CN103816802B - A kind of method for designing of SCR denitration reactor - Google Patents
A kind of method for designing of SCR denitration reactor Download PDFInfo
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- CN103816802B CN103816802B CN201410115303.8A CN201410115303A CN103816802B CN 103816802 B CN103816802 B CN 103816802B CN 201410115303 A CN201410115303 A CN 201410115303A CN 103816802 B CN103816802 B CN 103816802B
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Abstract
A method for designing for SCR denitration reactor, the method has three large steps: step one: set up angle steel or " ten " shape column in the corner of SCR denitration reactor, in order to transmit vertical force; Reduce the Influence from Eccentric of column and reduce the impact of reactor folding corner region temperature stress; Step 2: SCR denitration reactor inner support girder steel is connected employing with post and is articulated and connected, horizontal support adopts the flexible draw bar that rigidity is little; This way reduces constraint, to reduce the impact of SCR denitration reactor zone line temperature stress, release plane folding corner region temperature stress; Step 3: should consider that reactor wall plate and reinforcing rib are jointly stressed when SCR denitration reactor bearing capacity calculation, stress analysis; The with due regard to three-dimensional effect of structure, plate shell effect, makes structure not only safe but also economical.
Description
Technical field
The present invention relates to a kind of method for designing of SCR denitration reactor.It improves the one of traditional reactor, its temperature and eccentric load stress influence is little, save steel, belong to environmental technology field SCR (SCR) gas denitrifying technology.
Background technology
The atmosphere pollution produced after coal combustion mainly contains sulfur dioxide, nitrogen oxide, flue dust (pellet) and the carbon dioxide as greenhouse gases.Due to coal fire discharged and automotive emission, the pollution of the nitrogen oxide of China is very serious.
In recent years, along with the raising gradually of environmental requirement, in order to reduce the discharge capacity of smoke evacuation nitrogen oxide in tail gas, boiler and other equipment (as cement kiln, sintering machine etc.) of many industries (as electric power, chemical industry, iron and steel, cement, waste incineration etc.) set up equipment for denitrifying flue gas one after another.
Current SCR (SCR) denitrating flue gas method, because its efficiency is high, stable performance, is widely used in engineering both domestic and external, becomes the mainstream technology that smoke evacuation tail gas removes nitrogen oxide.SCR denitration system refers under the effect of catalyst, by spraying into ammonia in flue gas, the reduction of nitrogen oxide in flue gas being become nitrogen and water, does not cause secondary pollution to environment.The capital equipment of SCR denitration technique is SCR denitration reactor.
SCR denitration reactor is the place of nitrogen oxides in effluent (NOx) and ammonia gas react in SCR denitration technique, is the nucleus equipment of this denitrating technique.SCR denitration reactor cross section is generally the rectangle that length-width ratio is less than or equal to 2.5, the high-temperature flue gas that SCR denitration inside reactor delivery temperature is about 400 degrees Celsius, it is except bearing equipment self-weight, multilayer denitrification catalyst module weight, outside pressing in flue gas in dust stratification weight, wind load, snow load, reactor, also to bear by the difference variation of normal temperature ~ high temperature ~ normal temperature (temperature difference can reach 450 degree), the heat which floor girder steel of apparatus casing and inner support catalyst all will stand suitable amplitude rises and shrinkage, can produce sizable distortion and temperature stress.
(note: in SCR denitration reactor, main element is catalyst module, generally arranges 2 ~ 4 layers of catalyst in a reactor.And every layer of catalyst is close to one piece of tiling by polylith catalyst one piece and is formed.Monolith catalyst module is generally standard component, and module size is generally: be about 2m, wide about 1m, the cuboid of high 0.6 ~ 1.8m scope.Catalyst module weight is according to the difference of its height, and weight change is comparatively large, and every module weight is between 0.6 ~ 1.5T.）
Temperature stress is larger on the impact of SCR denitration reactor steel using amount.The beam of general traditional SCR denitration inside reactor vertical and horizontal and column all adopt and are rigidly connected, this can produce sizable temperature stress, for ensureing structural safety, the total stress of structure all will control in the range of stress of steel permission, this just needs to strengthen bar cross section, increase the consumption of steel, this way that just connect is not a kind of solution preferably.
