CN111298632B - Absorption tower for wet desulphurization and static pressure testing device thereof - Google Patents
Absorption tower for wet desulphurization and static pressure testing device thereof Download PDFInfo
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- CN111298632B CN111298632B CN202010138774.6A CN202010138774A CN111298632B CN 111298632 B CN111298632 B CN 111298632B CN 202010138774 A CN202010138774 A CN 202010138774A CN 111298632 B CN111298632 B CN 111298632B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/80—Semi-solid phase processes, i.e. by using slurries
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
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Abstract
The invention relates to an absorption tower for wet desulphurization and a static pressure testing device thereof, wherein the static pressure testing device comprises a water blocking pipe, a cover plate, a connecting pipe and a pressure gauge; the water blocking pipe comprises an air inlet end and an air outlet end, the air inlet end can penetrate through the side wall of the absorption tower and be located in the absorption tower, the cover plate covers the air outlet end and is provided with an air outlet communicated with the water blocking pipe, the connecting pipe is communicated between the air outlet and the pressure gauge, and a preset distance is reserved between the hole wall of the air outlet and the side wall of the air outlet end along a preset direction. The static pressure testing device can accurately measure the static pressure value of each section in the absorption tower so as to obtain the internal resistance characteristic of the absorption tower.
Description
Technical Field
The invention relates to the technical field of wet desulphurization equipment of coal-fired power plants, in particular to an absorption tower for wet desulphurization and a static pressure testing device thereof.
Background
Sulfides (SO) produced by combustion in coal-fired power plantsx) The method is mainly used for protecting atmospheric pollution, and the control and treatment of sulfide emission are important tasks for protecting atmospheric pollution. Limestone (lime) -gypsum wet desulphurization is the desulphurization process technology which has the widest application range and the most mature process technology in the world at present and is the current international popular basic process for flue gas desulphurization of large-unit thermal power plants. It uses cheap limestone or lime as desulfurizing absorbent, and the finely ground limestone and water are made into spraying slurry. In the absorption tower, the spraying slurry is contacted and mixed with the flue gas, the sulfur dioxide in the flue gas, the calcium carbonate in the slurry and the blown oxidizing air are subjected to chemical reaction to be removed, and the final reaction product is gypsum.
The wet desulphurization technology has the advantages of stable operation, large flue gas treatment capacity, high desulphurization efficiency and the like, but also has the defects of high energy consumption and high operation cost. The resistance is an important index of the operation of a wet desulphurization system, and determines the operation energy consumption, and the resistance characteristics of each flow area of the absorption tower can be influenced by the flow rate of flue gas, the spraying amount, the liquid-gas ratio and the like. The absorption tower is the most important component of the wet desulphurization system, and the resistance of the whole wet desulphurization system is mainly concentrated on the absorption tower, which directly influences the economical efficiency of the system operation. The resistance characteristics of each flow area of the absorption tower are obtained, and a certain theoretical basis can be laid for the design and operation of wet desulphurization.
At present, a physical model with a reduced scale can be built to study the resistance characteristic in the absorption tower. According to the Bernoulli equation, the pressure drop of the two sections can be obtained by measuring the total pressure or static pressure and flow velocity of the flue gas of each section, so that the resistance characteristic of each flow area of the absorption tower can be obtained. However, the prior art can only test the total pressure or static pressure and flow velocity of the flue gas between dry-state cross sections in the absorption tower, such as an inlet of the absorption tower, an outlet of a demister and an outlet of the absorption tower, so as to obtain the flow pressure drop of the two dry-state cross sections. If the existing instrument is adopted to test the pressure drop between the sections of the absorption inner wet state containing a large amount of liquid drops, such as a tray, a spraying layer and a demister, the problem that water enters a test port exists in a test device during testing, the accuracy of the test is influenced, and the test instrument is possibly damaged.
Therefore, how to accurately measure the pressure drop of each section in the absorption tower so as to obtain the resistance characteristic in the absorption tower is a technical problem to be solved by the technical personnel in the field.
Disclosure of Invention
The invention aims to provide an absorption tower for wet desulphurization and a static pressure testing device thereof, which can accurately measure the static pressure value of each section in the absorption tower so as to obtain the internal resistance characteristic of the absorption tower.
