CN104819451B - A kind of boiler economizer that can control SCR inlet flue-gas temperature - Google Patents
A kind of boiler economizer that can control SCR inlet flue-gas temperature Download PDFInfo
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- CN104819451B CN104819451B CN201510160946.9A CN201510160946A CN104819451B CN 104819451 B CN104819451 B CN 104819451B CN 201510160946 A CN201510160946 A CN 201510160946A CN 104819451 B CN104819451 B CN 104819451B
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Abstract
The invention discloses a kind of boiler economizer that can control SCR inlet flue-gas temperature, including heat exchange pipeline, enter with described heat exchange pipeline, export the inlet header and outlet header being connected, described inlet header is connected with cold water pipes, described outlet header is connected with hot water pipeline, two pipelines intersected but be not communicated with it are equipped with between described cold water pipes and hot water pipeline, it is respectively the first connecting pipe and the second connecting pipe, and on pipeline, clamp controllable valve, when economizer high load capacity or underrun, the water (flow) direction in pipeline is changed by controlling the opening and closing of controllable valve, thus the cooling extent of flue gas in controlling economizer, to control SCR inlet flue-gas temperature, ensure that SCR inlet flue gas is maintained at denitrating catalyst optimal reaction temperature interval.The present invention, by changing economizer concurrent-countercurrent arrangement, controls SCR inlet flue-gas temperature, extends the life-span of denitrating catalyst, improves denitration efficiency.
Description
Technical field
The present invention relates to thermal power plant, specifically refer to a kind of boiler that can control SCR inlet flue-gas temperature and save
Coal device.
Background technology
Along with generating set maximizes and the raising year by year of environmental requirement, the emission limit of nitrogen oxides constantly reduces,
Pollutant emission expense levying standard improves again and again, and therefore, reduction nitrogen oxide emission becomes power plant and mainly appoints
One of business.
Power plant's denitration at present is generally SCR (SCR) technology, and SCR technology has NOXRemoving
Efficiency is high, secondary pollution is little and the feature such as technology maturation, and its ultimate principle is by ammonification, at catalyst bar
By NO under partXIt is converted into naturally occurring nitrogen (N in air2) and water (H2O).But meanwhile, flue gas
In SO2SO can be oxidized under conditions of SCR catalyst3, and when SCR reaction temperature reduces, SO3
Can be with the NH of excess3Reaction generates ammonium salt, and then is attached to catalyst surface, causes the blocking of catalyst, from
And reduce its activity.So reaction temperature can be defined by SCR control system, when flue-gas temperature is reduced to limit
During definite value, cut off ammonia supply, prevent catalysqt deactivation.
For general catalyst, this limit value is 310 DEG C to 320 DEG C.Under the conditions of unit oepration at full load, flue gas
Temperature is higher, can meet SCR catalyst reaction temperature requirement, but for some reason, unit is in low
Load operation, when SCR inlet flue-gas temperature is reduced to below limit value, owing to not having ammonia supply, can cause
NOXDischarge capacity is substantially increased, it is impossible to meet environmental requirement.Therefore, in the case of performing low-load running of machine set, both protected
Card SCR catalyst activity does not reduces, and saves operating cost, ensures denitration efficiency again, meet the requirement of environmental protection
It is critical only that raising SCR inlet flue-gas temperature.
The boiler of power plant of prior art is provided with flue and gets rid of flue gas, for making full use of the heat energy of flue gas, in flue
Can be provided with economizer, economizer includes heat exchange pipeline, the inlet header being connected with heat exchange pipeline import and export and goes out
Mouthful header, inlet header is connected with cold water pipes, and outlet header is connected with hot water pipeline, cold water pipes and
Feed pump is connected, and by feed pump pump pressure feedwater, hot water pipeline, for hot water is sent to heating part, saves coal
Device is provided with temperature sensor on flue, is used for sensing flue-gas temperature.
Summary of the invention
It is an object of the invention to provide a kind of boiler economizer that can control SCR inlet flue-gas temperature, by changing
Become economizer concurrent-countercurrent arrangement, control SCR inlet flue-gas temperature, extend the life-span of denitrating catalyst, carry
High denitration efficiency.
