CN213049956U - A exhaust gas purification equipment for job site - Google Patents

Abstract

The utility model discloses a waste gas purification equipment for job site, this equipment includes: the Venturi tube comprises an air inlet pipe, a contraction pipe, a throat pipe, a diffusion pipe and a contraction bent pipe which are sequentially connected, and the pipe wall of the contraction pipe is provided with a water injection port; cyclone, cyclone include the drum, are equipped with into trachea, blast pipe and waste discharge port on the drum, wherein go into the trachea and be located the one end of drum and set up along the tangential direction of drum, and the blast pipe setting is at the other end of drum, and the narrow end of shrink return bend links to each other with going into the trachea. The utility model discloses a harmful gas and particulate matter among the exhaust gas of diesel generator are dissolved with the atomized water to exhaust gas purification equipment, make the water droplet that carries the pollutant with the mode of whirlwind separation again and subside, and the gas after the purification directly discharges in the environment of job site to most pollutant in the diesel generator waste gas has been got rid of effectively.

Description

A exhaust gas purification equipment for job site

Technical Field

The utility model relates to a waste gas treatment equipment field, in particular to a waste gas purification equipment for job site.

Background

For a long time, diesel-driven installations on construction sites have been usedA negligible source of comprehensive pollution. Black smoke and suffocating gases emitted from diesel engines threaten the health of construction workers and nearby residents. The main pollutants of diesel exhaust include unburned Hydrocarbons (HCs), particulate matter (DPM), Nitrogen Oxides (NO) _x ) Sulfur dioxide (SO)₂) Carbon monoxide (CO) and carbon dioxide (CO)₂). Most pollutants are easy to cause respiratory diseases, and some pollutants even belong to carcinogenic substances. In addition, diesel engines are one of the sources of noise pollution and thermal pollution on site at construction sites.

SUMMERY OF THE UTILITY MODEL

For solving above-mentioned prior art's one or more problems, the utility model provides a waste gas purification equipment for job site.

An exhaust gas purifying apparatus for a construction site, comprising:

the Venturi tube comprises an air inlet pipe, a contraction pipe, a throat pipe, a diffusion pipe and a contraction bent pipe which are sequentially connected, and the pipe wall of the contraction pipe is provided with a water injection port;

cyclone, cyclone include the drum, are equipped with into trachea, blast pipe and waste discharge port on the drum, wherein go into the trachea and be located the one end of drum and set up along the tangential direction of drum, and the blast pipe setting is at the other end of drum, and the narrow end of shrink return bend links to each other with going into the trachea.

The beneficial effects of the embodiment are as follows: the atomized water is used for dissolving harmful gas in the exhaust gas discharged by the diesel generator and capturing particulate matters, then water drops carrying pollutants are settled in a cyclone separation mode, and the purified gas is directly discharged to the environment of a construction site, so that most pollutants in the exhaust gas of the diesel generator are effectively removed.

In certain embodiments, the inlet tube, the convergent tube, the throat tube, the divergent tube, and the convergent elbow are square in cross-section.

In some embodiments, the inlet tube is connected to the wide end of the convergent tube, the throat tube has one end connected to the narrow end of the convergent tube and the other end connected to the narrow end of the divergent tube, and the wide end of the divergent tube is connected to the wide end of the convergent elbow. The convergent tube, the throat, the divergent tube and the convergent elbow define a lumen of the venturi that varies in a convergent, invariant, divergent and convergent manner. The waste gas of the diesel generator is accelerated to ensure that the waste gas obtains enough kinetic energy to break and atomize the injected water; in the diffusion tube, the gas-liquid mixture decelerates, so that the growth of liquid drops is facilitated to obtain certain mass, and the subsequent cyclone separation is facilitated; in the pinch bend, the gas-liquid mixture is accelerated, facilitating the formation of a cyclone.

In certain embodiments, the venturi and cyclone are arranged side-by-side and horizontally. The exhaust gas purification device of the embodiment can be horizontally installed at the top of the diesel generator, and does not occupy too much space.

In some embodiments, the waste outlet and the gas inlet pipe are located at the same end of the cylinder, the cyclone separator forms an angle of 3-5 ° with the horizontal plane, and the end of the gas outlet pipe is higher than the end of the waste outlet pipe. This facilitates the flow of droplets settling at the bottom of the cylinder to the waste outlet.

