CN104624072A - Flue gas premixing device and denitration reactor and method based on same - Google Patents

Flue gas premixing device and denitration reactor and method based on same Download PDF

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CN104624072A
CN104624072A CN201510072784.3A CN201510072784A CN104624072A CN 104624072 A CN104624072 A CN 104624072A CN 201510072784 A CN201510072784 A CN 201510072784A CN 104624072 A CN104624072 A CN 104624072A
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outlet
dish
gas
air inlet
flue gas
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CN104624072B (en
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鲁金涛
张波
杨珍
谷月峰
徐宏杰
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China Huaneng Group Co Ltd
Xian Thermal Power Research Institute Co Ltd
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China Huaneng Group Co Ltd
Xian Thermal Power Research Institute Co Ltd
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Abstract

The invention discloses a flue gas premixing device and a denitration reactor and a method based on the flue gas premixing device. The flue gas premixing device comprises an inlet disk and an outlet disk; Na air inlets and a measuring device for measuring the percentage concentration of each gas in a mixed gas in each air inlet are arranged on the inlet disk; and Nb air outlets are formed in the outlet disk, wherein Na is equal to or greater than 3, Nb is equal to or greater than 2, ad Nb is lower than or equal to Na; each air outlet in the outlet disk is communicated with the plurality of air inlets in the inlet disk by pipelines. The denitration rate of the flue gas is improved by homogenizing the percentage concentration of NH3 gas in the mixed gas of different positions of inlet of an SCR (selective catalytic reduction) reactor.

Description

Flue gas pre-mixing apparatus and based on the Benitration reactor of this flue gas pre-mixing apparatus and method
Technical field
The invention belongs to boiler field of Environment Protection, relate to a kind of flue gas pre-mixing apparatus and based on the desulfurization reactor of this flue gas pre-mixing apparatus and method.
Background technology
Along with China's expanding economy, the environmental pollution that energy resource consumption brings is also more and more serious.Wherein the harmful substance such as flue dust, sulfur dioxide, nitrogen oxide causes the main contributor of atmosphere pollution, acid rain and greenhouse effects.Add up according to State Environmental Protection Administration, nitrogen oxide (NOx) discharge capacity of China 67% comes from the burning of coal, 2005 and power plants coal consumption amount in 2010 account for 56% and 64% of national total amount respectively, and thermal power plant's NOx generation accounts for 50% of national total amount.From fire coal consumption to NOx emission contribution margin, it is China's NOx emission overall control key point that thermal power plant's NOx emission controls." thermal power plant's atmosphere pollution control discharge standard " up-to-date along with China and the issuing and implementation of the Air Pollution Prevention Law and the formally effective of Kyoto Protocol, the domestic emission control to NOx will be increasingly strict, adopt effective NOx emission control measure imperative in thermal power plant.
In numerous denitration technologies, selective catalytic reduction (SCR) makes NOX and the NH3 in flue gas produce reaction by catalyst and generates N2 and the H2O harmless to air in suitable temperature range, thus reach the object of the NOX in removing flue gas, be denitration efficiency denitration technology that is the highest, maturation the most.
SCR system generally sprays into system, reactor assembly, economizer bypass, SCR bypass, detecting and controlling system etc. by the stocking system of ammonia, ammonia and air mixing systems, ammonia and forms.Wherein, before SCR reactor is arranged at air preheater, ammonia is uniformly distributed mixing by a kind of special sprayer unit and flue gas above SCR reactor, and after mixing, flue gas carries out reduction reaction by catalyst in reactor layer.Reach qualified denitration rate and ensure that lower ammonia escapement ratio is a difficult point in SCR engineering simultaneously, this requirement needed NH3 to mix with flue gas is full and uniform before catalytic reaction, especially required that the ratio of each position NH3 and NOX of the entrance at reactor is consistent.If local ammonia is not enough or ammonia is excessive, the abundant operation of denitration reaction system all can be affected.When NH3 mixes uneven with flue gas, except reducing nitric efficiency, also can remain ammonia phenomenon, residual ammonia and SO2 react and generate (NH4) 2SO4, NH4HSO4 is easy to carry out pickup to air preheater, very large on air preheater impact.As, the porch of certain Large-sized Coal-fired Power group SCR denitration reactor domestic, the NH3 concentration of diverse location differs several times even tens times, has had a strong impact on the denitration rate of SCR.