Traditional reactor is generally that head tree generally adopts H type or box-type section by establishing four or many head trees that load is passed to bottom steelframe in addition, pastes and is welded in reactor exterior panel.Therefore no matter head tree adopts H type or box-type section shaped steel, and its centre of form distance reactor wallboard all exists certain bias.Reactor column generally need transmit larger vertical force, and due to the existence of this part bias, reactor column stress can increase, and certainly will increase the steel using amount of reactor.
The present invention is directed to above-mentioned two aspects causing reactor steel using amount to increase to improve, make its more adaptive temperature change, Influence from Eccentric is less, more saves steel.
Summary of the invention
1, the object of this invention is to provide a kind of temperature and eccentric load stress influence is little, save the SCR denitration reactor of steel.After SCR denitration reactor is heated, if allow it each to can be freely movable, then it would not produce temperature stress; If limitation and restriction, will produce temperature stress in addition.Restriction, the rigidity of constraint is larger, then the temperature stress produced is also larger.Therefore to the organization plan that the structure of larger variations in temperature may be suffered preferably to take " defeating a force with a tenderness ", should not be firmly anti-.
According to the structural configuration of SCR denitration reactor, the internal plane of every layer of catalyst support beam is all provided with the horizontal support of suitable rigidity, anti-side rigidity in surrounding wallboard plane and intensity are also very powerful, even if therefore the mullion of each layer brace summer two ends and wallboard adopts and is articulated and connected, this structural system is also stable, is quite complete " perpendicular box " structure.The rigidity that this perpendicular box structure surrounding is erected in wall plane is very big, but out-of-plane rigidity is very little, therefore the organization plan of " defeating a force with a tenderness " should be adopted, bean column node inside and outside wallboard plane is all adopted and is articulated and connected, the temperature stress that structure is suffered is minimum, farthest utilizes, plays the space behavior of perpendicular box structure.
The particularly corner post of SCR denitration reactor corner, if adopt single angle (or " ten " font column), the restriction ability of a corner limb to its vertical plane is very little, therefore the temperature stress produced is very small; In addition the vertical load of SCR denitration reactor passes to corner post by wallboard, to the corner post in " routine " employing " I-shaped " cross section, the stress that the stress that eccentric bending moment produces produces much larger than vertical load, corner post cross section is larger, and the stress that eccentric bending moment produces is also larger.It is eccentric and the temperature difference that the most of cross section of column, " I-shaped " cross section is used to opposing.And single angle corner post (" ten " font column can be adopted when load is larger), consider that same SCR denitration reactor wallboard is jointly stressed, then almost there is no bias.Can calculate by Axial-compression Column, therefore single angle corner post is much more reasonable, economical than tradition " I-steel " corner post.
2, in order to reach the object of foregoing invention, the present invention adopts following technical measures:
The method for designing of a kind of SCR denitration reactor of the present invention, the method concrete steps are as follows:
Step one: set up angle steel or " ten " shape column in the corner of SCR denitration reactor, in order to transmit vertical force.This way Main Function is the Influence from Eccentric and the impact of reduction reactor folding corner region temperature stress that reduce column.Refer to accompanying drawing of the present invention " Fig. 1 "---" SCR denitration reactor Typical Planar layout drawing ".
Step 2: SCR denitration reactor inner support girder steel is connected employing with post and is articulated and connected, horizontal support adopts the flexible draw bar that rigidity is little.This way main purpose reduces constraint, to reduce the impact of SCR denitration reactor zone line temperature stress, release plane folding corner region temperature stress.Refer to accompanying drawing of the present invention " Fig. 1 ".
Step 3: should consider when SCR denitration reactor bearing capacity calculation and stress analysis that reactor wall plate and reinforcing rib are jointly stressed.The with due regard to three-dimensional effect of " box " structure, plate shell effect, makes structure not only safe but also economical.