In order to solve the technical problem, the invention provides a static pressure testing device of an absorption tower for wet desulphurization, which comprises a water blocking pipe, a cover plate, a connecting pipe and a pressure gauge; the water blocking pipe comprises an air inlet end and an air outlet end, the air inlet end can penetrate through the side wall of the absorption tower and be located in the absorption tower, the cover plate covers the air outlet end and is provided with an air outlet communicated with the water blocking pipe, the connecting pipe is communicated with the air outlet and the pressure gauge, a preset distance is reserved between the hole wall of the air outlet and the side wall of the air outlet end along a preset direction.
In the installation state, the preset direction is the downward direction along the axial direction of the absorption tower, that is, in the use state, a preset distance is left between the bottom wall of the air outlet and the bottom wall of the water retaining pipe, that is, the bottom wall height of the air outlet is higher than that of the water retaining pipe.
In the absorption tower, the spraying device sprays the slurry from top to bottom, as shown in the figure, the air flow direction in the absorption tower blows from bottom to top, so that the gas mixed with slurry liquid drops enters the water retaining pipe along the air inlet end, the air flow blows part of the liquid drops upwards to the outer side of the bottom wall of the water retaining pipe, the part of the liquid drops cannot enter the water retaining pipe, the liquid drops entering the water retaining pipe are mainly accumulated at the bottom of the water retaining pipe from top to bottom due to the shielding of the pipe wall above the slurry liquid drops, and the liquid drops are gradually reduced from inside to outside along the axial direction of the water retaining pipe, namely, in the water retaining pipe, the liquid drops are mostly accumulated at the bottom of the water retaining pipe and the gas is mostly distributed at the upper side in the water retaining pipe, because the bottom wall height of the air outlet is higher than that of the water retaining pipe, therefore, the slurry near the bottom wall in the water retaining pipe cannot be discharged along the air outlet due to the blocking of the cover plate, and the gas that is located the intraductal upside of manger plate can follow the gas vent and discharge and follow the connecting pipe and get into in the pressure gauge to can measure the static pressure of the cross-section of this static pressure testing arrangement place in the absorption tower through the pressure gauge.
According to Bernoulli's equation, the average flow velocity of wet sections such as trays, spray layers and demister in the absorption tower is the same, and the difference value of dynamic pressure terms of the two sections is 0, so that the pressure drop of the two sections can be obtained by measuring the static pressure difference of the two sections of the first section and the second section. Therefore, by using the static pressure testing device provided by the embodiment, the static pressures of two sections in the absorption tower are respectively tested, and the pressure drop of the two sections can be obtained by calculating the difference.
This static pressure testing arrangement simple structure, and need not to consider the condition that can appear liquid entering pressure gauge and lead to damaging the pressure gauge, can also accurately measure the static pressure of cross-section simultaneously, and then can carry out accurate test to the static pressure of each cross-section in the absorption tower, provide technical support for the interior stress characteristic research of absorption tower for wet flue gas desulfurization.
Optionally, a drain hole is formed in a side wall of the water blocking pipe facing the preset direction.
Optionally, the water blocking pipe is a tapered pipe, the air inlet end is formed at a large-diameter end of the tapered pipe, and the air outlet end is formed at a small-diameter end of the tapered pipe.
Optionally, the taper angle of the tapered tube is 15 ° to 25 °.
Optionally, the manometer is a U-manometer.
Optionally, the connection pipe includes a fixed pipe and a hose, the fixed pipe and the hose are communicated, the fixed pipe is communicated with the drain hole, and the hose is communicated with the pressure gauge.
Optionally, the water blocking pipe, the cover plate and the fixing pipe are all made of stainless steel.
Optionally, the length of the water blocking pipe is 50 mm-80 mm, and the diameter of the water blocking pipe is 30 mm-50 mm;
and/or the ratio of the distance between the drain hole and the air inlet end of the water retaining pipe to the length of the water retaining pipe is 0.6-0.8;
and/or the diameter ratio of the fixed pipe to the water retaining pipe is 0.2-0.3.
In addition, the invention also provides an absorption tower for wet desulphurization, which comprises the static pressure testing device, wherein the side wall of the absorption tower is provided with a measuring hole matched with a water retaining pipe of the static pressure testing device, and the air inlet end of the water retaining pipe can penetrate through the measuring hole and is positioned in the absorption tower.
