CN115355519A - Wide load denitration entry gas temperature regulation and control system of coal fired boiler - Google Patents
Wide load denitration entry gas temperature regulation and control system of coal fired boiler Download PDFInfo
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- CN115355519A CN115355519A CN202210997214.5A CN202210997214A CN115355519A CN 115355519 A CN115355519 A CN 115355519A CN 202210997214 A CN202210997214 A CN 202210997214A CN 115355519 A CN115355519 A CN 115355519A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J13/00—Fittings for chimneys or flues
- F23J13/08—Doors or covers specially adapted for smoke-boxes, flues, or chimneys
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L17/00—Inducing draught; Tops for chimneys or ventilating shafts; Terminals for flues
- F23L17/02—Tops for chimneys or ventilating shafts; Terminals for flues
- F23L17/14—Draining devices
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Abstract
The invention discloses a wide-load denitration inlet smoke temperature control system of a coal-fired boiler, which comprises an economizer flue gas bypass flue, an economizer outlet flue and a denitration inlet flue, wherein the inlet of the economizer flue gas bypass flue is connected with an economizer upstream main flue, the outlet of the economizer flue gas bypass flue is connected with an economizer outlet flue through a gradually-expanded flow equalizer, and the economizer outlet flue is connected with the denitration inlet flue; a resistance regulator is arranged on the outlet flue of the economizer and is positioned at the upstream of the gradually-expanding flow equalizer; a depth direction cross mixer is arranged in the denitration inlet flue, and a smoke temperature measuring point is arranged on the inner side of the denitration inlet flue at least two meters at the downstream of the depth direction cross mixer; and adjusting the opening and closing degree of the resistance regulator according to the measured value of the smoke temperature measuring point, so as to realize the adjustment of the ratio of the main smoke flow in the outlet flue of the economizer and the bypass smoke flow in the bypass flue of the economizer. The invention facilitates the control of the temperature in the denitration inlet flue and ensures the uniformity of the flue gas in different dimensional temperature fields and flow fields.
Description
Technical Field
The invention relates to a coal-fired boiler wide-load denitration inlet smoke temperature control system, and belongs to the technical field of denitration of coal-fired power stations.
Background
At present, an SCR denitration device is generally adopted by a large coal-fired power plant to reduce the NOx emission concentration in flue gas. SCR utilization of NH 3 The reduction characteristic of NOx is that NOx is reduced into N harmless to environment under the action of catalyst 2 And H 2 O。
The denitration catalyst is arranged in the SCR denitration device, the inlet smoke temperature generally requires 300-400 ℃, the too low or too high smoke temperature can lead to the permanent inactivation of the catalyst, the service life of the catalyst is reduced, and therefore the smoke temperature of the SCR denitration device is required to be ensured to be in a designed temperature window.
Under the background of double carbon targets, a coal-fired unit needs to operate under a wide load, deep peak regulation is frequently carried out, in order to ensure that the denitration inlet smoke temperature meets the lower limit requirement of the use temperature of a catalyst during low-load operation, a coal-fired boiler is generally provided with a coal economizer smoke bypass flue, high-temperature smoke with the temperature of more than 400 ℃ is introduced from the front of an economizer and mixed with low-temperature smoke in an outlet flue of the economizer, and the smoke temperature in the denitration inlet flue is improved to meet the requirement.
However, in actual operation, the flow rate of flue gas generated by the coal-fired boiler is small at low load, the resistance of the economizer is relatively small, the flow rate of high-temperature flue gas flowing in a flue gas bypass flue of the economizer is also reduced rapidly, and the temperature of the high-temperature flue gas is not high enough, so that the average flue gas temperature after the high-temperature flue gas and the low-temperature flue gas are mixed still does not meet the use temperature requirement of the denitration catalyst, the high-temperature flue gas introduced into an outlet flue of the economizer is generally concentrated at a position on the middle of a confluence part, and the flue gas temperature and the flue gas flow along the width direction or the depth direction of the flue gas are not uniform, so that the escape of flue gas denitration ammonia at low load is large, and dust is accumulated on equipment such as a downstream air preheater, a dust remover and the like.