Wherein: in step one " Fig. 1 ", SCR denitration reactor catalyst supporting steel girder steel interplanar spacing is generally 2000mm.
Wherein: the flexible draw bar that in step 2, " Fig. 1 " plane is arranged adopts cross support, and arranges by the top of SCR denitration reactor catalyst support steel beam.Comer area lattice only establish a pull bar, refer to " Fig. 1 ".
Wherein: for considering rigidity and the space behavior of reactor wallboard in step 3, the stable of reactor wallboard need be ensured and there is certain rigidity.SCR denitration reactor wall plate thickness is generally 6mm.Consider that the reduction of high temperature allowable working stresses of steel is more, SCR denitration reactor sheet, timber matter generally adopt Q345B steel.For ensureing that SCR reactor wallboard has certain rigidity and margin of safety, need calculate according to load cross section model and the spacing of determining hoop reinforcing rib.SCR reactor-side wallboard reinforcing rib is arranged and is referred to " Fig. 2 "--" A-A profile " (reactor-side wallboard reinforcing rib typical layout).In figure, " large reinforcing rib " needs hoop border to arrange, generally adopts H profile steel, and it is identical with SCR denitration reactor catalyst brace summer interlamellar spacing that spacing is about 3500mm()." little reinforcing rib " generally adopts angle steel, and spacing is about 700mm.But " little reinforcing rib ", by column bottom position, suitably should be encrypted according to stress analysis result.
3, advantage and effect: SCR denitration temperature of reactor of the present invention and eccentric load stress influence little.Under equal operating mode load, save steel, save construction cost.
Accompanying drawing explanation
Fig. 1 is the present invention's " SCR denitration reactor Typical Planar layout drawing ";
Fig. 2 is " the A-A profile " of Fig. 1--reactor-side wallboard reinforcing rib typical layout
Detailed description of the invention
See Fig. 1, Fig. 2, the method for designing of a kind of SCR denitration reactor of the present invention, the method concrete steps are as follows:
Step one: set up angle steel or " ten " shape column in the corner of SCR denitration reactor, in order to transmit vertical force.This way Main Function is the Influence from Eccentric and the impact of reduction reactor folding corner region temperature stress that reduce column.Refer to accompanying drawing of the present invention " Fig. 1 "---" SCR denitration reactor Typical Planar layout drawing ".
Step 2: SCR denitration reactor inner support girder steel is connected employing with post and is articulated and connected, horizontal support adopts the flexible draw bar that rigidity is little.This way main purpose reduces constraint, to reduce the impact of SCR denitration reactor zone line temperature stress, release plane folding corner region temperature stress.Refer to accompanying drawing of the present invention " Fig. 1 ".
Step 3: should consider when SCR denitration reactor bearing capacity calculation and stress analysis that reactor wall plate and reinforcing rib are jointly stressed.The with due regard to three-dimensional effect of " box ", plate shell effect, makes structure not only safe but also economical.
Wherein:
In step one accompanying drawing " Fig. 1 ", SCR denitration reactor catalyst supporting steel girder steel interplanar spacing is generally 2000mm.
The flexible draw bar that in step 2, " Fig. 1 " plane is arranged adopts cross support, and arranges by the top of SCR denitration reactor catalyst support steel beam.Comer area lattice only establish a pull bar, refer to " Fig. 1 ".
For considering rigidity and the space behavior of reactor wallboard in step 3, the stable of reactor wallboard need be ensured and there is certain rigidity.SCR denitration reactor wall plate thickness is generally 6mm.Consider that the reduction of high temperature allowable working stresses of steel is more, SCR denitration reactor sheet, timber matter generally adopt Q345B steel.For ensureing that SCR reactor wallboard has certain rigidity and margin of safety, need calculate according to load cross section model and the spacing of determining hoop reinforcing rib.Typical case SCR reactor-side wallboard reinforcing rib is arranged and is referred to " Fig. 2 "--" A-A profile " (reactor-side wallboard reinforcing rib typical layout).In figure, " large reinforcing rib " needs hoop border to arrange, generally adopts H profile steel, and it is identical with SCR denitration reactor catalyst brace summer interlamellar spacing that spacing is about 3500mm()." little reinforcing rib " generally adopts angle steel, and spacing is about 700mm.But " little reinforcing rib ", by column bottom position, suitably should be encrypted according to stress analysis result.
