CN211927417U

CN211927417U - Realize flue large-span sampling structure

Info

Publication number: CN211927417U
Application number: CN201922216567.3U
Authority: CN
Inventors: 汪朝伟; 李宝峰
Original assignee: Jiangsu Youerfu Electromechanical Technology Co ltd
Current assignee: Jiangsu Youerfu Electromechanical Technology Co ltd
Priority date: 2019-12-12
Filing date: 2019-12-12
Publication date: 2020-11-13
Anticipated expiration: 2029-12-12

Abstract

The utility model discloses a realize flue large-span sampling structure, including the support sleeve who spanes a plurality of parallels of flue, a plurality of support sleeve are located a cross section of flue, and support sleeve's one end is fixed with the flue inner wall, and the other end is reserved the interval between the flue inner wall that corresponds the end apart from, and this end hangs through the suspension member who fixes at the flue inner wall, perhaps the support member lifts, supports the intraductal coaxial sampling rod that can draw that is provided with of cover, the equidistance is provided with a plurality of sampling heads in the sampling rod. The utility model discloses a plurality of check points of evenly distributed on the cross section of flue, every sampling head connects a sample trachea respectively separately, and the sample trachea communicates the check out test set outside the flue, detects out the nitrogen content in the flue gas of each sampling head region one by one, really realizes that the flue divides the regional control. The sampling rod can be pulled out from the flue, the sampling head is replaced outside the flue, and the operability is high.

Description

Realize flue large-span sampling structure

Technical Field

The utility model relates to a realize flue large-span sampling structure belongs to the technical field of power plant's flue treatment facility.

Background

At present, the power generation amount of thermal power in China still accounts for 75% of the total power generation amount in China, so NOx (nitrogen oxides, which are collectively called as NO and NO mainly) generated in the thermal power industry₂) The emission amount occupies a major position in the total NOx emission amount in China, the strict control of the NOx emission of the thermal power plant is imperative, and the method is also based on the fact that the NOx emission standard of the thermal power plant is continuously improved in recent years in China.

SCR is a Selective Catalytic Reduction technology (Selective Catalytic Reduction), and an SCR flue gas denitration system adopts ammonia gas (NH)₃) As a reducing medium, the basic principle is that ammonia gas is sprayed into a flue, fully mixed with raw flue gas and then enters a reaction tower, and under the action of a catalyst and in the presence of oxygen, the ammonia gas selectively reacts with NOx in the flue gas to generate harmless nitrogen (N)₂) And water (H)₂O)。

Currently, the evaluation of the SCR effect is judged by a single point measurement of NOx at the SCR outlet. However, this approach does not yield the NOx non-uniformity from zoned ammonia injection.

Therefore, zoned measurements of NOx are being gradually undertaken within the industry to more fully evaluate SCR effectiveness. And the NOx value of each zone is fed back to the ammonia injection system to optimize the zone ammonia injection so as to further achieve the effects of emission reduction and energy conservation.

As can be seen from the SCR diagram, the measurement point for which the zoned NOx value is optimal is immediately below the lowermost catalyst layer before the narrowing of the flue. However, this position span is large in size. Considering the temperature of the flue gas (>300 ℃) and the scouring of the flue gas containing particles to the structure at high temperature and high speed, no scheme for grid partition sampling at the position exists at present.

The existing SCR outlet NOx zone sampling mode in the industry at present is as follows:

scheme 1: by sampling the side wall of the flue in different regions

In this way the sampling rod can only extend a limited distance into the flue (typically <2 metres) and therefore the NOx values obtained at the sampling points do not represent the difference between the position of the flue close to the wall and the position close to the centre, which difference is usually not negligible, as evidenced by practice.

Scheme 2: zonal sampling at reduced cross-sectional locations

By taking the flue size of 100 ten thousand units of a certain power plant as reference, the section of the catalyst layer is 10X13 m, the size after shrinkage is 3X4 m, and the area of the section is reduced to about 1/10. Therefore, the flue gas of different ammonia injection zones at different positions is reduced to be mixed, so that the zone NOx in the mode does not represent significance.

