CN203517748U - Temperature controllable coal economizer - Google Patents
Temperature controllable coal economizer Download PDFInfo
- Publication number
- CN203517748U CN203517748U CN201320642297.2U CN201320642297U CN203517748U CN 203517748 U CN203517748 U CN 203517748U CN 201320642297 U CN201320642297 U CN 201320642297U CN 203517748 U CN203517748 U CN 203517748U
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- economizer
- control valve
- electric control
- scr
- boiler
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- 239000003245 coal Substances 0.000 title abstract description 14
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000003546 flue gas Substances 0.000 claims abstract description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 238000009529 body temperature measurement Methods 0.000 claims description 8
- 230000008676 import Effects 0.000 claims description 7
- 239000003054 catalyst Substances 0.000 abstract description 12
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- 239000000779 smoke Substances 0.000 abstract description 6
- 238000010531 catalytic reduction reaction Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 18
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 16
- 235000019504 cigarettes Nutrition 0.000 description 11
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 10
- 238000000034 method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000006722 reduction reaction Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000009841 combustion method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The utility model discloses a temperature controllable coal economizer. The coal economizer comprises an economizer body arranged on a tail flue, a selective catalytic reduction (SCR) unit, an economizer outlet header, an economizer inlet header and an economizer water supply pipe. The economizer water supply pipe is connected with the economizer inlet header through connection pipes, and first electric adjusting valves are arranged on the connection pipe. An economizer water supply bypass pipe is connected between the economizer water supply pipe and the economizer outlet header, and a second electric adjusting valve for controlling the water volume is arranged on the bypass pipe, so that the water volume passing through the economizer can be adjusted. By means of the coal economizer, flue gas temperatures in the SCR unit all meet the optimum reaction temperature required by catalysts. A flue gas temperature measuring unit is arranged at the position of an SCR unit inlet, and feedback automatic control units are arranged between the smoke temperature measuring unit and the first electric adjusting valves and the second electric adjusting valve. The coal economizer can be introduced into a boiler DCS control system, and operators can perform operation control in a central control room conveniently.
Description
Technical field
The utility model belongs to boiler economizer technical field, relates in particular to a kind of economizer using with the CFBB of SCR Benitration reactor.
Background technology
China is one and take the country that coal is main energy sources, and coal accounts for 75% in primary energy, wherein more than 84% by combustion method, utilizes, and coal combustion discharges the nitrogen oxide (NOx) in waste gas, is one of main source of atmospheric pollution.According to the < < fossil-fuel power plant atmospheric pollutant emission standard > > regulation of issuing and implementation on January 1st, 2012, the nitrogen oxide of coal-burning boiler (in NOx) concentration of emission will reach 100mg/m
3below.In order to ensure the discharge index of final NOx, when adopting low NOx combustion equipment, denitration device has become one of standard configuration of boiler from now on.Selective catalytic reduction (Selective Catalytic Reduction, SCR) be that to remove in boiler exhaust gas the most common while of nitrogen oxide be also effective method the most, have that denitration efficiency is high, the selective advantage such as good, stable and reliable operation, be widely used in each commercial plant.Its technological principle is to adopt ammonia as reducing agent, after being mixed with air, it sprays in the flue of SCR Benitration reactor upstream, under the effect of catalyst, react the harmless nitrogen G&W discharge of generation with the nitrogen oxide in flue gas, reach the object of NO_x removal.
Because SCR adopts the restriction of catalyst self character, SCR denitrating technique has specific requirement to reaction temperature window, and the active temperature interval of denitration roughly, between 300～420 ℃, just can reach the national standard of discharged nitrous oxides.And flue gas is controlled at 320 ℃ of left and right, can reach the standard of discharged nitrous oxides, can make again denitrating catalyst consumption minimum.Adopt of existing SCR flue-gas denitration process is arranged in SCR reactor between boiler economizer and air preheater more, the flue gas of drawing from boiler economizer enters air preheater after SCR reactor, and this mode is the most common arrangement in station boiler.Comprise back-end ductwork, be furnished with other heating surfaces, economizer, SCR equipment and air preheater on back-end ductwork, back-end ductwork is U type or the type of falling U in whole or in part; Flue gas after power boiler burning, after other heating surfaces through boiler body, first passes through economizer, then by the flue being connected with SCR equipment, enters SCR equipment, and then flue gas enters air preheater through air preheater gas approach.Economizer is as the final stage heating surface of boiler, and its outlet cigarette temperature has remarkable impact to denitrification apparatus inlet flue gas temperature, and for most of boiler type, denitrification apparatus inlet flue gas temperature is boiler economizer outlet cigarette temperature.