Disclosure of Invention
The invention provides a coal-fired boiler wide-load denitration inlet flue gas temperature regulation and control system, which improves the denitration inlet flue gas temperature regulation amplitude during deep peak regulation of a coal-fired boiler, and simultaneously improves the temperature field and flow field uniformity of flue gas in a denitration inlet flue in two dimensions of width and depth.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a coal-fired boiler wide-load denitration inlet smoke temperature control system comprises an economizer flue gas bypass flue, an economizer outlet flue and a denitration inlet flue, wherein the inlet of the economizer flue gas bypass flue is connected with an economizer upstream main flue, the outlet of the economizer flue gas bypass flue is connected with the economizer outlet flue, the economizer outlet flue is connected with the denitration inlet flue, and the outlet of the economizer flue gas bypass flue is connected with the economizer outlet flue through a gradually-expanded flow equalizer; the economizer outlet flue is provided with a resistance regulator, the resistance regulator is positioned at the upper stream of the junction of the gradually-expanding flow equalizer and the economizer outlet flue, the resistance regulator is of a spile door structure, a spile used by the spile door structure is a porous plate, and the porous plate can be lifted upwards to be completely separated from a main flue gas flowing area in the economizer outlet flue and can also be moved downwards to completely cover the main flue gas flowing area in the economizer outlet flue; a depth direction cross mixer is arranged in the denitration inlet flue, and a smoke temperature measuring point is arranged on the inner side of the denitration inlet flue at least two meters at the downstream of the depth direction cross mixer; according to the measured value of the smoke temperature measuring point, the opening degree of the resistance regulator is adjusted, namely the opening degree of the inserting plate door structure is adjusted, so that the proportion of the main smoke flow in the outlet flue of the economizer and the bypass smoke flow in the bypass flue of the economizer is adjusted, and the smoke temperature at the denitration inlet is adjusted.
The resistance regulator is of a spile door structure. The inserting plate can move up and down under the driving of the actuating mechanism, and the inserting plate can be completely lifted to be separated from a main flue gas flowing area of an outlet flue of the economizer. When the denitration entry flue gas temperature satisfies the requirement, the picture peg promotes completely and breaks away from economizer export flue main flue gas flow region, and the resistance regulator does not have the wearing and tearing scheduling problem this moment, is favorable to furthest extension resistance regulator life to promote its reliability.
The applicant finds that by arranging the resistance regulator at the upstream of the junction of the economizer flue gas bypass flue and the economizer outlet flue, the resistance of main flue gas flowing in the economizer outlet flue is increased, the flow of bypass flue gas in the economizer flue gas bypass flue can be greatly increased, and the average temperature of the flue gas at the denitration inlet is greatly increased; the inserting plate used by the inserting plate door is of a porous plate structure, so that the uniformity of a flow field at a denitration inlet can be improved, and eddy current formed behind the inserting plate is avoided; the denitration inlet flue temperature field and flow field uniformity along the width direction are improved by additionally arranging the width direction gradually-expanding flow equalizer, the denitration inlet flue temperature field and flow field uniformity along the depth direction are improved by additionally arranging the depth direction crossed mixer, and the adverse effect of adding a throttling element to the economizer outlet flue and introducing bypass flue gas to the denitration inlet flow field is eliminated. Through the combination of a plurality of technical characteristics, the wide regulation characteristic of denitration inlet flue gas temperature is guaranteed, and the influence on the uniformity of a denitration inlet temperature field and a denitration inlet flow field is extremely small in the regulation process, so that good conditions are created for the efficient operation of a denitration device.
The direction of this application upstream to low reaches is unanimous with the main direction of flow of flue gas.
This application cigarette temperature measurement point is equipped with temperature detector for survey the inboard temperature of flue.
