Nested through-flow cleaning head

Abstract

The nested through-flow cleaning head comprises an outer pipe and an inner pipe, the outer pipe and the inner pipe are both arranged horizontally in the left-right direction, the outer pipe is concentrically sleeved on the outside of the inner pipe, both ends of the outer pipe and the inner pipe are blocked, the two ends of the outer pipe are welded and fixedly connected to the outer circumference of the inner pipe, the inner pipe constitutes a high-pressure water flow space, the annular cavity between the outer pipe and the inner pipe constitutes a low-pressure water flow space, a spray cleaning device connected to the high-pressure water flow space and the low-pressure water flow space is fixedly installed on the rear wall of the outer pipe, a low-pressure water inlet pipe is welded on the right side of the middle of the front wall of the outer pipe, a high-pressure water inlet pipe is welded on the left side of the middle of the front wall of the inner pipe, the high-pressure water inlet pipe passes forward through the front wall of the outer pipe and is sealed and fixedly connected to the front wall of the outer pipe. The invention has a reasonable structure and a scientific design, can push away the circulating water in the corresponding heat exchange tube in advance, form a downstream water space, has a good cleaning effect, and has low energy consumption.

Description

Technical Field

[0001] The invention relates to the technical field of condenser cleaning, in particular to a nested through-flow cleaning head. Background Art

[0002] The condenser is an important component of the cold end device of a modern thermal power plant. Its main function is to quickly condense the steam after it has done work in the turbine into water, so that the turbine exhaust port can establish and maintain a certain vacuum degree to improve the power generation efficiency. If the vacuum degree at the turbine exhaust port is too low, it will seriously affect the safe and economic operation of the power plant unit. An important reason for the low vacuum degree at the turbine exhaust port is the scaling of the condenser heat exchange tubes and the dust precipitation therein. The scaling and dust precipitation of the condenser will have a serious impact on the heat exchange efficiency of the condenser, and will also cause corrosion of the condenser tubes, which is a safety hazard.

[0003] Condenser online cleaning robots came into being. However, the cleaning heads of existing online cleaning robots only inject high-pressure water jets into the heat exchange tubes on the condenser tube plates, and fail to pre-push away the circulating water in the corresponding heat exchange tubes, resulting in poor cleaning effects and high energy consumption. Summary of the invention

[0004] The purpose of the present invention is to provide a nested through-flow cleaning head, which has a reasonable structure and scientific design, can push away the circulating water in the corresponding heat exchange tubes in advance to form a downstream water space, has a good cleaning effect and low energy consumption.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] The nested flow cleaning head is installed on a vertical elevator in the condenser water chamber through a forward and backward moving mechanism, and includes an outer pipe and an inner pipe. The outer pipe and the inner pipe are both horizontally arranged in the left and right directions. The outer pipe is concentrically sleeved on the outside of the inner pipe. Both ends of the outer pipe and the inner pipe are blocked. The two ends of the outer pipe are welded and fixedly connected to the outer circumference of the inner pipe. The interior of the inner pipe constitutes a high-pressure water flow space, and the annular cavity between the outer pipe and the inner pipe constitutes a low-pressure water flow space. A spray cleaning device that is respectively connected to the high-pressure water flow space and the low-pressure water flow space is fixedly installed on the rear wall of the outer pipe. A low-pressure water inlet pipe that is connected to the low-pressure water flow space and is horizontally arranged in the front-to-back direction is welded on the right side of the middle of the front wall of the outer pipe. A high-pressure water inlet pipe that is connected to the high-pressure water flow space and is horizontally arranged in the front-to-back direction is welded on the left side of the middle of the front wall of the inner pipe. The high-pressure water inlet pipe passes forward through the front wall of the outer pipe and is sealed and fixedly connected to the front wall of the outer pipe.

[0007] The spray cleaning device includes an arc plate, which is welded to the rear side wall of the outer pipe, the front side of the arc plate is an arc surface that is tightly fitted with the rear side wall of the outer pipe, the rear side of the arc plate is a vertical plane, a sealing plate is fixedly connected to the rear side of the arc plate by a plurality of screws, a rigid plate parallel to the sealing surface of the sealing plate is nested in the sealing plate, two rows of welded column holes spaced up and down are opened on the rear side wall of the inner pipe, two rows of circular holes spaced up and down are opened on the rear side wall of the outer pipe, and the arc plate, the sealing plate and the rigid plate are all opened There are two rows of flow holes spaced apart from each other. The spatial arrangement of the welded column holes, circular holes and flow holes is consistent with the spatial arrangement of the heat exchange tubes on the condenser tube plate. Each welded column hole, each circular hole and each flow hole is arranged in a front-to-back correspondence. A high-pressure rotating nozzle connected to the high-pressure water flow space is threadedly installed in each welded column hole. The rear end of the high-pressure rotating nozzle passes backward through the corresponding circular hole and is located in the corresponding flow hole. The outer diameter of the high-pressure rotating nozzle is smaller than the aperture of the circular hole to facilitate the low-pressure water to flow out and enter the heat exchange tube.