Claims (1)
1. a method for designing for SCR denitration reactor, is characterized in that: the method concrete steps are as follows:
Step one: set up angle steel or " ten " shape column in the corner of SCR denitration reactor, in order to transmit vertical force, reduces the Influence from Eccentric of column and reduces the impact of reactor folding corner region temperature stress;
Step 2: SCR denitration reactor inner support girder steel is connected employing with post and is articulated and connected, horizontal support adopts the flexible draw bar that rigidity is little; To reduce the impact of SCR denitration reactor zone line temperature stress, release plane folding corner region temperature stress and minimizing constraint;
Step 3: should consider that reactor wall plate and reinforcing rib are jointly stressed when SCR denitration reactor bearing capacity calculation and stress analysis; Consider the three-dimensional effect of " box " structure, plate shell effect, make structure not only safe but also economical;
Wherein, this SCR denitration reactor catalyst supporting steel girder steel interplanar spacing is 2000mm;
Wherein, the flexible draw bar described in step 2 adopts cross support, and comer area lattice only establish a flexible draw bar;
Wherein, for considering rigidity and the space behavior of reactor wallboard in step 3, the stable of reactor wallboard need be ensured and there is predetermined rigidity; SCR denitration reactor wall plate thickness is set to 6mm, considers that the reduction of high temperature allowable working stresses of steel is more, and SCR denitration reactor sheet and timber matter adopt Q345B steel; For ensureing that SCR reactor wallboard has predetermined rigidity and margin of safety, need calculate according to load cross section model and the spacing of determining hoop reinforcing rib; It is that " large reinforcing rib " needs hoop border to arrange that SCR reactor-side wallboard reinforcing rib is arranged, adopt H profile steel, spacing is 3500mm, identical with SCR denitration reactor catalyst brace summer interlamellar spacing; " little reinforcing rib " adopts angle steel, and spacing is 700mm, but " little reinforcing rib " is by column bottom position, should encrypt according to stress analysis result.
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| CN112329307B (en) * | 2020-11-06 | 2021-10-15 | 大唐环境产业集团股份有限公司 | Intelligent calculation module and method of denitration reactor structure intelligent design system |
| CN114199311B (en) * | 2021-12-15 | 2023-11-14 | 江苏昆仑互联科技有限公司 | Intelligent dust accumulation measurement system and method for sintering flue gas SCR denitration system |
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| WO2008009049A1 (en) * | 2006-07-17 | 2008-01-24 | Commonwealth Scientific And Industrial Research Organisation | Co2 capture using solar thermal energy |
| CN102784558A (en) * | 2012-08-17 | 2012-11-21 | 中国大唐集团环境技术有限公司 | Denitrating reactor with shell of dual-layer steel plate structure |
| CN202762309U (en) * | 2012-08-17 | 2013-03-06 | 中国大唐集团环境技术有限公司 | Denitration reactor with double-layer steel plate casing |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008009049A1 (en) * | 2006-07-17 | 2008-01-24 | Commonwealth Scientific And Industrial Research Organisation | Co2 capture using solar thermal energy |
| CN102784558A (en) * | 2012-08-17 | 2012-11-21 | 中国大唐集团环境技术有限公司 | Denitrating reactor with shell of dual-layer steel plate structure |
| CN202762309U (en) * | 2012-08-17 | 2013-03-06 | 中国大唐集团环境技术有限公司 | Denitration reactor with double-layer steel plate casing |
Non-Patent Citations (2)
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| 浅谈脱硝反应器的钢结构设计;张铭;《中国建筑金属结构》;20130630;第32页 * |
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