Device and method for cleaning rotary air preheater without disassembly

Abstract

The invention relates to a device for cleaning a rotary air preheater without disassembly, which comprises a collecting tank suitable for being detachably arranged below the air preheater, and the upper end of a shell of the collecting tank is used for receiving waste liquid and waste residues generated by cleaning the air preheater; a transfer pump; the sedimentation tank is used for separating waste liquid and waste residues and is provided with a sedimentation tank inlet, a sedimentation tank water outlet and a sedimentation tank residue discharging opening, the sedimentation tank water outlet is used for discharging waste water separated from the waste residues, the sedimentation tank residue discharging opening is formed in the lower portion of the sedimentation tank and used for discharging the waste residues, and the conveying pump is used for conveying the waste liquid and the waste residues from the collecting tank to the sedimentation tank inlet; and the waste residue and mortar conveying unit is communicated with the slag discharge port of the sedimentation tank and is used for conveying waste residues and mortar. The invention further relates to a method for cleaning the rotary air preheater without disassembly.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to the field of boilers, and more particularly to a device for cleaning a rotary air preheater without disassembly and a method for cleaning a rotary air preheater without disassembly. Background Art

[0003] Among the series of derivative problems, air preheater blockage has become a common problem faced by units, especially for units burning lean coal, anthracite and other NO X Air preheater blockage is particularly serious in power plants with high initial emission mass concentration and high sulfur content in coal. Air preheaters are widely installed in coal-fired equipment as heat recovery devices. Coal-fired units heat primary and secondary air by recovering the heat of flue gas after the economizer, reducing the exhaust temperature and improving thermal efficiency. At present, the air preheaters used in units above 300MW in my country generally use rotary air preheaters. When the air preheater is blocked, it will cause problems such as increased smoke and wind resistance, increased pressure difference, increased energy consumption and decreased heat exchange efficiency, which need to be solved in time.

[0004] In response to the blockage, high-pressure water (greater than 10MPa) flushing is an indispensable part of the current air preheater cleaning technology. The use of high-pressure water equipment can flush the equipment without disassembly or disassembly. A large amount of waste liquid and waste residue will inevitably be generated during the cleaning process, affecting the on-site environment and safety. At the same time, it cannot meet the discharge requirements of solid waste and waste liquid. It is necessary to design and develop a waste liquid and waste residue treatment device and method, which can meet the discharge standards after collection and treatment. Summary of the invention

[0005] The present invention is proposed to solve or alleviate at least one aspect of the problems in the prior art.

[0006] An embodiment of the present invention relates to a device for cleaning a rotary air preheater without disassembly, comprising:

[0007] A collecting tank, adapted to be detachably arranged below the air preheater, wherein the upper end of the housing of the collecting tank receives waste liquid and waste residue generated by cleaning the air preheater;

[0008] Delivery pump;

[0009] A sedimentation tank for separating waste liquid and waste residue, provided with a sedimentation tank inlet, a sedimentation tank outlet, and a sedimentation tank slag outlet, wherein the sedimentation tank outlet is used to discharge waste water separated from the waste residue, the sedimentation tank slag outlet is provided at the lower part of the sedimentation tank for discharging the waste residue, and the delivery pump is used to deliver the waste liquid and waste residue from the collection tank to the sedimentation tank inlet;

[0010] The waste slag slurry conveying unit is communicated with the slag discharge port of the sedimentation tank and is used for conveying waste slag and slurry.

[0011] According to another aspect of an embodiment of the present invention, a device for cleaning a rotary air preheater without disassembly is provided, comprising:

[0012] A collecting tank, adapted to be detachably arranged below the air preheater, the collecting tank being used to receive waste liquid and waste residue generated by cleaning the air preheater;

[0013] A waste liquid and waste residue separation unit, used to separate at least a portion of the collected waste liquid from the waste residue;

[0014] The waste liquid utilization unit enables the water outlet of the collection tank and the water outlet of the sedimentation tank to communicate with the ground flushing pipeline or the dust suppression pipeline of the coal yard / ash yard;

[0015] The waste slag conveying unit is used to convey the separated waste slag.