The technical effect of the absorption tower with the static pressure testing device is similar to that of the static pressure testing device, and is not repeated herein for saving space.
Optionally, at least two static pressure test devices are uniformly arranged on the same section of the absorption tower along the circumferential direction.
Drawings
FIG. 1 is a schematic structural view of an absorption tower for wet desulfurization provided in an embodiment of the present invention;
FIG. 2 is a schematic cross-section and a schematic side view of an absorption tower;
fig. 3-4 are schematic structural views of the static pressure testing device.
In the accompanying fig. 1-4, the reference numerals are illustrated as follows:
10-static pressure test device; 20-an absorption column; 30-spraying device, 40-liquid drop;
1-a water blocking pipe and 11-a drain hole;
2-cover plate, 21-exhaust port;
3-connecting pipe, 31-fixing pipe, 32-hose;
4-pressure gauge.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
Please refer to fig. 1-4, fig. 1 is a schematic structural diagram of an absorption tower for wet desulphurization according to an embodiment of the present invention; FIG. 2 is a schematic cross-section and a schematic side view of an absorption tower; fig. 3-4 are schematic structural views of the static pressure testing device.
The embodiment of the invention provides an absorption tower 20 for wet desulphurization and a static pressure testing device 10 thereof, wherein as shown in fig. 1, the absorption tower 20 for wet desulphurization is provided with the static pressure testing device 10, specifically, as shown in fig. 3 and 4, the static pressure testing device 10 comprises a water blocking pipe 1, a cover plate 2, a connecting pipe 3 and a pressure gauge 4, the water blocking pipe 1 comprises an air inlet end and an air outlet end, the air inlet end can penetrate through the side wall of the absorption tower 20 and is positioned in the absorption tower 20, the air outlet end is positioned outside the absorption tower 20 and is sealed by the cover plate 2, the cover plate 2 is provided with an air outlet 21, and a preset distance is reserved between the hole wall of the air outlet 21 and the side wall of the air outlet end of the water blocking pipe 1 along a preset direction.
In detail, as shown in fig. 3 and 4, the predetermined direction is a downward direction along the axial direction of the absorption tower 20 in the installation state, that is, a predetermined distance is left between the bottom wall of the air outlet 21 and the bottom wall of the water blocking pipe 1 in the use state, that is, the bottom wall of the air outlet 21 is higher than the bottom wall of the water blocking pipe 1.
In the absorption tower 20, the spraying device 30 sprays the slurry from top to bottom, as shown in fig. 1, the direction of the air flow in the absorption tower 20 is blown from bottom to top, so that the gas mixed with the slurry droplets 40 enters the water blocking pipe 1 along the air inlet end, the air flow blows part of the droplets 40 upwards to the outside of the bottom wall of the water blocking pipe 1, the part of the droplets 40 cannot enter the water blocking pipe 1, the droplets 40 entering the water blocking pipe 1 are mainly accumulated at the bottom of the water blocking pipe 1 due to the shielding of the upper pipe wall from top to bottom, and the amount of the droplets 40 is gradually reduced from inside to outside along the axial direction of the water blocking pipe 1, that is, in the water blocking pipe 1, of the gas and the droplets 40 entering from the air inlet end, the droplets 40 are mostly accumulated at the bottom of the water blocking pipe 1, the gas is mostly distributed at the upper side in the water blocking pipe 1, because the height of the exhaust port 21 is higher than the bottom wall of the water blocking pipe 1, therefore, the slurry in the water blocking pipe 1 near the bottom wall cannot be discharged along the gas outlet 21 due to the blocking of the cover plate 2, and the gas at the upper side in the water blocking pipe 1 can be discharged along the gas outlet 21 and enter the pressure gauge 4 along the connecting pipe 3, so that the static pressure of the section of the absorption tower 20 at the position where the static pressure testing device 10 is located can be measured by the pressure gauge 4.
Referring to bernoulli's equation, the following equation (1):
wherein Δ P refers to the pressure drop of the first and second cross-sections, P1Is the static pressure value, P, of the first cross section2Refers to the static pressure value of the second section, p represents the airflow density, V1Representing the mean velocity, V, of the gas flow in the first section2Representing the mean velocity, Z, of the gas flow in the second section1Indicating the height of the position of the first section, Z2Indicating the height of the location of the second cross section.