[0008] Several connecting seats are welded on the front wall of the outer pipe, which are spaced apart on the left and right and fixedly connected to the front and rear moving mechanism. The upper parts of the two connecting seats located in the middle and symmetrical on the left and right are fixedly installed with underwater high-definition explosion-proof cameras that are located above the outer pipe and shoot toward the condenser tube plate. Two sights that are spaced apart on the left and right are fixedly installed on the upper side of the arc plate. The two sights are respectively arranged directly behind the two underwater high-definition explosion-proof cameras, and the crosshairs of the sights correspond to the front and back of the center of a corresponding heat exchange tube on the condenser tube plate.

[0009] The sealing plate is made of silicone rubber or fluororubber.

[0010] The present invention has substantial characteristics and progress compared with the prior art. Specifically, the underwater high-definition explosion-proof camera of the present invention captures the operating conditions in the condenser water chamber in real time and transmits the captured images to a computer outside the condenser water chamber, so that the operating conditions in the condenser water chamber can be observed through the display screen of the computer outside the condenser water chamber, and each high-pressure rotating nozzle can be accurately positioned outside the condenser water chamber with the help of a sight. The nested through-flow cleaning head moves up and down under the action of the vertical lift until a certain cleaning position, and each high-pressure rotating nozzle corresponds front and back to the corresponding heat exchange tube orifices on the condenser tube sheet at the cleaning position, and the vertical lift stops moving, thereby locking the nested through-flow cleaning head, and then the nested through-flow cleaning head is pushed toward the condenser tube sheet by the forward and backward moving mechanism, and the sealing plate is pressed against the condenser tube sheet, and the sealing plate seals the corresponding heat exchange tube orifices on the condenser tube sheet at the cleaning position. At this time, low-pressure water enters the low-pressure water flow space through the low-pressure water inlet pipe, and the low-pressure water then passes through each circular hole and each through hole. The flow holes are injected into the corresponding heat exchange tubes to push away the circulating water in the heat exchange tubes to form a downstream water space. When the downstream water space is formed, high-pressure water is allowed to enter the high-pressure water flow space through the high-pressure water inlet pipe. The high-pressure water then passes through each high-pressure rotating nozzle to form a rotating high-pressure water jet and is injected into the corresponding heat exchange tubes. A rotating and forward high-speed water flow is formed in the heat exchange tubes to clean the walls of the corresponding heat exchange tubes. The cleaning effect is good. The formation of the downstream water space can reduce the energy consumption when the high-pressure water is supplied. When the corresponding After the cleaning of each heat exchange tube is completed, the supply of high and low pressure water is stopped, and the forward and backward moving mechanism is controlled to drive the nested through-flow cleaning head to move forward away from the condenser tube sheet. In this way, one cleaning step is completed, and then the nested through-flow cleaning head is driven by the vertical lift to move to the next cleaning position. Each high-pressure rotating nozzle corresponds to the corresponding heat exchange tube orifice on the condenser tube sheet at the cleaning position. Then the above cleaning steps are repeated, and then each heat exchange tube at the cleaning position is cleaned until all the heat exchange tubes are cleaned.

[0011] In summary, the present invention has a reasonable structure and a scientific design, and can push away the circulating water in the corresponding heat exchange tubes in advance to form a downstream water space, thereby achieving a good cleaning effect and low energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a rear view of the present invention.

[0013] Figure 2 It is a top view of the present invention.

[0014] Figure 3 It is a left side view of the present invention.

[0015] Figure 4 yes Figure 2 AA section view.

[0016] Figure 5 yes Figure 2 Middle BB section view.

[0017] Figure 6 It is a cross-sectional schematic diagram of the present invention. DETAILED DESCRIPTION

[0018] The embodiments of the present invention are further described below with reference to the accompanying drawings.

