CN112129160A - Online circulation cleaning device of heat exchanger - Google Patents
Online circulation cleaning device of heat exchanger Download PDFInfo
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- CN112129160A CN112129160A CN201910546647.7A CN201910546647A CN112129160A CN 112129160 A CN112129160 A CN 112129160A CN 201910546647 A CN201910546647 A CN 201910546647A CN 112129160 A CN112129160 A CN 112129160A
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- cleaning
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- oil cylinder
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
- F23J3/02—Cleaning furnace tubes; Cleaning flues or chimneys
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G15/00—Details
- F28G15/003—Control arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G15/00—Details
- F28G15/08—Locating position of cleaning appliances within conduits
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- Combustion & Propulsion (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
The invention relates to an on-line circulation cleaning device of a heat exchanger, which comprises a booster fan, a hydraulic control system, valves A1, A2, B1 and B2, a gas pressurization pipeline, an upper cleaning oil cylinder, an upper cleaning pipeline, a support bracket, an upper cleaning cover, a lower cleaning oil cylinder, a lower cleaning pipeline, a lower cleaning cover and the like, wherein the upper cleaning oil cylinder and the lower cleaning oil cylinder are respectively provided with position detection signal equipment, the extension length of the upper cleaning oil cylinder and the lower cleaning oil cylinder is accurately controlled by the hydraulic control system, so that the upper cleaning cover and the lower cleaning cover can be synchronously and accurately positioned around a gas heat exchanger (GGH), the upper cleaning pipeline and the lower cleaning pipeline are of an extension structure and used for connecting the cleaning cover and the gas pressurization pipeline, the cleaning cover is driven to move by the oil cylinders, high-pressure gas or cleaned gas is supplied to the cleaning cover, the valves A1, A2, B1 and B2 are arranged, the flow direction of high-pressure gas in the pipeline is changed by switching on and off, so that the switching of the gas injection and suction processes of the upper cleaning cover and the lower cleaning cover is realized.
Description
Technical Field
The invention relates to a cleaning device, in particular to an online circulating cleaning device for a heat exchanger, and belongs to the technical field of electrical equipment control.
Background
The Gas heat exchanger GGH (Gas heater) is one of the main devices in a chemical flue Gas desulfurization and denitrification system, and has the functions of heating the desulfurized flue Gas to be purified by using the heat of the purified flue Gas, so that the temperature of the flue Gas to be purified entering a desulfurization and denitration reaction furnace is above the dew point, the corrosion to an inlet flue and a chimney is reduced, the diffusion degree of pollutants is reduced, the temperature of the flue Gas entering an absorption tower is reduced, and the technical requirement on corrosion prevention in the tower is lowered.
At present, a gas-gas heat exchanger GGH in a desulfurization and denitration reaction furnace widely used in coking enterprises is of a rotary structure, and in actual use, along with the increase of service time, a heat exchange grid on the GGH is blocked due to dust deposition, so that not only is the heat exchange efficiency reduced, but also the gas pressure difference of the upper side and the lower side of the GGH is gradually increased, the pressure drop of a GGH body to the gas is about 1000Pa, and if the pressure drop of a flue caused by installation of the GGH is considered, the total pressure loss reaches about 1200 Pa. In order to overcome the resistance, the air pressure of the booster fan must be increased, but the fan stall and surge can be caused, and the effectiveness and the safety of the operation of the whole desulfurization and denitration flue gas purification system are seriously influenced.
In the prior art, a fully-telescopic soot blower is used for blowing and cleaning soot from the upper side and the lower side of a GGH (gas-gas heater) to a heat exchange grid by using high-pressure nitrogen respectively. In practical use, however, the temperature of the supplemented gas is low, the temperature of the original flue gas can be reduced, heat energy loss is caused, and the swept pollutants can circularly enter the hot end of the GGH due to the fact that the sweeping can only be carried out at the cold end of the GGH each time, so that the sweeping effect is reduced. Therefore, a new technical solution is urgently needed to solve the technical problems.