[0016] According to another aspect of an embodiment of the present invention, a method for cleaning a rotary air preheater is provided, comprising the steps of:

[0017] A collecting tank is detachably arranged below the air preheater, and the upper end of the shell of the collecting tank is open to receive the waste liquid and waste residue generated by cleaning the air preheater;

[0018] A delivery pump is provided, wherein the inlet of the delivery pump is communicated with the collecting tank;

[0019] A sedimentation tank is provided for separating waste liquid and waste residue, and the sedimentation tank is provided with a sedimentation tank inlet, a sedimentation tank outlet, and a sedimentation tank slag discharge port;

[0020] The waste liquid and waste residue generated by the flushing air preheater are collected in a collecting tank, and the waste liquid from the collecting tank is transported to the inlet of the sedimentation tank by a delivery pump;

[0021] The waste residue and waste water are separated in the sedimentation tank, the separated waste water flows out from the sedimentation tank outlet, and the collected waste residue is discharged from the sedimentation tank outlet;

[0022] Collect and transport waste slag from the sewage outlet of the collection tank and the slag outlet of the sedimentation tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the composition of a device for cleaning a rotary air preheater without disassembly according to an exemplary embodiment of the present invention;

[0024] Figure 2 A schematic diagram of the structure of a collecting tank according to an exemplary embodiment of the present invention;

[0025] Figure 3 A schematic diagram of the structure of a sedimentation tank according to an exemplary embodiment of the present invention;

[0026] Figure 4 Schematic diagram of the structure of a collecting tank according to an embodiment of the present invention.

[0027] In the figure: 1. Collection tank shell; 1a steel pipe; 1b: plastic sheet or waterproof cloth; 2. Collection tank outlet; 3. Collection tank drain outlet; 4. Sedimentation tank shell; 5. Sedimentation tank waste water inlet; 6. Sedimentation tank rectifier plate; 7. Inclined plate or inclined pipe; 8. Water collecting trough; 9. Sedimentation tank outlet; 10. Sedimentation tank waste slurry discharge outlet. DETAILED DESCRIPTION

[0028] The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the overall inventive concept of the present invention and should not be construed as limiting the present invention.

[0029] The present invention aims to provide a device and method, which can collect and separate waste liquid and waste residue generated when a rotary air preheater is not disassembled for cleaning, so as to achieve effective treatment or discharge in accordance with relevant standards.

[0030] More specifically, the present invention aims at the characteristics and problems of waste liquid and waste residue generated when the rotary air preheater is not disassembled for cleaning, and the technical solution adopted is: including collection, separation and disposal, the waste residue water generated when the air preheater is not disassembled for cleaning is collected, the waste liquid and waste residue are separated by a separation device, and the separated waste liquid and waste residue are then disposed of and placed separately.

[0031] like Figure 1 As shown, the present invention proposes a device for cleaning a rotary air preheater without disassembly, comprising a collecting tank or a water receiving tank, a sedimentation tank and a delivery pump.

[0032] See also Figure 1 The present invention proposes a method for collecting and treating waste liquid and waste residue when a rotary air preheater is not disassembled for cleaning. The waste liquid and waste residue are collected and separated through a collecting tank and a sedimentation tank. The waste residue water is transported through a delivery pump. The waste residue slurry at the bottom of the collecting tank is finally placed together with the waste residue slurry at the bottom of the sedimentation tank.

[0033] See also Figure 2 The upper part of the collecting tank shell 1 is cylindrical in design and can be directly placed at the bottom of the rotary air preheater, and the waste water is discharged from the collecting tank outlet 2; a conical sludge hopper is provided at the bottom of the collecting tank, which can collect a small amount of waste sludge and discharge it through the collecting tank outlet 3.

[0034] See also Figure 3 The sedimentation tank is the main waste liquid and waste residue separation device. When cleaning the air preheater, the waste residue water is transported to the waste residue water inlet 5 of the sedimentation tank by the delivery pump, and the waste residue and waste water are separated by gravity sedimentation in the sedimentation tank; Figure 3 As shown, a rectifying plate 6 is provided in the sedimentation tank body, which can play a role in uniform water inflow. Figure 3 As shown, in a further embodiment, an inclined plate or an inclined tube 7 is used to shorten the sedimentation time and improve the sedimentation efficiency.

[0035] like Figure 3 As shown, the separated waste liquid is finally collected by the sump 8; the single inclined design of the bottom of the sedimentation tank collects the waste sludge and is conducive to the collection of the waste sludge to the discharge port, and a sedimentation tank waste sludge discharge port 10 is provided to discharge the waste sludge.

