Automatic cleaning control circuit for wet dust removal system

Abstract

The utility model discloses a wet dust removal system automatic cleaning control circuit, and the start -stop control branch of belt conveyor includes the coil of stop button SB1, start button SB2, belt conveyor contactor KM1 that set up in proper order series connection, and the start -stop control branch of dust removal spray includes the coil of first time relay KT1's normally open contact, belt conveyor contactor KM1 that set up in proper order series connection, and the start -stop control branch of fan includes the coil of fan contactor KM2, and the normally open contact of first time relay, the normally closed contact of second intermediate relay that set up in proper order series connection, and the control branch of filter screen cleaning includes the coil of filter screen cleaning electromagnetic valve YV2, and the coil of second time relay KT2's delay break contact and filter screen cleaning electromagnetic valve YV2 between parallel connection have the coil of second time relay KT2, and the coil of second time relay KT2's delay break contact and filter screen cleaning electromagnetic valve YV2 between parallel connection have the coil of second time relay KT2.

Description

Technical Field

[0001] This utility model relates to the field of cleaning technology, specifically to an automatic cleaning control circuit for a wet dust removal system. Background Technology

[0002] Wet scrubbers mainly consist of a fan, a dust-suppressing spray system, a dust collector, a dewatering unit, and a filter bag housing. When the fan starts, air is rapidly discharged from the dust collector, while simultaneously, dust-laden gas, under atmospheric pressure, enters the dust collector along the flue, where it mixes thoroughly with the washing water mist sprayed by the dust-suppressing spray system. Fine dust particles in the flue gas agglomerate into larger aggregates. Under the action of the cyclone guide fluid inside the dust collector, the dust-laden flue gas and the washing liquid have ample time to interact and capture the dust particles. In the dewatering unit, the liquid containing the captured dust is separated from the purified gas. Finally, the purified gas is passed through the filter bag housing for secondary dust removal, thus achieving the purification of the dust-laden gas.

[0003] Wet scrubbing devices are often used in conjunction with sedimentation tanks, water tanks, and filters to form a wet scrubbing system. The gas purified by the filter bags can be directly discharged into the atmosphere or used as circulating air to achieve zero emissions. The separated washing liquid flows back to the sedimentation tank, is recovered to the water tank after sedimentation, and is used as washing water mist and filter bag cleaning liquid after filtration.

[0004] During the operation of wet dust collection systems, it is common for the filter screens to become clogged due to forgetting to clean them after the fan starts running, or for the water valves in the dust collection spray system to be left open. This results in the fan operating without water, causing the dust concentration inside the equipment to reach explosive limits. Furthermore, the static electricity or high temperature generated by dry friction may ignite the dust, leading to an explosion, posing a significant safety hazard. Currently, the dust collection spray system of the wet dust collection system requires manual control, and the filter screens of the filter bags in the filter box need to be cleaned manually and periodically. However, this lack of effective management leads to problems of forgetting or missing cleaning. Utility Model Content

[0005] The purpose of this invention is to provide an automatic cleaning control circuit for a wet dust removal system.

[0006] This utility model is implemented by the following technical solution: an automatic cleaning control circuit for a wet dust removal system, which includes a belt conveyor start / stop control branch, a dust removal spray start / stop control branch, a fan start / stop control branch, and a filter screen cleaning control branch.

[0007] The belt conveyor start / stop control branch includes a stop button SB1, a start button SB2, and the coil of the belt conveyor contactor KM1, which are connected in series. The start button SB2 is connected in parallel with the normally open contact of the belt conveyor contactor KM1.

[0008] The dust removal spray start / stop control branch includes the normally open contact of the belt conveyor contactor KM1 and the coil of the first time relay KT1, which are connected in series. The coil of the first time relay KT1 is connected in parallel with the coil of the dust removal spray solenoid valve YV1.

[0009] The fan start / stop control branch includes a normally open contact of a first time relay KT1, a normally closed contact of a second intermediate relay KA2, and a coil of a fan contactor KM2, which are connected in series.

[0010] The filter screen cleaning control branch includes a normally closed contact of the fan contactor KM2, a delayed disconnect contact of the second time relay KT2, and a coil of the filter screen cleaning solenoid valve YV2, which are connected in series. The coil of the second time relay KT2 is connected in parallel between the delayed disconnect contact of the second time relay KT2 and the coil of the filter screen cleaning solenoid valve YV2.

[0011] Furthermore, it also includes a manual control branch, which includes a stop button SB3, a start button SB4, and the coil of a first intermediate relay KA1 arranged in series. The start button SB4 is connected in parallel with the normally open contact of the first intermediate relay KA1.