Scheme 3: large cross section grid sampling, but not zoned (on the same sampling rod)

Sampling is carried out by using a cross hollow sampling rod, and the side wall of the sampling rod is filled with sample gas. The sample gas obtained in this way is a mixture of a plurality of sampling points (the tangential flow cannot be leveled), and the partition data of each sampling point cannot be obtained.

Therefore, the prior art can not accurately monitor the denitrification effect of each area on the cross section and can not provide accurate dosage guidance for upstream ammonia injection.

Disclosure of Invention

In order to solve the technical problem, the utility model discloses a realize flue large-span sampling structure, its concrete technical scheme as follows:

the utility model provides a realize flue large-span sampling structure, includes the sampling rod of multistage axial concatenation, the concatenation department of sampling rod is provided with the sampling head, and the sample connection of every sampling head all is perpendicular with the air current direction of flue, and every sampling head is independent connects a respective sample trachea, and the sample trachea is coaxial to be located the sampling rod, and finally stretches out outside the flue, but the setting of sampling rod pull formula is on the support sleeve.

Further, the sampling head includes sampling pipe and the filter of setting in the sampling pipe, the sample connection has been seted up to sampling pipe one side, the sample connection link up with the air inlet of filter, and the filter is the cylindrical shape that the axial link up, the air inlet of filter is its axial one end, and the appearance gas pipe is connected to the lateral wall of filter.

Furthermore, the sampling tube is internally provided with a positioning device for fixing the sample tube and the filter, a group of opposite sides of the positioning device are axially provided with semicircular grooves capable of clamping the sample tube, a group of opposite sides of the middle part of the positioning device in the radial direction are provided with retaining rings with circular arc openings, the retaining rings surround the circumference of the filter, and the axial center of the positioning device is a through channel.

Furthermore, a circle of filter screen is arranged on the circumference of the filter, a space is reserved between the filter screen and the inner wall of the filter, and the sample gas pipe penetrates through the inner wall of the filter and is communicated with the space.

Furthermore, flanges are arranged at the two ends of the sampling pipe and the splicing ends of the sampling rod and the sampling pipe, and the sampling pipe and the sampling rod are connected and fixed by penetrating a plurality of screws through the flanges;

notches of a right-angled triangle are symmetrically formed in the horizontal two sides of the flange, one side of each notch is vertical, and the other side of each notch is horizontal;

the support sleeve comprises two side plates, a space is reserved between the side plates, the space is larger than the diameter of the sampling rod and smaller than the diameter of the flange, and the notch is erected on the side plates.

Further, reinforcing edges are horizontally and externally arranged at the bottom of the outer side and the position close to the upper part of the side plate, the side plate is formed by axially splicing a plurality of sections of side plates, a splicing seam is covered at the splicing position by using connecting plates, and the connecting plates at two sides of the splicing seam and the corresponding side plates are connected by using bolts;

the side plates are provided with a plurality of fixing rings in the axial direction, and the fixing rings surround the outer parts of the two side plates to connect and fix the two side plates.

Furthermore, a plurality of suspension mechanisms are further arranged outside the support sleeve, the upper portions of the suspension mechanisms are fixed with the support in the flue, and the lower ends of the suspension mechanisms drag the support sleeve.

The utility model discloses a theory of operation is:

the utility model discloses mainly be applied to in the great thermal power plant's of cross section flue for nitrogen content in the gas after detecting the ammonia of spouting and sell, according to the testing result, guide the ammonia quantity of spouting in the upper reaches, and the ammonia flow of spouting of each region of flue cross section.