Disclosure of Invention
The invention provides an on-line circulating cleaning device for a heat exchanger, aiming at the problems in the prior art, and the technical scheme mainly solves the problem that the operation effectiveness and the safety of the whole desulfurization and denitrification system are influenced by the rise of the flue gas differential pressure on two sides of a gas heater (GGH) caused by the blockage due to dust deposition in the use process of the GGH.
In order to achieve the above purpose, the technical scheme of the invention is that the heat exchanger on-line circulation cleaning device comprises a booster fan, a hydraulic control system, valves A1, A2, B1 and B2, a gas pressurization pipeline, an upper cleaning oil cylinder, an upper cleaning pipeline, a support bracket, an upper cleaning cover, a lower cleaning oil cylinder, a lower cleaning pipeline, a lower cleaning cover and the like, wherein the upper cleaning oil cylinder and the lower cleaning oil cylinder are respectively provided with a position detection device, the telescopic length of the upper cleaning oil cylinder and the lower cleaning oil cylinder is accurately controlled by the hydraulic control system, so that the upper cleaning cover and the lower cleaning cover can be synchronously and accurately positioned around a flue gas heat exchanger (GGH), the upper cleaning pipeline and the lower cleaning pipeline are of a telescopic structure and are used for connecting the cleaning cover and the gas pressurization pipeline, the cleaning cover and the cleaning oil cylinder are driven to move to supply high-pressure gas or absorb cleaned gas, the valves A1, A2, B1 and B2 are arranged on, the flow direction of high-pressure gas in the pipeline is changed by switching on and off, so that the switching of the gas injection and suction working modes of the upper cleaning cover and the lower cleaning cover is realized. The problem that the operating effectiveness and the safety of the whole denitration system are influenced by the increase of the flue Gas differential pressure at two sides of the GGH caused by the blockage due to the deposition of dust on a heat exchange grid in the use process of a flue Gas heat exchanger GGH (Gas heater) is solved.
As an improvement of the invention, the upper cleaning pipeline and the lower cleaning pipeline are both provided with filter screens. The filter screen of upper and lower pipeline is removable structure, plays the filterable effect of gas that will clean, avoids the dust of sweeping out to get into the reacting furnace once more.
As an improvement of the present invention, the upper cleaning hood and the lower cleaning hood are both configured to be of a hood type.
The upper cleaning cover and the lower cleaning cover respectively comprise a cover body and a gas pipeline, when the cleaning cover is used for high-pressure gas injection cleaning, high-pressure gas is sprayed out of the gas pipeline, and when the cleaning cover is used for suction cleaning, the high-pressure gas which is cleaned through the cover body is collected and sent into the gas pipeline.
As an improvement of the invention, the width of the cover body is consistent with that of the heat exchange grid, and the length of the cover body is arranged along the direction of the rotating tangent of the heat exchange grid, so that high-pressure cleaning gas blown out from the opposite side can be collected to the greatest extent.
A cleaning method of an online circulating cleaning device comprises the following steps:
when the working mode that the upper cleaning cover is used for air injection cleaning and the lower cleaning cover is used for air suction cleaning is adopted, the valves A1 and A2 are opened, the valves B1 and B2 are closed, high-pressure gas generated from the outlet of the fan after the fan is started reaches the upper cleaning cover through the gas pressurization pipeline, the valve A1, the filter screen and the upper cleaning pipeline, the high-pressure gas is sucked into the lower cleaning cover after cleaning the heat exchange grid from top to bottom in the vertical direction of GGH, and then enters the inlet of the fan through the lower cleaning pipeline, the filter screen, the valve A2 and the gas pressurization pipeline, so that the circular cleaning is completed;
when the working mode that the lower cleaning cover is used for air injection cleaning and the upper cleaning cover is used for air suction cleaning is adopted, the valves B1 and B2 are opened, the valves A1 and A2 are closed, high-pressure gas generated from the outlet of the fan after the fan is started reaches the lower cleaning cover through the gas pressurization pipeline, the valve B1, the filter screen and the lower cleaning pipeline, the high-pressure gas is sucked into the upper cleaning cover after the heat exchange grid is cleaned from bottom to top in the vertical direction of GGH, and then enters the inlet of the fan through the upper cleaning pipeline, the filter screen, the valve B2 and the gas pressurization pipeline, so that the circular cleaning is completed, and most of the gas can be sucked back by the circulating pipeline after the high-pressure cleaning gas finishes cleaning on the GGH grid body.
