High-pressure water cleaning waste recovery system

Abstract

The present invention discloses a high-pressure water cleaning waste recovery system, comprising a wastewater collection tank and a collection cover, wherein the collection cover is in a cylindrical or pocket shape with one end open and the other end closed, the open end is made of flexible material to be mounted on a heat exchanger, and a sewage outlet is provided at the lower part of the collection cover for discharging wastewater into the wastewater collection tank. When the system of the present invention is used for high-pressure water cleaning of heat exchangers, the working site environment is greatly improved, the phenomenon of wastewater flowing freely and waste splashing at the working site of high-pressure water cleaning in the past is changed, and the wastewater splashing on the cleaning personnel is prevented, thereby improving environmental protection and safety.

Description

Technical Field

[0001] The invention relates to a high-pressure water cleaning dirt recovery system, in particular to a device for collecting and protecting dirt when a heat exchanger is cleaned with high-pressure water. Background Art

[0002] High-pressure water cleaning is to use a plunger pump driven by a motor, diesel engine, etc. to pressurize to a high pressure, and then spray it out from a high-pressure spray gun to complete the cleaning. The jet of high-pressure water sprayed by the spray gun has huge striking energy, and the pressure reaches more than 500 bar, which can complete different types of cleaning and removal tasks. Using high-pressure water to clean petrochemical equipment can better maintain the performance of the equipment. It is widely used in internal cleaning work during the maintenance of petrochemical production equipment, which can improve the production capacity of the equipment.

[0003] Most of the heat exchange equipment used in chemical production equipment is shell and tube heat exchanger. After a period of operation, the heat conduction effect of the equipment deteriorates due to impurities and scale in the materials. In order to restore its heat conduction effect, the heat exchanger tube needs to be cleaned with high-pressure water regularly. During the high-pressure water cleaning process, especially for heat exchangers with materials in the tube, because the materials are attached to the inner wall of the tube, when cleaning with high-pressure water, the materials, debris and other dirt will be ejected with the high-pressure water flow and splashed around the equipment. The materials will adhere to the ground and surrounding equipment, and the mixture of dirty oil, debris and flushing water will flow freely, causing environmental pollution. In addition, some sewage will flow back from the cleaning end of the tube and splash onto the cleaning personnel operating the high-pressure water gun, so they usually have to wear raincoats and rain boots for cleaning.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The object of the present invention is to provide a high-pressure water cleaning waste recovery system to reduce or even eliminate environmental pollution caused by the arbitrary flow of wastewater when cleaning a heat exchanger with high-pressure water.

[0006] The high-pressure water cleaning waste recovery system of the present invention comprises a sewage collection tank and a collection cover. The collection cover is in the shape of a cylinder or a pocket with one end open and the other end closed. The open end is made of flexible material to be sleeved on the heat exchanger. A sewage outlet is provided at the bottom of the collection cover for discharging sewage into the sewage collection tank.

[0007] Furthermore, a splash-proof safety cover which can be installed at the other end of the heat exchanger is also packaged. The splash-proof safety cover is disc-shaped and has radial long holes and one or more plug-in parts which can be inserted into the tube array to reduce or avoid sewage splashing onto the cleaning personnel.

[0008] Preferably, the plug-in part is an expansion sleeve assembly installed in the middle of the splash-proof safety cover, an expansion plug is installed in the expansion tube of the expansion sleeve assembly, and an expansion nut is installed at one end of the expansion plug to ensure that the splash-proof safety cover is firmly mounted on the heat exchanger tubes through the expansion sleeve.

[0009] Preferably, the expansion sleeve assembly includes a sleeve, a swivel sleeve is installed on the sleeve, a locking nut is installed on the swivel sleeve for clamping the splashproof safety cover on the swivel sleeve, and a retaining ring and a limit nut are also provided on the sleeve to restrict the swivel sleeve between the two.

[0010] Furthermore, it also includes a water receiving trough for collecting sewage flowing down from the splash-proof safety cover, and the water receiving trough is connected to the sewage collecting trough through a pipeline.

[0011] Furthermore, the collecting cover is a pocket made of waterproof rain cloth or rubber film or plastic film, which is supported by a fixing frame.