In order to improve station boiler SCR denitration system denitration rate, more existing patented technologies are transformed traditional SCR device and innovate at present.As, invention " improves the method for station boiler SCR denitration system denitration rate ", and (201310493039.7) disclose a kind of CONCENTRATION DISTRIBUTION passing through the NOx measuring SCR denitration reactor outlet, and the way of the valve opening of ammonia-spraying grid respective regions is adjusted according to the CONCENTRATION DISTRIBUTION of the NOx of SCR denitration reactor outlet, improve the uniformity that SCR reactor outlet NOx distributes, improve denitration rate.Invention " SCR denitration device and denitration method for flue gas " (201310471414.8) provides a kind of SCR denitration device and denitration method for flue gas from the angle of catalyst, by fine catalyst being sprayed into the catalyst injector in described flue, ensure that catalyst has maximum respond, extend the time of staying of fine catalyst simultaneously, increase catalytic efficiency.Invention " a kind of SCR denitration dust arrester " (201210179086.X) is from the angle of the pre-dedusting of flue gas, a kind of dust arrester is communicated to the reactor inlet flue before Benitration reactor, thus effective process of bulky grain flying dust to the easiest blocking catalyst.
Summary of the invention
The object of the invention is to the shortcoming overcoming above-mentioned prior art, provide a kind of flue gas pre-mixing apparatus and based on the Benitration reactor of this flue gas pre-mixing apparatus and method, this device and based on the Benitration reactor of this device and method by NH in mist on even SCR reactor inlet place diverse location 3the percent concentration of gas improves the denitration rate of flue gas.
For achieving the above object, flue gas pre-mixing apparatus flue gas pre-mixing apparatus of the present invention comprises entrance dish and outlet dish, and entrance dish is provided with N a 2individual air inlet and the measurement mechanism for the percent concentration of measuring each gas in mist in each air inlet, outlet dish is provided with N bindividual gas outlet, wherein N a>=3, N b>=2, N b≤ N a, any one gas outlet on outlet dish is all connected by pipeline with the some air inlets on entrance dish.
Described entrance dish is divided into N a 2the first area of individual area equation, wherein, each first area all offers an air inlet;
Described outlet dish is divided into N bthe second area of individual area equation, wherein, each second area all offers a gas outlet.
Benitration reactor of the present invention comprises NH 3reactor, flue gas pre-mixing apparatus and SCR reactor, the back-end ductwork outlet of boiler and NH 3the NH of generator 3the each air inlet of outlet by pipeline and in Guan Houyu flue gas pre-mixing apparatus on entrance dish is connected, and each gas outlet on flue gas pre-mixing apparatus middle outlet dish is connected with the entrance of SCR reactor.
Economizer is provided with in the back-end ductwork of described boiler.
Denitration reaction method of the present invention comprises the following steps:
1) boiler produce flue gas and NH 3the NH that generator produces 3gas forms mist after mixing in pipeline, and is input in each air inlet on entrance dish, and NH in each air inlet place mist to be measured on entrance dish in real time by measurement mechanism 3the percent concentration of gas;
2) according to NH in each air inlet place mist on the entrance dish detected 3the percent concentration of gas selects the annexation of each gas outlet on each air inlet and outlet dish, makes NH in the mist that on outlet dish, each gas outlet exports 3the percent concentration of gas is identical;
3) react in SCR reactor after the mist that on outlet dish, each gas outlet exports enters into SCR reactor, complete the denitration process of flue gas.