When the cleaning device is in a stop state, the fan stops running, the valves A1, A2, B1 and B2 are in a closed state, the upper cleaning oil cylinder and the lower cleaning oil cylinder are in cleaning original positions, and the upper cleaning cover and the lower cleaning cover are outside the GGH heat exchange grid and are overlapped in the vertical direction.
Because the running speed of the heat exchange grid can change, in order to ensure the effectiveness of cleaning of the on-line circulating cleaning device of the heat exchanger, a cleaning control method is provided, which is characterized by comprising the following steps:
when the cleaning cover is used for cleaning the outermost heat exchange grid, the standard time required for cleaning at the standard rotating speed N is T, and when the rotating speed of the GGH is adjusted to Nn (the rotating speed when the nth heat exchange grid is cleaned), the cleaning time of the heat exchange grid at the position needs to be adjusted to Nn
After the cleaning cover stays for T time at the outermost circle to complete cleaning of the heat insulation grid, the upper cleaning oil cylinder and the lower cleaning oil cylinder respectively synchronously push the upper cleaning cover and the lower cleaning cover to move for a distance D along the axis direction to start cleaning the layer 1 heat exchange grid for the required time
After cleaning is finished, the oil cylinder pushes the cleaning cover to move for a distance D to clean the 2 nd layer of heat exchange grid for the required time
And repeating the steps until the last layer is cleaned, switching the air injection state and the air suction state of the cleaning cover by changing the states of the valves A1, A2, B1 and B2, cleaning the nth layer of heat exchange grating in the cleaning cover, and taking time
After cleaning is finished, the upper cleaning oil cylinder and the lower cleaning oil cylinder respectively synchronously pull the upper cleaning cover and the lower cleaning cover along the axis direction for a distance D to clean the (n-1) th layer of heat exchange grid for the required time
And so on until finishing cleaning the outermost layer;
after the cleaning in one period is finished, the upper cleaning oil cylinder and the lower cleaning oil cylinder respectively place the upper cleaning cover and the lower cleaning cover in the original positions, the operation of the fan is stopped, all the valves are closed, the filter screen is checked and cleaned, and the online cleaning in the next period is prepared.
Compared with the prior art, the invention has the advantages that 1) the technical scheme utilizes the flue gas in the desulfurization and denitration reaction furnace as a cleaning medium, reduces the requirement on external high-pressure gas and reduces the heat loss in the furnace; 2) the upper side and the lower side of the GGH can be cleaned simultaneously by controlling a gas pipeline and a valve, the polluted surface of the heat exchange grid can be sprayed and sucked, and the cleaning effect is improved; 3) the position of the cleaning cover is accurately positioned through the oil cylinder detection device, so that the dead angle is avoided; 4) the cleaned pollutants are blocked by a filter screen of the cleaner, so that the pollutants are prevented from entering the GGH again to cause pollution; 5) the cleaning time and the cleaning position can be automatically calculated according to the process change, and the uniformity and the high efficiency of cleaning are ensured.
Drawings
FIG. 1 is a structural diagram of an on-line cleaning device for a flue gas heat exchanger;
FIG. 2 is a schematic view of the cleaning hood structure (top, side and bottom views);
FIG. 3 is a schematic top jet purge;
FIG. 4 is a schematic lower jet sweep;
wherein: 1-GGH rotor; 2-GGH heat exchange grid; 3-gas pressurization pipeline; 4-filtering with a filter screen; 5-cleaning the oil cylinder at the upper part; 6-cleaning the pipeline at the upper part; 7-a support bracket; 8-upper cleaning cover; 9-cleaning the oil cylinder at the lower part; 10-cleaning the pipeline at the lower part; 11-lower cleaning hood; 12-a cover body; 13-gas line.
The specific implementation mode is as follows:
for the purpose of enhancing an understanding of the present invention, the present embodiment will be described in detail below with reference to the accompanying drawings.