When the temperature detected by the smoke temperature measuring point is lower than a design value, the height of the plug board of the resistance regulator is reduced, the flowing resistance of the main smoke in the outlet flue of the economizer is increased, and the flow of the bypass smoke in the bypass flue of the smoke of the economizer is increased, so that the average temperature of the smoke at the denitration inlet in the denitration inlet flue is increased; when the temperature detected by the smoke temperature measuring point is higher than a designed value, the height of the inserting plate of the resistance regulator is increased, the flowing resistance of the main smoke in the outlet flue of the economizer is reduced, the flow of the bypass smoke in the bypass flue of the smoke of the economizer is reduced, and therefore the average temperature of the smoke at the denitration inlet in the flue of the denitration inlet is reduced.
In order to better take account of the temperature control effect and the homogenization effect, the opening ratio of the inserting plate used by the inserting plate door structure is between 30 and 70 percent. The shape of the through holes on the plug board is not particularly limited, but the through holes are uniformly distributed on the plug board.
As one of them concrete implementation scheme, the used picture peg of picture peg door structure is double-deck perforated plate, and double-deck perforated plate is the staggered arrangement of hole, and the through-hole on the double-deck perforated plate also is the staggered arrangement, can control double-deck perforated plate's opening degree as required, further improves the controllability of temperature like this.
In order to simplify the structure and simultaneously achieve the homogenization effect, the gradually-expanded flow equalizer is of a tubular structure with gradually-expanded width in the direction from the inlet to the outlet of the gradually-expanded flow equalizer, the inlet of the gradually-expanded flow equalizer is equal to the size of the outlet of the flue gas bypass flue of the coal economizer and is communicated in a butt joint mode, the outlet of the gradually-expanded flow equalizer is communicated with the side wall of the flue gas outlet of the coal economizer, and the outlet width of the gradually-expanded flow equalizer is equal to the width of the flue gas outlet of the coal economizer.
In order to further improve the homogenization effect, the inner side wall of the gradually-expanding flow equalizer is provided with drainage plates which are arranged along the height direction and are distributed in an umbrella shape. The drainage plate is the distribution structure that from the top down diffuses gradually, can make the flue gas in the economizer flue gas bypass flue evenly diffuse to economizer export flue width direction along the drainage plate like this, and then promote denitration entry flue along width direction temperature field and flow field homogeneity.
In order to facilitate installation and ensure the homogenization effect, the included angle between the side wall of the divergent homogenizer and the horizontal direction is 30-60 degrees.
As a specific implementation, it is necessary to provide a depth-wise cross mixer including a first separator plate group, a second separator plate group, and a third separator plate group; the first partition plate group comprises at least 12 first partition plates with the same structure, all the first partition plates are vertically arranged at the same height in the denitration inlet flue in parallel, in the same end position and at equal intervals, and two ends of the first partition plates in the length direction are connected with the inner side wall of the denitration inlet flue; a second partition plate group or a third partition plate group is arranged between two adjacent first partition plates, and the second partition plate groups and the third partition plate groups are arranged at intervals; every second baffle group is including parallel arrangement's more than two second baffles, and two adjacent first baffles are connected respectively to the both sides of second baffle, and every third baffle group is including parallel arrangement's more than two third baffles, and two adjacent first baffles are connected respectively to the both sides of third baffle. Therefore, after the flue gas is divided by the first partition plate group and is crossed and mixed by the second partition plate group and the third partition plate group, the uniformity of a flue gas temperature field and a flue gas flow field in the depth direction is better ensured.
The above-mentioned cross mixer of depth direction covers the whole cross-section in the denitration inlet flue to guarantee the homogenization effect better.
The first partition plates are arranged in parallel, flush and vertically at equal intervals at the same height in the denitration inlet flue, and the first partition plates are parallel to each other and have equal intervals, the end parts of all the first partition plates are flush, and the surfaces of the first partition plates are parallel to the vertical direction; the height direction of the first partition boards is consistent with the vertical direction, the length direction of the first partition boards is perpendicular to the height direction, and all the first partition boards are located at the same height.
The second separator plate group and the third separator plate group are arranged at intervals, namely the second separator plate group, the third separator plate group, the second separator plate group, the third separator plate group … … and the like.
In order to improve the uniformity of cross mixing, the included angles between the second partition plate and the first partition plate and between the third partition plate and the first partition plate are both 45-75 degrees, and the inclination directions of the second partition plate and the third partition plate are opposite.
