Continuous drainage water recovery system

Abstract

The continuous drainage recovery system comprises a continuous drainage recovery device, a steam leading-in pipe, a steam leading-out pipe and a continuous drainage leading-in pipe, the continuous drainage recovery device comprises a shell, a steam inlet chamber and a filtering chamber are arranged in the shell, access holes are formed in the positions, corresponding to the steam inlet chamber and the filtering chamber, of the side wall of the shell, and access covers are arranged on the access holes; the access cover comprises a covering plate, a supporting cover plate and a screwing handle, the covering plate comprises an inner bowl side and an outer bowl side, after installation, the inner bowl side is attached to the inner side of the shell, the edge of the outer bowl side abuts against the inner side of the supporting cover plate, the supporting cover plate completely covers the access opening and the installation opening, and the threaded rod penetrates through the supporting cover plate to be matched with the screwing handle; the pressure in the shell acts on the covering plate, so that the inner bowl side is attached to the shell more tightly, the installation reliability of the access hole is enhanced, meanwhile, due to the fact that the outer bowl side and the inner bowl side are arranged oppositely, the mutual supporting force between the outer bowl side and the supporting cover plate is enhanced, and the whole access cover and the pressure in the shell are more easily balanced.

Description

Technical Field

[0001] The utility model relates to the field of boiler waste water recovery, in particular to a boiler waste water recovery system. Background Art

[0002] Boiler blowdown is a major loss in boiler operation. In order to control the quality of boiler water and steam, two parts of boiler wastewater must be discharged. The first part is continuous blowdown, also known as surface blowdown, which requires continuous discharge of part of the boiler water from the part with the highest salt and alkali concentration to reduce the salt content, alkali content, silica content and suspended slag content in the boiler water. The second part is periodic blowdown, also known as bottom blowdown, which needs to be discharged from the bottom of the boiler regularly.

[0003] The purpose of sewage discharge is to protect the quality of boiler water so that the boiler can operate safely and stably for a long time. However, directly discharging continuous sewage and fixed sewage will not only lose heat and affect the efficiency of the boiler, but also cause thermal pollution to the environment.

[0004] Existing devices for recycling continuous drainage generally have an inspection port on one side or one end of the device, which is used to inspect or replace internal parts from the inspection port when the device is shut down for inspection. The inspection port is usually simply connected to the inspection cover through a flange, and the connection is only based on the threads on the flange. However, when the device is running, the internal pressure is usually several to dozens of times higher than the atmospheric pressure, and a single threaded connection is prone to fatigue loosening. Utility Model Content

[0005] In view of the above problems, the utility model proposes a continuous drainage recovery system.

[0006] The technical solution adopted by the utility model is as follows:

[0007] A continuous drainage recovery system, comprising a continuous drainage recovery device, a steam inlet pipe, a steam outlet pipe and a continuous drainage inlet pipe, the continuous drainage recovery device comprising a shell, the shell comprising a steam inlet chamber and a filter chamber, the filter chamber being provided with a filter assembly, the shell side walls corresponding to the steam inlet chamber and the filter chamber being provided with inspection ports, the inspection ports being provided with an inspection cover, the inspection cover comprising a covering plate, a supporting cover plate and a tightening handle, the inspection port being circular, and having fan-shaped mounting ports concentric with the inspection port on both sides, the diameter of the mounting port being larger than the diameter of the covering plate and smaller than the diameter of the supporting cover plate; the covering plate being an integrated double bowl-shaped structure connected at the back, comprising an inner bowl side and an outer bowl side, the diameter of the inner bowl side being larger than the diameter of the inspection port and smaller than the diameter of the mounting port, the outer bowl side being provided with an integrated threaded rod; the supporting cover plate being used to be supported outside the shell and completely covering the inspection port and the mounting port, the supporting cover plate being further provided with a connecting port for the threaded rod to pass through, and the tightening handle being provided with a threaded hole for matching with the threaded rod.

[0008] In one embodiment of the utility model, the support cover plate includes an integrated annular support portion and a circular support portion, the annular support portion is vertically arranged along the edge of the circular support portion, and one end of the annular support portion away from the circular support portion is in contact with the shell surface; the connecting hole is arranged on the circular support portion.