[0036] Based on the characteristics of waste slag and waste liquid, generally, after collection and separation, the waste slag and waste liquid do not need further treatment to meet the relevant emission standards. The waste liquid discharged from the sedimentation tank outlet 9 is used for ground flushing or spraying for dust suppression in the coal yard ash yard, and the waste slag slurry discharged from the waste slag slurry outlets 3 and 10 is sent to the ash yard.

[0037] like Figure 2 As shown, the main body of the collecting tank shell 1 is cylindrical, but in another embodiment of the present invention, when the cross section of the flue is rectangular, the cross section of the main body of the collecting tank shell can also be a rectangle corresponding to the cross section of the flue, such as Figure 4 As shown. The collecting tank shell 1 can be constructed by a steel pipe 1a in the flue, and the inside is enclosed by a plastic sheet or a waterproof sheet 1b to form a receiving space. The collecting tank shell 1 is placed at the bottom of the rotary air preheater. Figure 4 In the figure, a pump for discharging waste water (such as a submersible sewage pump) is not shown, and the pump is used to discharge the collected waste water to the waste water inlet 5 of the sedimentation tank.

[0038] By using this solution, a large amount of waste water containing ash and scale generated by the air preheater without disassembling and cleaning can be effectively separated and treated, meeting the relevant emission requirements for solid waste and waste liquid, and avoiding the waste water generated by the maintenance and cleaning of the rotary air preheater to pollute the on-site environment and affect production and on-site safety.

[0039] Based on the above, the present invention proposes the following technical solutions:

[0040] 1. A device for cleaning a rotary air preheater without disassembling it, comprising:

[0041] A collecting tank, adapted to be detachably arranged below the air preheater, wherein the upper end of the housing of the collecting tank receives waste liquid and waste residue generated by cleaning the air preheater;

[0042] Delivery pump;

[0043] A sedimentation tank for separating waste liquid and waste residue, provided with a sedimentation tank inlet, a sedimentation tank outlet, and a sedimentation tank slag outlet, wherein the sedimentation tank outlet is used to discharge waste water separated from the waste residue, the sedimentation tank slag outlet is provided at the lower part of the sedimentation tank for discharging the waste residue, and the delivery pump is used to deliver the waste liquid and waste residue from the collection tank to the sedimentation tank inlet;

[0044] The waste slag slurry conveying unit is communicated with the slag discharge port of the sedimentation tank and is used for conveying waste slag and slurry.

[0045] 2. The device according to item 1, wherein:

[0046] The upper part of the collecting tank is provided with a collecting tank water outlet, and the lower part of the collecting tank is provided with a collecting tank sewage outlet;

[0047] The inlet of the delivery pump is communicated with the water outlet of the collection tank, and the outlet of the delivery pump is communicated with the inlet of the sedimentation tank;

[0048] The waste slag slurry conveying unit is communicated with the sewage outlet of the collecting tank and the slag outlet of the sedimentation tank, and is used for conveying waste slag and slurry.

[0049] 3. The device according to 2, wherein:

[0050] The upper end of the shell of the collecting tank is a circular opening; or

[0051] The cross section of the main body of the shell of the collecting tank is a rectangle corresponding to the cross section shape of the flue where the air preheater is located.

[0052] 4. The device according to 3, wherein:

[0053] A conical bucket is provided at the bottom of the collecting tank for collecting waste residue and sludge, and a sewage outlet of the collecting tank is arranged at the bottom of the conical bucket.

[0054] 5. The device according to item 1, wherein:

[0055] The sedimentation tank is provided with a rectifying plate for making the fluid from the sedimentation tank inlet enter the sedimentation tank uniformly; and / or

[0056] The sedimentation tank is provided with inclined plates or inclined tubes to improve sedimentation efficiency.

[0057] 6. The device according to 5, wherein:

[0058] The sedimentation tank is provided with a sedimentation tank and a water collection tank, and the rectifying plate and / or the inclined plate or inclined tube are located in the sedimentation tank to facilitate sedimentation separation;

[0059] The water collection tank is separated from the sedimentation tank by a separation wall, and the wastewater in the sedimentation tank is suitable for going over the separation wall and entering the water collection tank. The water outlet of the sedimentation tank is arranged at the lower part or bottom of the water collection tank.

[0060] 7. The device according to 6, wherein:

[0061] The bottom of the sedimentation tank is a single inclined design structure, which is conducive to the waste slag slurry to be collected toward the slag discharge port of the sedimentation tank.