It can be known that, in the absorption tower 20, the average flow velocity of wet sections such as the tray, the spray layer, and the demister is the same, and the difference between the dynamic pressure terms of the two sections is 0, the pressure drop between the two sections can be obtained by measuring the static pressure difference between the two sections of the first section and the second section. Therefore, by using the static pressure testing device 10 provided in this embodiment, the static pressures of two sections in the absorption tower 20 are respectively tested, and the pressure drop of the two sections can be obtained by calculating according to the bernoulli equation.
The static pressure testing device 10 provided by the embodiment is simple in structure, the situation that the pressure gauge 4 is damaged due to the fact that liquid enters the pressure gauge 4 is not considered, meanwhile, the static pressure of the cross section can be accurately measured, the static pressure of each cross section in the absorption tower 20 can be accurately tested, and technical support is provided for the research on the pressure characteristics in the absorption tower 20 for wet desulphurization.
Specifically, the lateral wall of absorption tower 20 is equipped with the survey hole, and this survey hole and static pressure testing arrangement 10's manger plate pipe 1 looks adaptation, when needs test the static pressure of this survey hole place cross-section, only need pass the survey hole with manger plate pipe 1 and lie in this absorption tower 20 to the pore wall of survey hole is sealed with the outer wall that keeps off the water pipe can.
In the above embodiment, the side wall of the water blocking pipe 1 facing the preset direction is provided with the drainage hole 11, as shown in fig. 3, in the use state, the drainage hole 11 is disposed on the bottom wall of the water blocking pipe 1, so that the liquid droplets 40 entering the water blocking pipe 1 along the air inlet end can be discharged along the drainage hole 11, and the liquid droplets 40 are prevented from accumulating more and being discharged along the air outlet 21, thereby ensuring the accuracy of the static pressure test and avoiding the situation that the pressure gauge 4 is damaged due to the liquid entering.
Specifically, as shown in fig. 3, in this embodiment, the drain hole 11 is provided in the portion of the water blocking pipe 1 located in the absorption tower 20 in the installed state, so that the collection and treatment of the discharged slurry are not required and the test result is not affected, thereby simplifying the overall structure.
Alternatively, in this embodiment, as shown in fig. 4, the water blocking pipe 1 may be a tapered pipe, the large diameter end of the tapered pipe forms the air inlet end, and the small diameter end of the tapered pipe forms the air outlet end, that is, after the static pressure testing apparatus 10 is installed with the water blocking pipe 1, because the bottom wall of the air inlet end in the absorption tower 20 is low in height, the liquid drops 40 entering the water blocking pipe 1 from the air inlet end will fall into the bottom wall under the action of gravity and flow along the bottom wall to the air inlet end to the outside of the water blocking pipe 1 and enter the absorption tower 20, so that the excessive slurry in the water blocking pipe 1 can be prevented from being discharged from the air outlet 21.
Furthermore, the cone angle alpha of the conical pipe is 15-25 degrees, so that the problem that liquid drops 40 easily enter the water baffle pipe 1 due to the excessively large cone angle can be avoided, and the condition that internal slurry cannot be discharged due to the excessively small cone angle can also be avoided.
That is to say, in this embodiment, can set up the manger plate 1 into pipe or toper pipe, when the manger plate 1 is the pipe, it is equipped with wash port 11, under the installation, this wash port 11 sets up downwards, and when the manger plate 1 is the toper pipe, the great one end of diameter is the inlet end, the less one end of diameter is for giving vent to anger the end and seal through apron 2, the gathering of liquid drop 40 in manger plate 1 is too much all can be avoided in two kinds of settings, thereby can avoid liquid to get into in pressure gauge 4 along connecting pipe 3, guarantee the accuracy of test result.
In the above embodiment, the pressure gauge 4 is provided as the U-shaped pressure gauge 4, and the U-shaped pressure gauge 4 measures the positive pressure, the differential pressure, and the negative pressure by balancing the measured pressure with the static pressure generated by the liquid column of a certain height according to the principle of the hydrostatic force. The U-shaped pressure gauge 4 has the advantages of simple structure, firmness, durability, low price, long service life, convenient reading, reliable data, no need of external power and no need of consuming any energy. Moreover, the U-shaped pressure gauge 4 can prevent the damage of the instrument caused by the careless entering of the slurry into the testing instrument, and is not influenced by the temperature of the gas in the absorption tower 20. The static pressure value is read by subtracting the atmospheric pressure P2 from the pressure P1 generated by the absorber column 20.