Example 1: referring to fig. 1 to 4, the on-line circulation cleaning device for the heat exchanger comprises a booster fan, a hydraulic control system, valves a1, a2, B1 and B2, a gas boosting pipeline 3, an upper cleaning oil cylinder 5, an upper cleaning pipeline 6, a support bracket 7, an upper cleaning cover 8, a lower cleaning oil cylinder 9, a lower cleaning pipeline 10 and a lower cleaning cover 11.
The upper cleaning oil cylinder 5 and the lower cleaning oil cylinder 9 are both provided with position detection devices, the telescopic length of the upper cleaning oil cylinder and the lower cleaning oil cylinder is accurately controlled by a hydraulic control system, so that an upper cleaning cover 8 and a lower cleaning cover 11 can be synchronously and accurately positioned around a flue gas heat exchanger (GGH), an upper cleaning pipeline 6 and a lower cleaning pipeline 10 are of telescopic structures and are used for connecting the cleaning covers and a gas pressurization pipeline, the cleaning covers are driven to move by the oil cylinders, high-pressure gas is supplied to the cleaning covers or the cleaned gas is absorbed, valves A1, A2, B1 and B2 are installed on the gas pressurization pipeline 3, the flow direction of the high-pressure gas in the pipeline is changed by switching, and the switching of the gas injection and suction working processes of the upper cleaning cover 8 and the lower cleaning.
And the upper cleaning pipeline 6 and the lower cleaning pipeline 10 are both provided with filter screens 4. The filter screen of upper and lower pipeline is removable structure, plays the filterable effect of gas that will clean, avoids the dust of sweeping out to get into the reacting furnace once more.
The upper cleaning hood 8 and the lower cleaning hood 11 are both configured in a hood type structure.
The upper cleaning hood 8 and the lower cleaning hood 11 each include a hood body 12 and a gas pipe 13, and when the cleaning hoods are used for high-pressure gas injection cleaning, high-pressure gas is injected from the gas pipe 13, and when the cleaning hoods are used for suction cleaning, the high-pressure gas which is swept and collected by the hood bodies is sent to the gas pipe.
The width of the cover body 13 is consistent with that of the heat exchange grid, and the length of the cover body is arranged along the rotating tangential direction of the heat exchange grid, so that high-pressure cleaning gas blown out from opposite sides can be collected to the greatest extent.
Example 2: referring to fig. 1 to 4, a sweeping method of an on-line circulation sweeping device, the method comprising:
when the working mode that the upper cleaning cover 8 is used for air injection cleaning and the lower cleaning cover 11 is used for air suction cleaning is adopted, the valves A1 and A2 are opened, the valves B1 and B2 are closed, high-pressure gas generated from the outlet of the fan after the fan is started reaches the upper cleaning cover 8 through the gas pressurization pipeline 3, the valve A1, the filter screen 4 and the upper cleaning pipeline 6, the high-pressure gas is sucked into the lower cleaning cover 11 after cleaning the heat exchange grid from top to bottom in the vertical direction of GGH, and enters the inlet of the fan through the lower cleaning pipeline 10, the filter screen 4, the valve A2 and the gas pressurization pipeline 3, so that circular cleaning is completed;
when the working mode that the lower cleaning cover 11 is used for air injection cleaning and the upper cleaning cover 8 is used for air suction cleaning is adopted, the valves B1 and B2 are opened, the valves A1 and A2 are closed, high-pressure gas generated from the outlet of the fan after the fan is started reaches the lower cleaning cover 11 through the gas pressurizing pipeline 3, the valve B1, the filter screen 4 and the lower cleaning pipeline 10, the high-pressure gas is sucked into the upper cleaning cover 8 after the heat exchange grid is cleaned from bottom to top in the vertical direction of GGH, and enters the inlet of the fan through the upper cleaning pipeline 6, the filter screen 4, the valve B2 and the gas pressurizing pipeline 3, so that the circular cleaning is completed. In order to ensure that most of the gas can be sucked back by the circulating pipeline after the high-pressure scavenging gas finishes the scavenging of the GGH grid body.