[0012] Furthermore, the sewage collection tank is divided into multiple separation tanks by partitions, and the upper part of the partitions is a filter screen; when there are multiple partitions, the mesh size of the filter screen on the upper part of the partition increases from the inlet to the outlet of the sewage collection tank.

[0013] Furthermore, a filter screen is installed vertically on the upper part of the partition.

[0014] Furthermore, an inverted U-shaped tube is arranged at the lower part of the partition to connect the spaces on both sides of the partition.

[0015] A water outlet pipe and a water outlet valve are arranged in the middle of the sewage collecting tank, a drain pipe and a drain valve are arranged at the bottom, and an oil drain pipe and an oil drain valve are arranged at the top.

[0016] Furthermore, a pipeline pump and its inlet and outlet pipes may be included so as to be connected between the sewage collection tank and the collection cover and the water receiving tank to overcome the height difference.

[0017] The high-pressure water cleaning waste recovery system of the present invention is used for high-pressure water cleaning of heat exchangers. The wastewater ejected from one end of the heat exchanger is collected by a collection cover tied to the heat exchanger and converged into a wastewater collection tank to prevent this part of the wastewater from being ejected onto the ground and causing environmental problems. The splash-proof safety cover can prevent the wastewater refluxed from the heat exchanger tubes from directly splashing onto the cleaning personnel operating the high-pressure water gun, and the water receiving tank can further prevent this part of the wastewater from flowing onto the ground. The separation of oil, water, light floating objects and sediments can also be achieved through the partitions and filters in the wastewater collection tank and the inverted U-shaped tube arrangement. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the composition of the high-pressure water cleaning waste recovery system of the present invention.

[0019] Figure 2 This is the structural diagram of the sewage collection tank.

[0020] Figure 3 It is a schematic diagram of the structure of the splash-proof safety cover.

[0021] Figure 4 for Figure 3 Right view of .

[0022] Figure 5 It is a schematic diagram of the expansion sleeve assembly structure.

[0023] Figure 6 It is a schematic diagram of the expansion tube structure.

[0024] In the figure: 1. sewage collection tank, 2. pipeline, 3. fixing frame, 4. collecting cover, 5. binding belt, 6. sewage outlet, 7. water receiving trough, 8. splash-proof safety cover, 9. U-shaped pipe, 10. partition, 11. oil drain pipe, 12. drain pipe, 13. drain pipe, 14. disc, 15. limit nut, 16. expansion plug, 17. moving hole of high-pressure water gun, 18. sleeve, 19. limit retaining ring, 20. expansion tube, 21. locking nut, 22. swivel sleeve, 23. tension expansion nut. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments to help understand the content of the present invention.

[0026] like Figure 1 As shown, it is a preferred embodiment of the high-pressure water cleaning waste recovery system of the present invention. The whole system includes a sewage collection tank 1, which is used to collect the sewage generated after the high-pressure water cleaning of the heat exchanger, and further separate the water and oil; a collection cover 4, which is a cylindrical shape with one end closed and the other end open, and the open end is a flexible material such as a waterproof rain cloth, which is sleeved on one end of the heat exchanger and tied to the shell of the heat exchanger through a binding belt 6; a gantry-shaped fixing frame 3 is used to fix and support the collection cover 4, and the lowest part of the collection cover 4 has a sewage outlet 5 connected to the water inlet pipe of the sewage collection tank 1 through a pipe 2; a splash-proof safety cover 8 installed at the other end of the heat exchanger, and a water receiving tank 7 placed on the ground or base at the other end of the heat exchanger, the water receiving tank 7 is located below the splash-proof safety cover 8, and receives the sewage flowing from the splash-proof safety cover 8 and the end of the heat exchanger, and the water receiving tank 7 is also connected to the water inlet pipe of the sewage collection tank 1 through a pipe.

