CN218107276U - Safety device for oxidizing air system in wet desulphurization process - Google Patents
Safety device for oxidizing air system in wet desulphurization process Download PDFInfo
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- CN218107276U CN218107276U CN202222143087.0U CN202222143087U CN218107276U CN 218107276 U CN218107276 U CN 218107276U CN 202222143087 U CN202222143087 U CN 202222143087U CN 218107276 U CN218107276 U CN 218107276U
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Abstract
The utility model provides a safety device for oxidation wind system among wet flue gas desulfurization technology, every oxidation wind of oxidation wind system is responsible for and is connected a plurality of oxidation wind branch pipes, and every oxidation wind branch pipe is responsible for with oxidation wind's link and is the air intake, and the liquid seal pipe is installed to the other end of oxidation wind branch pipe, sets up a plurality of oxidation wind exhaust vents on the pipeline of every oxidation wind branch pipe, sets up the pressurize subassembly on partial oxidation wind exhaust vent. The utility model arranges different pressure maintaining pipes on the air outlet of the oxidation air branch pipe, changes the original air pressure area, satisfies the adaptability problem of the oxidation fan under high and low load, not only plays the role of high-pressure and low-pressure protection, but also improves the air distribution uniformity of the oxidation air; the problem of desulfurization slurry oxidation unevenness caused by the blockage of the oxidation air branch pipe is effectively avoided, the further rise of the oxidation air pressure caused by the blockage of the air pipe is effectively prevented, and the operation safety and the economical efficiency of the oxidation fan are guaranteed.
Description
Technical Field
The utility model relates to a safety device for an oxidizing air system in a wet desulphurization process, which belongs to the technical field of wet desulphurization equipment.
Background
The oxidation of sulfite is an important reaction in the limestone-gypsum wet desulphurization process, and the dissolved oxygen in the slurry of the absorption tower oxidizes sulfite into sulfate, which is finally crystallized and separated out in the form of gypsum, thereby playing an important role in the quality of the desulphurization slurry, the desulphurization efficiency and the gypsum quality. The oxidation system of the limestone-gypsum wet desulphurization facility adopts a forced oxidation process, the dissolved oxygen in the desulphurization slurry mainly comes from the oxidation air sprayed into the oxidation zone of the absorption tower, and the safe and economic operation of the wet desulphurization is adversely affected by insufficient or excessive oxidation air or uneven distribution of the oxidation air.
When desulfurization oxidation tuber pipe was the pipe network formula oxidation tuber pipe, in order to avoid the exhaust vent to block up, the oxidation fan must continuous operation, often chooses roots's fan for use as the oxidation fan, but its output amount of wind can not be adjusted, can't realize the accurate regulation and control of the oxidation amount of wind. Under the large background of deep peak shaving of a coal-fired unit, the unit load fluctuation range is large and frequent, the output of the desulfurization oxidation fan is difficult to linearly adjust through the unit load and the change of the sulfur content of flue gas, and the rated output is still kept under low load, so that the operation economy of the oxidation fan is poor, and the desulfurization oxidation fan is one of high-energy consumption devices of a desulfurization facility. In order to reduce oxidation fan energy consumption, the prior art adopts the roots fan to increase modes such as converter or magnetic suspension frequency conversion centrifugal fan replace roots fan and reforms transform, but the problem that nevertheless brings from this is: after the oxidation fan is reformed, under the low-load, the running characteristics of an oxidation air pipe and the oxidation fan are not matched, namely: under the unit low-load, after the oxidation air supply volume is reduced, the oxidation air branch pipe cannot maintain pressure, slurry flows backwards, and the potential safety hazard of the operation of a desulfurization facility is caused, so that the frequency adjustment of the oxidation fan is limited and cannot be too low, and the energy saving rate of the oxidation fan is influenced. Therefore, the technical improvement has the contradiction between safety and energy-saving effect.
Therefore, how to avoid the back flow and blockage of the slurry of the oxidation air pipe in the low-frequency (low-flow and low-pressure head) running process of the desulfurization oxidation fan is a technical problem to be solved urgently in the energy-saving process of the desulfurization oxidation air system.