When the cleaning device is in a stop state, the fan stops operating, the valves a1, a2, B1 and B2 are in a closed state, the upper cleaning cylinder 5 and the lower cleaning cylinder 9 are in cleaning home positions, and the upper cleaning hood 8 and the lower cleaning hood 11 are outside the GGH heat exchange grid and are vertically overlapped, as shown in fig. 1.
Because the running speed of the heat exchange grid can change, in order to ensure the effectiveness of cleaning of the on-line circulating cleaning device of the heat exchanger, a cleaning control method is provided, and the method comprises the following steps:
when the cleaning cover is used for cleaning the outermost heat exchange grid, the standard time required for cleaning at the standard rotating speed N is T, and when the rotating speed of the GGH is adjusted to Nn (the rotating speed when the nth heat exchange grid is cleaned), the cleaning time of the heat exchange grid at the position needs to be adjusted to Nn
After the cleaning cover stays for T time at the outermost circle to complete cleaning of the heat insulation grid, the upper cleaning oil cylinder and the lower cleaning oil cylinder respectively synchronously push the upper cleaning cover and the lower cleaning cover to move for a distance D along the axis direction to start cleaning the layer 1 heat exchange grid for the required time
After cleaning is finished, the oil cylinder pushes the cleaning cover to move for a distance D to clean the 2 nd layer of heat exchange grid for the required time
And repeating the steps until the last layer is cleaned, switching the air injection state and the air suction state of the cleaning cover by changing the states of the valves A1, A2, B1 and B2, cleaning the nth layer of heat exchange grating in the cleaning cover, and taking time
After cleaning is finished, the upper cleaning oil cylinder and the lower cleaning oil cylinder respectively synchronously pull the upper cleaning cover and the lower cleaning cover along the axis direction for a distance D to clean the (n-1) th layer of heat exchange grid for the required time
And so on until finishing cleaning the outermost layer;
after the cleaning in one period is finished, the upper cleaning oil cylinder and the lower cleaning oil cylinder respectively place the upper cleaning cover and the lower cleaning cover in the original positions, the operation of the fan is stopped, all the valves are closed, the filter screen is checked and cleaned, and the online cleaning in the next period is prepared.
The working principle is as follows: referring to fig. 1, a structural diagram of an on-line circulating heat exchanger cleaning device is shown in fig. 1, a GGH in a flue gas purification reaction furnace is composed of a plurality of circles of GGH heat exchange grids 2 which are in a concentric circle structure, the left side of a rotor is a hot end, the right side of the rotor is a cold end, flue gas to be purified is in a low-temperature state, the flue gas enters the heat exchange grids from the right side of the flue gas purification reaction furnace, the flue gas is changed into high-temperature gas after being purified by chemical reaction in the reaction furnace, the high-temperature gas flows out from the left side of the flue gas purification reaction furnace through the heat exchange grids. The heat exchange grid 2 rotates clockwise (overlook) around the rotor 1, and the hot end heat exchange grid heated by the high-temperature flue gas is clockwise rotated to the cold end to heat the flue gas to be purified, so that the heat exchange process is completed. In order to solve the pollution problem of pollutants to a heat exchange grid and improve the cleaning effectiveness of the GGH heat exchange grid, the device is mainly composed of a booster fan, a hydraulic control system, valves A1, A2, B1 and B2, a gas pressurization pipeline 3, a filter screen 4, an upper cleaning oil cylinder 5, an upper cleaning pipeline 6, a support bracket 7, an upper cleaning cover 8, a lower cleaning oil cylinder 9, a lower cleaning pipeline 10, a lower cleaning cover 11 and the like. In the embodiment, the diameters of the gas booster pipeline and the cleaning pipeline are 15CM, and the wind pressure generated by the booster fan in the pipeline reaches 0.9 MPa. The upper cleaning oil cylinder 5 and the lower cleaning oil cylinder 9 are both provided with position detection devices, and the extension length of the upper cleaning oil cylinder and the lower cleaning oil cylinder is accurately controlled by a hydraulic control system, so that the upper cleaning cover 8 and the lower cleaning cover 11 can be synchronously and accurately positioned in the GGH. The upper cleaning pipeline 6 and the lower cleaning pipeline 10 are of telescopic structures