For the installation of convenient second baffle and third baffle, the last side of first baffle is the cockscomb structure, and the inclination of sawtooth is the same with the inclination of second baffle and third baffle, and the both sides of second baffle and third baffle are equallyd divide and are installed on the inclined plane of two adjacent first baffle sawtooth by closing respectively.
The prior art is referred to in the art for techniques not mentioned in the present invention.
According to the wide-load denitration inlet smoke temperature regulation and control system for the coal-fired boiler, the resistance of the resistance regulator is regulated according to the measured value of the smoke temperature measuring point, the ratio of the main smoke flow in the outlet flue of the economizer and the bypass smoke flow in the bypass flue of the economizer is regulated, and the denitration inlet smoke temperature regulation amplitude during the deep peak regulation of the coal-fired boiler is improved; meanwhile, the uniformity of two dimensional temperature fields and flow fields of the flue gas in the denitration inlet flue on the plane is improved through the arrangement of the gradually-expanding flow equalizer and the depth-direction crossed mixer.
Drawings
Fig. 1 is a schematic diagram of a typical arrangement of a denitration inlet section in the prior art.
Fig. 2 isbase:Sub>A schematic sectional view taken along linebase:Sub>A-base:Sub>A in fig. 1.
FIG. 3 is a schematic diagram of the denitration inlet section in the embodiment of the present invention.
Fig. 4 is a schematic cross-sectional view of B-B in fig. 3.
FIG. 5 is a three-dimensional view of a depth-wise cross mixer in an embodiment of the invention.
FIG. 6 is a schematic diagram of an embodiment of a resistance regulator with an insert plate opening configuration.
In the figure, 1 is an economizer, 2 is an economizer flue gas bypass flue, 3 is an economizer outlet flue, 4 is a denitration inlet flue, 5 is a resistance regulator, 6 is a gradually-expanding flow equalizer, 7 is a depth direction cross mixer, 71 is a first partition plate, 72 is a second partition plate, 73 is a third partition plate, and 8 is a smoke temperature measuring point.
Detailed Description
For better understanding of the present invention, the following examples are given for further illustration of the present invention, but the present invention is not limited to the following examples.
The terms of the upper, lower, left, right, horizontal, vertical, width, height and other directions in the application are all relative directions or position relationships based on the drawings, and should not be construed as absolute limitations of the application. The communicating means of the present application are connected and communicated;
example 1
As shown in fig. 3-4, a coal-fired boiler wide-load denitration inlet flue gas temperature control system comprises an economizer flue gas bypass flue, an economizer outlet flue and a denitration inlet flue, wherein an inlet of the economizer flue gas bypass flue is communicated with a main flue at the upper part of an economizer, an outlet of the economizer flue gas bypass flue is communicated with the economizer outlet flue through a gradually-expanded equalizer, the economizer outlet flue is communicated with the denitration inlet flue, the gradually-expanded equalizer is of a tubular structure with gradually-expanded width from the inlet to the outlet of the expanded equalizer as shown in fig. 3, the inlet of the gradually-expanded equalizer is equal in size and in butt communication with the outlet of the economizer flue gas bypass flue, an outlet of the gradually-expanded equalizer is communicated with the side wall of the economizer outlet flue, the outlet width of the gradually-expanded equalizer is equal to the width of the economizer outlet flue, a drainage plate which is arranged along the height direction and is distributed like an umbrella is arranged on the inner side wall of the gradually-expanded equalizer, and an included angle between the side wall of the gradually-expanded equalizer and the horizontal direction is 45 degrees (through practice, values of 40 degrees, 50 degrees, 60 degrees and the like can also meet the homogenization requirements of the field; the resistance regulator is arranged on the exit flue of the economizer and is positioned at the upper stream of the junction of the gradually-expanding flow equalizer and the exit flue of the economizer, the resistance regulator is of a spile door structure, the spile can be driven by an actuating mechanism to move up and down, and can be completely lifted and separated from the main flue gas flowing area of the exit flue of the economizer, when the temperature of the denitration inlet smoke meets the requirement, the spile can be completely lifted and separated from the main flue gas flowing area of the exit flue of the economizer, and at the moment, the resistance regulator has no problems of abrasion and the like, so that the service life of the resistance regulator can be prolonged to the maximum extent, and the reliability of the resistance regulator can be improved; the inserting plate used in the inserting plate door structure is a porous plate, so that the uniformity of a flow field at a denitration inlet can be improved, and eddy current formed behind the inserting plate is avoided; a depth direction cross mixer is arranged in the denitration inlet flue, and a smoke temperature measuring point is arranged on the inner side of the denitration inlet flue at least two meters downstream of the depth direction cross mixer; according to the measured value of the smoke temperature measuring point, the resistance of the resistance regulator is adjusted, namely the opening and closing degree of the inserting plate door structure is adjusted, so that the proportion of the main smoke flow in the outlet flue of the economizer and the bypass smoke flow in the bypass flue of the economizer is adjusted, and the smoke temperature at the denitration inlet is adjusted and controlled.