Disclosure of Invention
In order to overcome the defects of the prior art, the utility model provides a safety device for an oxidation air system in a wet desulphurization process, which is used for solving the safety problems of backflow and blockage of the slurry of an oxidation air pipe caused by insufficient air pressure when a limestone-gypsum wet desulphurization oxidation fan operates at low frequency (low flow and low pressure head).
In order to realize the technical purpose, the utility model provides a safety device for oxidation wind system among wet flue gas desulfurization technology, every oxidation wind of oxidation wind system is responsible for and is connected a plurality of oxidation wind branch pipes, and every oxidation wind branch pipe is responsible for with oxidation wind's link is the air intake, and the liquid seal pipe is installed to the other end of oxidation wind branch pipe, sets up a plurality of oxidation wind exhaust vents on the pipeline of every oxidation wind branch pipe, sets up the pressurize subassembly on partial oxidation wind exhaust vent.
Further, the pressure maintaining assembly comprises a high-pressure maintaining pipe, a medium-pressure maintaining pipe and a low-pressure maintaining pipe, wherein the high-pressure maintaining pipe is arranged on a pipeline between the air inlet and the liquid seal pipe and on an air outlet hole close to the air inlet side; the medium-pressure-maintaining pipe is arranged on a part of the air outlet hole close to the side of the liquid seal pipe; the low-pressure maintaining pipe is arranged on a part of the air outlet hole between the high-pressure maintaining pipe and the medium-pressure maintaining pipe; the length of the high-pressure-maintaining pipe is greater than that of the medium-pressure-maintaining pipe and that of the bottom-pressure-maintaining pipe, the length of the medium-pressure-maintaining pipe is greater than that of the low-pressure-maintaining pipe, one end of the high-pressure-maintaining pipe, the medium-pressure-maintaining pipe and the low-pressure-maintaining pipe is connected with the outer wall of the oxidizing air branch pipe, and the air outlet is arranged in the pipe, and the other ends of the high-pressure-maintaining pipe, the medium-pressure-maintaining pipe and the low-pressure-maintaining pipe are opened to form an air outlet.
Furthermore, the air outlets are round holes, two air outlets are arranged on the pipe wall of the lower part of the pipe body of the oxidation air branch pipe, and the two air outlets are symmetrical by the Y axis of the circular section of the pipe body.
Furthermore, the included angle of the two air outlet holes relative to the X axis of the side of the circular section of the pipe body is 45 degrees respectively.
Furthermore, the length of the pipeline where the low-pressure maintaining pipe is located is larger than that of the pipeline where the medium-pressure maintaining pipe is located, and is also larger than that of the pipeline where the high-pressure maintaining pipe is located.
Furthermore, reinforcing rib plates are arranged between the high-pressure-maintaining pipe, the medium-pressure-maintaining pipe, the low-pressure-maintaining pipe and the outer wall of the oxidizing air branch pipe.
Furthermore, the liquid seal pipe and the oxidizing air branch pipe are equal in diameter, and the distance from the horizontal plane of the outlet of the liquid seal pipe to the center line of the oxidizing air branch pipe is larger than or equal to 500mm.
Furthermore, the pipe diameter of the liquid seal pipe is larger than the pipe diameters of the high-pressure-maintaining pipe, the medium-pressure-maintaining pipe and the low-pressure-maintaining pipe, the length of the liquid seal pipe is longer than that of the high-pressure-maintaining pipe, the medium-pressure-maintaining pipe and the low-pressure-maintaining pipe.
Furthermore, the oxidation air branch pipe is provided with 12-14 groups of air outlet holes, 2 air outlet holes in each group are positioned on the same cross section of the oxidation air branch pipe, the two high-pressure maintaining pipes are arranged on the first group of air outlet holes close to the air inlet, the medium-pressure maintaining pipe is provided with four medium-pressure maintaining pipes, two of the medium-pressure maintaining pipes are arranged on the last group of air outlet groups close to the liquid seal pipe, the other two medium-pressure maintaining pipes are arranged on the air outlet groups adjacent to or spaced from the last group of air outlet groups, and the low-pressure maintaining pipes are arranged at intervals of the rest air outlet groups.