[0009] In one embodiment of the utility model, a connecting portion is further provided on the shell, and the connecting portion is annularly arranged along the edges of the inspection port and the installation port, and the outer arc surface of the connecting portion is provided with an external thread; the annular supporting portion of the supporting cover plate is provided with an internal thread for threaded connection with the connecting portion.

[0010] In one embodiment of the present invention, the curvature of the inner bowl side of the cover plate is consistent with the inner wall of the shell.

[0011] In one embodiment of the present invention, an arc-shaped positioning strip is further provided on the inner bowl side of the cover plate for cooperating with the edge of the inspection opening for positioning.

[0012] In one embodiment of the present invention, the external thread of the connecting portion is opposite to the thread direction of the threaded rod disposed on the outer bowl side.

[0013] In one embodiment of the present invention, at least one contact switch is further provided on the inner side of the circular support portion of the support cover plate, and the contact switch is used to connect to a DCS control system in a power plant.

[0014] The beneficial effects of the utility model are as follows: the covering plate of the inspection cover is a double-bowl-shaped structure facing back to back, and the shape of the inspection port and the fan-shaped installation port is matched so that the covering plate can be installed after adjusting the angle, and after installation, the inner bowl side fits against the inner side of the shell, and the edge of the outer bowl side rests on the inner side of the support cover plate, and the support cover plate completely covers the inspection port and the installation port, and the threaded rod passes through the connecting port and is tightened with the tightening handle, so that the covering plate, the support cover plate and the shell form a detachable fixed connection; when the device is working, the pressure inside the shell acts on the covering plate, so that the inner bowl side fits more closely with the shell, thereby utilizing the pressure inside the shell to enhance the installation reliability of the inspection port, and at the same time, because the outer bowl side and the inner bowl side are arranged back to back, the mutual supporting force between the outer bowl side and the support cover plate is enhanced, so that the inspection cover as a whole and the pressure inside the shell are easier to achieve balance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the drainage recovery system of this embodiment;

[0016] Figure 2 Schematic diagram of the connection between the inner wall of the housing and the inspection cover of this embodiment;

[0017] Figure 3 is a schematic diagram of the inspection cover of this embodiment;

[0018] Figure 4 is a schematic diagram of the access cover;

[0019] Figure 5 yes Figure 4 Right view of;

[0020] The reference numerals in the figures are:

[0021] 1. Shell, 2. Inspection port, 3. Inspection cover, 31. Cover plate, 311. Inner bowl side, 312. Outer bowl side, 313. Threaded rod, 314. Arc-shaped positioning strip, 32. Support cover plate, 321. Connection port, 322. Annular support portion, 323. Circular support portion, 33. Tightening handle, 4. Installation port, 5. Connection portion, 6. Contact switch, 7. Continuous recovery device, 8. Steam inlet pipe, 9. Steam outlet pipe, 10. Continuous water inlet pipe, 11. Steam main pipe. DETAILED DESCRIPTION

[0022] The utility model is described in detail below in conjunction with the accompanying drawings.

[0023] Example

[0024] like Figure 1-5 As shown, a continuous drainage recovery system includes a continuous drainage recovery device 7, a steam inlet pipe 8, a steam outlet pipe 9 and a continuous drainage inlet pipe 10.

[0025] One end of the steam inlet pipe 8 is used to introduce the original high-temperature heat source steam in the plant, and the other end is connected to the continuous recovery device, and the high-temperature heat source steam is introduced from the steam main pipe 11 into the continuous recovery device 7. One end of the continuous drainage inlet pipe 10 is used to introduce the boiler continuous drainage, and the other end is connected to the steam inlet pipe 8, so that the continuous drainage is introduced into the steam inlet pipe 8 after coming out of the boiler drum and mixed with the high-temperature heat source steam. After the high-temperature heat source steam enthalpy is compensated, it is completely vaporized, and the impurities originally dissolved in the continuous drainage are free in the steam to form mixed steam, and enter the continuous recovery device 7 together. One end of the steam outlet pipe 9 is connected to the continuous recovery device 7, and is used to lead out the clean steam after filtration. The other end is connected to the main pipe of the original high-temperature heat source steam in the plant, and the clean steam is led back to the steam main pipe 11.

