CN203364109U - SCR temperature regulating system of boiler - Google Patents
SCR temperature regulating system of boiler Download PDFInfo
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- CN203364109U CN203364109U CN 201320303804 CN201320303804U CN203364109U CN 203364109 U CN203364109 U CN 203364109U CN 201320303804 CN201320303804 CN 201320303804 CN 201320303804 U CN201320303804 U CN 201320303804U CN 203364109 U CN203364109 U CN 203364109U
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- 230000001105 regulatory effect Effects 0.000 title claims abstract description 29
- 238000010521 absorption reaction Methods 0.000 claims description 40
- 235000019504 cigarettes Nutrition 0.000 claims description 35
- 238000012544 monitoring process Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 8
- 239000012530 fluid Substances 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 239000003054 catalyst Substances 0.000 abstract description 23
- 239000003245 coal Substances 0.000 abstract description 12
- 230000009466 transformation Effects 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 3
- 239000003517 fume Substances 0.000 abstract 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 16
- 239000003546 flue gas Substances 0.000 description 16
- 238000010438 heat treatment Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- WWILHZQYNPQALT-UHFFFAOYSA-N 2-methyl-2-morpholin-4-ylpropanal Chemical compound O=CC(C)(C)N1CCOCC1 WWILHZQYNPQALT-UHFFFAOYSA-N 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 210000004400 mucous membrane Anatomy 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
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Abstract
The utility model discloses an SCR temperature regulating system of a boiler. The SCR temperature regulating system comprises a coal economizer, the coal economizer comprises a coal economizer outlet collecting box and a coal economizer inlet collecting box, the coal economizer outlet collecting box is communicated with the boiler, and the coal economizer inlet collecting box is communicated with the coal economizer; the coal economizer inlet collecting box is connected with a boiler water feed pipe, and the boiler water feed pipe or the coal economizer inlet collecting box is communicated with a temperature regulating device regulating the flow of heat absorbing working media of the boiler water feed pipe. According to the SCR temperature regulating system, the fume temperature can be controlled within a temperature range in which catalysts can work normally, and activity of the catalysts is guaranteed. In addition, according to the SCR temperature regulating system, the temperature regulating device is additionally arranged outside the coal economizer, internal components of existing equipment of a boiler system do not need to be transformed, transformation difficulty reduction is facilitated, and transformation cost is reduced.
Description
Technical field
The utility model relates to the thermal power generation field, in particular, relates to a kind of SCR thermoregulating system of boiler.
Background technology
General boiler is in running, boiler at full capacity under operating mode the Temperature of Working of heating surface change and the flue-gas temperature of each heating surface can meet design requirement, if but, under the operating mode of boiler at low load, the flue-gas temperature at boiler heating surface place can not have been mated with design temperature.According to field adjustable operating experience summary for many years, general boiler boiler economizer exit cigarette temperature under running on the lower load is much lower under operating mode more at full capacity, the coal-fired unit of the 300MW that gives an example, at full capacity under operating mode boiler economizer exit cigarette temperature generally at the 350-400 degree, and economizer exit cigarette temperature less than 300 degree under boiler band 30% load condition.For the China Power situation, the frequent underrun of unit, underrun is that working medium or flue-gas temperature all depart from the boiler design requirement, has a strong impact on boiler service life.
Appearance along with national denitration policy, coal-burning boiler all must carry out the denitration transformation, the denitration transformation has two kinds of modes, the one, the denitration in the stove another kind is that denitrating flue gas is SCR (full name: Selective Catalytic Reduction, Chinese: selective catalytic reduction) denitration, guarantee that amount of nitrogen oxides is lower than national standard, pulverized-coal fired boiler must carry out the SCR transformation, in the SCR transformation, catalyst is that key is also main consumables, will guarantee denitration of boiler smoke efficiency, the reasonable utilization of SCR catalyst is most important for this reason.