The utility model has the beneficial technical effects that: different pressure maintaining pipes are arranged on the air outlet holes of the oxidation air branch pipes, so that the original air pressure area is changed, the adaptability problem of the oxidation fan under high and low loads is met, the high-pressure and low-pressure protection effects are realized, and the air distribution uniformity of the oxidation air is improved; the problem of uneven oxidation of the desulfurization slurry caused by blockage of the oxidation air branch pipe is effectively avoided, further rise of the pressure of the oxidation air caused by blockage of the air pipe is effectively prevented, and the operation safety and the economy of the oxidation fan are guaranteed.
Drawings
The present invention will be further explained with reference to the accompanying drawings.
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of a structure corresponding to the prior art;
FIG. 3 is a schematic cross-sectional view of the present invention;
in the figure: 1. the air conditioner comprises an oxidation air branch pipe, 2, an air outlet, 3, a reinforcing rib plate, 4, a low-pressure-maintaining pipe, 5, a medium-pressure-maintaining pipe, 6, a high-pressure-maintaining pipe, 7, an air inlet, 8, a liquid seal pipe, 9, a medium-pressure area, 10, a low-pressure area, 11 and a high-pressure area.
Detailed Description
Example 1
As shown in fig. 1, a safety device for an oxidizing air system in a wet desulphurization process, wherein each oxidizing air main pipe of the oxidizing air system is connected with a plurality of oxidizing air branch pipes 1, the connecting end of each oxidizing air branch pipe 1 and the oxidizing air main pipe is an air inlet 7, the other end of each oxidizing air branch pipe 1 is provided with a liquid seal pipe 8, a plurality of oxidizing air outlet holes 2 are arranged on the pipeline of each oxidizing air branch pipe 1, and a pressure maintaining component is arranged on a part of the oxidizing air outlet holes 2, so that a high pressure area, a low pressure area and a medium pressure area are sequentially formed on the pipeline of the oxidizing air branch pipe 1 from the air inlet 7 to the liquid seal pipe 8; under the condition of low load and low air supply quantity of the unit, the high-pressure area 11, the medium-pressure area 9 and the low-pressure area 10 are all kept in pressure, and oxidizing air enters the desulfurization slurry from an air outlet 2 without a pressure keeping assembly, so that the air outlet pressure of the air outlet is kept; or the high-pressure area 11 and the medium-pressure area 9 are subjected to pressure maintaining, and oxidizing air enters the desulfurization slurry from an air outlet without a pressure maintaining component and a low-pressure area pressure maintaining component, so that the air outlet pressure of the air outlet and the low-pressure area pressure maintaining component is maintained; when the air pressure continuously rises, the oxidizing air can sequentially enter the desulfurization slurry through the middle pressure area 9 and the high pressure area 11 according to the pressure, so that low-pressure security is realized; when the air outlet on any oxidizing air branch pipe is blocked to cause the air pressure at the outlet of the oxidizing fan to be lifted, oxidizing air enters slurry from the air outlets of the low-pressure area 10, the medium-pressure area 9 and the high-pressure area 11 or the air outlet of the liquid seal pipe 8, so that high-pressure security is realized.
<xnotran> 7 8 , 2 6, 8 2 5, 2 4, 6 5 4 , 5 4 , 6, 5 4 1 , 2 , 6, 5 4 . </xnotran>
As a comparison of fig. 1 and 2, the length of the low pressure zone line is preferably greater than the length of the medium pressure zone line and the length of the high pressure zone line.
And reinforcing rib plates 3 are also arranged between the high-pressure-maintaining pipe 6, the medium-pressure-maintaining pipe 5, the low-pressure-maintaining pipe 4 and the outer wall of the oxidizing air branch pipe 1.
The liquid seal pipe 8 and the oxidizing air branch pipe 1 are equal in diameter, and the distance from the horizontal plane of the outlet of the liquid seal pipe 8 to the center line of the oxidizing air branch pipe is larger than or equal to 500mm.