In some embodiments, a vortex guide is arranged in the cylinder and is coaxial with the cylinder, the vortex guide is cylindrical, and a gap between the vortex guide and the inner wall of the cylinder is opposite to the air inlet pipe. The gas-liquid mixture enters the gap between the vortex guide and the inner wall of the cylinder along the tangential direction from the gas inlet pipe and moves along the annular gap to form a cyclone.

In some embodiments, the exhaust pipe is an elbow with the exhaust port of the exhaust pipe facing upward.

In some embodiments, one end of the throat tube is detachably connected with the narrow end of the contraction tube, the other end of the throat tube is detachably connected with the narrow end of the diffusion tube, and an orifice plate with a rectangular hole is detachably connected between the narrow end of the contraction elbow tube and the air inlet tube. Through the concept of parts interchange, the model type of exhaust gas purification equipment has been reduced. The exhaust gas purification device of the embodiment has universality, and diesel generators with various capacities can use the exhaust gas purification device of the same model, and only the specifications of the throat pipe and the pore plate are different, so that the manufacturing cost is reduced.

In certain embodiments, the cross-sectional dimension of the straight tube portion of the throat and the rectangular aperture dimension of the aperture plate are one of the following combinations: (a) the cross section of the straight pipe part of the throat pipe is 80 multiplied by 80mm, and the rectangular hole of the orifice plate is 70 multiplied by 75 mm; (b) the cross section of the straight pipe part of the throat pipe is 100 multiplied by 100mm, and the rectangular hole of the orifice plate is 90 multiplied by 75 mm; (c) the cross section of the straight pipe part of the throat pipe is 130 multiplied by 130mm, and the rectangular hole of the orifice plate is 150 multiplied by 75 mm; (d) the cross section of the straight pipe part of the throat pipe is 130 multiplied by 130mm, and the rectangular hole of the orifice plate is 120 multiplied by 90 mm; (e) the cross section of the straight pipe part of the throat pipe is 160 multiplied by 160mm, and the rectangular hole of the orifice plate is 175 multiplied by 90 mm; (f) the cross section of the straight pipe part of the throat pipe is 200 multiplied by 200mm, and the rectangular hole of the orifice plate is 250 multiplied by 125 mm. The 6 groups are suitable for common diesel generators with the capacities of 50kVA, 60kVA, 75kVA, 100kVA, 200kVA, 270kVA, 350kVA, 450kVA and the like.

In some embodiments, the length of the lumen of the cylinderL _m Inner diameter of cylinderD _b Inner diameter of exhaust pipeD _e The following relationship is satisfied: 6D _e ≤L _m ≤10D _e ，2D _e ≤D _b ≤2.5D _e . The exhaust gas purifying apparatus of the present embodiment reduces the exhaust noise of the diesel generator to some extent.

Drawings

Fig. 1 schematically shows a perspective view of an exhaust gas purifying apparatus for a construction site.

Fig. 2 schematically shows a top view of an exhaust gas purification apparatus for a construction site.

Fig. 3 schematically shows a side view of an exhaust gas purification apparatus for a construction site.

Figure 4 shows schematically a perspective view of a cyclone separator.

Fig. 5 schematically shows a comparison of exhaust temperatures of diesel generators with and without the exhaust gas purifying apparatus of the present invention.

Fig. 6 schematically shows a partial schematic view at the throat of an exhaust gas purification apparatus.

Figure 7 schematically illustrates a partially expanded view of the junction of the constricted elbow and the inlet tube.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Example 1

A first object of the present disclosure is to provide an exhaust gas purifying apparatus capable of removing most of pollutants in exhaust gas discharged from a diesel generator at a construction site. Fig. 1 schematically shows a perspective view of an exhaust gas purifying apparatus for a construction site. Fig. 2 schematically shows a top view of an exhaust gas purification apparatus for a construction site. Fig. 3 schematically shows a side view of an exhaust gas purification apparatus for a construction site. Referring to fig. 1 and 2, an exhaust gas purifying apparatus for a construction site includes a venturi tube 1 and a cyclone 2 connected to the venturi tube 1.

