generated in the exhaust air treatment process is used for carrying out the exhaust air treatment (heating the exhaust air and touching the medium), and thus the utility model can furthest reduce the work times and the work time of the heating chamber, and causes the heat recovery efficiency to achieve 90-95%.
Description
Technical Field
The utility model relates to a waste gas treatment equipment, especially a to the treatment facility of the waste gas that contains nitrogen oxide and DIOXIN (DIOXIN) toxic composition, specifically speaking is a heat accumulation formula SCR (selective catalytic reduction) denitration and DIOXIN remove equipment.
Background
With the progress of the times and the relative serious problems of air pollution, the governments are not willing to improve the brain juice, and with the stricter environmental protection requirements, the industrial world has more urgent need for effective air pollution control, as is well known, the general air pollution and the pollution harmful to human body can be classified into volatile organic solvent (VOC) waste gas, nitrogen oxide (NOx) and Dioxin (Dioxin), etc., under the research and development of many researchers, the air pollution of volatile organic solvent waste gas, nitrogen oxide and Dioxin, etc. has been effectively controlled and treated one by one, and the related treatment technologies are described as follows:
firstly, a treatment technology of volatile organic solvent (VOC) in waste gas.
The present invention mainly adopts a heat accumulating (RTO)/heat accumulating catalyst (RCO) incinerator combustion method, which is to burn the waste gas of volatile organic solvent, as shown in FIG. 1, it is known that the heat accumulating/heat accumulating catalyst incinerator is mainlyto set a heat releasing tank B and a heat accumulating tank C at the bottom end of a combustion chamber A, respectively, the heat releasing tank B and the heat accumulating tank C are set with heat accumulating ceramics B1 and C1 (which can be honeycomb, flat plate or saddle), and a burner D is set at the upper end of the combustion chamber A for the combustion of the waste gas of volatile organic solvent, and the heat accumulating ceramics B1 and C1 in the heat releasing tank B and the heat accumulating tank C are used to recover the high temperature heat energy after the waste gas of organic solvent is incinerated and heat the waste gas of organic solvent entering the combustion chamber A, in order to reach the temperature required for incinerating the organic solvent exhaust gas, generally speaking, if there is no organic solvent catalyst added, the incineration temperature is about 815 ℃, if there is an organic solvent catalyst added, the incineration temperature is about 350 ℃, when in use (as shown in fig. 2 and 3), the low temperature organic solvent exhaust gas flows into the heat release tank B of the regenerative/regenerative catalyst incinerator, the organic solvent exhaust gas temperature is heated to the temperature required for incineration 815 ℃ or 350 ℃ in the combustion chamber a, the high temperature clean gas after incineration in the combustion chamber a flows through the heat release tank C to recover the heat energy and then flows out of the regenerative/regenerative catalyst incinerator, as shown in fig. 2; when the temperature of the heat-releasing tank B for heating the organic solvent waste gas is lower than a predetermined value, the control damper switch is activated to switch the heat-releasing tank B, so as to change the direction of the heat-releasing tank C flowing into and out of the combustion chamber A of the incinerator, so that the original heat-storing tank C is changed into the heat-releasing tank C for heating the organic solvent waste gas, and the original heat-releasing tank B is changed into the heat-storing tank B for absorbing the high-temperature energy after incineration (as shown in FIG. 3).
And secondly, a technology for treating nitrogen oxides (NOx) in the exhaust gas.
The technology for treating nitrogen oxides, which is most efficient by Selective Catalytic Reduction (SCR) in the current solution, has been developed and experienced for many years at home and abroad, and it is proved that the conversion efficiency of nitrogen oxides can reach more than 90%, and it is the control technology of the highest denitration (De-NOx) efficiency, and the selective catalytic reduction denitration system is an economical, safe and non-secondary pollution method for treating nitrogen oxides, and the principle is shown in fig. 4, which is known from fig. 4, and it utilizes oxidation-reduction method to inject ammonia (NH) into the system3) E as a reducing agent, while the nitrogen oxides and ammonia E gas flow through the catalyst bed F, reducing the nitrogen oxides to nitrogen (N)2) And water (H)2O), and ammonia E is also oxidized to nitrogen (N)2) And water (H)2O), the main reaction formula and the flow scheme are as follows:
wherein NO is nitric oxide, NO2Is nitrogen dioxide, NH3Is ammonia, O2Is oxygen;
the above-mentioned reduction method using a selective catalyst has the following advantages:
one is as follows: has a high conversion rate of nitrogen oxides.
The second step is as follows: the applicable temperature range is 250-400 ℃, and the operation condition is less limited.
And thirdly: the catalyst can be in honeycomb type, flat plate type or wave type, and can reduce pressure without affecting the original operation procedure.