When the temperature detected by the smoke temperature measuring point is lower than a design value, the height of the plug board of the resistance regulator is reduced, the flowing resistance of the main smoke in the outlet flue of the economizer is increased, and the flow of the bypass smoke in the bypass flue of the smoke of the economizer is increased, so that the average temperature of the smoke at the denitration inlet in the denitration inlet flue is increased; when the temperature detected by the smoke temperature measuring point is higher than a designed value, the height of the inserting plate of the resistance regulator is increased, the flowing resistance of the main smoke in the outlet flue of the economizer is reduced, the flow of the bypass smoke in the bypass flue of the smoke of the economizer is reduced, and therefore the average temperature of the smoke at the denitration inlet in the flue of the denitration inlet is reduced.
Example 2
On the basis of the embodiment 1, the following improvements are further made: as shown in fig. 6, the inserting plate used in the inserting plate door structure is provided with uniformly distributed round holes, and the opening rate is 50%.
Example 3
On the basis of the embodiment 2, the following improvements are further made: the used picture peg of picture peg door structure is double-deck perforated plate, and double-deck perforated plate is the staggered arrangement, and the through-hole on the double-deck perforated plate also is the staggered arrangement, can control double-deck perforated plate's opening degree as required, further improves the controllability of temperature like this.
Example 4
On the basis of the embodiment 2, the following improvements are further made: as shown in fig. 3, the depth-wise cross mixer covers the entire cross section in the denitration inlet flue, and as shown in fig. 5, the depth-wise cross mixer includes a first partition plate group, a second partition plate group, and a third partition plate group; the first partition plate group comprises at least 12 first partition plates with the same structure, all the first partition plates are vertically arranged at the same height in the denitration inlet flue in parallel, in a flush manner and at equal intervals, and two ends of each first partition plate in the length direction are connected with the inner side wall of the denitration inlet flue; a second partition plate group or a third partition plate group is arranged between two adjacent first partition plates, and the second partition plate groups and the third partition plate groups are arranged at intervals; each second partition plate group comprises more than two parallel second partition plates, two sides of each second partition plate are respectively connected with two adjacent first partition plates, each third partition plate group comprises more than two parallel third partition plates, and two sides of each third partition plate are respectively connected with two adjacent first partition plates; the included angles between the second clapboard and the first clapboard and between the third clapboard and the first clapboard are both 50-70 degrees, and the inclination directions of the second clapboard and the third clapboard are opposite. Therefore, after the flue gas is divided by the first partition plate group and is crossed and mixed by the second partition plate group and the third partition plate group, the uniformity of a flue gas temperature field and a flue gas flow field in the depth direction is better ensured.
Example 5
On the basis of the embodiment 4, the following improvements are further made: for the installation of convenient second baffle and third baffle, the last side of first baffle is the cockscomb structure, and the inclination of sawtooth is the same with the inclination of second baffle and third baffle, and the both sides of second baffle and third baffle are equallyd divide and are installed on the inclined plane of two adjacent first baffle sawtooth by closing respectively.