When the cross section of the flue is large (such as 10 meters and 10 meters), in order to fully remove the pins of the gas in the flue, a plurality of regularly arranged ammonia spraying heads are arranged on the cross section in different areas, and the spraying areas of adjacent ammonia spraying heads are adjacent to each other, so that the whole gas flow section can be sprayed. In order to provide effectual effect feedback of coming out of stock for each ammonia spraying head, flue low reaches setting at cross-section such as the utility model discloses the structure, the distribution of sampling head is unanimous with the distribution of spraying the ammonia head, and the region that each sampling head detected is corresponding to the spraying area of an ammonia spraying head of its upper reaches, when a certain sampling head detects the nitrogen and exceeds standard, can in time feed back learn that it is that which ammonia spraying head in upper reaches spouts the ammonia not enough, perhaps the sampling head detects the nitrogen content and is less than the lower limit value, can in time feed back that it is that which ammonia spraying head in upper reaches spouts the ammonia excessively, in time take measures.

The utility model has the advantages that:

the utility model overcomes prior art can't realize with big cross-section flue in the difficult problem and the blank that the flue gas divides the regional detection, realize a plurality of check points of evenly distributed on the cross section of flue, every sampling head connects a appearance trachea respectively separately, and appearance trachea feeds through the check out test set outside the flue, detects out the nitrogen content in the flue gas of each sampling head region one by one, really realizes that the flue divides the regional control.

The utility model discloses a sampling rod can follow the pull play in the flue, changes the sampling head, realizes that the flue changes the sampling head outward, and maneuverability is strong.

The utility model discloses a sample connection is perpendicular with the interior gas flow direction of flue, and the flue gas enters into the filter through the mode of horizontal diffusion promptly, and then is sampled, avoids the air current directly to rush into the sampling head in, causes the dust deposit in the flue gas, effectively reduces the dust entering volume.

The utility model discloses a filter at first filters the dust in the flue gas, then carries out the appearance gas collection again, avoids the intraductal deposit dust of sampling.

Drawings

FIG. 1 is a schematic view of a conventional flue and a detection installation position

FIG. 2 shows the flue and the detection installation site of the present patent

With reference to the drawing, FIG. 3 shows the arrangement of the sampling rod of the present patent

FIG. 4 is a schematic view of a sampling rod of the present invention

FIG. 5 is a partial enlarged view at D of FIG. 4,

figure 6 is a schematic diagram of the structure of the sampling head of the patent,

figure 7 is an exploded view of the sampling head of this patent,

in the figure: 1-ammonia injection grid, 2-the layout position of scheme 1 in the background art, 3-the layout position of scheme 2 in the background art, 4-the layout position of scheme 3 in the background art, 5-flue, 6-support sleeve, A-the fixed end of support sleeve, B-the free end of support sleeve, A-support, 7-sampling head, 8-supporting member, 9-appearance gas pipe, 10-slide rail, 12-sampling rod, 13-sampling pipe, 14-flange, 15-installation cover, 16-air inlet, 17-breach, 18-filter, 19-positioner, 20-semicircular groove. -3-

Detailed Description

The present invention will be further clarified by the following description with reference to the attached drawings and specific examples, which should be understood as being merely illustrative of the present invention and not limiting the scope of the present invention, and modifications of various equivalent forms of the present invention by those skilled in the art after reading the present invention, all fall within the scope defined by the appended claims of the present application.

Fig. 1 is a diagram of arrangement positions of

schemes

1, 2 and 3 in a flue in the background art of the patent, a layout position 2 of the scheme 1 in the background art can only detect a single content at the inner wall of the flue and cannot reflect a flue gas state of the whole cross section, a layout position 3 of the scheme 2 in the background art is detected at a reduced section of the flue, flue gas is mixed and cannot visually reflect a distribution condition of ammonia injection pins at an ammonia injection grid 1 on the cross section, and a layout position 4 of the scheme 3 in the background art is at the flue with an equal cross section but only detects a flue gas condition on one straight line and cannot be equivalently paired with the ammonia injection grid 1. The arrangement position of this patent is the same with the position 4 that lays of scheme 3 in the background art, but forms the latticed distribution like fig. 4, and the point that detects is more, forms the equivalent pair with the distribution region of ammonia injection grid 1 of upstream, according to the flue gas testing result here, directly perceived a certain ammonia injection head that corresponds in ammonia injection grid 1, can refer to and the using value is higher.