Above-mentioned purpose of the present invention realizes by following technical solution: one can control SCR inlet flue gas temperature
The boiler economizer of degree, the inlet header including heat exchange pipeline, being connected with described heat exchange pipeline import and export and going out
Mouth header, described inlet header is connected with cold water pipes, and described outlet header is connected with hot water pipeline,
It is characterized in that: between described cold water pipes and hot water pipeline, be equipped with two pipelines intersected but be not communicated with,
Being respectively the first connecting pipe and the second connecting pipe, the first connecting pipe and the second connecting pipe are respectively with described
Cold water pipes intersect with hot water pipeline and connect, wherein, the first connecting pipe and cold water pipes intersect
Joint is positioned at the front of the joint that the second connecting pipe intersects with cold water pipes along water (flow) direction, and first even
The joint intersected with hot water pipeline of threading a pipe is positioned at the second connecting pipe along water (flow) direction and intersects with hot water pipeline
The front of the joint converged, described second connecting pipe is provided with the second controllable valve, described first connecting pipe
Being provided with the 3rd controllable valve, described cold water pipes intersects with the first connecting pipe and the second connecting pipe being positioned at
Pipeline section between two joints converged is provided with the 4th controllable valve, and described hot water pipeline is being positioned at first even
Thread a pipe and pipeline section between two joints that the second connecting pipe intersects is provided with the first controllable valve,
When economizer high load capacity or underrun, change the water in pipeline by controlling the opening and closing of four controllable valves
Flow path direction so that the water (flow) direction in pipeline can be in following current and adverse current with the flow direction of flue gas in economizer
Between change, thus the cooling extent of flue gas in controlling economizer, to control SCR inlet flue-gas temperature, it is ensured that SCR
It is interval that inlet flue gas is maintained at denitrating catalyst optimal reaction temperature, it is ensured that denitration efficiency.
In the present invention, described cold water pipes is connected with feed pump, by feed pump pump pressure feedwater, described hot water
Pipeline is for being sent to heating part by hot water.
In the present invention, described economizer is provided with temperature sensor on flue, is used for sensing flue-gas temperature, institute
State temperature sensor to be connected with valve positioner by holding wire, described valve positioner and four controlled valves
Door is connected by control line respectively.
In the present invention, valve positioner performs corresponding operating according to flue-gas temperature: economizer is when heavy-duty service
Flue-gas temperature is high, and the first controllable valve and the 4th controllable valve are opened, the second controllable valve and the 3rd controllable valve
Closing, economizer is the water (flow) direction in counter-flow arrangement form, i.e. pipeline and the flow direction of flue gas in economizer
Reversely, shredded tobacco for water pipes good effect of heat exchange, the coefficient of heat transfer is big, and feed temperature raises, and improves boiler efficiency；Economizer exists
During underload, when flue-gas temperature is reduced to below denitrating catalyst optimal reaction temperature limit value, the first controlled valve
Door and the 4th controllable valve are closed, and the second controllable valve and the 3rd controllable valve are opened, thus are become by economizer
In water (flow) direction in down current arrangement, i.e. pipeline and economizer, the flow direction of flue gas is in the same direction, shredded tobacco for water pipes heat transfer effect
Difference, reduces the coefficient of heat transfer, and the heat that feedwater absorbs from flue gas tails off so that the fall of flue-gas temperature in economizer
Low amplitude diminishes so that the exit gas temperature of economizer still keeps certain temperature, the exiting flue gas of economizer
The temperature i.e. entrance flue gas temperature of SCR, it is ensured that SCR inlet flue-gas temperature is maintained at denitrating catalyst optimum response
Temperature range, it is ensured that spray ammonia system is properly functioning, it is ensured that denitration efficiency will not decline.