The invention is a great improvement to the bypass flue system of the coal-fired boiler economizer of the tradition, the tradition technology can only promote the denitration inlet smoke temperature about 30 ℃, but adopt the scheme of the above example, through the trial operation of engineering practice, the denitration inlet smoke temperature has the ability of promoting 60-100 ℃, in each load section of the normal operation of the coal-fired boiler, the denitration inlet smoke temperature can be kept between 300-400 ℃, and the uneven coefficient of the first layer catalyst section temperature field and the velocity field of the denitration inlet can be controlled within 0.1, thus creating good conditions for strictly controlling the full load ammonia escape within 3 ppm.
Comparative example 1
Essentially the same as in example 5, except that: when in engineering installation, the divergent flow equalizer is omitted. Through trial operation, although the denitration inlet flue gas temperature has the capacity of increasing 60-100 ℃, the uneven coefficient of the first-layer catalyst section temperature field and the speed field at the denitration inlet is larger than 0.2, and the main width direction is uneven.
Comparative example 2
Essentially the same as in example 2, except that: during engineering installation, a depth direction crossed mixer is omitted. Through trial operation, although the denitration inlet smoke temperature has the capacity of increasing 60-100 ℃, the uneven coefficient of the first-layer catalyst section temperature field and the speed field at the denitration inlet is larger than 0.3, and the main depth direction is uneven.
Comparative example 3
Essentially the same as in example 5, except that: and replacing the inserting plate with the non-porous plate. Through trial operation, although the denitration inlet flue gas temperature has the capacity of increasing 60-100 ℃, the uneven coefficients of a temperature field and a velocity field of the section of the first-layer catalyst at the denitration inlet are larger than 0.2, and the flow field characteristics are unstable due to the fact that a large vortex is formed after the plate inserting.
It can be seen from the above examples that the uniformity of the cross-sectional temperature field and the velocity field of the first-layer catalyst at the denitration inlet can be significantly improved by the cooperation and promotion of the divergent flow equalizer, the depth direction crossed mixer and the spile gate structure of the porous plate.
Claims (10)
1. The utility model provides a wide load denitration entry gas temperature regulation and control system of coal fired boiler, includes economizer flue gas bypass flue, economizer export flue and denitration entry flue, economizer flue gas bypass flue access connection economizer upper reaches flue, exit linkage economizer export flue, economizer export flue and denitration entry flue are connected its characterized in that: the outlet of the flue gas bypass flue of the economizer is connected with the outlet flue of the economizer through a gradually-expanding flow equalizer; the economizer outlet flue is provided with a resistance regulator, the resistance regulator is positioned at the upper stream of the junction of the gradually-expanding flow equalizer and the economizer outlet flue, the resistance regulator is of a spile door structure, a spile used by the spile door structure is a porous plate, and the porous plate can be lifted upwards to be completely separated from a main flue gas flowing area in the economizer outlet flue and can also be moved downwards to completely cover the main flue gas flowing area in the economizer outlet flue; a depth direction cross mixer is arranged in the denitration inlet flue, and a smoke temperature measuring point is arranged on the inner side of the denitration inlet flue at least two meters at the downstream of the depth direction cross mixer; and adjusting the opening and closing degree of the resistance regulator according to the measured value of the smoke temperature measuring point, so as to realize the adjustment of the ratio of the main smoke flow in the outlet flue of the economizer and the bypass smoke flow in the bypass flue of the smoke of the economizer, and regulate and control the smoke temperature at the denitration inlet.
2. The coal-fired boiler wide-load denitration inlet flue gas temperature regulation and control system as claimed in claim 1, characterized in that: when the temperature detected by the smoke temperature measuring point is lower than a design value, the height of the plug board of the resistance regulator is reduced, the flowing resistance of the main smoke in the outlet flue of the economizer is increased, and the flow of the bypass smoke in the bypass flue of the smoke of the economizer is increased, so that the average temperature of the smoke at the denitration inlet in the denitration inlet flue is increased; when the temperature detected by the smoke temperature measuring point is higher than a designed value, the height of the inserting plate of the resistance regulator is increased, the flowing resistance of the main smoke in the outlet flue of the economizer is reduced, the flow of the bypass smoke in the bypass flue of the smoke of the economizer is reduced, and therefore the average temperature of the smoke at the denitration inlet in the flue of the denitration inlet is reduced.
