CN212961538U - Efficient SCR system - Google Patents
Efficient SCR system Download PDFInfo
- Publication number
- CN212961538U CN212961538U CN202020914667.3U CN202020914667U CN212961538U CN 212961538 U CN212961538 U CN 212961538U CN 202020914667 U CN202020914667 U CN 202020914667U CN 212961538 U CN212961538 U CN 212961538U
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- Prior art keywords
- flue gas
- temperature
- boiler
- enters
- steam
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 73
- 239000003546 flue gas Substances 0.000 claims abstract description 73
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 13
- 239000000498 cooling water Substances 0.000 claims abstract description 4
- 239000010865 sewage Substances 0.000 abstract description 3
- 238000013461 design Methods 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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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 relates to a high-efficiency SCR system, which belongs to the technical field of flue gas treatment and particularly comprises a first superheater, a high-temperature economizer, a flue gas heater, an SCR device, a low-temperature economizer and an air preheater which are sequentially arranged on a flue of a boiler, high-temperature saturated steam generated by the boiler enters the flue gas heater, after heat exchange with the flue gas in the flue gas heater, the condensate water generated after heat exchange exchanges heat with the first superheater through the steam trap to generate superheated steam, excessive drain water in the steam trap enters the sewage discharge flash tank, cooling water of the low-temperature economizer enters the high-temperature economizer after heat exchange with the flue gas, carry out the heat exchange once more with the flue gas, the steam after the exchange gets into the boiler, and air admission air heater carries out the heat exchange with the flue gas, and the high temperature air of exchange gets into the boiler, the utility model discloses simple structure, reasonable in design can effectively improve SCR work efficiency.
Description
Technical Field
The utility model relates to a high-efficient SCR system belongs to flue gas processing technology field.
Background
Currently, NO produced by combustion in coal-fired boilersXThe SCR working temperature is typically 250-420 ℃, and the SCR working temperature is arranged before the air preheating period, after the coal economizer is partially or completely arranged so as to ensure that the flue gas temperature of the SCR at full load is between 250-420 ℃.
When the load is changed, the load is low or the fuel is changed, the flue gas temperature of the SCR is usually lower and is not in a high-efficiency range, and the method is generally adopted, namely 1) a high-temperature flue gas is introduced from a high-temperature flue gas area in front of an economizer, and the high-temperature flue gas flows through a heating surface between the SCR and the SCR after short circuit and is mixed with the flue gas at the inlet of the SCR, so that the mixed flue gas temperature is still in the high-efficiency working temperature range of the SCR, the method is mainly characterized in that the flow control of the high-temperature flue gas is performed, the flue gas temperature is generally about 500 ℃, and the flue gas controllability is poor at about 500 ℃, so; 2) a burner is arranged in a flue before SCR, high-temperature flue gas generated by gas or oil is mixed with the flue gas in the flue, and the temperature of the mixed flue gas is within the efficient working temperature range of the SCR; 3) the method has the advantages that the feed water temperature in the economizer is adjusted, the water temperature at the inlet of the economizer is increased under low load, the heat transfer temperature difference of the economizer is reduced, the heat absorption capacity of the flue gas before the SCR inlet is reduced, the flue gas temperature at the SCR inlet is increased to the high-efficiency working temperature range of the SCR as far as possible, and the improvement degree of the method on the flue gas is limited.
SUMMERY OF THE UTILITY MODEL
For solving the technical problem that prior art exists, the utility model provides a simple structure, reasonable in design can effectively improve SCR work efficiency's high-efficient SCR system.
In order to achieve the purpose, the technical scheme adopted by the utility model is a high-efficiency SCR system, which comprises a boiler, a first superheater, a high-temperature economizer, a flue gas heater, an SCR device, a low-temperature economizer and an air preheater, wherein the boiler is a direct current boiler, the flue of the boiler is sequentially provided with the first superheater, the high-temperature economizer, the flue gas heater, the SCR device, the low-temperature economizer and the air preheater, high-temperature saturated steam generated by the boiler enters the flue gas heater, after the high-temperature saturated steam exchanges heat with flue gas in the flue gas heater, low-temperature water generated after the heat exchange exchanges heat with the first superheater through a steam trap to generate superheated steam, excessive drain water in the steam trap enters a sewage discharge capacity expander, cooling water of the low-temperature economizer enters the high-temperature economizer after the heat exchange with the flue gas, the low-temperature water exchanges heat with the flue gas again, and the exchanged water enters the boiler, air enters the air preheater to exchange heat with the flue gas, and the exchanged high-temperature air enters the boiler.
Preferably, the system also comprises a second superheater, the second superheater is arranged between the first superheater and the high-temperature economizer, high-temperature saturated steam generated by the boiler enters the second superheater for heating to form superheated steam, and the superheated steam enters the flue gas heater for heat exchange with flue gas.
Preferably, the boiler is a drum furnace, high-temperature steam generated by the high-temperature flue gas enters the drum, one part of the high-temperature steam in the drum enters the boiler, the other part of the high-temperature steam enters the second superheater, the second superheater heats the high-temperature steam to form superheated steam, and the superheated steam enters the flue gas heater to exchange heat with the flue gas.