The pipe diameter of the liquid seal pipe 8 is larger than the pipe diameters of the high-pressure-maintaining pipe 6, the medium-pressure-maintaining pipe 5 and the low-pressure-maintaining pipe 4, the length of the liquid seal pipe 8 is longer than the lengths of the high-pressure maintaining pipe 6, the medium-pressure maintaining pipe 5 and the low-pressure maintaining pipe 4.
The oxidation air branch pipe 1 is provided with 12-14 groups of air outlet holes, 2 air outlet holes in each group are located on the same cross section of the oxidation air branch pipe, the high-pressure maintaining pipes are provided with two air outlet hole groups and are arranged on a first group of air outlet hole groups close to an air inlet, the medium-pressure maintaining pipes are provided with four air outlet hole groups, two air outlet hole groups are arranged on a last group of air outlet hole groups close to a liquid seal pipe, the other two air outlet hole groups are arranged on the air outlet hole groups adjacent to the last group of air outlet hole groups or spaced by a group, and the low-pressure maintaining pipes are arranged at intervals of the rest air outlet hole groups.
The oxidizing air of the limestone-gypsum wet desulphurization facility is provided by an oxidizing fan, and the pressure head calculation formula of the oxidizing fan is (1):
P=P 1 +P 2 （1）
in the formula: p is the pressure head of the oxidation fan, and the unit is kPa; p is 1 The outlet static pressure is the oxidation air outlet static pressure, and the unit is kPa; p 2 In kPa for the oxidation of the air line pressure loss.
P 1 =10 -6 ρgh（2）
In the formula: rho is the density of the slurry in the absorption tower in kg/m 3 (ii) a g is a gravitational acceleration constant; h is the height from the oxidized air pipe in the absorption tower to the liquid level, and the unit is m.
According to the formula, the higher the horizontal level elevation distance of the oxidation air outlet hole is, the higher the outlet static pressure P which needs to be overcome by the oxidation air blower 1 The larger the size, and the smaller the size. Therefore, the oxidizing air under different air supply pressures can be controlled by setting different heights of the air outlet holes of the oxidizing airThe number of the outlets can adapt to the stable air pressure maintained in the oxidation air duct under various working conditions.
Specifically, when the oxidizing wind pressure cannot overcome the heights of the high-pressure-maintaining pipe 6, the medium-pressure-maintaining pipe 5 and the low-pressure-maintaining pipe 4 under the low load and low oxidizing wind quantity, the oxidation air blown in by the oxidation fan preferentially enters the slurry from the oxidation air outlet hole, and the high-pressure-maintaining pipe 6, the medium-pressure-maintaining pipe 5, the low-pressure-maintaining pipe 4 and the liquid seal pipe 8 play a role of low-pressure security at the moment; when the wind pressure is increased to overcome the wind pressure of the low-pressure-maintaining pipe 4, oxidizing wind preferentially enters the slurry at the wind outlet hole of the oxidizing wind and the wind outlet of the low-pressure-maintaining pipe 4, and the high-pressure-maintaining pipe 6, the medium-pressure-maintaining pipe 5 and the liquid seal pipe 8 play a role of low-pressure security; when the wind pressure is increased to overcome the wind pressure of the medium-pressure-maintaining pipe 5 and the low-pressure-maintaining pipe 4, the same as the above; when the wind pressure is increased to overcome the wind pressure of the high pressure and medium pressure maintaining pipe 6, the medium pressure and low pressure maintaining pipe 5 and the low pressure and maintaining pipe 4, the oxidizing air enters the slurry from the air outlets of the air outlet 2, the high-pressure-maintaining pipe 6, the medium-pressure-maintaining pipe 5 and the low-pressure-maintaining pipe 4, and the oxidizing air branch pipe liquid seal pipe 8 plays a role of low-pressure security. In addition, when the air outlet of any pressure maintaining pipe or the air outlet 2 is blocked to cause the air pressure at the outlet of the oxidation fan to be raised, the oxidation air can also enter slurry from the air outlets of the other pressure maintaining pipes or the air outlets of the liquid seal pipes, and the high-pressure safety function is also realized.