Step 2) concrete operations be: establish entrance dish to be provided with B air inlet, outlet dish is provided with C gas outlet, and wherein, B=A*C, then according to NH in mist 3a large young pathbreaker B air inlet for the percent concentration of gas is divided into A group, is then connected with K gas outlet on outlet dish by pipeline by K air inlet in A group, wherein, and 1≤K≤C.
The present invention has following beneficial effect:
Flue gas pre-mixing apparatus of the present invention and carry out in the process of denitration at the flue gas produced boiler based on the Benitration reactor of this flue gas pre-mixing apparatus and method, the flue gas first boiler produced and NH 3be mixed to form mist, then described mist be input in each air inlet of entrance dish, to measure in each air inlet NH in mist simultaneously 3the percent concentration of gas, then according to NH in mist in each air inlet 3the each air inlet of large young pathbreaker of the percent concentration of gas is connected to by pipeline in each gas outlet on outlet dish, make the flow velocity of the mist that outlet dish exports in each gas outlet and concentration identical, to make on SCR reactor inlet place diverse location NH in mist 3the percent concentration of gas is identical, and then improves the denitration rate of flue gas, and structure is simple, easy to operate.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Wherein, 1 be SCR reactor, 2 be entrance dish, 3 be outlet dish, 4 for flexible pipe.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in further detail:
With reference to figure 1, flue gas pre-mixing apparatus flue gas pre-mixing apparatus of the present invention comprises entrance dish 2 and outlet dish 3, and entrance dish 2 is provided with N a 2individual air inlet and the measurement mechanism for the percent concentration of measuring each gas in mist in each air inlet, outlet dish 3 is provided with N bindividual gas outlet, wherein N a>=3, N b>=2, N b≤ N a, any one gas outlet on outlet dish 3 is all connected by pipeline with the some air inlets on entrance dish 2.It should be noted that, described entrance dish 2 is divided into N a 2the first area of individual area equation, wherein, each first area all offers an air inlet; Outlet dish 3 is divided into N bthe second area of individual area equation, wherein, each second area all offers a gas outlet, the gas outlet on outlet dish 3 is connected by flexible pipe 4 with the air inlet on entrance dish 2.
Benitration reactor of the present invention comprises NH 3reactor, flue gas pre-mixing apparatus and SCR reactor 1, the back-end ductwork outlet of boiler and NH 3the NH of generator 3the each air inlet of outlet by pipeline and in Guan Houyu flue gas pre-mixing apparatus on entrance dish 2 is connected, and each gas outlet on flue gas pre-mixing apparatus middle outlet dish 3 is connected with the entrance of SCR reactor 1, is provided with economizer in the back-end ductwork of boiler.
Denitration reaction method of the present invention comprises the following steps:
1) boiler produce flue gas and NH 3the NH that generator produces 3gas forms mist after mixing in pipeline, and is input in each air inlet on entrance dish 2, and NH in each air inlet place mist to be measured on entrance dish 2 in real time by measurement mechanism 3the percent concentration of gas;
2) according to NH in each air inlet place mist on the entrance dish 2 detected 3the percent concentration of gas selects the annexation of each gas outlet on each air inlet and outlet dish 3, makes NH in the mist that on outlet dish 3, each gas outlet exports 3the percent concentration of gas is identical;
3) react in SCR reactor 1 after the mist that on outlet dish 3, each gas outlet exports enters into SCR reactor 1, complete the denitration process of flue gas.
Step 2) concrete operations be: establish entrance dish 2 to be provided with B air inlet, outlet dish 3 is provided with C gas outlet, and wherein, B=A*C, then according to NH in mist 3a large young pathbreaker B air inlet for the percent concentration of gas is divided into A group, is then connected with K gas outlet on outlet dish 3 by pipeline by K air inlet in A group, wherein, and 1≤K≤C.