[0062] 8. The device according to any one of 1 to 7, wherein:

[0063] The water outlet of the collection tank and the water outlet of the sedimentation tank are connected to the ground flushing pipeline or the dust suppression pipeline of the coal yard / ash yard.

[0064] 9. A device for cleaning a rotary air preheater without disassembly, comprising:

[0065] A collecting tank, adapted to be detachably arranged below the air preheater, the collecting tank being used to receive waste liquid and waste residue generated by cleaning the air preheater;

[0066] A waste liquid and waste residue separation unit, used to separate at least a portion of the collected waste liquid from the waste residue;

[0067] The waste liquid utilization unit enables the water outlet of the collection tank and the water outlet of the sedimentation tank to communicate with the ground flushing pipeline or the dust suppression pipeline of the coal yard / ash yard;

[0068] The waste slag conveying unit is used to convey the separated waste slag.

[0069] 10. The device according to 9, wherein:

[0070] The waste liquid and waste residue separation unit includes a primary separation part and a secondary separation part;

[0071] The primary separation part includes the collecting tank, the upper part of the collecting tank is provided with a collecting tank water outlet, the lower part of the collecting tank is provided with a collecting tank sewage outlet, and a part of the waste residue is discharged from the collecting tank sewage outlet;

[0072] The secondary separation part includes a sedimentation tank for separating waste liquid and waste residue. The sedimentation tank is provided with a sedimentation tank inlet, a sedimentation tank outlet, and a sedimentation tank slag discharge port. The sedimentation tank outlet is used to discharge the waste water separated from the waste residue. The sedimentation tank slag discharge port is arranged at the lower part of the sedimentation tank for discharging the waste residue. The collection tank outlet is communicated with the sedimentation tank inlet via a delivery pump.

[0073] The waste slag conveying unit is communicated with the sewage outlet of the collecting tank and the slag outlet of the sedimentation tank to convey the collected waste slag.

[0074] 11. A method for cleaning a rotary air preheater, comprising the steps of:

[0075] A collecting tank is detachably arranged below the air preheater, and the upper end of the shell of the collecting tank is open to receive the waste liquid and waste residue generated by cleaning the air preheater;

[0076] A delivery pump is provided, wherein the inlet of the delivery pump is communicated with the collecting tank;

[0077] A sedimentation tank is provided for separating waste liquid and waste residue, and the sedimentation tank is provided with a sedimentation tank inlet, a sedimentation tank outlet, and a sedimentation tank slag discharge port;

[0078] The waste liquid and waste residue generated by the flushing air preheater are collected in a collecting tank, and the waste liquid from the collecting tank is transported to the inlet of the sedimentation tank by a delivery pump;

[0079] The waste residue and waste water are separated in the sedimentation tank, the separated waste water flows out from the sedimentation tank outlet, and the collected waste residue is discharged from the sedimentation tank outlet;

[0080] Collect and transport waste slag from the sewage outlet of the collection tank and the slag outlet of the sedimentation tank.

[0081] 12. The method according to 11, wherein:

[0082] The rotary air preheater is cleaned using the device for cleaning the rotary air preheater according to any one of 1 to 10.

[0083] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes may be made to the embodiments and combinations of elements may be made without departing from the principles and spirit of the invention, the scope of the invention being defined by the appended claims and their equivalents.

Claims

1. A device for cleaning a rotary air preheater without disassembly, comprising: A collecting tank, adapted to be detachably arranged below the air preheater, wherein the upper end of the housing of the collecting tank receives waste liquid and waste residue generated by cleaning the air preheater; Delivery pump; A sedimentation tank for separating waste liquid and waste residue, provided with a sedimentation tank inlet, a sedimentation tank outlet, and a sedimentation tank slag outlet, wherein the sedimentation tank outlet is used to discharge waste water separated from the waste residue, the sedimentation tank slag outlet is provided at the lower part of the sedimentation tank for discharging the waste residue, and the delivery pump is used to deliver the waste liquid and waste residue from the collection tank to the sedimentation tank inlet; The waste slag slurry conveying unit is communicated with the slag discharge port of the sedimentation tank and is used for conveying waste slag and slurry.

2. The device according to claim 1, wherein: The upper part of the collecting tank is provided with a collecting tank water outlet, and the lower part of the collecting tank is provided with a collecting tank sewage outlet; The inlet of the delivery pump is communicated with the water outlet of the collection tank, and the outlet of the delivery pump is communicated with the inlet of the sedimentation tank; The waste slag slurry conveying unit is communicated with the sewage outlet of the collecting tank and the slag outlet of the sedimentation tank, and is used for conveying waste slag and slurry.