Experimental research shows that the maximum static pressure in the absorption tower 20 is not more than 2000Pa, so the range of the U-shaped pressure gauge 4 is selected according to different test sections, the selectable range is-500 +500Pa, -1000+1000 Pa-1500 +1500Pa, and the U-shaped pressure gauge can be selected and used according to the situation. During testing, the U-shaped pipe pressure gauge 4 is vertically placed, the liquid level heights of the two pipes are read simultaneously, the sight line is flush with the liquid level, and the reading is based on the tangent line at the top of the meniscus of the liquid level. During testing, the numerical value is read repeatedly and carefully, so that errors are reduced as much as possible, and the measurement precision is improved.
In the above embodiment, the connection pipe 3 includes the fixing pipe and the hose 32 which are communicated with each other, wherein the fixing pipe is communicated with the drainage hole 11, which can play a role of guiding flow to stabilize the air flow, and simplify the connection operation between the drainage hole 11 and the hose 32, and the hose 32 is communicated with the pressure gauge 4, which can make the arrangement of the external pressure gauge 4 more flexible.
Specifically, the hose 32 may include at least two hose segments that communicate with each other, so that the number of the hose segments can be flexibly selected as required to adjust the length of the hose, and certainly, the greater the number of the hose segments included in the hose 32, the poorer the sealing performance will be, and therefore, the hose 32 preferably includes no more than three hose segments, so that the testing accuracy can be ensured, and the flexibility in use can be ensured.
In the above embodiment, the water blocking pipe 1, the cover plate 2 and the fixing pipe 31 are made of stainless steel, and the slurry droplets 40 in the absorption tower 20 contain corrosive substances, so that the stainless steel has good structural strength and strong corrosion resistance, the service life of the stainless steel is ensured, and both 304 and 316L stainless steel can be specifically selected.
In the above-described embodiment, the size of the water blocking pipe 1, the fixing pipe 31, and the like is not particularly limited, and the following ranges are preferably given: the length L of the water blocking pipe 1 is 50 mm-80 mm, the diameter D of the water blocking pipe 1 is 30 mm-50 mm, and when the water blocking pipe 1 with the length L of 50 mm-80 mm and the width D of 30 mm-50 mm is selected according to the specification of the absorption tower 20 for wet desulphurization in the prior art, the static pressure detection effect is more accurate; the ratio L1/L of the distance L1 between the drain hole 11 and the air inlet end of the water retaining pipe 1 to the total length L of the water retaining pipe 1 is set to be 0.6-0.8, namely the drain hole 11 is arranged on one side of the water retaining pipe 1 facing the air outlet end, so that all liquid drops 40 entering the water retaining pipe 1 can be discharged from the drain hole 11; the ratio D/D of the diameter D of the fixed pipe 31 to the diameter D of the water retaining pipe 1 is set to be 0.2-0.3, and multiple experimental tests show that the setting can ensure that the test result is more accurate.
When the water blocking pipe 1 is provided with the drain hole 11, as shown in fig. 3, the ratio of the distance between the axis of the air outlet 21 and the axis of the water blocking pipe 1 to the diameter D of the water blocking pipe 1 is 0.2 to 0.3, and when the water blocking pipe 1 is a tapered pipe, the ratio of the distance between the axis of the air outlet 21 and the axis of the water blocking pipe 1 to the diameter D of the water blocking pipe 1 can be 0.2 to 0.3, or as shown in fig. 4, the axis of the air outlet 21 and the axis of the water blocking pipe 1 are collinear, as long as a preset distance is reserved between the hole wall of the air outlet 21 and the side wall of the air outlet end of the water blocking pipe 1, so as to ensure that the liquid drops 40 in the water blocking pipe 1 cannot flow out along the air outlet 21 in the installation state. Specifically, the preset distance is not limited, and the preset distance can be set according to the length L, the diameter D and the like of the water retaining pipe 1.