[0027] The working principle of the whole system is: before operation, tie the collection cover 4 to one end of the heat exchanger ( Figure 1The left end of the heat exchanger is the left end of the heat exchanger, and the other end (right end) of the heat exchanger is installed with a splash-proof safety cover 8 and a water tank 7. The sewage outlets of the collection cover 4 and the water tank 7 are connected to the sewage collection tank 1 by pipes. When the heat exchanger is cleaned with high-pressure water, the mixed liquid of the cleaned materials, dirt and water passes through the collection cover 4, the splash-proof safety cover 8, the water tank 7 and the sewage pipe 2 to collect it in the sewage collection tank 1. If the heat exchanger is installed on the device platform and there is a height difference of more than 1 meter with the sewage collection tank 1, a pipeline pump may not be installed. The height difference is used to make the cleaned dirty liquid flow to the sewage collection tank 1. If there is no height difference, a pipeline pump and its inlet and outlet pipes need to be installed. The inlet pipe is connected to the collection cover 4 and the water tank 7, and the outlet pipe is connected to the sewage collection tank 1. The dirty liquid is transported to the sewage collection tank 1.

[0028] If it is not considered or necessary to separate the sewage, the sewage collection tank can be an ordinary water tank. As in the petrochemical industry, especially when the material passes through the heat exchanger tube, there will be oil or material in the sewage, which can be recovered or processed separately. Therefore, as a preferred embodiment, the sewage collection tank of this embodiment is designed to have a separation function.

[0029] Figure 2 It is a preferred embodiment of the sewage collection tank. The sewage collection tank not only has the function of temporarily collecting sewage, but also can separate dirt. It is particularly suitable for heat exchangers of liquid chemical media such as dirty oil. The sewage collection tank is divided into four separation tanks by three partitions 10. An inverted U-shaped tube is arranged at the bottom of each partition to realize that adjacent separation tanks are connected by U-shaped tubes. The installation height of the U-shaped tube from the inlet end to the outlet end of the sewage collection tank is gradually reduced. Due to the different densities of dirty oil, chemical materials, water, etc., liquid materials such as dirty oil will float on the water, so that the dirt such as dirty oil, chemical materials and water are layered. An oil drain pipe 11 and its oil drain valve are installed on the upper part of the sewage collection tank, and a drain pipe 12 and its drain valve are installed in the middle. Due to the height difference of the discharge ports of dirty oil and water, the layered dirty oil and sewage flow out from their respective discharge ports to achieve the purpose of separate discharge. The inverted U-shaped tube changes the flow direction of the oily wastewater when it passes through each layer of the partition 10. For the oily wastewater, the water inlet direction is downward when entering the next separation tank, which prolongs the residence time and helps the oil-water separation. The installation position of the U-shaped tube is gradually lowered, and the residence time is also gradually extended, and the oil-water separation effect of the separation tank is gradually improved. Although the separation tanks can be connected in water by directly opening holes on the partition or leaving a certain distance between the bottom of the partition and the bottom of the tank, the effect of residence time control is lower than that of the inverted U-shaped tube method of this embodiment.

[0030] If the cleaning pipe is a heat exchanger for circulating water, the dirt cleaned is mainly scale, sludge and other impurities entrained in the circulating cooling water. The three partitions of the sewage collection tank are different from the oil separation. Each partition 10 is composed of a filter screen (omitted in the figure) at the top and a steel plate at the bottom. From the inlet to the outlet, the mesh number of the filter screen increases step by step. The scale and other solids with a density greater than water in the mixed liquid will settle at the bottom of the separation tank, and the impurities with a density less than water will be suspended above the water. The operator will use a filter screen or sieve to remove them according to the amount of impurities, and the small amount of fine suspended particles remaining in the water will be discharged with the water. The cleaning water discharged from the sewage separation tank is discharged into the sewage recovery system of the device, and the oil, solid impurities, etc. are bagged and recovered for centralized treatment. Sedimentary materials such as scale settle at the bottom of the isolation tank and are discharged by the drain pipe 13 and drain valve at the bottom of the sewage collection tank.

[0031] Two parallel channel steels are welded at the bottom of the sewage collection tank as supporting legs, which also facilitates the movement and loading and unloading of vehicles by forklifts.

[0032] like Figure 3 and Figure 4 As shown, it is a preferred embodiment of the splash-proof safety cover. The splash-proof safety cover 8 adopts a transparent plastic disc 14, where the disc refers to a disc with a raised edge like a plate used as tableware. There is a radial long hole on the splash-proof safety cover as a high-pressure water gun moving hole 17, and an expansion sleeve assembly is installed at its center. The main body of the expansion sleeve assembly is a sleeve 18. The disc 14 is installed on the sleeve through a limit nut 15 on the sleeve 18 and can rotate around the sleeve 18. If the sleeve 18 is long enough, the sleeve 18 can be directly inserted into the tube of the shell-and-tube heat exchanger, and the disc 14 can be installed at the end of the heat exchanger. In this installation method, even multiple sleeves can be used to insert into multiple tubes to improve the stability of the installation.