3. The device according to claim 2, wherein: The upper end of the shell of the collecting tank is a circular opening; or The cross section of the main body of the shell of the collecting tank is a rectangle corresponding to the cross section shape of the flue where the air preheater is located.

4. The device according to claim 3, wherein: A conical bucket is provided at the bottom of the collecting tank for collecting waste residue and sludge, and a sewage outlet of the collecting tank is arranged at the bottom of the conical bucket.

5. The device according to claim 1, wherein: The sedimentation tank is provided with a rectifying plate for making the fluid from the sedimentation tank inlet enter the sedimentation tank uniformly; and / or The sedimentation tank is provided with inclined plates or inclined tubes to improve sedimentation efficiency.

6. The device according to claim 5, wherein: The sedimentation tank is provided with a sedimentation tank and a water collection tank, and the rectifying plate and / or the inclined plate or inclined tube are located in the sedimentation tank to facilitate sedimentation separation; The water collection tank is separated from the sedimentation tank by a separation wall, and the wastewater in the sedimentation tank is suitable for going over the separation wall and entering the water collection tank. The water outlet of the sedimentation tank is arranged at the lower part or bottom of the water collection tank.

7. The device according to claim 6, wherein: The bottom of the sedimentation tank is a single inclined design structure, which is conducive to the waste slag slurry to be collected toward the slag discharge port of the sedimentation tank.

8. The device according to any one of claims 1 to 7, wherein: The water outlet of the collection tank and the water outlet of the sedimentation tank are connected to the ground flushing pipeline or the dust suppression pipeline of the coal yard / ash yard.

9. A device for cleaning a rotary air preheater without disassembly, comprising: A collecting tank, adapted to be detachably arranged below the air preheater, the collecting tank being used to receive waste liquid and waste residue generated by cleaning the air preheater; A waste liquid and waste residue separation unit, used to separate at least a portion of the collected waste liquid from the waste residue; The waste liquid utilization unit enables the water outlet of the collection tank and the water outlet of the sedimentation tank to communicate with the ground flushing pipeline or the dust suppression pipeline of the coal yard / ash yard; The waste slag conveying unit is used to convey the separated waste slag.

10. The device according to claim 9, wherein: The waste liquid and waste residue separation unit includes a primary separation part and a secondary separation part; The primary separation part includes the collecting tank, the upper part of the collecting tank is provided with a collecting tank water outlet, the lower part of the collecting tank is provided with a collecting tank sewage outlet, and a part of the waste residue is discharged from the collecting tank sewage outlet; The secondary separation part includes a sedimentation tank for separating waste liquid and waste residue. The sedimentation tank is provided with a sedimentation tank inlet, a sedimentation tank outlet, and a sedimentation tank slag discharge port. The sedimentation tank outlet is used to discharge the waste water separated from the waste residue. The sedimentation tank slag discharge port is arranged at the lower part of the sedimentation tank for discharging the waste residue. The collection tank outlet is communicated with the sedimentation tank inlet via a delivery pump. The waste slag conveying unit is communicated with the sewage outlet of the collecting tank and the slag outlet of the sedimentation tank to convey the collected waste slag.

11. A method for cleaning a rotary air preheater, comprising the steps of: A collecting tank is detachably arranged below the air preheater, and the upper end of the shell of the collecting tank is open to receive the waste liquid and waste residue generated by cleaning the air preheater; A delivery pump is provided, wherein the inlet of the delivery pump is communicated with the collecting tank; A sedimentation tank is provided for separating waste liquid and waste residue, and the sedimentation tank is provided with a sedimentation tank inlet, a sedimentation tank outlet, and a sedimentation tank slag discharge port; The waste liquid and waste residue generated by the flushing air preheater are collected in a collecting tank, and the waste liquid from the collecting tank is transported to the inlet of the sedimentation tank by a delivery pump; The waste residue and waste water are separated in the sedimentation tank, the separated waste water flows out from the sedimentation tank outlet, and the collected waste residue is discharged from the sedimentation tank outlet; Collect and transport waste slag from the sewage outlet of the collection tank and the slag outlet of the sedimentation tank.

12. The method according to claim 11, wherein: The rotary air preheater is cleaned using the device for cleaning the rotary air preheater according to any one of claims 1 to 10.

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