[0019] like Figure 1-6 As shown, the nested flow cleaning head is installed on the vertical lift in the condenser water chamber through a forward and backward moving mechanism, and includes an outer pipe 1 and an inner pipe 2. The outer pipe 1 and the inner pipe 2 are both horizontally arranged in the left and right directions. The outer pipe 1 is concentrically sleeved on the outside of the inner pipe 2. Both ends of the outer pipe 1 and the inner pipe 2 are blocked. Both ends of the outer pipe 1 are welded and fixedly connected to the outer circumference of the inner pipe 2. The interior of the inner pipe 2 constitutes a high-pressure water flow space 3, and the annular cavity between the outer pipe 1 and the inner pipe 2 constitutes a low-pressure water flow space 4. A spraying device connected to the high-pressure water flow space 3 and the low-pressure water flow space 4 respectively is fixedly installed on the rear wall of the outer pipe 1. A low-pressure water inlet pipe 5 connected to the low-pressure water flow space 4 and arranged horizontally along the front-to-back direction is welded to the right middle part of the front wall of the outer pipe 1. A high-pressure water inlet pipe 6 connected to the high-pressure water flow space 3 and arranged horizontally along the front-to-back direction is welded to the left middle part of the front wall of the inner pipe 2. The high-pressure water inlet pipe 6 passes forward through the front wall of the outer pipe 1 and is sealed and fixedly connected to the front wall of the outer pipe 1.

[0020] The spray cleaning device includes an arc plate 7, which is welded to the rear side wall of the outer pipe 1. The front side of the arc plate 7 is an arc surface that is tightly fitted with the rear side wall of the outer pipe 1. The rear side of the arc plate 7 is a vertical plane. A sealing plate 8 is fixedly connected to the rear side of the arc plate 7 by a plurality of screws. A rigid plate 9 parallel to the sealing surface of the sealing plate 8 is nested in the sealing plate 8. Two rows of welding column holes spaced up and down are opened on the rear side wall of the inner pipe 2. Two rows of circular holes spaced up and down are opened on the rear side wall of the outer pipe 1. Two arc plates 7, sealing plates 8 and rigid plates 9 are all opened. The flow holes 10 are arranged in an upper and lower interval pattern, and the spatial arrangement of the welded column holes, the circular holes and the flow holes 10 is consistent with the spatial arrangement of the heat exchange tubes 15 on the condenser tube plate. Each welded column hole, each circular hole and each flow hole 10 is arranged in a front-to-back correspondence. A high-pressure rotating nozzle 11 connected to the high-pressure water flow space 3 is threadedly installed in each welded column hole. The rear end of the high-pressure rotating nozzle 11 passes backward through the corresponding circular hole and is located in the corresponding flow hole 10. The outer diameter of the high-pressure rotating nozzle 11 is smaller than the aperture of the circular hole, so that the low-pressure water can flow out and enter the heat exchange tube 15.

[0021] Several connecting seats 12 are welded on the front tube wall of the outer pipe 1, which are arranged at intervals on the left and right and fixedly connected to the front and rear moving mechanism. The upper parts of the two connecting seats 12 located in the middle and symmetrical on the left and right are fixedly installed with underwater high-definition explosion-proof cameras 13 located above the outer pipe 1 and facing the condenser tube plate. Two sights 14 arranged at intervals on the left and right are fixedly installed on the upper side of the arc plate 7. The two sights 14 are respectively arranged directly behind the two underwater high-definition explosion-proof cameras 13, and the front sight of the sight 14 corresponds to the front and rear center of a corresponding heat exchange tube 15 on the condenser tube plate.

[0022] The sealing plate 8 is made of silica gel or fluoro rubber.

[0023] The high-pressure rotating nozzle 11, the underwater high-definition explosion-proof camera 13 and the sight 14 are all existing conventional technologies and can be purchased on the market. The specific structure and working principle will not be described in detail.