With continued reference to fig. 1 and 2, the venturi tube 1 includes an inlet tube 3, a convergent tube 4, a throat tube 5, a divergent tube 6, and a convergent elbow 7 connected in series. The convergent tube 4, the throat 5, the divergent tube 6 and the convergent elbow 7 are connected in series to define a continuous venturi tube 1 lumen which varies in the order of convergent, constant, divergent and convergent.

The cross-sections of the convergent tube 4, the throat 5, the divergent tube 6 and the convergent elbow 7 are substantially square. The contraction tube 4 has one end connected to the inlet tube 3 and the other end connected to the throat 5. Referring to fig. 2, the constriction tube 4 comprises at least one constriction section 9 whose lumen converges in a direction close to the throat 5. The top pipe wall of the shrink tube 4 is provided with a water injection port 8, and specifically, the water injection port 8 is arranged at a shrink section 9 of the shrink tube 4. Preferably, the water injection port 8 is provided near the narrow end of the shrink tube 4. The waste gas that flows through 4 narrow ends of shrink tube has great velocity of flow, can form bigger impact force to the water that injects into from water filling port 8 to realize better atomization effect. The water filling port 8 is used for filling water into the contraction pipe 4, the water filling port 8 can be externally connected with a water pipe 10, and a water valve 11 for controlling water inflow is arranged on the water pipe 10.

One end of the throat pipe 5 is connected with the narrow end of the contraction pipe 4, and the other end is connected with the narrow end of the diffusion pipe 6. Generally speaking, the main part of the throat pipe 5 is a straight pipe with a constant pipe cavity cross section, and the cross section size of the straight pipe part does not exceed the cross section sizes of the narrow end of the contraction pipe 4 and the narrow end of the diffusion pipe 6, so that in some embodiments, under the condition that the straight pipe cross section of the throat pipe 5 is smaller, the two ends of the throat pipe 5 are gradually enlarged to ensure that the throat pipe 5 is well jointed and transited with the contraction pipe 4 and the diffusion pipe 6.

The diffuser 6 is a square tube with one narrow end and the other wide end, which means that the cross section of the lumen of the diffuser 6 gradually changes from small to large. The contracted elbow 7 may be a 90 ° elbow, which is substantially L-shaped, and has one wide end and a narrow end, i.e., the cross section of the lumen of the contracted elbow 7 gradually changes from large to small. The wide end of the convergent elbow 7 is connected to the wide end of the diffuser 6 and the narrow end of the convergent elbow 7 is connected to the cyclone 2. The contraction elbow 7 is in a 90-degree bent shape, so that the Venturi tube 1 and the cyclone separator 2 are arranged in parallel, the structure of the waste gas purification equipment is compact, and the equipment occupies as little space as possible when being applied to a construction site.

Figure 4 shows schematically a perspective view of a cyclone separator. Referring to fig. 1-4, the cyclone separator 2 includes a cylinder 12, a vortex guide 13, a waste discharge port 14, an exhaust pipe 15 and an air inlet pipe 16, and the narrow end of the constricted elbow 7 is connected to the air inlet pipe 16. In which a swirl guide 13, a waste discharge port 14 and an air inlet pipe 16 are provided at one end of a cylinder 12, and an exhaust pipe 15 is provided at the other end of the cylinder 12. The gas inlet pipe 16 is provided in a tangential direction of the cylinder 12 for introducing the gas-liquid mixture from the venturi tube 1 into the cylinder 12 tangentially. The inlet tube 16 is a rectangular inlet tube 16, i.e., the inlet tube 16 has a rectangular cross-section. The exhaust pipe 15 is a bent pipe having an opening facing upward, and exhausts gas upward from the exhaust pipe 15. The swirl guide 13 is a closed-end cylinder, the swirl guide 13 is disposed in the cylinder 12, and a gap formed between the swirl guide 13 and the inner wall of the cylinder 12 is opposite to the gas inlet pipe 16, and the gas-liquid mixture from the venturi tube 1 enters the gap tangentially from the gas inlet pipe 16 and moves along the annular gap to form a cyclone, and the cyclone advances in the axial direction of the cylinder 12 and is discharged from the gas discharge pipe 15.