The domestic market denitrating catalyst is mostly high temperature catalyst, and its reasonable temperature is the 350-400 degree, if flue-gas temperature reduces greatly lower than 300 degree catalyst activities, causes denitration efficiency to descend and can not meet environmental requirement; SO when the cigarette temperature is spent lower than 300 simultaneously in flue gas
3easily with flue gas in ammonia generation chemical reaction generate ammonium hydrogen sulfate, ammonium hydrogen sulfate presents the mucous membrane shape in 250 degree left and right and easily sticks to catalyst surface, causes catalyst activity to reduce even inefficacy.For high temperature catalyst, keep reasonable cigarette temperature extremely important for this reason, for the frequent underrun of state's Internal-combustion engine using coal group, the SCR inlet flue gas temperature can not meet the catalyst service requirement, at present a lot of power plant must also carry out corresponding transformation to economizer surface when carrying out the SCR transformation, area by economizer surface before minimizing SCR entrance, increase the part economizer surface in the SCR back simultaneously, its purpose is exactly mainly to prevent from that cigarette temperature before the boiler at low load economizer exit SCR entrance in when operation is too low to cause catalyst activity to reduce or inefficacy, but for boiler high load capacity operating mode, before economizer exit SCR entrance, the cigarette temperature is too high can have certain influence to catalyst activity equally, and larger to heating surface investment for trnasforming urban land expense.
The utility model content
Technical problem to be solved in the utility model is to provide a kind of low cost, can keeps the SCR thermoregulating system of the boiler of catalyst activity.
The purpose of this utility model is achieved through the following technical solutions:
A kind of SCR thermoregulating system of boiler, comprise economizer, and described economizer comprises the economizer exit header be communicated with boiler, the economizer entrance header be communicated with economizer; Described economizer entrance header is connected with boiler feed pipe, and described boiler feed pipe or economizer entrance header are communicated with the register of regulating boiler feed pipe heat absorption working medium flow.
Further, described register comprises the adjusting pipeline, for measuring the cigarette temperature monitoring modular of the front cigarette temperature of SCR device portal, control module with the coupling of cigarette temperature monitoring modular, the heat absorption working medium input of described adjusting pipeline is communicated with described boiler feed pipe or economizer entrance header, regulates in pipeline and is serially connected with control valve; Described control valve controls to adjust the flow of heat absorption working medium in pipeline by control module.
Further, described adjusting pipeline also is serially connected with the stop valve of regulating pipeline heat absorption Working fluid flow for turn-offing.
Further, described adjusting pipeline also is serially connected with to the booster pump of regulating heat absorption working medium increase kinetic energy in pipeline.
Further, described adjusting pipeline also is serially connected with the stop valve of regulating pipeline heat absorption Working fluid flow for turn-offing, and gives and regulate in pipeline the booster pump that the working medium of absorbing heat increases kinetic energy.
Further, the heat absorption working medium output of described adjusting pipeline is communicated to described economizer exit header.
Further, described boiler is non-natural circulation boiler, and the heat absorption working medium output of described adjusting pipeline is communicated to the common downcomer of described boiler.
Further, described boiler is non-natural circulation boiler, and the heat absorption working medium output of described adjusting pipeline is communicated to the water-cooling wall lower header of described boiler.
Further, described boiler is natural circulation boiler, and the heat absorption working medium output of described adjusting pipeline is communicated to common downcomer or the water-cooling wall lower header of described boiler; The flow of described adjusting pipeline is no more than 30t/h.
After deliberation, the heat absorption working medium flow in economizer is relevant with the flue-gas temperature (cigarette temperature) outside economizer, increases the heat absorption working medium flow, and the outer cigarette temperature of economizer will reduce, and on the contrary, the outer cigarette temperature of economizer will raise.The utility model is regulated the register of boiler feed pipe heat absorption working medium flow because boiler feed pipe or economizer entrance header are communicated with, cigarette temperature before register Real-Time Monitoring SCR device portal, when described cigarette temperature schedules preset value, reduce boiler feed pipe and enter the flow of the heat absorption working medium of economizer entrance header, along with the cigarette temperature is gone up gradually, then increase gradually the flow of heat absorption working medium.The temperature range that so just fibre selection can be able to be worked at catalyst, ensured the activity of catalyst.In addition, the utility model only need to additionally increase register in the outside of economizer, without the internals of transformation steam generator system existing equipment, is conducive to reduce the transformation difficulty, reduces improvement cost.