As shown in fig. 2, which is a state diagram of the present invention in practical use, the bracket C in the figure is a conventional horizontal supporting mechanism in the flue. It is seen, a plurality of from the figure the utility model discloses a large-span sampling structure level sets up in the flue, realizes matrix formula multiple spot sampling in the flue for the test is more accurate to each region. The one end of support sleeve 6 is stiff end A, and is fixed with 5 inner walls of flue, and the other end is free end B, and this end is reserved the interval between 5 inner walls of flue, and this end is lifted through the supporting member who fixes 5 inner walls of flue, and supporting member 8 fixes inside 5 flue, can choose for use triangular supports structure, as shown in fig. 3 to set up the fence at both sides edge, prevent the slippage of sampling rod 12. The triangular support structure can be realized in two modes, for example, the inclined support of the triangle is positioned below the water support to play a supporting role, or the inclined support is positioned above the horizontal support to play a pulling role. In order to provide a stable connection of the support sleeve 6 to the flue 5, reinforcing ribs are fixedly connected both above and below it. The utility model discloses support sleeve and sampling rod all with reserve certain interval between the opposite flue inner wall, provide the surplus space of warping for it, when it is the thermal expansion in the flue gas, the free end extends forward, the flue wall of can not contradicting, the flue gas stops the back, receives cold shrink, the free end is withdrawed, also can not fall from the supporting component. The flue is not damaged.

The utility model discloses a concrete structure does: sampling rod 12 of multistage axial concatenation, the concatenation department of sampling rod 12 is provided with sampling head 7, and the both ends of sampling pipe 13 and the concatenation end of sampling rod 12 and sampling pipe 13 all are provided with flange 14, pass flange 14 through a plurality of screws and realize that the connection of sampling pipe 13 and sampling rod 12 is fixed. The sampling port of each sampling head 7 is vertical to the airflow direction of the flue 5, each sampling head 7 is independently connected with a respective sample gas pipe 9, the sample gas pipes 9 are coaxially positioned in the sampling rod 12 and finally extend out of the flue 5, and the sampling rod 12 is arranged on the support sleeve 6 in a drawing mode.

The structure of the pull sampling rod 12 is: notches 17 of a right triangle are symmetrically formed in the horizontal two sides of the flange 14, one side of each notch 17 is vertical, and the other side of each notch 17 is horizontal; the support sleeve 6 comprises two side plates, an interval is reserved between the side plates, the interval is larger than the diameter of the sampling rod 12 and smaller than the diameter of the flange 14, the notch 17 is erected on the side plates, the top of each side plate forms a sliding rail 12, and the sliding rail 12 and the notch are matched to form a drawable structure.

The outside bottom of curb plate and be close to upper portion position level and be provided with the reinforcement limit outward, the curb plate is formed by the concatenation of multistage curb plate axial, ensures to satisfy the demand of 5 large-spans in flue, uses the connecting plate to cover the concatenation seam in concatenation department to the connecting plate of bolted connection concatenation seam both sides and the curb plate that corresponds.

In order to fix the distance between the two side plates and prevent the two side plates from being loosened randomly, the side plates are provided with a plurality of fixing rings in the axial direction, and the fixing rings surround the outer parts of the two side plates and are fixedly connected with each other.

In order to ensure the stability of the support sleeve 6, a plurality of suspension mechanisms are arranged outside the support sleeve 6, the upper parts of the suspension mechanisms are fixed with a bracket in the flue 5, and the lower ends of the suspension mechanisms drag the support sleeve 6.