China is as big coal country, and the ature of coal of different regions differs greatly, even areal, the coal-fired ature of coal of Coal rank also has very large difference.Power plant is in order to reach the requirement of caloric value and cost-saving, and what adopt mostly is mixing coal, and ature of coal alters a great deal; Caused thus the complicated and changeable of exhaust gas temperature, the variation of boiler live load also can make boiler export cigarette temperature change in addition, reason due to design or operation, the outlet cigarette temperature of part boiler under running on the lower load cannot meet the service requirement of denitrification apparatus, cause denitration effect poor, denitrating catalyst consumption is large, and fume emission is difficult to be up to state standards.
Economizer is as heat-exchanger rig, the high-temperature flue gas of economizer outside of flowing through is heat release medium, the low temperature feedwater of economizer inside of flowing through is heat-absorbing medium, and in the situation that other conditions are certain, the flue-gas temperature at economizer exit place is subject to economizer to change amount of heat to be affected obviously.If improve the boiler export cigarette temperature under boiler at low load operating mode, reduce economizer surface, will make the also unnecessary increase of the outlet cigarette temperature of boiler under high load capacity operating mode, and then increased boiler exhaust gas heat loss, reduced boiler efficiency, and the boiler most of the time all operates in high-load range, the method that therefore improves economizer exit cigarette temperature by reducing economizer surface is can not be received.
At present, generally by economizer gas bypass is set, solve the problems referred to above, the outlet of gas bypass is positioned on boiler export flue, on gas bypass and boiler export flue, gas proportioning damper is all set, in order to regulate the exhaust gas volumn of passing through in flue separately.When boiler export cigarette temperature is greater than 320 ℃, the baffle plate complete shut-down on gas bypass and baffle plate standard-sized sheet on boiler export flue makes flue gas all pass through economizer surface heat release, reduces heat loss due to exhaust gas, improves boiler efficiency.At boiler at low load or because of other reasons boiler export flue-gas temperature during lower than 320 ℃, the baffle plate on gas bypass is reached to correct position, part of smoke is mixed with the partial fume through economizer after adiabatic gas bypass mutually without the economizer surface of heat absorption.The part high-temperature flue gas of process economizer surface is not because there is no heat release, its temperature does not reduce, the caloric receptivity of economizer reduces, so just can improve the mixed flue gas temperature after economizer, thereby improve boiler export cigarette temperature, make the flue-gas temperature that enters denitrification apparatus be greater than 320 ℃, meet the requirement of denitrating catalyst.
But there is following shortcoming in gas bypass system: 1,, for guaranteeing the uniformity of smoke distribution, the width of bypass flue is suitable with boiler furnace width, takes up room larger, and the actual arrangement of gas bypass flue is very difficult; 2, gas baffle adjusting function is poor; The yielding bite of long-term operation backboard, causes and regulates difficulty, is even not closed completely and smoke spillage occurs, the exhaust gas temperature while affect boiler high load capacity, reduction boiler efficiency; 3, bypass flue weight is larger, causes the cost of investment of armamentarium larger.
Summary of the invention
The purpose of this utility model is that the temperature before denitration of boiler smoke is regulated and controled, allow cigarette temperature reach best denitration temperature and to keep, make denitrating catalyst activity remain on high state always, promote the service life of denitration effect and extending catalyst, the consumption of minimizing denitrating catalyst, make emission of smoke tallies national standard.
The technical scheme that the utility model adopted is for achieving the above object:
A kind of controlled warm type economizer, comprise back-end ductwork and be arranged in economizer, the SCR equipment on back-end ductwork, also comprise economizer exit header, economizer import header and economizer feed pipe, economizer feed pipe is connected with economizer import header by tube connector, it is characterized in that: described tube connector is provided with the first electric control valve; Between economizer feed pipe and economizer exit header, be also connected with economizer feed water by-pass pipeline.
For convenient, control, described economizer feed water by-pass pipeline is provided with the second electric control valve of the regulation and control water yield, described SCR equipment entrance place is provided with flue gas temperature measurement device, between flue gas temperature measurement device and the first electric control valve, the second electric control valve, is provided with feedback controls device.
As a kind of optimal way, described flue gas temperature measurement device is thermocouple.
This feed water by-pass pipeline is provided with the second electric control valve of the regulation and control water yield, can regulate the water yield by economizer, by which, guarantee the temperature range of in boiler full load SCR reaction, guarantee that the design of air preheater and exhaust gas temperature are in rational level simultaneously.