The accompanying drawing explanation
Fig. 1 is the schematic diagram of the SCR thermoregulating system of the utility model embodiment the first boiler;
Fig. 2 is the schematic diagram of the SCR thermoregulating system of the utility model embodiment the second boiler;
Fig. 3 is the schematic diagram of the SCR thermoregulating system of the third boiler of the utility model embodiment.
Wherein: 10, economizer; 11, economizer exit header; 12, economizer entrance header; 13, economizer surface; 20, register; 21, control module; 22, control valve; 23, stop valve; 24, booster pump; 25, regulate pipeline; 26, cigarette temperature monitoring modular; 30, SCR device; 40, common downcomer; 50, water-cooling wall lower header; 60, boiler feed pipe.
The specific embodiment
A kind of method that the utility model discloses steam generator system and regulates boiler SCR inlet flue gas temperature.The SCR thermoregulating system of boiler comprises economizer, and described economizer comprises the economizer exit header be communicated with boiler, the economizer entrance header be communicated with economizer; Described economizer entrance header is connected with boiler feed pipe, and described boiler feed pipe or economizer entrance header are communicated with the register of regulating boiler feed pipe heat absorption working medium flow.
The method of the adjusting boiler SCR inlet flue gas temperature of steam generator system described in the utility model comprises step: cigarette temperature before monitoring SCR device portal, when described cigarette temperature schedules preset value, reduce boiler feed pipe and enter the flow of the heat absorption working medium of economizer entrance header.
Preset value is determined according to the temperature requirement that keeps catalyst activity, is generally selected between 300 ℃～400 ℃; Between preferably 350 ℃～400 ℃.
After deliberation, the heat absorption working medium flow in economizer is relevant with the flue-gas temperature (cigarette temperature) outside economizer, increases the heat absorption working medium flow, and the outer cigarette temperature of economizer will reduce, and on the contrary, the outer cigarette temperature of economizer will raise.The utility model is regulated the register of boiler feed pipe heat absorption working medium flow because boiler feed pipe or economizer entrance header are communicated with, cigarette temperature before register Real-Time Monitoring SCR device portal, when described cigarette temperature schedules preset value, reduce boiler feed pipe and enter the flow of the heat absorption working medium of economizer entrance header, along with the cigarette temperature is gone up gradually, then increase gradually the flow of heat absorption working medium.The temperature range that so just fibre selection can be able to be worked at catalyst, ensured the activity of catalyst.In addition, the utility model only need to additionally increase register in the outside of economizer, without the internals of transformation steam generator system existing equipment, is conducive to reduce the transformation difficulty, reduces improvement cost.
Below in conjunction with accompanying drawing and preferred embodiment, the utility model is described in further detail.
As shown in Figures 1 to 3, the SCR thermoregulating system of the boiler of present embodiment comprises economizer 10, and described economizer 10 comprises the economizer exit header 11 be communicated with the boiler (not shown), the economizer entrance header 12 be communicated with economizer 10; Between economizer exit header 11 and economizer entrance header 12, by economizer surface 13, be communicated with.Described economizer entrance header 12 is connected with boiler feed pipe 60, and described boiler feed pipe 60 or economizer entrance header 12 are communicated with the register 20 of regulating boiler feed pipe 60 heat absorption working medium flows.
Described register 20 comprises regulates pipeline 25, for measuring the cigarette temperature monitoring modular 26 of the front cigarette temperature of SCR device 30 entrances, control module 21 with 26 couplings of cigarette temperature monitoring modular, the heat absorption working medium input of described adjusting pipeline 25 is communicated with described boiler feed pipe 60 or economizer entrance header 12, regulates in pipeline 25 and is serially connected with control valve 22; Described control valve 22 is by the flow of heat absorption working medium in control module 21 control and regulation pipelines 25.