Referring to fig. 3, the venturi 1 and the cyclone 2 may be installed on a horizontal base 17 in a horizontal manner. Preferably, the cyclone separator 2 is angled at an angle of 3 to 5 to the horizontal and the end of the discharge duct 15 is slightly raised, i.e. the end of the discharge duct 15 is higher than the end of the discharge opening 14, which facilitates the flow of liquid settled at the bottom of the drum 12 towards the discharge opening 14.

When in use, the exhaust port of the diesel generator is connected with the air inlet pipe 3 of the Venturi tube 1 by a metal pipe or a hose which can resist the high temperature of more than 800 ℃. The exhaust gas from the diesel generator enters the convergent pipe 4 through the inlet pipe 3 and is accelerated by generating a venturi effect when passing through the convergent pipe 4. The water injected from the water injection port 8 is rapidly evaporated by encountering high-temperature exhaust gas, so that the shrinkable tube 4 is filled with water vapor. In this case, the further injected water will remain liquid. The throat 5 is a narrow passage and the high velocity air flow shears large amounts of water remaining from the walls of the throat 5, thereby producing large amounts of very small water droplets, resulting in atomization of the water. In the throat 5 and the diffuser 6, fine water droplets trap particulate matter in the exhaust gas and dissolve soluble harmful gases. The flow velocity of the gas flow carrying the tiny water drops is slowed down after entering the diffuser 6, which is beneficial to the collision among the water drops and the growth of the water drops, so that the water drops containing the pollutants obtain larger mass before entering the cyclone separator 2, and the pressure of the gas-liquid mixture is also recovered after the gas-liquid mixture is decelerated. Then the gas-liquid mixture enters the contraction elbow 7 to accelerate, so that the gas-liquid mixture has enough speed after entering the cyclone separator 2, and the cyclone separation effect is improved. The accelerated gas-liquid mixture is tangentially introduced into the cyclone separator 2 from the gas inlet pipe 16 of the cyclone separator 2 and makes a rotational motion in the cyclone separator 2, resulting in that the contaminant-containing water droplets having a large inertial centrifugal force are thrown toward the inner wall of the cyclone separator 2. Upon striking the inner walls of the cyclone 2, the contaminant-laden water droplets will settle to the bottom of the cyclone 2 and be discharged from the waste outlet 14 for subsequent disposal. The gas stream freed from the majority of the contaminants is released from the exhaust duct 15 of the cyclone 2 into the environment of the construction site.

The exhaust gas purifying apparatus for a construction site of the present embodiment has at least the following advantages.

(1) High removal rate and low back pressure

The exhaust gas purifying apparatus of the present embodiment utilizes the exhaust gas discharged from the diesel generatorWith water atomization, the pollutant in the waste gas can be caught and dissolved to the water droplet, and the water droplet that will contain the pollutant is collected so that centralized processing through centrifugal separation again, and consequently, the exhaust gas purification equipment of this embodiment has higher clearance to the pollutant in the diesel generator waste gas. Table 1 shows the utility model discloses the exhaust gas purification equipment of two kinds of models that people independently researched and developed is to the diesel generator exhaust gas clearance test result of different capacity. The two types of waste gas purification equipment are respectively named as VC/50-200 and VC/270-350, wherein the VC/50-200 type waste gas purification equipment is suitable for a diesel generator with the capacity of 50-200kVA, and the VC/270-350 type waste gas purification equipment is suitable for a diesel generator with the capacity of 270-350 kVA. The two models of exhaust gas purification devices differ mainly in size. The data in Table 1 show that the exhaust gas purifying apparatus of the present embodiment can substantially remove most of HCs, NO in the exhaust gas discharged from the diesel generator _x 、SO₂And CO₂And the like.

Table 2 shows the utility model discloses the exhaust gas purification equipment of two kinds of models that people independently researched and developed is to the diesel generator's of different capacity backpressure test result. Generally speaking, the back pressure allowable value of the diesel generator does not exceed 20kPa, and the back pressure allowable value of the diesel generator of some manufacturers does not exceed 6.7-10.2 kPa. The data of table 2 show that the back pressure of the exhaust gas purifying apparatus of the present embodiment is much lower than the allowable value.