As shown in fig. 2, under the working conditions of low wind pressure and low wind volume, the branch oxidizing wind pipe in the prior art is difficult to maintain pressure, oxidizing air preferentially enters slurry from the wind outlet 2 near the wind inlet 7, and the slurry flows backward due to the fact that the oxidizing air pressure at the far-end wind outlet becomes lower, so that the air pressure at each position in the branch oxidizing wind pipe 1 is sequentially divided into a high-pressure area, a medium-pressure area and a low-pressure area from the wind inlet 7 to the liquid seal pipe 8 along the flowing direction of the oxidizing air. It can not be found from the comparison of fig. 1 and fig. 2 that, after the security assembly is installed between the air inlet 7 of the oxidation air branch pipe and the liquid seal pipe 8, the distribution of air pressure at various positions in the oxidation air branch pipe becomes a high pressure region, a low pressure region and a medium pressure region, and the high pressure region at the air inlet 7 of the oxidation air branch pipe is the highest air inlet pressure, so that the slurry backflow phenomenon is most difficult to occur at the position, and therefore, the security assembly at the position adopts the longest pressure seal pipe; the medium-pressure area adopts a pressure maintaining pipe with medium length, and the low-pressure maintaining pipe is arranged in the middle of the oxidation wind branch pipe, so that the distribution uniformity of the oxidation wind is improved; when the wind pressure rises, the oxidizing wind enters the desulfurization slurry through the middle pressure area and the high pressure area, and the low-pressure safety function is achieved.
Example 2
A certain 630MW unit desulfurization system is equipped with two tower systems, and pipe network formula oxidation air system has all been adopted to desulfurization one-level, second grade tower, and one-level tower oxidation fan is magnetic suspension frequency conversion centrifugal fan, adjusts the oxidation wind air feed volume under the different operating modes through the frequency conversion, under unit low-load, low oxidation wind air feed volume, frequently takes place the problem that oxidation wind branch pipe blockked up, consequently, adopts this application scheme to reform transform the oxidation tuber pipe.
As shown in figures 1 and 3, 1 air outlet 2 with the diameter of phi 10mm is respectively arranged at the included angle of 45 degrees between the two sides of the three and four quadrants below an oxidizing air branch pipe 1 and the horizontal central line of the branch pipe, a group of air outlet groups are formed by bilateral symmetry with the vertical central line of the oxidizing air branch pipe 1, 12-14 air outlet groups are arranged on a single oxidizing air branch pipe 1, a stainless steel short pipe with the outer diameter of phi 57mm is selected as a pressure maintaining pipe, the pressure maintaining pipe is connected with the air outlet in a welding mode, the outer wall of the pressure maintaining pipe is fixedly welded with the oxidizing air branch pipe 1 through a vertical trapezoidal reinforcing rib 3, the length of the low-pressure maintaining pipe is 100mm, the length of the medium-pressure maintaining pipe is 200mm, the length of the high-pressure maintaining pipe is 300mm, the length of the liquid sealing pipe is 500mm, 2 high-pressure maintaining pipes are arranged on the first group of air outlet groups close to an air inlet, 2 medium-pressure maintaining pipes are arranged on the last group of air outlet groups close to the liquid sealing pipe, and 10-8 medium-pressure maintaining pipes are arranged between the low-pressure maintaining pipes and the group of air outlet groups.
Above-mentioned embodiment is only as right the utility model discloses technical scheme's explanation can not be as right the utility model discloses technical scheme's restriction, all are in the utility model discloses simple improvement on the basis all belongs to the utility model discloses a protection scope.
Claims (9)
1. The utility model provides a safety device that is arranged in wet flue gas desulfurization technology oxidation wind system, connects a plurality of oxidation wind branch pipes on every oxidation wind main pipe of oxidation wind system, and the link that every oxidation wind branch pipe and oxidation wind main pipe are the air intake, its characterized in that: the other end of each oxidizing air branch pipe is provided with a liquid seal pipe, a plurality of oxidizing air outlet holes are formed in the pipeline of each oxidizing air branch pipe, and a pressure maintaining component is arranged on the partial oxidizing air outlet holes.