[0012] Furthermore, the dust removal spray start / stop control branch also includes a normally open contact of the first intermediate relay KA1, which is connected in parallel with the normally open contact of the belt conveyor contactor KM1.

[0013] Furthermore, it also includes a filter bag cleaning control branch, which includes a delayed closing contact of a second time relay KT2, a normally closed contact of a third time relay KT3, and a coil of a filter bag cleaning solenoid valve YV3 connected in series. The coil of the filter bag cleaning solenoid valve YV3 is connected in parallel with the coil of the third time relay KT3.

[0014] Furthermore, it also includes a warning branch and an indicator branch connected in parallel. The warning branch includes a water flow sensing switch K and a coil of a second intermediate relay KA2 connected in series. The indicator branch includes a normally open contact of the second intermediate relay KA2 and an indicator light HL connected in series.

[0015] The advantages of this utility model are: under the action of the belt conveyor start / stop control branch, the dust removal spray start / stop control branch and the fan start / stop control branch, the dust removal spray and fan control are interlocked with the operation of the belt conveyor. At the same time, the dust removal spray automatically starts before the fan, which solves the problem of forgetting to open the water valve of the dust removal spray system in the prior art and solves the technical problem of the fan running without water.

[0016] Under the control of the filter screen cleaning branch, after the dust removal is completed and the fan stops running, the filter screen automatically completes backwashing and sends the backwash water to the sedimentation tank for sedimentation, which reduces the problem of difficult control by manual cleaning and ensures the timeliness of cleaning.

[0017] The filter bag cleaning control branch is activated periodically to clean the filter bags, reducing the problem of missed cleaning, and timely cleaning also ensures cleaning efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the wet dust removal system of this utility model;

[0020] Figure 2 This is a schematic diagram of the control circuit of the present invention;

[0021] Figure 3 This is the main circuit diagram of the belt conveyor and fan of this utility model;

[0022] In the diagram: Belt conveyor M1, fan M2, stop button SB1, start button SB2, stop button SB3, start button SB4, belt conveyor contactor KM1, fan contactor KM2, dust removal spray solenoid valve YV1, filter screen cleaning solenoid valve YV2, filter bag cleaning solenoid valve YV3, first time relay KT1, second time relay KT2, water flow sensor switch K, pipeline no water audible and visual alarm HL, first intermediate relay KA1, second intermediate relay KA2;

[0023] Wet dust collector 1. Sedimentation tank 2. Water tank 3. Filter 4. Belt conveyor start / stop control branch 5. Dust removal spray start / stop control branch 6. Fan start / stop control branch 7. Filter screen cleaning control branch 8. Manual control branch 9. Filter bag cleaning control branch 10. Early warning branch 11. Indicator branch 12. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] like Figure 1 As shown, the wet dust collection system includes a wet dust collection device 1, a sedimentation tank 2, a water tank 3, and a filter 4. The wet dust collection device 1 includes a fan, a dust removal spray system, a dust collector, a dewatering device, and a filter bag box. The outlet of the dewatering device and the outlet of the filter bag box are connected to the inlet pipeline of the sedimentation tank 2. The overflow port of the sedimentation tank 2 is connected to the inlet pipeline of the water tank 3. The outlet of the water tank 3 is connected to the inlet pipeline of the filter 4 through a water flow sensing switch K. The outlet of the filter 4 is connected to the nozzle pipeline of the wet dust collection device 1 through a dust removal spray solenoid valve YV1. The outlet of the filter 4 is connected to the cleaning nozzle pipeline of the filter bag box through a filter screen cleaning solenoid valve YV2. The sewage outlet of the filter 4 is connected to the inlet of the sedimentation tank 2 through a pipeline.

[0026] like Figure 2-3 As shown, the automatic cleaning control circuit of the wet dust removal system includes a belt conveyor start / stop control branch 5, a dust removal spray start / stop control branch 6, a fan start / stop control branch 7, and a filter screen cleaning control branch 8.

[0027] The belt conveyor start / stop control branch 5 includes a stop button SB1, a start button SB2, and the coil of the belt conveyor contactor KM1, which are connected in series. The start button SB2 is connected in parallel with the normally open contact of the belt conveyor contactor KM1.

[0028] The dust removal spray start / stop control branch 6 includes the normally open contact of the belt conveyor contactor KM1 and the coil of the first time relay KT1, which are connected in series. The coil of the first time relay KT1 is connected in parallel with the coil of the dust removal spray solenoid valve YV1.

[0029] The fan start / stop control branch 7 includes a normally open contact of a first time relay KT1, a normally closed contact of a second intermediate relay KA2, and a coil of a fan contactor KM2, which are connected in series.