Described adjusting pipeline 25 also is serially connected with the stop valve 23 of regulating pipeline 25 heat absorption Working fluid flows for turn-offing, and gives and regulate in pipeline 25 booster pump 24 that the working medium of absorbing heat increases kinetic energy.
The heat absorption working medium output of regulating pipeline 25 can be communicated to according to dissimilar boiler different parts.
1, for all coal-burning boilers, all can be on boiler feed pipe 60 tunnels (or economizer entrance header 12) and set up this register 20, the heat absorption working medium output of regulating pipeline 25 is communicated to economizer exit header 11 (as shown in Figure 1), according to the pipe resistance factor, can consider regulating increase by one booster pump 24 on pipeline 25, control module 21 is according to the control valve 22 on cigarette temperature automatic control and adjustment pipeline 25 before the SCR entrance, until the SCR inlet flue gas temperature meets the catalyst service requirement.
2, for non-natural circulation boiler, can between the common downcomer 40 of boiler feed pipe 60 tunnels (or economizer entrance header 12) and boiler, design this register 20, the heat absorption working medium output of regulating pipeline 25 is communicated to the common downcomer 40 (as shown in Figure 2) of described boiler, according to the pipe resistance factor, can consider regulating increase by one booster pump 24 on pipeline 25, control module 21 is according to the control valve 22 on cigarette temperature automatic control and adjustment pipeline 25 before the SCR entrance, until the SCR inlet flue gas temperature meets the catalyst service requirement.
3, for non-natural circulation boiler, can between the water-cooling wall lower header 50 of boiler feed pipe 60 tunnels (or economizer entrance header 12) and boiler, design this register 20, the heat absorption working medium output of regulating pipeline 25 is communicated to the water-cooling wall lower header 50 (as shown in Figure 3) of described boiler, according to the pipe resistance factor, can consider regulating increase by one booster pump 24 on pipeline 25, control module 21 is according to the control valve 22 on cigarette temperature automatic control and adjustment pipeline 25 before the SCR entrance, until the SCR inlet flue gas temperature meets the catalyst service requirement.
4, for natural circulation boiler, can be between the common downcomer 40 of boiler feed pipe 60 tunnels (or economizer entrance header 12) and boiler or water-cooling wall lower header 50 design this register 20 (referring to Fig. 2,3), according to the pipe resistance factor, can consider regulating increase by one booster pump 24 on pipeline 25, control module 21 is according to the control valve 22 on cigarette temperature automatic control and adjustment pipeline 25 before the SCR entrance, until the SCR inlet flue gas temperature meets the catalyst service requirement, but control system restriction bypass flow must not be higher than 30t/h.
Above content is in conjunction with concrete preferred embodiment further detailed description of the utility model, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, without departing from the concept of the premise utility, can also make some simple deduction or replace, all should be considered as belonging to protection domain of the present utility model.
Claims (9)
1. the SCR thermoregulating system of a boiler, comprise economizer, and described economizer comprises the economizer exit header be communicated with boiler, the economizer entrance header be communicated with economizer; It is characterized in that, described economizer entrance header is connected with boiler feed pipe, and described boiler feed pipe or economizer entrance header are communicated with the register of regulating boiler feed pipe heat absorption working medium flow.
2. the SCR thermoregulating system of boiler as claimed in claim 1, it is characterized in that, described register comprises the adjusting pipeline, for measuring the cigarette temperature monitoring modular of the front cigarette temperature of SCR device portal, control module with the coupling of cigarette temperature monitoring modular, the heat absorption working medium input of described adjusting pipeline is communicated with described boiler feed pipe or economizer entrance header, regulates in pipeline and is serially connected with control valve; Described control valve controls to adjust the flow of heat absorption working medium in pipeline by control module.