The utility model is provided with vertical economizer feed water by-pass pipeline between economizer feed pipe and economizer exit header, this feed water by-pass pipeline is provided with the second electric control valve of the regulation and control water yield, can regulate the water yield by economizer, pass through which, guarantee that the flue-gas temperature that enters SCR equipment all reaches the optimal reaction temperature that catalyst requires under all loads, guarantee that the flue-gas temperature that enters air preheater, at its zone of reasonableness, does not increase the difficulty of air preheater design and the flue gas loss of boiler yet simultaneously.
Compared with prior art, the utility model possesses following advantage:
1, economizer feed water by-pass pipe-line system is simple in structure, line size is little, is easy to arrange and install;
2, the economizer bypass water yield is controlled by control valve, and adjusting function is good, convenient and reliable, and during boiler heavy-duty service, temperature can not raise, and boiler efficiency can not reduce;
3, water bypass duct system architecture is simple, and equipment dependability is high, and operation maintenance workload is little;
4, reduce equipment investment expense.
Accompanying drawing explanation
Fig. 1 is that the master of the controlled warm type economizer of the utility model looks schematic diagram.
Fig. 2 is that schematic diagram is looked on the right side of the controlled warm type economizer of the utility model.
In figure: 1-economizer exit header, 2-economizer, 3-bypass duct, 4-the first electric control valve, 5-economizer import header, 6-tube connector, 7-economizer feed pipe, 8-the second electric control valve.
The specific embodiment
Below by non-limiting embodiment, also by reference to the accompanying drawings the utility model is described further.
As shown in Figure 1 and Figure 2, a kind of controlled warm type economizer, comprise back-end ductwork and be arranged in economizer 2, the SCR equipment on back-end ductwork, also comprise economizer exit header 1, economizer import header 5 and economizer feed pipe 7, economizer feed pipe 7 is connected with economizer import header 5 by tube connector 6, and tube connector 6 is provided with the first electric control valve 4; Between economizer feed pipe 7 and economizer exit header 5, be also connected with economizer feed water by-pass pipeline 3.Economizer feed water by-pass pipeline 3 is provided with the second electric control valve 8 of the regulation and control water yield, and described SCR equipment entrance place is provided with flue gas temperature measurement thermocouple, between thermocouple and the first electric control valve 4, the second electric control valve 8, is provided with feedback controls device.
The operation principle of the present embodiment is as follows:
SCR equipment entrance place is provided with flue gas temperature measurement thermocouple, between thermocouple and the first electric control valve, the second electric control valve, is provided with feedback device.In the situation that not needing to carry out temperature adjustment, the second electric control valve 8 on economizer feed water by-pass pipeline 3 cuts out, and in economizer feed water by-pass pipeline 3, does not have water at low temperature to pass through; In the time of need to carrying out temperature adjusting, can be by opening the second electric control valve 8 on economizer feed water by-pass pipeline 3, the low temperature discharge reduction that makes to flow through in economizer, improve the flue-gas temperature at economizer exit place, the aperture of the second electric control valve 8 on economizer feed water by-pass pipeline 3 is larger, and the speed of intensification is faster.Because the second electric control valve 8 on economizer feed water by-pass pipeline 3 has been shunted the flow that enters the water at low temperature in economizer, therefore economizer exit flue-gas temperature also can change.Concrete adjustment process is as follows:
When boiler moves or causes boiler export cigarette temperature drop low because of other reasons under underload, the flue-gas temperature that enters economizer surface also can reduce, when SCR inlet flue gas temperature monitoring thermocouple is found can not meet denitrification apparatus service requirement lower than the selected catalyst reaction temperatures of SCR, in order to guarantee the normal work of SCR equipment, by opening the second electric control valve 8 of economizer feed water by-pass pipeline 3, reduce the aperture of the first electric control valve 4 on tube connector 6 simultaneously, be adjusted to suitable position, make the economizer feedwater of part low temperature directly arrive economizer exit header through economizer feed water by-pass pipeline, the low temperature discharge reduction of flowing through in economizer surface, thereby can reduce the high-temperature flue gas heat absorption to the economizer outside of flowing through, the final flue-gas temperature that improves economizer exit place.The first electric control valve 4 and the second electric control valve 8 adopt electric intelligent type executing agency, can include boiler DCS control system in, facilitate operations staff to operate control at central station of floating dock.By regulating the aperture of the first electric control valve 4, the second electric control valve 8, reduce the low temperature water yield that enters economizer, improve the flue-gas temperature of SCR entrance; If the flue-gas temperature of SCR entrance does not still reach pre-provisioning request, boiler DCS control system is controlled the electric intelligent type executing agency of the first electric control valve 4 and the second electric control valve 8, continue the aperture that regulates the first electric control valve 4 to close the second electric control valve 8, until flue-gas temperature reaches requirement.