In the above embodiment, at least two static pressure testing devices 10 are uniformly arranged on the same cross section of the absorption tower 20 at intervals along the circumferential direction, that is, at least two measuring holes are arranged on the side wall of the absorption tower 20, so as to detect the static pressure at the cross section from different positions of the same cross section, and finally, the detection data are averaged and used for calculating the pressure difference, so that the accuracy and reliability of the detection result can be further improved. As shown in fig. 2, in the present embodiment, four static pressure test devices 10 are provided on the same cross section of the absorption tower 20, or two, three, five, etc. static pressure test devices 10 may be provided, which is not limited herein.
Specifically, under the test conditions that the airflow speed in the absorption tower 20 is 3.6m/s and the spraying device 30 is completely opened, the static pressure values of the front and rear sections of the tray are tested, and four measuring holes are respectively arranged on each section. The water blocking pipe 1 of the static pressure testing device 10 provided in this embodiment is extended into the absorption tower 20 from the testing hole to test the static pressure value (each section is tested for the static pressure value by four static pressure testing devices 10 at the same time), and the test results are shown in table 1 below. The static pressure value deviation measured by the static pressure testing device at each measuring point in the same section is small, and the pressure drop before and after the tray is calculated to be 730Pa, which accords with the theory and the operation empirical value.
TABLE 1 static pressure test data for front and rear section of tray
The foregoing is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.
Claims (10)
1. A static pressure test device of an absorption tower for wet desulphurization is characterized by comprising a water blocking pipe (1), a cover plate (2), a connecting pipe (3) and a pressure gauge (4);
the water blocking pipe (1) comprises an air inlet end and an air outlet end, the air inlet end can penetrate through the side wall of the absorption tower (20) and is positioned in the absorption tower (20), the cover plate (2) covers the air outlet end and is provided with an air outlet (21) communicated with the water blocking pipe (1), the connecting pipe (3) is communicated between the air outlet (21) and the pressure gauge (4), and a preset distance is reserved between the hole wall of the air outlet (21) and the side wall of the air outlet end along a preset direction;
the axis of the water blocking pipe (1) is arranged along the horizontal direction;
the slurry which is positioned in the water blocking pipe (1) and close to the bottom wall cannot be discharged along the exhaust port (21) due to the blocking of the cover plate (2), and the gas positioned at the upper side in the water blocking pipe (1) can be discharged along the exhaust port (21) and enters the pressure gauge (4) along the connecting pipe (3).
2. The static pressure testing device according to claim 1, characterized in that the side wall of the water blocking pipe (1) facing the preset direction is provided with a drainage hole (11).
3. The static pressure testing device according to claim 1, characterized in that the water blocking pipe (1) is a conical pipe, the large diameter end of which forms the air inlet end and the small diameter end of which forms the air outlet end.
4. The static pressure testing apparatus of claim 3, wherein the cone angle of the conical tube is 15 ° -25 °.
5. Static pressure testing device according to any of claims 1-4, characterized in that the pressure gauge (4) is a U-gauge (4).
6. The static pressure testing device according to claim 2, characterized in that the connecting pipe (3) comprises a fixed pipe and a flexible pipe (32) which are arranged in a communicating manner, the fixed pipe is communicated with the drain hole (11), and the flexible pipe (32) is communicated with the pressure gauge (4).
7. The static pressure testing device according to claim 6, characterized in that the water blocking pipe (1), the cover plate (2) and the fixing pipe (31) are all made of stainless steel.
8. The static pressure testing device according to claim 6, characterized in that the length of the water blocking pipe (1) is 50 mm-80 mm, and the diameter of the water blocking pipe (1) is 30 mm-50 mm;
and/or the ratio of the distance between the drain hole (11) and the air inlet end of the water retaining pipe (1) to the length of the water retaining pipe (1) is 0.6-0.8;
and/or the diameter ratio of the diameter of the fixed pipe (31) to the diameter of the water retaining pipe (1) is 0.2-0.3.
9. An absorption tower for wet desulphurization, comprising the static pressure testing device (10) according to any one of claims 1-8, wherein the side wall of the absorption tower (20) is provided with a measuring hole matched with a water retaining pipe (1) of the static pressure testing device (10), and the air inlet end of the water retaining pipe (1) can pass through the measuring hole and is positioned in the absorption tower (20).
10. The absorption tower for wet desulfurization according to claim 9, wherein at least two of the static pressure test devices (10) are uniformly arranged in the circumferential direction on the same cross section of the absorption tower (20).
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