[0033] This embodiment, as a preferred embodiment, takes into account the firmness of installation and the convenience of use, and adopts an expansion sleeve assembly. The advantage of the expansion sleeve assembly is that the installation is more firm and no axial movement will occur during use. At the same time, the depth of insertion into the tube array does not need to be too deep, 40 or 50 mm is sufficient, which is more advantageous for fixing the tube array that is severely blocked.

[0034] like Figure 5 As shown, the expansion sleeve assembly includes a sleeve 18, and the front end of the sleeve 18 is a limit ring 19 used to stop at the end of the tube when inserting the tube to ensure the consistency of the insertion depth, so as to ensure that the disc 14 has the required fixed distance from the end of the heat exchanger, and at the same time provide a force acting surface to reduce the force of the inserted part. The middle part of the sleeve 18 also has a limit ring and a limit nut 15 at the end, which assembles and limits a rotating sleeve 22, and the rotating sleeve 22 can rotate around the sleeve 18. The rotating sleeve 22 is equipped with a locking nut 21, which is used to clamp the disc 14 on the rotating sleeve 22 to facilitate the rotation of the disc during operation.

[0035] An expansion plug 16 is installed in the sleeve 18. One end of the expansion plug 16 corresponding to the expansion end of the expansion sleeve assembly (the left end in the figure) adopts an enlarged structure, and the other end is a threaded end that passes through the right end of the sleeve 18 and is installed with a tension nut 23.

[0036] The sleeve 18 can be directly Figure 5 The left end is configured as an expandable structure, so that the right end of the sleeve 18 can be directly squeezed by the expansion plug to expand it onto the heat exchanger tubes. However, due to the structural requirements of the sleeve 18 as the expansion sleeve assembly in this embodiment, and in order to improve the utilization rate and the convenience of loading and unloading, a separate expansion tube 20 is used, and its structure is as follows: Figure 6 As shown, a round tube with multiple axial slits at one end is provided to facilitate expansion under stress. The material of the round tube can be plastic, copper, steel or other easily deformable and / or elastic material, which is not affected by the material of the sleeve 18. After repeated use and damage, only the expansion tube 20 needs to be replaced.

[0037] Reference Figure 1 In the manner shown, during installation, the left end of the expansion sleeve assembly is inserted into a tube in the middle of the tube heat exchanger, and the expansion nut 23 at the right end of the expansion plug 16 is tightened. The nut generates a pulling force to pull the expansion plug 16 to the right in the figure, and the expansion structure at the left end of the expansion plug 16 squeezes the expansion end with the axial notch at the left end of the expansion tube 20 outward, so that it expands and supports the inner wall of the tube of the heat exchanger, as shown in FIG. Figure 1 The high-pressure water gun is inserted into the tubes of the tube heat exchanger through the high-pressure water gun moving hole 17 to perform high-pressure water cleaning. Most of the high-pressure water is washed away with the dirt and dirt. Figure 1 The left end of the heat exchanger flows out into the collection cover 4, and another part flows out from Figure 1 The right end of the middle heat exchanger sprays out in the opposite direction, splashes onto the disc 14 of the splash-proof safety cover 8, and then flows down along its surface into the water receiving tank. After cleaning one tube, the radial position of the high-pressure water gun in the tube heat exchanger can be changed along the high-pressure water gun moving hole 17, and the angle of the high-pressure water gun moving hole 17 can be changed by rotating the splash-proof safety cover, so as to realize the cleaning of the tubes of the tube heat exchanger except the tubes with the expansion tubes installed. After loosening the expansion nut 23, push the expansion plug 16 inward, and the expansion end of the expansion tube 20 will be closed under the action of elasticity, and then the expansion sleeve assembly and the splash-proof safety cover can be removed.