(2) System integration

The base 17 is horizontally fixed on the top of the diesel generator, and the air inlet pipe 3 of the Venturi tube 1 is connected to the exhaust pipe 15 of the diesel generator through a metal pipe or a hose capable of resisting the high temperature of more than 800 ℃. The waste discharge port 14 of the cyclone separator 2 is connected to an oil collector through a pipeline, the oil collector is connected with a waste water treatment device on a construction site, and the waste water treatment device is connected with the water injection port 8 of the venturi tube 1. The waste liquid discharged from the cyclone 2 contains particulate matter, oily substances, sulfate, nitrate, and the like. The oil collector can remove oily substances in the waste liquid, and the oily substances are collected and specially treated. The remaining water in the oil trap is free of oil and the deoiled wastewater is treated in a wastewater treatment unit. The waste gas purification equipment is integrated into a waste water treatment device on a construction site, and water obtained by the waste water treatment device can be reused by the waste gas purification equipment to form a circulating system formed by the generator, the waste gas purification equipment, the oil collector and the waste water treatment device.

(3) Safety and reduced heat emissions

The utility model discloses an exhaust gas purification equipment can eliminate spark/flame and reduce exhaust temperature to eliminate conflagration/explosion danger. This is of crucial importance when using diesel generators in semi-enclosed/closed work sites, such as underground or tunnel construction. To some extent, the use of diesel generators on construction sites exacerbates the hot on-site problem because hot exhaust gases (up to temperatures above 500 ℃) are constantly released into the workplace environment. The utility model discloses a waste gas purification equipment uses the medium of water as the pollutant in catching diesel engine waste gas. When water comes into contact with hot exhaust gas, the water evaporates and lowers the exhaust gas temperature. In fact, this cooling effect is similar to commercial water mist cooling systems that are widely used outdoors to reduce the temperature of a space.

Fig. 5 shows a comparison of exhaust gas temperatures of the diesel generator with and without the exhaust gas purifying apparatus of the present embodiment. Referring to fig. 5, even when the temperature of the exhaust gas generated by the generator reaches 500 ℃, the exhaust gas purifying apparatus of the present invention can still reduce the temperature of the exhaust gas to below 80 ℃, thereby greatly reducing the heat discharged from the generator to the working environment.

Example 2

To meet the power requirements of a construction site, generators of various capacities should be provided. Assuming that a construction site is equipped with 7 types of generators, the capacity varies from 50kVA to 350 kVA. If each type of generator is equipped with a custom-made exhaust gas purification device, a total of 7 types of exhaust gas purification devices should be designed and manufactured. This is a good configuration from a use point of view, but this option lacks flexibility and increases manufacturing costs.

A second object of the present disclosure is to provide an exhaust gas purifying apparatus having more flexibility. For the purpose of this embodiment, the design is modified by incorporating a new concept of interchangeable parts. Fig. 6 schematically shows a partial schematic view at the throat of an exhaust gas purification apparatus. Figure 7 schematically illustrates a partially expanded view of the junction of the constricted elbow and the inlet tube. Referring to fig. 6-7, the interchangeable sections include two main sections:

(i) a throat pipe 5: the throat pipe 5 is detachably connected with the contraction pipe 4 and the diffusion pipe 6;

(ii) the orifice plate 18: a detachable pore plate 18 is additionally arranged between the narrow end of the contraction elbow 7 of the Venturi tube 1 and the air inlet pipe 16 of the cyclone separator 2, and a rectangular hole 19 is arranged on the pore plate 18.

The dimensions of the throat 5 and the rectangular aperture 19 of the aperture plate 18 are critical in determining the efficiency of contaminant removal and the back pressure of the exhaust gas cleaning device. For example, a suitable throat 5 cross-section may ensure that the incoming gas has sufficient velocity and residence time to atomize the injected water. The rectangular aperture 19 of the aperture plate 18 is sized to regulate the tangential velocity of the gas flow mixture entering the cyclone 2. Without sufficient velocity, the droplets may flow directly through the cyclone 2, thereby adversely affecting the efficiency of contaminant removal.