[0026] In this embodiment, two continuous recovery devices 7 are included and are arranged in parallel with each other, so that one is used for backup and the other is used in the factory. Corresponding valves are installed on the steam main pipe 11, the steam inlet pipe 8, the steam outlet pipe 9 and the continuous water inlet pipe 10, respectively, and switching can be achieved by controlling the opening and closing of the valves. In other embodiments, more than two can also be arranged in parallel.

[0027] The continuous recovery device 7 comprises a housing 1, which contains a steam inlet chamber and a filter chamber. A filter assembly is arranged in the filter chamber, and an inspection port 2 is arranged on the side wall of the housing 1 corresponding to the steam inlet chamber and the filter chamber, so that the steam inlet chamber and the filter chamber can be inspected separately.

[0028] An inspection cover 3 is provided on the inspection opening 2 , and the inspection cover 3 includes a covering plate 31 , a supporting cover plate 32 and a tightening handle 33 .

[0029] The inspection opening 2 is circular, and has fan-shaped installation openings 4 concentric with the inspection opening 2 on both sides. The diameter of the installation opening 4 is larger than the diameter of the cover plate 31 and smaller than the diameter of the support cover plate 32 .

[0030] The cover plate 31 is an integrated double bowl-shaped structure connected at the back, including an inner bowl side 311 and an outer bowl side 312. The diameter of the inner bowl side 311 is larger than the diameter of the inspection port 2 and smaller than the diameter of the installation port 4, and the outer bowl side 312 is provided with an integrated threaded rod 313.

[0031] The support cover plate 32 is used to be supported outside the housing 1 and completely cover the inspection port 2 and the installation port 4. The support cover plate 32 is also provided with a connection port 321 for the threaded rod 313 to pass through. The tightening handle 33 is provided with a threaded hole for matching with the threaded rod 313.

[0032] The cover plate 31 of the inspection cover 3 is a double bowl-shaped structure facing back to back. The shape of the inspection port 2 and the fan-shaped installation port 4 is matched so that the cover plate 31 can be installed after adjusting the angle. After installation, the inner bowl side 311 fits the inner side of the shell 1, and the edge of the outer bowl side 312 is against the inner side of the support cover plate 32. The support cover plate 32 completely covers the inspection port 2 and the installation port 4. The threaded rod 313 passes through the connection port 321 and is tightened with the tightening handle 33, so that the cover plate 31, the support cover plate 32 and the shell 1 form a detachable fixed connection. The curvature of the inner bowl side 311 of the cover plate 31 is consistent with the inner wall of the shell 1.

[0033] When the device is working, the pressure inside the shell 1 acts on the covering plate 31, making the inner bowl side 311 fit more closely with the shell 1, thereby utilizing the internal pressure of the shell 1 to enhance the installation reliability of the inspection port 2. At the same time, since the outer bowl side 312 and the inner bowl side 311 are arranged back to back, the mutual supporting force between the outer bowl side 312 and the supporting cover plate 32 is enhanced, making it easier for the inspection cover 3 as a whole to achieve balance with the internal pressure of the shell 1.

[0034] The support cover plate 32 includes an integrated annular support portion 322 and a circular support portion 323. The annular support portion 322 is vertically arranged along the edge of the circular support portion 323, and one end of the annular support portion 322 away from the circular support portion 323 is in contact with the surface of the shell 1. The connecting hole is arranged on the circular support portion 323. After installation, the top end of the annular support portion 322 is in contact with the surface of the shell 1, and the inspection port 2 and the installation port 4 are completely covered to form a cavity. The outer bowl side 312 of the covering plate 31 is against the inner surface of the circular support portion 323, and interacts with the circular support portion 323.

[0035] The shell 1 is also provided with a connecting portion 5, which is annularly arranged along the edges of the inspection port 2 and the installation port 4, and has an outer arc surface with an external thread. The annular supporting portion 322 of the supporting cover plate 32 is provided with an internal thread for threaded connection with the connecting portion 5.

[0036] The external thread of the connection portion 5 is opposite to the thread direction of the threaded rod 313 provided on the outer bowl side 312, so that the direct connection between the support cover plate 32 and the housing 1 is more reliable and less likely to loosen.