[0024] The underwater high-definition explosion-proof camera 13 of the present invention takes real-time photos of the operating conditions in the condenser water chamber and transmits the captured images to a computer outside the condenser water chamber, so that the operating conditions in the condenser water chamber can be observed through the display screen of the computer outside the condenser water chamber, and each high-pressure rotating nozzle 11 can be accurately positioned outside the condenser water chamber in conjunction with the sighting device 14. Under the action of the vertical lift, the nested through-flow cleaning head moves up and down until a certain cleaning position is reached, and each high-pressure rotating nozzle 11 is aligned with the condenser pipe at the cleaning position. The corresponding heat exchange tubes 15 on the plate are arranged front and back in correspondence, the vertical lift stops moving, and the nested through-flow cleaning head is locked, and then the nested through-flow cleaning head is pushed toward the condenser tube sheet by the front and back moving mechanism, and the sealing plate 8 is made close to the condenser tube sheet, and the sealing plate 8 seals the corresponding heat exchange tubes 15 on the condenser tube sheet at the cleaning position. At this time, the low-pressure water enters the low-pressure water flow space 4 through the low-pressure water inlet pipe 5, and the low-pressure water is then injected into the corresponding heat exchange tubes 15 through the various circular holes and the various through-flow holes 10. In the process, the circulating water in the heat exchange tube 15 is pushed away to form a downstream water space. When the downstream water space is formed, high-pressure water is allowed to enter the high-pressure water flow space 3 through the high-pressure water inlet pipe 6. The high-pressure water is then injected into the corresponding heat exchange tubes 15 through each high-pressure rotating nozzle 11 to form a rotating high-pressure water jet, forming a rotating and forward high-speed water flow in the heat exchange tube 15 to clean the wall of the corresponding heat exchange tube 15. The cleaning effect is good. The formation of the downstream water space can reduce the energy consumption when the high-pressure water is supplied. When the corresponding heat exchange tubes at the cleaning position After the cleaning is completed, the supply of high and low pressure water is stopped, and the forward and backward moving mechanism is controlled to drive the nested through-flow cleaning head to move forward away from the condenser tube sheet. In this way, one cleaning step is completed, and then the nested through-flow cleaning head is driven to move to the next cleaning position by the vertical lift. Each high-pressure rotating nozzle 11 corresponds to the front and back of the corresponding heat exchange tubes 15 on the condenser tube sheet at the cleaning position. Then the above cleaning steps are repeated, and then the heat exchange tubes 15 at the cleaning position are cleaned until all the heat exchange tubes 15 are cleaned.

[0025] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. The nested through-flow cleaning head is installed on a vertical lift in the condenser water chamber through a forward and backward moving mechanism, and is characterized by: It comprises an outer pipe and an inner pipe, both of which are arranged horizontally along the left-right direction, the outer pipe is concentrically sleeved on the outside of the inner pipe, both ends of the outer pipe and the inner pipe are blocked, both ends of the outer pipe are welded and fixedly connected to the outer circumference of the inner pipe, the interior of the inner pipe constitutes a high-pressure water flow space, the annular cavity between the outer pipe and the inner pipe constitutes a low-pressure water flow space, a spraying device connected with the high-pressure water flow space and the low-pressure water flow space is fixedly installed on the rear wall of the outer pipe, a low-pressure water inlet pipe connected with the low-pressure water flow space and arranged horizontally along the front-to-back direction is welded on the right side of the middle of the front wall of the outer pipe, a high-pressure water inlet pipe connected with the high-pressure water flow space and arranged horizontally along the front-to-back direction is welded on the left side of the middle of the front wall of the inner pipe, the high-pressure water inlet pipe passes forward through the front wall of the outer pipe and is sealed and fixedly connected with the front wall of the outer pipe.

2. The nested through-flow cleaning head according to claim 1, characterized in that: The spray cleaning device includes an arc plate, which is welded to the rear side wall of the outer pipe, the front side of the arc plate is an arc surface that is tightly fitted with the rear side wall of the outer pipe, the rear side of the arc plate is a vertical plane, a sealing plate is fixedly connected to the rear side of the arc plate by a plurality of screws, a rigid plate parallel to the sealing surface of the sealing plate is nested in the sealing plate, two rows of welded column holes spaced up and down are opened on the rear side wall of the inner pipe, two rows of circular holes spaced up and down are opened on the rear side wall of the outer pipe, and the arc plate, the sealing plate and the rigid plate are all opened There are two rows of flow holes spaced apart from each other. The spatial arrangement of the welded column holes, circular holes and flow holes is consistent with the spatial arrangement of the heat exchange tubes on the condenser tube plate. Each welded column hole, each circular hole and each flow hole is arranged in a front-to-back correspondence. A high-pressure rotating nozzle connected to the high-pressure water flow space is threadedly installed in each welded column hole. The rear end of the high-pressure rotating nozzle passes backward through the corresponding circular hole and is located in the corresponding flow hole. The outer diameter of the high-pressure rotating nozzle is smaller than the aperture of the circular hole to facilitate the low-pressure water to flow out and enter the heat exchange tube.

3. The nested through-flow cleaning head according to claim 2, characterized in that: Several connecting seats are welded on the front wall of the outer pipe, which are spaced apart on the left and right and fixedly connected to the front and rear moving mechanism. The upper parts of the two connecting seats located in the middle and symmetrical on the left and right are fixedly installed with underwater high-definition explosion-proof cameras that are located above the outer pipe and shoot toward the condenser tube plate. Two sights that are spaced apart on the left and right are fixedly installed on the upper side of the arc plate. The two sights are respectively arranged directly behind the two underwater high-definition explosion-proof cameras, and the crosshairs of the sights correspond to the front and back of the center of a corresponding heat exchange tube on the condenser tube plate.

4. The nested through-flow cleaning head according to claim 3, characterized in that: The sealing plate is made of silicone rubber or fluororubber.

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