The exhaust gas purification device for the construction site has universality, and diesel generators with various capacities can use the exhaust gas purification devices of the same type and are only different in specifications of the throat pipe 5 and the pore plate 18, so that the higher pollutant removal rate can be ensured, and the manufacturing cost can be favorably reduced. For example, suppose a construction site has 8 diesel generators of 50kVA, 60kVA, 75kVA, 100kVA, 200kVA, 270kVA, 350kVA and 450kVA respectively. The diesel power generation of the 8 capacities is classified into a low capacity diesel generator (50-200 kVA), a medium capacity diesel generator (270-350 kVA) and a high capacity diesel generator (450 kVA or more). One type of exhaust gas purification device can be designed for each of the three diesel generators, and the throat pipe 5 and the orifice plate 18 can be matched with the diesel generator with each capacity, so that the manufacturing cost is reduced.

The venturi tube 1 may be made of a 5mm stainless steel plate. For an exhaust gas purifying apparatus suitable for a low-capacity diesel generator, the cross-sectional size of the straight tube portion of the throat 5 and the size of the rectangular hole 19 of the orifice plate 18 thereof are one of the following combinations: (a) the cross section of the straight pipe part of the throat pipe 5 is 80 x 80mm, the size of the rectangular hole 19 of the orifice plate 18 is 70 x 75mm, and the combination is particularly suitable for a diesel generator with the capacity of 50-60 kVA; (b) the cross section of the straight pipe part of the throat pipe 5 is 100 multiplied by 100mm, the size of the rectangular hole 19 of the orifice plate 18 is 90 multiplied by 75mm, and the combination is particularly suitable for a diesel generator with the capacity of 70-100 kVA; (c) the straight tube part of the throat 5 has a cross-sectional dimension of 130 x 130mm and the rectangular aperture 19 of the aperture plate 18 has a dimension of 150 x 75mm, which combination is particularly suitable for use in a diesel generator having a capacity of 200 kVA.

For an exhaust gas purifying apparatus suitable for a medium-capacity diesel generator, the cross-sectional dimension of the straight pipe portion of the throat pipe 5 and the dimension of the rectangular hole 19 of the orifice plate 18 are one of the following combinations: (d) the cross section of the straight pipe part of the throat pipe 5 is 130 x 130mm, the size of the rectangular hole 19 of the orifice plate 18 is 120 x 90mm, and the combination is particularly suitable for a 270kVA diesel generator; (e) the straight pipe part of the throat pipe 5 has the cross section size of 160 x 160mm, and the rectangular hole 19 of the orifice plate 18 has the size of 175 x 90mm, and the combination is particularly suitable for a diesel generator with the capacity of 350 kVA.

For an exhaust gas purifying apparatus suitable for a high capacity diesel generator, the cross-sectional size of the straight tube portion of the throat 5 and the size of the rectangular hole 19 of the orifice plate 18 are in the following combination: (f) the cross section of the straight pipe part of the throat pipe 5 is 200 x 200mm, the size of the rectangular hole 19 of the orifice plate 18 is 250 x 125mm, and the combination is particularly suitable for a diesel generator with the capacity of 450kVA or more.

Table 3 lists six combinations from (a) to (f), and dimension a in table 3 and fig. 6 indicates the cross-sectional length and width of the straight tube portion of the throat pipe, dimension B in table 3 and fig. 7 indicates the length of the rectangular hole 19 of the orifice plate 18, and dimension C indicates the width of the rectangular hole 19 of the orifice plate 18.

Example 3

Generators are one of the loud devices common in construction sites. The main noise sources of the generator are exhaust noise and engine noise, which are usually dominant.

A third object of the present disclosure is to provide an exhaust gas purifying apparatus that reduces noise. The exhaust gas purifying apparatus of the present embodiment satisfies the following features: the length of the interior of the cylinder 12 of the cyclone 2L _m Inner diameter of cylinder 12D _b Inner diameter of exhaust pipe 15D _e The following relationship is satisfied:

the exhaust gas purifying apparatus satisfying the above relation can reduce exhaust noise of the diesel generator. For example, the length of the interior of the cylinder 12 of the cyclone separator 2L _m 1500mm, inner diameter of the cylinder 12D _b 300mm, inner diameter of the exhaust pipe 15D _e The cyclone separator 2 was applied to a 100kVA diesel generator with a load factor of 75% at 150mm, and it was found through testing that the acoustic power of the 100kVA diesel generator was reduced from 99.5dB (A) to 97dB (A), i.e. 2.5dB (A). In general, a 3dB (A) reduction in acoustic power means that the acoustic energy is halved (i.e., -50%). Therefore, the exhaust noise of the diesel engine can be reduced.