Compared with the prior art, the utility model discloses following technological effect has: the utility model adopts the flue gas heater, and utilizes the saturated steam or the superheated steam to exchange heat with the flue gas in the strengthening heater, so that the temperature of the flue gas can rapidly reach the high-efficiency working temperature of the SCR, and the working efficiency of the SCR is improved; meanwhile, under low load, the heat transfer temperature difference is large, so that the temperature of the flue gas at the outlet of the flue gas heater is higher than the corresponding saturation temperature or boiling temperature, and the temperature is 255-420 ℃, thereby meeting the normal operation of SCR; and the problem that the temperature of the steam drum furnace is low at low load can be solved, and under low load, the steam flow in the superheater is reduced due to the fact that the flue gas heater condenses steam, the steam temperature is improved, and the steam temperature under low load can reach a set value more easily.
Drawings
Fig. 1 is a schematic structural diagram of the direct current furnace of the present invention when heating with saturated steam.
Fig. 2 is a schematic structural view of the direct current furnace of the present invention when heating with superheated steam.
Fig. 3 is a schematic structural view of the drum furnace of the present invention when it is heated by superheated steam.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, a high-efficiency SCR system, which heats flue gas by using saturated steam, specifically comprises a boiler 1, a first superheater 2, a high-temperature economizer 3, a flue gas heater 4, an SCR device 5, a low-temperature economizer 6 and an air preheater 7, wherein the boiler 1 is a once-through boiler, the flue of the boiler 1 is sequentially provided with the first superheater 2, the high-temperature economizer 3, the flue gas heater 4, the SCR device 5, the low-temperature economizer 6 and the air preheater 7, high-temperature saturated steam generated by the boiler 1 enters the flue gas heater 4, after heat exchange with flue gas in the flue gas heater 4, low-temperature water generated after heat exchange exchanges heat with the first superheater 2 through a steam trap 8 to generate superheated steam, excessive hydrophobic water in the steam trap 8 enters a sewage discharge capacity expander, cooling water of the low-temperature economizer 6 exchanges heat with flue gas to form low-temperature steam, and the low-temperature steam enters the high-temperature economizer 3, and carrying out heat exchange with the flue gas again to form high-temperature steam, introducing the exchanged high-temperature water into the boiler 1, introducing air into the air preheater 7 to carry out heat exchange with the flue gas, and introducing the exchanged high-temperature air into the boiler 1.
As shown in fig. 2, a high-efficiency SCR system heats flue gas by using superheated steam, which mainly adds a second superheater 9 compared with a system using saturated steam, the second superheater 9 is installed between a first superheater 2 and a high-temperature economizer 3, high-temperature saturated steam generated by a boiler 1 enters the second superheater 9 to be heated, superheated steam is formed, and the superheated steam enters a flue gas heater 4 to exchange heat with the flue gas.
As shown in fig. 3, a high-efficient SCR system mainly utilizes superheated steam to heat flue gas for a drum boiler, and mainly adds a second superheater 9 in comparison with a system utilizing saturated steam, the boiler is a drum boiler, high-temperature steam generated by high-temperature flue gas enters a drum 10, a part of the high-temperature steam in the drum 10 enters the boiler 1, the other part of the high-temperature steam enters the second superheater 9, the second superheater 9 heats the high-temperature steam to form superheated steam, and the superheated steam enters a flue gas heater 4 to exchange heat with the flue gas.
The foregoing is considered as illustrative and not restrictive of the preferred embodiments of the invention, and any modifications, equivalents and improvements made within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (3)
1. The utility model provides a high-efficient SCR system, includes boiler, first over heater, high temperature economizer, flue gas heater, SCR device, low temperature economizer and air heater, its characterized in that: the boiler is a direct-current boiler, a first superheater, a high-temperature economizer, a flue gas heater, an SCR device, a low-temperature economizer and an air preheater are sequentially installed on a flue of the boiler, high-temperature saturated steam generated by the boiler enters the flue gas heater to exchange heat with flue gas in the flue gas heater, low-temperature water generated after heat exchange exchanges heat with the first superheater through a steam trap to generate superheated steam, excessive drain water in the steam trap enters a pollution discharge capacity expander, cooling water of the low-temperature economizer enters the high-temperature economizer after exchanging heat with the flue gas to exchange heat with the flue gas again, the exchanged water enters the boiler, air enters the air preheater to exchange heat with the flue gas, and the exchanged high-temperature air enters the boiler.
2. A high efficiency SCR system as defined in claim 1, wherein: the high-temperature saturated steam generated by the boiler enters the second superheater to be heated to form superheated steam, and the superheated steam enters the flue gas heater to exchange heat with flue gas.
3. A high efficiency SCR system as defined in claim 1, wherein: the boiler is a drum furnace, high-temperature steam generated by high-temperature flue gas enters the drum, one part of the high-temperature steam in the drum enters the boiler, the other part of the high-temperature steam enters the second superheater, the second superheater heats the high-temperature steam to form superheated steam, and the superheated steam enters the flue gas heater to exchange heat with the flue gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020914667.3U CN212961538U (en) | 2020-05-27 | 2020-05-27 | Efficient SCR system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020914667.3U CN212961538U (en) | 2020-05-27 | 2020-05-27 | Efficient SCR system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212961538U true CN212961538U (en) | 2021-04-13 |
Family
ID=75376038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020914667.3U Expired - Fee Related CN212961538U (en) | 2020-05-27 | 2020-05-27 | Efficient SCR system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212961538U (en) |
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2020
- 2020-05-27 CN CN202020914667.3U patent/CN212961538U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210413 |