Compared with prior art, the present invention has a following remarkable result:
(1) economizer of the present invention can raise SCR inlet cigarette temperature in the case of boiler at low load, it is ensured that denitration
Catalyst works at optimal reaction temperature, improves catalyst life, reduces denitration operating cost；
(2) economizer of the present invention is without significantly changing economizer and SCR denitration system, transformation
Cost is little；
(3) economizer of the present invention only increases two arms and 4 controllable valves, the parts of increase
Less, reliability is high, easy to maintenance；
(4) the economizer regulation process of the present invention only has 4 controllable valve variations, easy to adjust, simply；
(5) the economizer controllable valve operation of the present invention only opens and closes two kinds of signals, and control system is simple；
(6) economizer of the present invention regulates controllable valve according to temperature signal, and response speed is fast, and accuracy is higher.
Accompanying drawing explanation
With specific embodiment, the present invention is described in further details below in conjunction with the accompanying drawings:
Fig. 1 is economizer pipe arrangement schematic diagram of the present invention.
Description of reference numerals:
1, heat exchange pipeline；2, outlet header；3, inlet header；4, the first controllable valve；
5, the second controllable valve；6, the 3rd controllable valve；7, the 4th controllable valve；8, hot water pipeline；
9, cold water pipes；10, the first connecting pipe；11, the second connection arm；12, feed pump；
13, temperature sensor
Detailed description of the invention
A kind of boiler economizer that can control SCR inlet flue-gas temperature as shown in Figure 1, including heat exchange pipeline
1, the inlet header 3 being connected with heat exchange pipeline 1 import and export and outlet header 2, inlet header 3 and cold water pipe
Road 9 is connected, and outlet header 2 is connected with hot water pipeline 8, and cold water pipes 9 is connected with feed pump 12,
By feed pump 12 pump pressure feedwater, hot water pipeline 8 is for being sent to heating part by hot water, and economizer is on flue
It is provided with temperature sensor 13, is used for sensing flue-gas temperature.
It is equipped with two pipelines intersected but be not communicated with between cold water pipes 9 and hot water pipeline 8, is respectively
First connecting pipe 10 and the second connecting pipe 11, the first connecting pipe 10 and the second connecting pipe 11 respectively with
Cold water pipes 9 intersects with hot water pipeline 8 and connects, wherein, and the first connecting pipe 10 and cold water pipes 9 phase
Before the joint crossed is positioned at, along water (flow) direction, the joint that the second connecting pipe 11 and cold water pipes 9 intersect
Side, the joint that the first connecting pipe 10 and hot water pipeline 8 intersect is positioned at the second connecting pipe along water (flow) direction
The front of 11 joints intersected with hot water pipeline 8, the second connecting pipe 11 is provided with the second controllable valve 5,
First connecting pipe 10 is provided with the 3rd controllable valve 6, cold water pipes 9 be positioned at the first connecting pipe 10 and
Pipeline section between two joints that second connecting pipe 11 intersects is provided with the 4th controllable valve 7, hot-water line
Road 8 is at the pipe between two joints that the first connecting pipe 10 and the second connecting pipe 11 intersect
Section is provided with the first controllable valve 4, when economizer high load capacity or underrun, by controlling four controlled valves
The opening and closing of door changes the water (flow) direction in pipeline so that the water (flow) direction in pipeline and the stream of flue gas in economizer
Dynamic direction can be changed between following current and adverse current, thus the cooling extent of flue gas in controlling economizer, to control
SCR inlet flue-gas temperature, it is ensured that it is interval that SCR inlet flue gas is maintained at denitrating catalyst optimal reaction temperature, protects
Card denitration efficiency.
In the present invention, temperature sensor 13 is connected with valve positioner by holding wire, valve positioner and four
Individual controllable valve is connected by control line respectively.Can also be by the temperature value of observed temperature sensor 13, hands
Move and four controllable valves are controlled.
The economizer of the present invention, by changing the open and close of controllable valve, can change the concurrent-countercurrent mode of economizer,
By changing the concurrent-countercurrent arrangement of economizer, control SCR inlet flue-gas temperature, extend denitrating catalyst
Life-span.