3. the SCR thermoregulating system of boiler as claimed in claim 2, is characterized in that, described adjusting pipeline also is serially connected with the stop valve of regulating pipeline heat absorption Working fluid flow for turn-offing.
4. the SCR thermoregulating system of boiler as claimed in claim 2, is characterized in that, described adjusting pipeline also is serially connected with to the booster pump of regulating heat absorption working medium increase kinetic energy in pipeline.
5. the SCR thermoregulating system of boiler as claimed in claim 2, is characterized in that, described adjusting pipeline also is serially connected with the stop valve of regulating pipeline heat absorption Working fluid flow for turn-offing, and give and regulate in pipeline the booster pump that the working medium of absorbing heat increases kinetic energy.
6. as the SCR thermoregulating system of the described boiler of claim 2～5, it is characterized in that, the heat absorption working medium output of described adjusting pipeline is communicated to described economizer exit header.
7. as the SCR thermoregulating system of the described boiler of claim 2～5, it is characterized in that, described boiler is non-natural circulation boiler, and the heat absorption working medium output of described adjusting pipeline is communicated to the common downcomer of described boiler.
8. as the SCR thermoregulating system of the described boiler of claim 2～5, it is characterized in that, described boiler is non-natural circulation boiler, and the heat absorption working medium output of described adjusting pipeline is communicated to the water-cooling wall lower header of described boiler.
9. as the SCR thermoregulating system of the described boiler of claim 2～5, it is characterized in that, described boiler is natural circulation boiler, and the heat absorption working medium output of described adjusting pipeline is communicated to common downcomer or the water-cooling wall lower header of described boiler; The flow of described adjusting pipeline is no more than 30t/h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320303804 CN203364109U (en) | 2013-05-30 | 2013-05-30 | SCR temperature regulating system of boiler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320303804 CN203364109U (en) | 2013-05-30 | 2013-05-30 | SCR temperature regulating system of boiler |
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| CN203364109U true CN203364109U (en) | 2013-12-25 |
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| CN 201320303804 Expired - Lifetime CN203364109U (en) | 2013-05-30 | 2013-05-30 | SCR temperature regulating system of boiler |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103277788A (en) * | 2013-05-30 | 2013-09-04 | 万平 | SCR temperature regulating system of boiler and method for regulating smoke temperature of SCR inlet of boiler |
| CN104406155A (en) * | 2014-11-27 | 2015-03-11 | 哈尔滨锅炉厂有限责任公司 | Connecting pipe for improving water temperature of coal economizer |
| CN103836607B (en) * | 2014-03-05 | 2015-12-09 | 华电电力科学研究院 | Thermal power plant's SCR denitration reactor working temperature controller and control method thereof |
| CN107036069A (en) * | 2017-05-18 | 2017-08-11 | 杭州江东富丽达热电有限公司 | Boiler steam and water circuit |
| CN107270383A (en) * | 2017-07-06 | 2017-10-20 | 国网山东省电力公司电力科学研究院 | A thermal power unit peak regulation heating system |
-
2013
- 2013-05-30 CN CN 201320303804 patent/CN203364109U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103277788A (en) * | 2013-05-30 | 2013-09-04 | 万平 | SCR temperature regulating system of boiler and method for regulating smoke temperature of SCR inlet of boiler |
| CN103836607B (en) * | 2014-03-05 | 2015-12-09 | 华电电力科学研究院 | Thermal power plant's SCR denitration reactor working temperature controller and control method thereof |
| CN104406155A (en) * | 2014-11-27 | 2015-03-11 | 哈尔滨锅炉厂有限责任公司 | Connecting pipe for improving water temperature of coal economizer |
| CN107036069A (en) * | 2017-05-18 | 2017-08-11 | 杭州江东富丽达热电有限公司 | Boiler steam and water circuit |
| CN107270383A (en) * | 2017-07-06 | 2017-10-20 | 国网山东省电力公司电力科学研究院 | A thermal power unit peak regulation heating system |
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| CX01 | Expiry of patent term |
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