The sampling head 7 has the following specific structure: including sampling pipe 13 and the filter 18 of setting in sampling pipe 13, sampling mouth has been seted up to sampling pipe 13 one side, sampling mouth and filter 18's air inlet 16 link up, and filter 18 is the cylindrical shape that the axial link up, filter 18's air inlet 16 is its axial one end, and sample gas pipe 9 is connected to filter 18's lateral wall. The sampling tube 13 is internally provided with a positioning device 19 for fixing the sample gas tube 9 and the filter 18, a group of opposite sides of the positioning device 19 are axially provided with a semicircular groove 20 capable of clamping the sample gas tube 9, a group of opposite sides of the middle part of the positioning device 19 in the radial direction are provided with retaining rings with circular arc openings, the retaining rings surround the circumference of the filter 18, and the axial center of the positioning device 19 is a through channel. A circle of filter screens are arranged on the circumference of the filter 18, a space is reserved between each filter screen and the inner wall of the filter 18, and the sample gas pipe 9 penetrates through the inner wall of the filter 18 and is communicated with the space.

The sampling tube 13 has the following specific structure: sampling pipe 13 is the pipe shape, and the mounting hole has been seted up with the pipe wall perpendicularly to a set of opposite side of its axial, and the mounting hole is the rectangle, and the platform has been formed all around to the mounting hole, is provided with installation lid 15 in the mounting hole, and the sampling opening is seted up at installation lid 15 center, and the sampling opening is met the air current in the flue 5, and the gas outlet has been seted up at installation lid 15 center on the opposite side of sampling opening, and the both ends mouth of filter 18 aligns with air inlet 16 and gas outlet respectively. The mounting cap 15 is provided so that when the mounting cap 15 is opened to replace the filter 18, the filter 18 can be taken out of the sampling tube 13.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides a realize flue large-span sampling structure which characterized in that: the sampling rod comprises a plurality of sections which are axially spliced, sampling heads are arranged at the splicing positions of the sampling rods, the sampling ports of all the sampling heads are perpendicular to the airflow direction of the flue, each sampling head is independently connected with one sampling pipe, the sampling pipes are coaxially located in the sampling rods and finally extend out of the flue, and the sampling rods are arranged on the supporting sleeve in a pull mode.

2. The structure for realizing flue large-span sampling according to claim 1, wherein: the sampling head comprises a sampling pipe and a filter arranged in the sampling pipe, a sampling port is formed in one side of the sampling pipe, the sampling port is communicated with an air inlet of the filter, the filter is in a cylindrical shape communicated in the axial direction, the air inlet of the filter is one axial end of the filter, and a sample gas pipe is connected to the side wall of the filter.

3. The structure for realizing flue large-span sampling according to claim 2, wherein: the sampling tube is internally provided with a positioning device used for fixing a sample gas tube and a filter, a group of opposite sides of the positioning device are axially provided with semicircular grooves capable of clamping the sample gas tube, a group of opposite sides of the radial direction of the middle part of the positioning device are provided with retaining rings with circular arc openings, the retaining rings surround the circumference of the filter, and the axial center of the positioning device is a through channel.

4. The structure for realizing flue large-span sampling according to claim 3, wherein: the circumference of the filter is provided with a circle of filter screens, a space is reserved between each filter screen and the inner wall of the filter, and the sample gas pipe penetrates through the inner wall of the filter and is communicated with the space.

5. The structure for realizing flue large-span sampling according to claim 2, wherein: flanges are arranged at the two ends of the sampling pipe and the splicing ends of the sampling rod and the sampling pipe, and the sampling pipe and the sampling rod are connected and fixed by a plurality of screws penetrating through the flanges;

6. The structure for realizing flue large-span sampling according to claim 5, wherein: reinforcing edges are horizontally and externally arranged at the bottom of the outer side and the position close to the upper part of the side plate, the side plate is formed by axially splicing a plurality of sections of side plates, a splicing seam is covered at the splicing position by using connecting plates, and the connecting plates at two sides of the splicing seam and the corresponding side plates are connected by using bolts;

7. The structure for realizing flue large-span sampling according to claim 6, wherein: the outside of the support sleeve is also provided with a plurality of suspension mechanisms, the upper parts of the suspension mechanisms are fixed with a support in the flue, and the lower ends of the suspension mechanisms drag the support sleeve.