Embodiment one
According to flue size, in flue gas pre-mixing apparatus, entrance dish 2 is divided into the first area of 64 area equation, and installs 64 air inlets.Outlet dish 3 is divided into the second area of 4 area equation, and installs 4 gas outlets, then according to NH in mist in each air inlet 3large young pathbreaker 64 air inlets of percent concentration shared by gas are divided into 16 groups, reference table 1, wherein the numbering of first group of air inlet is respectively 11, 12, 13 and 14, second group of air inlet be numbered 21, 22, 23 and 24, the numbering of the 3rd group of air inlet is respectively 31, 32, 33 and 34, the numbering of the 4th group of air inlet is respectively 41, 42, 43 and 44, the numbering of the 5th group of air inlet is respectively 51, 52, 53 and 54, the numbering of the 6th group of air inlet is respectively 61, 62, 63 and 34, the numbering of the 7th group of air inlet is respectively 71, 72, 73 and 74, the numbering of the 8th group of air inlet is respectively 81, 82, 83 and 84, the numbering of the 9th group of air inlet is respectively 91, 92, 93 and 94, the numbering of the tenth group of air inlet is respectively 101, 102, 103 and 104, the numbering of the 11 group of air inlet is respectively 111, 112, 113 and 114, the numbering of the 12 group of air inlet is respectively 121, 1122, 123 and 124, the numbering of the 13 group of air inlet is respectively 131, 132, 133 and 134, the numbering of the 14 group of air inlet is respectively 141, 142, 143 and 144, the numbering of the 15 group of air inlet is respectively 151, 152, 153 and 154, the numbering of the 16 group of air inlet is respectively 161, 162, 163 and 164, reference table 2, then after distributing, on outlet dish 3, the numbering of the air inlet of first gas outlet connection is respectively 11, 21, 31, 41, 51, 61, 71, 81, 91, 101, 111, 121, 131, 141, 151 and 161, the numbering of the air inlet of second gas outlet connection is respectively 12, 22, 32, 42, 52, 62, 72, 82, 92, 102, 112, 122, 132, 142, 152 and 162, the air inlet that 3rd gas outlet connects be numbered 13, 23, 33, 43, 53, 63, 73, 83, 93, 103, 123, 133, 143, 153 and 163, the numbering of the air inlet of the 4th gas outlet connection is respectively 14, 24, 34, 44, 54, 64, 74, 84, 94, 104, 114, 124, 134, 144, 154 and 164.
Table 1
11 12 21 22 31 32 41 42
13 14 23 24 33 34 43 44
51 52 61 62 71 72 81 82
53 54 63 64 73 74 83 84
91 92 101 102 111 112 121 122
93 94 103 104 113 114 123 124
131 132 141 142 151 152 161 162
133 134 143 144 153 154 163 164
Table 2
11 21 31 41 12 22 32 42
51 61 71 81 52 62 72 82
91 101 111 121 92 102 112 122
131 141 151 161 132 142 152 162
13 23 33 43 14 24 34 44
53 63 73 83 54 64 74 84
93 103 113 123 94 104 114 124
133 143 153 163 134 144 154 164
The gas approach cross section diverse location of SCR denitration reactor measures smoke components, and point position is in table 3, and the measurement result before and after installation flue gas pre-mixing apparatus is see table 4.
Table 3
Table 4

Claims (6)

1. a flue gas pre-mixing apparatus, is characterized in that, comprise entrance dish (2) and outlet dish (3), (2) are provided with N with entrance dish a 2individual air inlet and the measurement mechanism for the percent concentration of measuring each gas in mist in each air inlet, (3) are provided with N with outlet dish bindividual gas outlet, wherein N a>=3, N b>=2, N b≤ N a, any one gas outlet on outlet dish (3) is all connected by pipeline with the some air inlets on entrance dish (2).
2. flue gas pre-mixing apparatus according to claim 1, is characterized in that,
Described entrance dish (2) is divided into N a 2the first area of individual area equation, wherein, each first area all offers an air inlet;
Described outlet dish (3) is divided into N bthe second area of individual area equation, wherein, each second area all offers a gas outlet.