and are used for connecting the cleaning cover and the gas pressurization pipeline, the cleaning cover and the gas pressurization pipeline are driven by the oil cylinder to move, and high-pressure gas is supplied to the cleaning cover or the cleaned gas is absorbed. Valves a1, a2, B1 and B2 are installed on the gas pressurizing line 3, and in this example, valves a1 and a2 are opened and valves B1 and B2 are closed when the upper cleaning hood 8 is used for gas injection cleaning and the lower cleaning hood 11 is used for suction cleaning. When the lower cleaning hood 11 is used for air-jet cleaning and the upper cleaning hood 8 is used for air-suction cleaning, the valves B1 and B2 are opened and the valves a1 and a2 are closed. Referring to fig. 2, an upper cleaning hood 8 and a lower cleaning hood 11 are designed and manufactured such that when the cleaning hoods are used for high pressure gas injection cleaning, high pressure gas is injected from a gas pipe 13, and when the cleaning hoods are used for suction cleaning, the high pressure gas which is blown out is collected by the hood body and sent to the gas pipe, the width of the hood body 13 is the same as the width of the heat exchange grid, and the length thereof is installed along the direction of the tangent to the rotation of the heat exchange grid, so that the high pressure cleaning gas which is blown out from the opposite side can be collected to the maximum extent. The filter screen of upper and lower pipeline is removable structure, plays the filterable effect of gas that will clean, avoids the dust of sweeping out to get into the reacting furnace once more.
When the cleaning device is in a cleaning working state of upper air injection and lower air suction, as shown in fig. 3, valves A1 and A2 are opened, valves B1 and B2 are closed, the fan operates, the upper cleaning oil cylinder and the lower cleaning oil cylinder respectively and synchronously drive the cleaning covers to enter a GGH working area, and the oil cylinders are provided with accurate position detection elements, so that the upper cleaning cover and the lower cleaning cover can be ensured to be accurately stopped at specific heat exchange grid positions, and the two cleaning covers are superposed in the vertical direction of the GGH. At this time, gas in the heat exchange grid at the lower part of the GGH is sucked by the lower cleaning cover at negative pressure, enters the inlet of the fan through the lower cleaning pipeline, the filter screen, the gas pressurizing pipeline and the valve a2, is pressurized by the fan to form high-pressure cleaning gas, reaches the upper cleaning cover from the outlet of the fan through the valve a1, the gas pressurizing pipeline, the filter screen and the upper cleaning pipeline, and cleans the heat exchange grid by the high-pressure gas from top to bottom, and the flow of the cleaning gas is shown as a dotted arrow in fig. 3. The generated dust-containing gas is sucked by the lower cleaning cover, and the cleaning gas is repeatedly utilized, so that the circular cleaning effect is achieved. When the cleaning device is in a cleaning state of lower air injection and upper air suction, as shown in fig. 4, valves a1 and a2 are closed, valves B1 and B2 are opened, the fan operates, the upper cleaning oil cylinder and the lower cleaning oil cylinder respectively and synchronously drive the cleaning covers to enter a GGH working area, and the oil cylinders are provided with accurate position detection elements, so that the upper cleaning cover and the lower cleaning cover can be ensured to be accurately stopped at specific heat exchange grid positions, and the two cleaning covers are superposed in the vertical direction of the GGH. At this time, gas in the heat exchange grid on the upper portion of the GGH is sucked by the upper portion cleaning cover in a negative pressure state, enters the inlet of the fan through the upper portion cleaning pipeline, the filter screen, the gas pressurizing pipeline and the valve B2, is pressurized by the fan to form high-pressure cleaning gas, reaches the lower portion cleaning cover from the outlet of the fan through the valve B1, the gas pressurizing pipeline, the filter screen and the upper portion cleaning pipeline, and is cleaned from top to bottom, and the flow diagram of the cleaning gas is shown as a dotted arrow in FIG. 4. The generated dust-containing gas is sucked by the lower cleaning cover, so that the dust-containing gas is repeatedly utilized and the effect of circular cleaning is achieved. After the heat exchange grid cleaning work of one area is finished, the upper cleaning oil cylinder and the lower cleaning oil cylinder respectively and synchronously drive the cleaning cover to reach the next heat exchange grid position for cleaning.