Fourthly, the method comprises the following steps: to SO2Has low oxidizing power and does not generate the poison of sulfate.
And fifthly: has low ammonia leakage and can avoid secondary pollution.
And thirdly, treating Dioxin (Dioxin) in the exhaust gas.
Although the dioxin produced in the incineration process of municipal refuse, industrial waste or medical waste can be completely decomposed at high temperature, part of dioxin residues or dioxin decomposed in the cooling process can be polymerized to form dioxin, so that in order to avoid the emission of dioxin, the dioxin is treated by an active carbon adsorption method in the early stage, then, because the active carbon adsorption method only adsorbs the dioxin on active carbon and cannot decompose the dioxin, the dioxin can be leached by underground water after being buried by waste active carbon and then returns to a food chain after being absorbed by plants, and finally is absorbed by human to influence the health of human beings and cause secondary pollution to the environment, and the existing treatment method utilizes an octogen catalyst reactor to treat the dioxin, so that the emission of the treated dioxin conforms to environmental regulations, because the dioxin catalyst can completely decompose dioxin, there is no secondary pollution problem, and it is a better method to solve the century's poison-dioxin, as the existing processing system can be seen from fig. 5, it can be known from fig. 5 that the technology of removing dioxin with dioxin catalyst is to introduce dioxin gas into a heat exchanger G and then into a heater H to heat to above 250 ℃ to reach the decomposition reaction temperature of dioxin, and then into a dioxin catalyst converter I to achieve the decomposition of dioxin. The existing dioxin removal catalyst has to meet the following conditions:
first, low particulate contamination: the particulate contaminant concentration in the flue gas entering dioxin must be very low (<10 mg/NM)3) To avoid clogging and poisoning of the dioxin catalyst, and thus to avoid the flow of incinerators for municipal, industrial or medical wastesIn the process, it must be placed after a bag collector or an electrostatic precipitator.
II, low sulfur oxide: since sulfur oxides poison the dioxin catalysts, the sulfur oxide concentration in the flue gas must be very low (<250ppmvd), and therefore, in the process of incinerators for municipal wastes, industrial wastes, or medical wastes, it must be placed after a semi-dry or wet acid removal tower.
Thirdly, reaction temperature: since the reaction temperature of dioxin must be above 250 ℃, but since the temperature of flue gas after passing through the acid removal tower and the bag collector is reduced to below 150 ℃, it must be heated to above 250 ℃ to reach the reaction temperature for decomposition of dioxin.
In summary, the regenerative/regenerative catalytic incinerator method, the selective catalytic reduction method of nitrogen oxide control technology and the dioxin catalytic reactor are the best methods for treating the air pollution such as volatile organic solvent exhaust gas, nitrogen oxide and dioxin, and have been used for many years, and have certain effects, but still have the following common disadvantages:
one is as follows: the regenerative/regenerative catalytic incinerator method, the selective catalytic reduction method of nitrogen oxide control technology, and the dioxin catalytic reactor canonly treat the air pollution such as volatile organic solvent exhaust gas, nitrogen oxide, and dioxin alone, but cannot treat the air pollution simultaneously.
The second step is as follows: the nitrogen oxide control technology selective catalyst reduction method and the dioxin catalyst reactor both need to reach the processing temperature, wherein the processing temperature of the nitrogen oxide is 250-400 ℃, and the processing temperature of the dioxin catalyst reactor is above 250 ℃, therefore, both need to have a heater to perform the system heating, the heating resource cost is quite expensive, and statistics show that the heating resource cost spent in a processing system for one year is thousands of thousands, which causes the high processing cost and the high burden of manufacturers.
And thirdly: the heat recovery rate of the heat recovered by the heat exchanger is only about 60 to 70%, resulting in waste of heat energy.
Disclosure of Invention
The utility model aims at designing a but harmful waste gas of concurrent processing removal nitrogen oxide (NOx) and Dioxin, do according to the required independent processing nitrogen oxide of actual waste gas composition or the harmful waste gas of Dioxin person, make the heat recovery efficiency of its whole equipment can reach about 90 ~ 95%, mainly install the denitration catalyst alone in heat release tank and the heat accumulation inslot in the heat accumulation system and remove nitrogen oxide (NOx) or install the Dioxin catalyst alone and remove Dioxin, perhaps install denitration catalyst and Dioxin catalyst simultaneously and remove heat accumulation formula SCR denitration and the Dioxin removal equipment of nitrogen oxide and Dioxin.