2. The safety device for an oxidizing air system in a wet desulfurization process according to claim 1, wherein: the pressure maintaining assembly comprises a high-pressure maintaining pipe, a medium-pressure maintaining pipe and a low-pressure maintaining pipe, and the high-pressure maintaining pipe is arranged on a pipeline between the air inlet and the liquid seal pipe and on an air outlet close to the air inlet side; the medium-pressure-maintaining pipe is arranged on a part of the air outlet hole close to the side of the liquid seal pipe; the low-pressure maintaining pipe is arranged on a part of the air outlet hole between the high-pressure maintaining pipe and the medium-pressure maintaining pipe; the length of the high-pressure-maintaining pipe is greater than that of the medium-pressure-maintaining pipe and that of the bottom-pressure-maintaining pipe, the length of the medium-pressure-maintaining pipe is greater than that of the low-pressure-maintaining pipe, one end of the high-pressure-maintaining pipe, one end of the medium-pressure-maintaining pipe and one end of the low-pressure-maintaining pipe are connected with the outer wall of the oxidizing air branch pipe, and the air outlet is arranged in the pipe, and the other ends of the high-pressure-maintaining pipe, the medium-pressure-maintaining pipe and the low-pressure-maintaining pipe are opened to form an air outlet.
3. The safety device for an oxidizing air system in a wet desulfurization process according to claim 2, wherein: the exhaust holes are round holes, two exhaust holes are arranged on the pipe wall of the lower part of the pipe body of the oxidation air branch pipe, and the two exhaust holes are symmetrical by the Y axis of the circular section of the pipe body.
4. The safety device for an oxidizing air system in a wet desulfurization process according to claim 3, wherein: the included angle of the two air outlet holes relative to the X axis of the side of the circular section of the pipe body is 45 degrees.
5. The safety device for an oxidizing air system in a wet desulfurization process according to claim 2, wherein: the length of the pipeline where the low-pressure maintaining pipe is located is larger than that of the pipeline where the medium-pressure maintaining pipe is located, and the length of the pipeline where the high-pressure maintaining pipe is located is also larger than that of the pipeline where the high-pressure maintaining pipe is located.
6. The safety device for an oxidizing air system in a wet desulfurization process according to claim 2, wherein: and reinforcing rib plates are arranged between the high-pressure-maintaining pipe, the medium-pressure-maintaining pipe, the low-pressure-maintaining pipe and the outer wall of the oxidizing air branch pipe.
7. The safety device for an oxidizing air system in a wet desulfurization process according to claim 1, wherein: the liquid seal pipe and the oxidizing air branch pipe are in the same diameter, and the distance from the outlet level of the liquid seal pipe to the center line of the oxidizing air branch pipe is larger than or equal to 500mm.
8. The safety device for an oxidizing air system in a wet desulfurization process according to claim 7, wherein: the pipe diameter of the liquid seal pipe is larger than the pipe diameters of the high-pressure-maintaining pipe, the medium-pressure-maintaining pipe and the low-pressure-maintaining pipe, the length of the liquid seal pipe is longer than that of the high-pressure-maintaining pipe, the medium-pressure-maintaining pipe and the low-pressure-maintaining pipe.
9. The safety device for an oxidizing air system in a wet desulfurization process according to claim 8, wherein: set up 12 ~ 14 groups of air outlet group on the oxidation wind branch pipe, 2 exhaust vents of every group are located the same cross section of oxidation wind branch pipe, high pressure maintaining pipe sets up two, installs on the first group air outlet group that is close to the air intake, medium pressure maintaining pipe sets up four, and wherein two are installed on the last group air outlet group that is close to the liquid seal pipe, and two other install on the air outlet group adjacent with last group air outlet group or a set of air outlet group in interval, low pressure maintaining pipe sets up with remaining air outlet group interval.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222143087.0U CN218107276U (en) | 2022-08-16 | 2022-08-16 | Safety device for oxidizing air system in wet desulphurization process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202222143087.0U CN218107276U (en) | 2022-08-16 | 2022-08-16 | Safety device for oxidizing air system in wet desulphurization process |
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| CN218107276U true CN218107276U (en) | 2022-12-23 |
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| CN202222143087.0U Active CN218107276U (en) | 2022-08-16 | 2022-08-16 | Safety device for oxidizing air system in wet desulphurization process |
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