What has been described above are only some embodiments of the invention. For those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which are within the scope of the invention.

Claims (10)

1. An exhaust gas purifying apparatus for a construction site, comprising:

the Venturi tube comprises an air inlet pipe, a contraction pipe, a throat pipe, a diffusion pipe and a contraction bent pipe which are sequentially connected, and the pipe wall of the contraction pipe is provided with a water injection port;

cyclone, cyclone includes the drum, be equipped with into trachea, blast pipe and waste discharge port on the drum, wherein it is located to go into the trachea one end of drum just follows the tangential direction setting of drum, the blast pipe sets up the other end of drum, the narrow end of shrink return bend with it links to each other to go into the trachea.

2. The exhaust gas purifying apparatus for construction sites of claim 1, wherein the cross-sections of the inlet pipe, the contraction pipe, the throat pipe, the diffusion pipe and the contraction elbow pipe are square.

3. The exhaust gas purifying apparatus for construction sites as claimed in claim 1, wherein the inlet pipe is connected to a wide end of the contraction pipe, one end of the throat pipe is connected to a narrow end of the contraction pipe, the other end is connected to a narrow end of the diffusion pipe, and a wide end of the diffusion pipe is connected to a wide end of the contraction elbow pipe.

4. The exhaust gas purifying apparatus for a construction site as claimed in claim 1, wherein the venturi tube and the cyclone are disposed in parallel and horizontally.

5. The exhaust gas purifying apparatus for construction sites as claimed in claim 4, wherein the exhaust port and the gas inlet pipe are located at the same end of the cylinder, the cyclone separator forms an angle of 3-5 ° with the horizontal plane, and the end of the exhaust pipe is higher than the end of the exhaust port.

6. The exhaust gas purification apparatus for construction sites as claimed in claim 1, wherein a vortex guide is provided in the cylinder coaxially with the cylinder, the vortex guide is cylindrical, and a gap between the vortex guide and an inner wall of the cylinder is opposite to the intake pipe.

7. The exhaust gas purifying apparatus for a construction site as claimed in claim 1, wherein the exhaust pipe is a bent pipe, and an exhaust port of the exhaust pipe is directed upward.

8. The exhaust gas purifying apparatus for construction sites as set forth in claim 1, wherein one end of said throat pipe is detachably connected to a narrow end of said contraction pipe, the other end of said throat pipe is detachably connected to a narrow end of said diffusion pipe, and an orifice plate having a rectangular hole is detachably connected between the narrow end of said contraction elbow pipe and said air inlet pipe.

9. The exhaust gas purifying apparatus for a construction site as claimed in claim 8, wherein a cross-sectional size of the straight tube portion of the throat pipe and a rectangular hole size of the orifice plate are one of the following combinations: (a) the cross section of the straight pipe part of the throat pipe is 80 multiplied by 80mm, and the rectangular hole of the orifice plate is 70 multiplied by 75 mm; (b) the cross section of the straight pipe part of the throat pipe is 100 multiplied by 100mm, and the rectangular hole of the orifice plate is 90 multiplied by 75 mm; (c) the cross section of the straight pipe part of the throat pipe is 130 multiplied by 130mm, and the rectangular hole of the orifice plate is 150 multiplied by 75 mm; (d) the cross section of the straight pipe part of the throat pipe is 130 multiplied by 130mm, and the rectangular hole of the orifice plate is 120 multiplied by 90 mm; (e) the cross section of the straight pipe part of the throat pipe is 160 multiplied by 160mm, and the rectangular hole of the orifice plate is 175 multiplied by 90 mm; (f) the cross section of the straight pipe part of the throat pipe is 200 multiplied by 200mm, and the rectangular hole of the orifice plate is 250 multiplied by 125 mm.

10. The exhaust gas purifying apparatus for construction site as claimed in claim 1, wherein the cylinder has an inner cavity lengthL _m Inner diameter of cylinderD _b Inner diameter of exhaust pipeD _e The following relationship is satisfied: 6D _e ≤L _m ≤10D _e ，2D _e ≤D _b ≤2.5D _e 。

Images