The technical scheme of the utility model is that:
a heat accumulating SCR denitration and dioxin removing equipment mainly comprises a heating chamber, a heat releasing tank and a heat accumulating tank, wherein the heat releasing tank and the heat accumulating tank are positioned at the lower part of the heating chamber for heating all or independently and are communicated through a connecting pipeline, and the equipment is characterized in that contact media capable of removing harmful ingredients in waste gas are respectively arranged in the heat releasing tank and the heat accumulating tank and below the connecting pipeline. The catalyst is coated on the surface of the carrier to form an integral structure.
The utility model discloses following technical measure has further been taken:
the catalyst on the surface of the catalyst can be a nitrogen oxide denitration catalyst, a dioxin catalyst or a catalyst combined with the dioxin catalyst.
The contact medium is either honeycomb type, flat plate type, wave type or particle type.
The inner walls of the heat release groove and the heat storage groove are made of heat storage ceramics.
The heat release groove and the heat storage groove can be mutually replaced according to the change of the flow direction of the waste gas, namely, the heat release groove is changed into the heat storage groove, and the heat storage groove is changed into the heat release groove.
The exhaust gas flow direction is controlled by a corresponding exhaust damper switch.
The utility model has the advantages that:
1. simple structure and low manufacturing cost.
2. The removal rate of the harmful components of the nitrogen oxide and the dioxin in the waste gas is high, the toxic components of the nitrogen oxide or the dioxin in the waste gas can be removed independently, and the toxic components of the nitrogen oxide and the dioxin in the waste gas can be simultaneously removed.
3. The energy saving can become heat absorption groove with original heat release groove through the flow direction that changes waste gas, becomes heat release groove with original heat absorption groove, makes the heat that produces in the exhaust-gas treatment process in turn be used for carrying out exhaust-gas treatment (heating waste gas and touch the medium), can furthest reduce the number of times and the time of work of heating chamber, makes heat recovery efficiency can reach 90 ~ 95%.
Drawings
FIG. 1 is a sectional view of a heat accumulating type/heat accumulating catalyst type incinerator according to the background art of the present invention.
FIG. 2 is a schematic flow chart showing the operation of a heat accumulating type/heat accumulating catalyst type incinerator according to the background art of the present invention.
FIG. 3 is a schematic flow chart showing another use of the heat accumulating type/heat accumulating catalyst type incinerator according to the background art of the present invention.
Fig. 4 is a flow chart of a control technique of nitrogen oxides in the background of the invention.
FIG. 5 is a flow chart of a catalyst-removing dioxin system according to the background of the present invention.
Fig. 6 is a schematic structural diagram of the present invention.
Fig. 7 is one of the exhaust gas flow diagrams in the use state of the present invention.
Fig. 8 is a second exhaust gas flowdiagram in the use state of the present invention.
In FIGS. 1 to 8: a is a heating chamber; b is a heat release groove; c is a heat storage tank; b1 and C1 are heat storage ceramics; d is a burner or an electric heater; e is ammonia; f is a catalyst bed; g is a heat exchanger; h is a heater; i is a dioxin-catalyst converter; 1: denitration catalyst and dioxin catalyst.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples.
As shown in fig. 6, 7, 8.
A heat accumulating type SCR denitration and Dioxin removing device is characterized in that a heat release groove B and a heat accumulation groove C which are respectively arranged at the bottom end of a heating chamber A are internally provided with heat accumulation ceramics B1 and C1, and are also separately provided with denitration catalysts for removing nitrogen oxides (NOx) or are separately provided with Dioxin catalysts for removing Dioxin, or can be simultaneously provided with denitration catalysts and Dioxin catalysts 1 for removing nitrogen oxides and Dioxin, wherein the heat release groove B and the heat accumulation groove C of the heat accumulation system use the heat accumulation ceramics B1 and C1, can simultaneously treat harmful waste gases for removing nitrogen oxides (NOx) and Dioxin, and can also independently treat the nitrogen oxides or Dioxin harmful waste gases according to the actual waste gas components, when low-temperature waste gases flow into the heat release groove B in the heat accumulating type SCR denitration and Dioxin removing system, firstly, the temperature of the waste gases in the heat release groove B is heated to 200-400 ℃ required by reaction by a heater in the heating chamberA, the high-temperature clean gas after the reaction treatment of the waste gas by the contact medium 1 (which can be nitrogen oxide (NOx) catalyst or dioxin contact medium or combination thereof) arranged in the heat release tank B and the heat storage tank C flows through the heat storage tank C through the connecting pipeline connecting the heat release tank B and the heat storage tank C and flows out of the system of the utility model after the heat energy is recovered (the flow direction is shown in figure 7 at the moment); when the temperature in the heat-releasing tank B for heating the waste gas is lower than a set value (at this time, the heater is in a closed state), the switch of the control damper switch is activated, and further the flowing direction is changed, so that the original heat-storing tank C is changed into a heat-releasing tank for heating the waste gas, and the original heat-releasing tank B is changed into a heat-storing tank for absorbing the high-temperature clean gas after the reaction treatment of the contact medium, and the clean gas flows through the original heat-releasing tank B via the connecting pipeline connecting the heat-releasing tank B and the heat-storing tank C and flows out of the system of the utility model after the heat energy is recovered by the original heat-releasing tank B (; therefore, the utility model discloses a heat recovery efficiency of whole equipment can reach about 90 ~ 95% to can be effectively utilized.