3. a Benitration reactor, is characterized in that, based on flue gas pre-mixing apparatus according to claim 1, comprises NH 3reactor, flue gas pre-mixing apparatus and SCR reactor (1), the back-end ductwork outlet of boiler and NH 3the NH of generator 3the each air inlet of outlet by pipeline and in Guan Houyu flue gas pre-mixing apparatus on entrance dish (2) is connected, and each gas outlet on flue gas pre-mixing apparatus middle outlet dish (3) is connected with the entrance of SCR reactor (1).
4. Benitration reactor according to claim 3, is characterized in that, is provided with economizer in the back-end ductwork of described boiler.
5. a denitration reaction method, based on Benitration reactor according to claim 3, is characterized in that, comprises the following steps:
1) boiler produce flue gas and NH 3the NH that generator produces 3gas forms mist after mixing in pipeline, and is input in each air inlet on entrance dish (2), and NH in entrance dish (2) upper each air inlet place mist measured in real time by measurement mechanism 3the percent concentration of gas;
2) according to NH in the entrance dish (2) detected upper each air inlet place mist 3the percent concentration of gas selects the annexation of each air inlet and the upper each gas outlet of outlet dish (3), NH in the mist that the upper each gas outlet of outlet dish (3) is exported 3the percent concentration of gas is identical;
3) react in SCR reactor (1) after the mist that the upper each gas outlet of outlet dish (3) exports enters into SCR reactor (1), complete the denitration process of flue gas.
6. denitration reaction method according to claim 5, is characterized in that, step 2) concrete operations be: establish entrance dish (2) to be provided with B air inlet, outlet dish (3) is provided with C gas outlet, wherein, B=A*C, then according to NH in mist 3a large young pathbreaker B air inlet for the percent concentration of gas is divided into A group, is then connected with K gas outlet on outlet dish (3) by pipeline by K air inlet in A group, wherein, and 1≤K≤C.
CN201510072784.3A 2015-02-11 2015-02-11 Flue gas pre-mixing apparatus and Benitration reactor based on this flue gas pre-mixing apparatus and method Active CN104624072B (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5009856A (en) * 1988-12-05 1991-04-23 Consolidation Coal Company Recycling catalyst bed for flue gas treatment
JP2003144908A (en) * 2001-11-12 2003-05-20 Mitsubishi Heavy Ind Ltd Gas distribution plate of reactor
CN101642678A (en) * 2009-08-28 2010-02-10 中电投远达环保工程有限公司 Cascading type rectifier used for SCR denitration device
CN202315668U (en) * 2011-12-01 2012-07-11 中电投远达环保工程有限公司 Ammonia injection mixing system for selective catalytic reduction (SCR) denitration device
CN203598693U (en) * 2013-11-27 2014-05-21 浙江蓝天求是环保股份有限公司 Wedge-shaped tapered rectifying grating for SCR (selective catalytic reduction) denitration device
CN204485673U (en) * 2015-02-11 2015-07-22 中国华能集团公司 Flue gas pre-mixing apparatus and the Benitration reactor based on this flue gas pre-mixing apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5009856A (en) * 1988-12-05 1991-04-23 Consolidation Coal Company Recycling catalyst bed for flue gas treatment
JP2003144908A (en) * 2001-11-12 2003-05-20 Mitsubishi Heavy Ind Ltd Gas distribution plate of reactor
CN101642678A (en) * 2009-08-28 2010-02-10 中电投远达环保工程有限公司 Cascading type rectifier used for SCR denitration device
CN202315668U (en) * 2011-12-01 2012-07-11 中电投远达环保工程有限公司 Ammonia injection mixing system for selective catalytic reduction (SCR) denitration device
CN203598693U (en) * 2013-11-27 2014-05-21 浙江蓝天求是环保股份有限公司 Wedge-shaped tapered rectifying grating for SCR (selective catalytic reduction) denitration device
CN204485673U (en) * 2015-02-11 2015-07-22 中国华能集团公司 Flue gas pre-mixing apparatus and the Benitration reactor based on this flue gas pre-mixing apparatus

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