When boiler is properly functioning, load is higher, economizer exit cigarette temperature, i.e. SCR inlet flue-gas temperature is higher,
Being between the optimum working temperature of denitrating catalyst, now temperature signal is delivered to controllable valve controller, the
Two controllable valves 5 and the 3rd controllable valve 6 are closed, and the first controllable valve 4 and the 4th controllable valve 7 are opened,
In economizer, current general direction is in opposite direction with flow of flue gas, belongs to counter-flow arrangement, and the coefficient of heat transfer is relatively big, gives
Coolant-temperature gage is higher, on the premise of ensureing optimal denitration temperature, can improve the thermal efficiency of boiler.
When boiler load is relatively low, SCR inlet flue-gas temperature is less than denitrating catalyst optimal reaction temperature, now,
In order to make spray ammonia system normally work, the first controllable valve 4 and the 4th controllable valve 7 are closed, the second controlled valve
Door 5 and the 3rd controllable valve 6 are opened, and economizer becomes down current arrangement, and coefficient of heat transfer move counter-current reduces, cigarette
Temperature reduces amplitude and reduces so that economizer exit cigarette temperature, i.e. SCR inlet cigarette temperature are maintained at denitrating catalyst
Optimal reaction temperature is interval, it is ensured that denitration efficiency is at normal level.
The above embodiment of the present invention is not limiting the scope of the present invention, and embodiments of the present invention are not
Being limited to this, all this kind is according to the foregoing of the present invention, according to ordinary technical knowledge and the strong hand of this area
Section, without departing under the present invention above-mentioned basic fundamental thought premise, other making said structure of the present invention is many
The amendment of kind of form, replace or change, all should fall within the scope and spirit of the invention.
Claims (3)
1. can control a boiler economizer for SCR inlet flue-gas temperature, including heat exchange pipeline (1) and institute
State inlet header (3) and outlet header (2) that heat exchange pipeline (1) import and export is connected, described import connection
Case (3) is connected with cold water pipes (9), and described outlet header (2) is connected with hot water pipeline (8),
It is characterized in that: be equipped with between described cold water pipes (9) and hot water pipeline (8) two intersect but not
The pipeline communicated, the respectively first connecting pipe (10) and the second connecting pipe (11), the first connecting pipe (10)
Intersect with described cold water pipes (9) and hot water pipeline (8) respectively with the second connecting pipe (11) and connect
Logical, wherein, the joint that the first connecting pipe (10) intersects with cold water pipes (9) is positioned at along water (flow) direction
The front of the joint that the second connecting pipe (11) and cold water pipes (9) intersect, the first connecting pipe (10)
The joint intersected with hot water pipeline (8) is positioned at the second connecting pipe (11) and hot water pipeline along water (flow) direction
(8) front of the joint intersected, described second connecting pipe (11) is provided with the second controllable valve (5),
Described first connecting pipe (10) is provided with the 3rd controllable valve (6), described cold water pipes (9) be positioned at
Set on pipeline section between two joints that first connecting pipe (10) and the second connecting pipe (11) intersect
Having the 4th controllable valve (7), described hot water pipeline (8) is being positioned at the first connecting pipe (10) and second even
The pipeline section threaded a pipe between two joints that (11) intersect is provided with the first controllable valve (4), is saving coal
When device high load capacity or underrun, change the current side in pipeline by controlling the opening and closing of four controllable valves
To so that in water (flow) direction in pipeline and economizer, the flow direction of flue gas can turn between following current and adverse current
Change, thus the cooling extent of flue gas in controlling economizer, to control SCR inlet flue-gas temperature, it is ensured that SCR enters
It is interval that mouth flue gas is maintained at denitrating catalyst optimal reaction temperature, it is ensured that denitration efficiency.
The boiler economizer that can control SCR inlet flue-gas temperature the most according to claim 1, its feature
It is: described cold water pipes (9) is connected with feed pump (12), by feed pump (12) pump pressure feedwater,
Described hot water pipeline (8) is for being sent to heating part by hot water.