[0038] The collecting cover can be made of waterproof rain cloth or rubber or plastic to form a pocket shape. Since it is a flexible material, it can be put on heat exchangers of different diameters and installed and fixed by tying the mouth. The bottom can be supported from the inside by a steel ring to form a circle, or directly supported from the outside by a fixing frame 3 to form a circle. Of course, the main body can also be a plastic or steel cylinder with a bottom, and a circle of waterproof rain cloth or rubber or plastic cylinder can be fixed on the mouth of the cylinder to facilitate installation and tying.

[0039] The high-pressure water cleaning waste recovery system of the present invention realizes the collection of wastewater when the heat exchanger is cleaned with high-pressure water, and can also be separated. The water can be directly discharged into the ditch, the separated waste residue can be bagged, and the dirty oil can be barreled. The high-pressure water cleaning waste recovery system has the expected effect in the application of cleaning equipment in petrochemical plants, and the working site environment has been greatly improved, changing the previous phenomenon of wastewater flowing freely and waste splashing at the high-pressure water cleaning site.

Claims

1. A high-pressure water cleaning waste recovery system, characterized in that: It includes a sewage collection tank and a collection cover, the collection cover is a cylindrical or pocket-shaped one end of which is open and the other end is closed, the open end is made of flexible material to be sleeved on the heat exchanger, and a sewage outlet is provided at the lower part of the collection cover for discharging sewage into the sewage collection tank; it also includes a splash-proof safety cover that can be installed on the other end of the heat exchanger, the splash-proof safety cover is a transparent disc with a raised edge, and a radial long hole is opened on it as a moving hole for a high-pressure water gun, and one or more plug-in parts on the splash-proof safety cover that can be inserted into the array of tubes, and the long hole radially extends from the plug-in part at the center position of the splash-proof safety cover to the edge position of the splash-proof safety cover; it also includes a water receiving trough for collecting sewage flowing down from the splash-proof safety cover, and the water receiving trough is connected to the sewage collection tank through a pipeline; the plug-in part is an expansion sleeve assembly installed in the middle of the splash-proof safety cover, the expansion sleeve assembly includes a sleeve and an expansion tube at the front end of the sleeve, an expansion plug is installed in the expansion tube of the expansion sleeve assembly, and a tension expansion nut is installed at one end of the expansion plug, and the splash-proof safety cover is installed on the sleeve and can rotate around the sleeve.

2. The high-pressure water cleaning waste recovery system according to claim 1, characterized in that: A rotating sleeve is installed on the sleeve, and a locking nut is installed on the rotating sleeve for clamping and assembling the splash-proof safety cover on the rotating sleeve. A retaining ring and a limiting nut are also provided in the middle of the sleeve to limit the rotating sleeve between the two.

3. The high pressure water cleaning waste recovery system according to claim 1, characterized in that: The collecting cover is a pocket made of waterproof rain cloth or rubber film or plastic film, and is supported by a fixing frame.

4. The high pressure water cleaning waste recovery system according to any one of claims 1 to 3, characterized in that: The sewage collection tank is divided into multiple separation tanks by partitions, and the upper part of the partitions is a filter screen; when there are multiple partitions, the mesh number of the filter screen at the upper part of the partition increases from the inlet to the outlet of the sewage collection tank.

5. The high pressure water cleaning waste recovery system according to any one of claims 1 to 3, characterized in that: The sewage collection tank is divided into a plurality of separation tanks by a partition, and the lower part of the partition is provided with an inverted U-shaped pipe to connect the spaces on both sides of the partition.

6. The high pressure water cleaning waste recovery system according to claim 5, characterized in that: From the inlet end to the outlet end of the sewage collection tank, the installation height of the inverted U-shaped pipe decreases step by step.

7. The high pressure water cleaning waste recovery system according to claim 4, characterized in that: The sewage collecting tank is provided with a water outlet pipe and a water outlet valve in the middle, a drain pipe and a drain valve at the bottom, and an oil drain pipe and an oil drain valve at the top.

8. The high pressure water cleaning waste recovery system according to any one of claims 1 to 3, characterized in that: It also includes a pipeline pump and its inlet and outlet pipes, the inlet pipe is connected to the collection cover and / or the water receiving tank, and the outlet pipe is connected to the sewage collection tank.

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