[0037] The inner bowl side 311 of the cover plate 31 is also provided with an arc-shaped positioning strip 314, which is used to cooperate with the edge of the inspection port 2 for positioning. During installation, the cover plate 31 is aligned with the installation port 4, and the inner bowl side 311 of the cover plate 31 is installed into the inspection port 2 after adjusting the angle by tilting the cover plate 31, and the arc-shaped positioning strip 314 is stuck on the installation port 4 to assist in positioning the cover plate 31. Then the threaded rod 313 on the outer bowl side 312 is passed through the connecting port 321 on the support cover plate 32, and the support cover plate 32 is screwed together with the connecting part 5 on the shell 1, and finally the tightening handle 33 is connected to the threaded rod 313, so that the support cover plate 32 is firmly fixed on the shell 1. The installed support cover plate 32 can completely cover the inspection port 2 and the installation port 4, thereby forming a closed space with the inside of the shell 1.

[0038] At least one contact switch 6 is also provided inside the circular support portion 323 of the support cover 32. The contact switch 6 is used to connect to the DCS control system in the power plant. After installation, the contact switch 6 contacts the top of the connection portion 5 on the housing 1 and transmits the signal to the DCS control system in the power plant. This is a normal installation working state. When the support cover 32 becomes loose, the contact switch 6 separates from the top of the connection portion 5, the signal is interrupted, and the DCS control system issues an alarm prompt, so that it can be discovered in time.

[0039] The above description is only a preferred embodiment of the utility model, and does not limit the patent protection scope of the utility model. Any equivalent structural transformation made using the contents of the utility model specification and drawings, directly or indirectly used in other related technical fields, is also included in the protection scope of the utility model.

Claims

1. A continuous drainage recovery system, comprising a continuous drainage recovery device, a steam inlet pipe, a steam outlet pipe and a continuous drainage inlet pipe, wherein the continuous drainage recovery device comprises a shell, wherein the shell contains a steam inlet chamber and a filter chamber, wherein a filter assembly is provided in the filter chamber, wherein: The shell side walls corresponding to the steam inlet chamber and the filter chamber are both provided with inspection openings, and the inspection openings are provided with inspection covers, and the inspection covers include a covering plate, a supporting cover plate and a tightening handle. The inspection opening is circular, and fan-shaped mounting openings concentric with the inspection openings are opened on both sides, and the diameter of the mounting openings is larger than the diameter of the covering plate and smaller than the diameter of the supporting cover plate; the covering plate is an integrated double bowl-shaped structure connected at the back, including an inner bowl side and an outer bowl side, the diameter of the inner bowl side is larger than the diameter of the inspection opening and smaller than the diameter of the mounting opening, and the outer bowl side is provided with an integrated threaded rod; the supporting cover plate is used to be supported outside the shell and completely cover the inspection opening and the mounting opening, and the supporting cover plate is also provided with a connecting port for the threaded rod to pass through, and the tightening handle is provided with a threaded hole for matching with the threaded rod.

2. The continuous drainage recovery system according to claim 1, characterized in that: The curvature of the inner bowl side of the covering plate is consistent with the inner wall of the shell.

3. The continuous drainage recovery system according to claim 2, characterized in that: An arc-shaped positioning strip is also provided on the inner bowl side of the cover plate for cooperating with the edge of the inspection opening for positioning.

4. The continuous drainage recovery system according to claim 3, characterized in that: The support cover plate includes an integrated annular support portion and a circular support portion, wherein the annular support portion is vertically arranged along the edge of the circular support portion, and one end of the annular support portion away from the circular support portion is in contact with the shell surface; the connection port is arranged on the circular support portion.

5. The continuous drainage recovery system according to claim 4, characterized in that: The shell is also provided with a connecting portion, which is annularly arranged along the edges of the inspection port and the installation port, and the outer arc surface of the connecting portion is provided with an external thread; the annular supporting portion of the supporting cover plate is provided with an internal thread for threaded connection with the connecting portion.

6. The continuous drainage recovery system according to claim 5, characterized in that: The external thread of the connecting portion is opposite to the thread direction of the threaded rod arranged on the outer bowl side.

7. The continuous drainage recovery system according to claim 6, characterized in that: At least one contact switch is also provided inside the circular support portion of the support cover plate, and the contact switch is used to connect to a DCS control system in a power plant.

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