The boiler economizer that can control SCR inlet flue-gas temperature the most according to claim 1 and 2, its
It is characterised by: described economizer is provided with temperature sensor (13) on flue, is used for sensing flue-gas temperature, institute
State temperature sensor (13) to be connected with valve positioner by holding wire, described valve positioner and four
Controllable valve is connected by control line respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510160946.9A CN104819451B (en) | 2015-04-03 | 2015-04-03 | A kind of boiler economizer that can control SCR inlet flue-gas temperature |
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| CN201510160946.9A CN104819451B (en) | 2015-04-03 | 2015-04-03 | A kind of boiler economizer that can control SCR inlet flue-gas temperature |
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| CN104819451B true CN104819451B (en) | 2016-08-24 |
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| CN106440895B (en) * | 2016-10-10 | 2018-10-23 | 华北电力大学（保定） | A method of the raising SCR inlet smoke temperature based on heat pipe |
| CN111637442B (en) * | 2020-05-24 | 2021-07-09 | 西安交通大学 | Configuration self-adaptive efficient flexible clean coal-fired power generation system and operation method |
| CN111637440A (en) * | 2020-05-24 | 2020-09-08 | 西安交通大学 | Configuration self-adaptive flexible clean cooperative coal-fired power generation system and operation method |
| CN113513745B (en) * | 2021-06-02 | 2023-06-20 | 华北电力科学研究院有限责任公司 | Low-temperature economizer system with low-temperature corrosion self-blocking function and operation method |
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| CA2587855A1 (en) * | 2006-05-09 | 2007-11-09 | The Babcock & Wilcox Company | Multiple pass economizer and method for scr temperature control |
| CN202563356U (en) * | 2012-04-25 | 2012-11-28 | 四川东能节能技术有限公司 | Boiler flue gas temperature regulating device before denitration |
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| CN203771375U (en) * | 2014-03-05 | 2014-08-13 | 东南大学 | Coal economizer for increasing flue-gas temperature at SCR system entrance |
| CN203927880U (en) * | 2014-03-05 | 2014-11-05 | 东南大学 | A kind of economizer that improves SCR system underrun denitration ability |
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2015
- 2015-04-03 CN CN201510160946.9A patent/CN104819451B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2587855A1 (en) * | 2006-05-09 | 2007-11-09 | The Babcock & Wilcox Company | Multiple pass economizer and method for scr temperature control |
| CN202563356U (en) * | 2012-04-25 | 2012-11-28 | 四川东能节能技术有限公司 | Boiler flue gas temperature regulating device before denitration |
| CN103697456A (en) * | 2013-12-30 | 2014-04-02 | 江苏正通宏泰股份有限公司 | Finned tube low-pressure economizer system using boiler waste heat |
| CN203771375U (en) * | 2014-03-05 | 2014-08-13 | 东南大学 | Coal economizer for increasing flue-gas temperature at SCR system entrance |
| CN203927880U (en) * | 2014-03-05 | 2014-11-05 | 东南大学 | A kind of economizer that improves SCR system underrun denitration ability |
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Effective date of registration: 20170808 Address after: 510630, No. fifth, No. 146-150, Whampoa Avenue, Tianhe District, Guangdong, Guangzhou Co-patentee after: North China Electric Power University Patentee after: Guangdong Electric Power Research Institute of energy technology limited liability company Address before: 510080 Dongfeng East Road, Guangdong, Guangzhou, water, Kong Kong, No. 8 Co-patentee before: North China Electric Power University Patentee before: ELECTRIC POWER RESEARCH INSTITUTE, GUANGDONG POWER GRID CO., LTD. |
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Effective date of registration: 20200707 Address after: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Co-patentee after: NORTH CHINA ELECTRIC POWER University Patentee after: Electric Power Research Institute of Guangdong Power Grid Co.,Ltd. Address before: 510630, No. 146-150, No. fifth, Whampoa Avenue, Tianhe District, Guangdong, Guangzhou Co-patentee before: NORTH CHINA ELECTRIC POWER University Patentee before: GUANGDONG ELECTRIC POWER SCIENCE RESEARCH INSTITUTE ENERGY TECHNOLOGY Co.,Ltd. |
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