In this embodiment, the standard rotation speed N of the GGH is 1 cycle/minute, the distance D between the heat exchange grids is 0.4 meter, and the radius R of the GGH rotor is 3 meters, so as to ensure that each heat exchange grid is cleaned in the same time and strength in one cleaning period, the control system is required to control the cleaning time and the position of the oil cylinder according to the rotation speed N of the GGH, the radius R of the rotor at the distance D, GGH between the heat exchange grids, and the current position of the cleaning cover, thereby improving the cleaning effectiveness of the online cleaning device. When the cleaning cover is arranged for cleaning the outermost heat exchange grid, the required standard cleaning time T is 4 minutes, after the cleaning cover stays for 4 hours at the outermost circle to clean the heat insulation grid, the upper cleaning oil cylinder and the lower cleaning oil cylinder synchronously push the upper cleaning cover and the lower cleaning cover to move for 0.4 meter along the axis direction respectively, the heat exchange grid at the 1 st layer is cleaned, the GGH rotating speed is changed to 0.8N at the moment, and the required time is up to
After cleaning, the oil cylinder pushes the cleaning cover to move for 0.4 m to clean the 2 nd layer heat exchange grid, the GGH rotating speed is changed to 1.2N, and the required time is shortened
And the rest can be done by analogy until the cleaning of the last layer is finished. At this time, the states of the valves A1, A2, B1 and B2 are changed to realize the switching of the air injection and air suction working states of the cleaning hood, and the nth layer of heat exchange grating on the inner surface is cleaned for the required time
After cleaning is finished, the upper cleaning oil cylinder and the lower cleaning oil cylinder respectively pull the upper cleaning cover and the lower cleaning cover synchronously along the axis direction to move for 0.4 m, so as to clean the (n-1) th layer of heat exchange grid within the required time
And the rest can be done in the same way until the cleaning of the outermost layer is finished.
After the cleaning in one period is finished, the upper cleaning oil cylinder and the lower cleaning oil cylinder respectively place the upper cleaning cover and the lower cleaning cover in the original positions, the operation of the fan is stopped, all the valves are closed, the filter screen is checked and cleaned, and the online cleaning in the next period is prepared.
It should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and all equivalent modifications and substitutions based on the above-mentioned technical solutions are within the scope of the present invention as defined in the claims.
Claims (7)
1. The on-line circulating cleaning device for the heat exchanger is characterized by comprising a booster fan, a hydraulic control system, valves A1, A2, B1 and B2, a gas boosting pipeline, an upper cleaning oil cylinder, an upper cleaning pipeline, a support bracket, an upper cleaning cover, a lower cleaning oil cylinder, a lower cleaning pipeline and a lower cleaning cover.
The upper cleaning oil cylinder and the lower cleaning oil cylinder are both provided with position detection signal equipment, the telescopic length of the upper cleaning oil cylinder and the lower cleaning oil cylinder is accurately controlled by a hydraulic control system, so that an upper cleaning cover and a lower cleaning cover can be synchronously and accurately positioned around a flue gas heat exchanger (GGH), the upper cleaning pipeline and the lower cleaning pipeline are of telescopic structures and are used for connecting the cleaning cover and a gas pressurization pipeline, the cleaning cover is driven by the oil cylinders to move, high-pressure gas is supplied to the cleaning cover or the cleaned gas is absorbed, valves A1, A2, B1 and B2 are arranged on the gas pressurization pipeline, the flow direction of the high-pressure gas in the pipeline is changed by switching, and the switching of the gas injection and gas suction processes of the upper cleaning cover and the lower.
2. The on-line circulation cleaning device for the heat exchanger as claimed in claim 1, wherein the upper cleaning pipeline and the lower cleaning pipeline are provided with filter screens.
3. The on-line circulation sweeping device of the heat exchanger as claimed in claim 1, wherein the structures of the upper sweeping hood and the lower sweeping hood are both provided as hood type structures.