Claims (6)
1. A heat accumulating SCR denitration and dioxin removing equipment mainly comprises a heating chamber, a heat releasing tank and a heat accumulating tank, wherein the heat releasing tank and the heat accumulating tank are positioned at the lower part of the heating chamber for heating all or independently and are communicated through a connecting pipeline, and the equipment is characterized in that contact media capable of removing harmful ingredients in waste gas are respectively arranged in the heat releasing tank and the heat accumulating tank and below the connecting pipeline.
2. The heat accumulating type SCR denitration and dioxin removal apparatus as claimed in claim 1, wherein the catalyst on the surface of the catalyst is either a nitrogen oxide denitration catalyst or a dioxin catalyst or a catalyst of a combination thereof.
3. The heat accumulating type SCR denitration and dioxin removal apparatus according to claim 1 or 2, wherein the contact medium is either honeycomb type, flat plate type, wave type or particle type.
4. The heat accumulating type SCR denitration and dioxin removal apparatus as claimed in claim 1 or 2, wherein inner walls of the heat release tank and the heat accumulation tank are made of heat accumulating ceramics.
5. The heat accumulating type SCR denitration and dioxin removal apparatus according to claim 1 or 2, wherein the heat release grooves and the heat accumulation grooves are replaceable with each other according to a change in the flow direction of the exhaust gas, that is, the heat release grooves are changed to heat accumulation grooves, and the heat accumulation grooves are changed to heat release grooves.
6. The heat accumulating type SCR denitration and dioxin removal apparatus according to claim 5, wherein the flow direction of the exhaust gas is controlled by a corresponding exhaust damper switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420108611 CN2757903Y (en) | 2004-11-09 | 2004-11-09 | Heat storage type SCR denitrating and dioxime removing equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420108611 CN2757903Y (en) | 2004-11-09 | 2004-11-09 | Heat storage type SCR denitrating and dioxime removing equipment |
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| Publication Number | Publication Date |
|---|---|
| CN2757903Y true CN2757903Y (en) | 2006-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420108611 Expired - Lifetime CN2757903Y (en) | 2004-11-09 | 2004-11-09 | Heat storage type SCR denitrating and dioxime removing equipment |
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| Country | Link |
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| CN (1) | CN2757903Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102762275A (en) * | 2009-11-26 | 2012-10-31 | 化学热处理技术股份有限公司 | Process and apparatus for cleaning offgases by means of regenerative thermal postcombustion |
| CN105299687A (en) * | 2015-10-12 | 2016-02-03 | 国家电网公司 | Heat accumulating-type heat exchanger capable of removing dust and nitric oxide in smoke simultaneously |
| CN108057343A (en) * | 2016-11-07 | 2018-05-22 | 浙江奇彩环境科技股份有限公司 | A kind of heat accumulating type selective reduction denitration device and denitrating technique |
| FR3062071A1 (en) * | 2017-01-26 | 2018-07-27 | Chemisch Thermische Prozesstechnik Gmbh | METHOD AND DEVICE FOR THE PURIFICATION OF GASEOUS EFFLUENTS |
-
2004
- 2004-11-09 CN CN 200420108611 patent/CN2757903Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102762275A (en) * | 2009-11-26 | 2012-10-31 | 化学热处理技术股份有限公司 | Process and apparatus for cleaning offgases by means of regenerative thermal postcombustion |
| CN102762275B (en) * | 2009-11-26 | 2015-06-10 | 化学热处理技术股份有限公司 | Process and apparatus for cleaning offgases by means of regenerative thermal postcombustion |
| CN105299687A (en) * | 2015-10-12 | 2016-02-03 | 国家电网公司 | Heat accumulating-type heat exchanger capable of removing dust and nitric oxide in smoke simultaneously |
| CN108057343A (en) * | 2016-11-07 | 2018-05-22 | 浙江奇彩环境科技股份有限公司 | A kind of heat accumulating type selective reduction denitration device and denitrating technique |
| FR3062071A1 (en) * | 2017-01-26 | 2018-07-27 | Chemisch Thermische Prozesstechnik Gmbh | METHOD AND DEVICE FOR THE PURIFICATION OF GASEOUS EFFLUENTS |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20141109 Granted publication date: 20060215 |