Otherwise, raising along with boiler load, the flue-gas temperature that enters economizer surface also can improve, when SCR inlet flue gas temperature monitoring thermocouple is found can not meet denitrification apparatus service requirement higher than the selected catalyst reaction temperatures of SCR, in order to guarantee the normal work of SCR equipment, the aperture and the aperture that reduces the second electric control valve 8 that by adjusting, increase by the first electric control valve 4, increase the low temperature water yield that enters economizer, reduces the flue-gas temperature of SCR entrance; If the flue-gas temperature of SCR entrance does not still reach pre-provisioning request, boiler DCS control system is controlled the electric intelligent type executing agency of the first electric control valve 4, the second electric control valve 8, continue to regulate the aperture of the first electric control valve 4 and the second electric control valve 8, until flue-gas temperature reaches requirement.
Cited embodiment is only for understanding the utility model above; it is not the restriction to the described technical scheme of the utility model; the those of ordinary skill in relevant field; on the basis of technical scheme described in claim; can also make multiple variation or distortion, within all variations that are equal to or distortion all should be encompassed in claim protection domain of the present utility model.
Claims (3)
1. a controlled warm type economizer, comprise back-end ductwork and be arranged in economizer, the SCR equipment on back-end ductwork, also comprise economizer exit header, economizer import header and economizer feed pipe, economizer feed pipe is connected with economizer import header by tube connector, it is characterized in that: described tube connector is provided with the first electric control valve; Between economizer feed pipe and economizer exit header, be also connected with economizer feed water by-pass pipeline.
2. controlled warm type economizer according to claim 1, it is characterized in that: described economizer feed water by-pass pipeline is provided with the second electric control valve, described SCR equipment entrance place is provided with flue gas temperature measurement device, between flue gas temperature measurement device and the first electric control valve, the second electric control valve, is provided with feedback controls device.
3. controlled warm type economizer according to claim 2, is characterized in that: described flue gas temperature measurement device is thermocouple.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320642297.2U CN203517748U (en) | 2013-10-18 | 2013-10-18 | Temperature controllable coal economizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320642297.2U CN203517748U (en) | 2013-10-18 | 2013-10-18 | Temperature controllable coal economizer |
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| Publication Number | Publication Date |
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| CN203517748U true CN203517748U (en) | 2014-04-02 |
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| CN201320642297.2U Expired - Lifetime CN203517748U (en) | 2013-10-18 | 2013-10-18 | Temperature controllable coal economizer |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103941764A (en) * | 2014-05-10 | 2014-07-23 | 蚌埠玻璃工业设计研究院 | Adjusting device for denitration temperature of waste heat power generation boiler in glass furnace |
| CN104879743A (en) * | 2015-05-22 | 2015-09-02 | 中国神华能源股份有限公司 | Boiler thermodynamic system and boiler |
| CN105299615A (en) * | 2015-12-14 | 2016-02-03 | 江苏中科重工股份有限公司 | Coal economizer |
| CN108397762A (en) * | 2018-06-04 | 2018-08-14 | 周舒丹 | A kind of system promoting economizer exit smoke temperature |
| CN108870352A (en) * | 2018-08-01 | 2018-11-23 | 南京南锅动力设备有限公司 | A kind of afterheat boiler system device for shutting down afterburning function with gas turbine |
| CN114251648A (en) * | 2021-12-31 | 2022-03-29 | 华西能源工业股份有限公司 | Pipeline system for maintaining exhaust gas temperature |
-
2013
- 2013-10-18 CN CN201320642297.2U patent/CN203517748U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103941764A (en) * | 2014-05-10 | 2014-07-23 | 蚌埠玻璃工业设计研究院 | Adjusting device for denitration temperature of waste heat power generation boiler in glass furnace |
| CN104879743A (en) * | 2015-05-22 | 2015-09-02 | 中国神华能源股份有限公司 | Boiler thermodynamic system and boiler |
| CN105299615A (en) * | 2015-12-14 | 2016-02-03 | 江苏中科重工股份有限公司 | Coal economizer |
| CN108397762A (en) * | 2018-06-04 | 2018-08-14 | 周舒丹 | A kind of system promoting economizer exit smoke temperature |
| CN108397762B (en) * | 2018-06-04 | 2023-10-31 | 周舒丹 | System for promote economizer export cigarette temperature |
| CN108870352A (en) * | 2018-08-01 | 2018-11-23 | 南京南锅动力设备有限公司 | A kind of afterheat boiler system device for shutting down afterburning function with gas turbine |
| CN114251648A (en) * | 2021-12-31 | 2022-03-29 | 华西能源工业股份有限公司 | Pipeline system for maintaining exhaust gas temperature |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140402 |