4. The on-line circulation cleaning device for the heat exchanger as claimed in claim 3, wherein the upper cleaning cover and the lower cleaning cover each comprise a two-part structure of a cover body and a gas pipeline, when the cleaning cover is used for high-pressure gas injection cleaning, high-pressure gas is ejected from the gas pipeline, and when the cleaning cover is used for suction cleaning, the high-pressure gas which is cleaned is collected by the cover body and sent to the gas pipeline.
5. The on-line circulation cleaning device for the heat exchanger as claimed in claim 4, wherein the width of the cover body is consistent with that of the heat exchange grid, and the length of the cover body is arranged along the direction of the running rotation tangent of the heat exchange grid.
6. A cleaning method using the on-line circulation cleaning apparatus as set forth in claims 1 to 5, characterized in that the method is as follows:
when the upper cleaning cover is used for air injection cleaning and the lower cleaning cover is used for air suction cleaning, the valves A1 and A2 are opened, the valves B1 and B2 are closed, high-pressure gas generated from the outlet of the fan after the fan is started reaches the upper cleaning cover through the gas pressurization pipeline, the valve A1, the filter screen and the upper cleaning pipeline, the high-pressure gas is sucked into the lower cleaning cover after cleaning the heat exchange grid from top to bottom in the vertical direction of GGH, and enters the inlet of the fan through the lower cleaning pipeline 10, the filter screen, the valve A2 and the gas pressurization pipeline, so that circular cleaning is completed;
when the lower cleaning hood is used for air injection cleaning and the upper cleaning hood is used for air suction cleaning, the valves B1 and B2 are opened, the valves A1 and A2 are closed, high-pressure gas generated from the outlet of the fan after the fan is started reaches the lower cleaning hood through the gas pressurizing pipeline, the valve B1, the filter screen and the lower cleaning pipeline, the high-pressure gas is sucked into the upper cleaning hood after cleaning the heat exchange grid from bottom to top in the vertical direction of GGH, and enters the inlet of the fan through the upper cleaning pipeline, the filter screen, the valve B2 and the gas pressurizing pipeline, so that circular cleaning is completed, and most of the gas can be sucked back through the circulating pipeline after the high-pressure cleaning gas finishes cleaning the GGH grid body.
When the cleaning device is in a stop state, the fan stops running, the valves A1, A2, B1 and B2 are in a closed state, the upper cleaning oil cylinder and the lower cleaning oil cylinder are in cleaning original positions, and the upper cleaning cover and the lower cleaning cover are outside the GGH heat exchange grid and are overlapped in the vertical direction.
7. The control method of the on-line circulating cleaning device of the heat exchanger is characterized by comprising the following steps:
when the cleaning cover is used for cleaning the outermost heat exchange grid, the standard time required for cleaning at the standard rotating speed N is T, and when the rotating speed of the GGH is adjusted to Nn (the rotating speed when the nth heat exchange grid is cleaned), the cleaning time of the heat exchange grid at the position needs to be adjusted to Nn
After the cleaning cover stays for T time at the outermost circle to complete cleaning of the heat insulation grid, the upper cleaning oil cylinder and the lower cleaning oil cylinder respectively synchronously push the upper cleaning cover and the lower cleaning cover to move for a distance D along the axis direction to start cleaning the layer 1 heat exchange grid for the required time
After cleaning is finished, the oil cylinder pushes the cleaning cover to move for a distance D to clean the 2 nd layer of heat exchange grid for the required time
And repeating the steps until the last layer is cleaned, switching the air injection state and the air suction state of the cleaning cover by changing the states of the valves A1, A2, B1 and B2, cleaning the nth layer of heat exchange grating in the cleaning cover, and taking time
After cleaning is finished, the upper cleaning oil cylinder and the lower cleaning oil cylinder respectively synchronously pull the upper cleaning cover and the lower cleaning cover along the axis direction for a distance D to clean the (n-1) th layer of heat exchange grid for the required time
And so on until finishing cleaning the outermost layer;
after the cleaning in one period is finished, the upper cleaning oil cylinder and the lower cleaning oil cylinder respectively place the upper cleaning cover and the lower cleaning cover in the original positions, the operation of the fan is stopped, all the valves are closed, the filter screen is checked and cleaned, and the online cleaning in the next period is prepared.
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Application publication date: 20201225 |