3. The coal-fired boiler wide-load denitration inlet flue gas temperature regulation and control system as claimed in claim 1 or 2, characterized in that: the opening rate of the flashboard used by the flashboard door structure is between 30 and 70 percent.
4. The coal-fired boiler wide-load denitration inlet flue gas temperature regulation and control system as claimed in claim 1 or 2, characterized in that: the inserting plate used in the inserting plate door structure is a double-layer porous plate, and the double-layer porous plate is arranged in staggered holes.
5. The coal-fired boiler wide-load denitration inlet flue gas temperature control system of claim 1 or 2, characterized in that: the gradually-expanded flow equalizer is a tubular structure with gradually-expanded width in the direction from the inlet to the outlet of the gradually-expanded flow equalizer, the inlet of the gradually-expanded flow equalizer is equal to the size of the outlet of the flue gas bypass flue of the coal economizer and is in butt joint communication with the outlet of the flue gas bypass flue of the coal economizer, the outlet of the gradually-expanded flow equalizer is communicated with the side wall of the flue gas outlet of the coal economizer, and the outlet width of the gradually-expanded flow equalizer is equal to the width of the flue gas outlet of the coal economizer.
6. The coal-fired boiler wide-load denitration inlet flue gas temperature regulation and control system as claimed in claim 1 or 2, characterized in that: the inner side wall of the gradually-expanding flow equalizer is provided with a drainage plate which is arranged along the height direction and is distributed like an umbrella.
7. The coal-fired boiler wide-load denitration inlet flue gas temperature control system of claim 1 or 2, characterized in that: the included angle between the side wall of the divergent flow equalizer and the horizontal direction is 30-60 degrees.
8. The coal-fired boiler wide-load denitration inlet flue gas temperature regulation and control system as claimed in claim 1 or 2, characterized in that: the depth direction cross mixer comprises a first partition plate group, a second partition plate group and a third partition plate group; the first partition plate group comprises at least 12 first partition plates with the same structure, all the first partition plates are vertically arranged at the same height in the denitration inlet flue in parallel, in a flush manner and at equal intervals, and two ends of each first partition plate in the length direction are connected with the inner side wall of the denitration inlet flue; a second partition plate group or a third partition plate group is arranged between two adjacent first partition plates, and the second partition plate groups and the third partition plate groups are arranged at intervals; every second baffle group is including parallel arrangement's more than two second baffles, and two adjacent first baffles are connected respectively to the both sides of second baffle, and every third baffle group is including parallel arrangement's more than two third baffles, and two adjacent first baffles are connected respectively to the both sides of third baffle.
9. The coal fired boiler wide load denitration inlet flue gas temperature regulation and control system of claim 8, characterized in that: the included angles between the second clapboard and the first clapboard as well as between the third clapboard and the first clapboard are both 45-75 degrees, and the inclination directions of the second clapboard and the third clapboard are opposite.
10. The coal fired boiler wide load denitration inlet flue gas temperature regulation and control system of claim 9, characterized in that: the last side of first baffle is the cockscomb structure, and the inclination of sawtooth is the same with the inclination of second baffle and third baffle, and the both sides of second baffle and third baffle are equallyd divide and are installed on the inclined plane of two adjacent first baffle sawtooth by closing respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210997214.5A CN115355519A (en) | 2022-08-19 | 2022-08-19 | Wide load denitration entry gas temperature regulation and control system of coal fired boiler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210997214.5A CN115355519A (en) | 2022-08-19 | 2022-08-19 | Wide load denitration entry gas temperature regulation and control system of coal fired boiler |
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| Publication Number | Publication Date |
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| CN115355519A true CN115355519A (en) | 2022-11-18 |
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| CN202210997214.5A Pending CN115355519A (en) | 2022-08-19 | 2022-08-19 | Wide load denitration entry gas temperature regulation and control system of coal fired boiler |
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2022
- 2022-08-19 CN CN202210997214.5A patent/CN115355519A/en active Pending
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