[0030] Working principle: Under the action of belt conveyor M1 start / stop control branch 5, dust removal spray start / stop control branch 6 and fan start / stop control branch 7, the dust removal spray and fan control are interlocked with the operation of the belt conveyor. At the same time, the dust removal spray automatically starts before the fan M2, which solves the problem of forgetting to open the water valve of the dust removal spray system in the existing technology and solves the technical problem of the fan M2 running without water.

[0031] The filter screen cleaning control branch 8 includes a normally closed contact of the fan contactor KM2, a delayed disconnect contact of the second time relay KT2, and a coil of the filter screen cleaning solenoid valve YV2, which are connected in series. The coil of the second time relay KT2 is connected in parallel between the delayed disconnect contact of the second time relay KT2 and the coil of the filter screen cleaning solenoid valve YV2.

[0032] Working principle: Under the action of filter screen cleaning control branch 8, after the dust removal is completed and the fan stops running, the filter screen of filter 4 automatically completes backwashing and sends the backwash water to sedimentation tank 2 for sedimentation. This reduces the problem of difficult control by manual cleaning and ensures the timeliness of cleaning. Later, the overflow water after sedimentation in sedimentation tank 2 is sent to water tank 3 for storage. After being filtered by filter 4, it is reused as dust removal spray water and filter bag cleaning water.

[0033] It also includes a manual control branch 9, which includes a stop button SB3, a start button SB4, and the coil of the first intermediate relay KA1 connected in series. The start button SB4 is connected in parallel with the normally open contact of the first intermediate relay KA1. The dust removal spray start / stop control branch 6 also includes the normally open contact of the first intermediate relay KA1. The normally open contact of the first intermediate relay KA1 is connected in parallel with the normally open contact of the belt conveyor contactor KM1.

[0034] Working principle: With the cooperation of manual control branch 9, dust removal spray start / stop control branch 6, and fan start / stop control branch 7, when the fan M2 and dust removal spray cannot be normally controlled by the interlock of belt conveyor M1, the fan M2 and dust removal spray can be manually controlled to start automatically.

[0035] It also includes a filter bag cleaning control branch 10, which includes a delayed closing contact of a second time relay KT2, a normally closed contact of a third time relay KT3, and a coil of a filter bag cleaning solenoid valve YV3 connected in series. The coil of the filter bag cleaning solenoid valve YV3 is connected in parallel with the coil of the third time relay KT3.

[0036] Working principle: The filter bag cleaning control branch 10 is activated periodically to clean the filter bags, reducing the problem of missed cleaning, and timely cleaning can also ensure cleaning efficiency.

[0037] It also includes a warning branch 11 and an indicator branch 12 connected in parallel. The warning branch 11 includes a water flow sensing switch K and a coil of the second intermediate relay KA2 connected in series. The indicator branch 12 includes a normally open contact of the second intermediate relay KA2 and an indicator light HL connected in series. When there is no water in the pipeline, the indicator light will show the abnormal situation and the water tank 3 and the circulation pipeline will be inspected.

[0038] The specific operation process of this embodiment is as follows:

[0039] 1. Dust suppression spray start / stop control:

[0040] In the belt conveyor start / stop control branch 5, when the start button SB2 is pressed, the coil of the belt conveyor contactor KM1 is energized, and the belt conveyor M1 starts.

[0041] In the dust removal spray start / stop control branch 6, the normally open contact of the belt conveyor contactor KM1 closes, the dust removal spray solenoid valve YV1 opens, and at the same time the coil of the first time relay KT1 is energized and the timing begins;

[0042] In the fan start-stop control branch 7, after the time set by the first time relay KT1 is reached, the normally open contact of the first time relay KT1 closes, the coil of the fan contactor KM2 is energized, and the fan M2 runs automatically. During normal startup, water needs to be sprayed first and then the fan M2 is started, which can reduce the dust concentration in the equipment from reaching the explosion limit under waterless conditions.

[0043] In the belt conveyor start / stop control branch 5, after pressing the stop button SB1, when the belt conveyor stops running, the coil of the belt contactor KM1 is de-energized. In the dust removal spray start / stop control branch 6, the normally open contact of the belt contactor KM1 opens, the coil of the dust removal spray solenoid valve YV1 is de-energized, the dust removal spray solenoid valve YV1 closes, the dust removal spray stops, the first time relay KT1 is de-energized, the coil of the fan contactor KM2 is de-energized, and the fan stops running.

[0044] 2. Filter 4: Filter screen reverse cleaning start / stop control

[0045] In the filter screen cleaning control branch 8, after the blower M2 stops running due to power failure, the normally closed contact of the blower contactor KM2 closes, the filter screen cleaning solenoid valve YV2 is energized and opens, backwashing the filter screen of filter 4 and sending the discharged sewage to the sedimentation tank 2. At the same time, the coil of the second time relay KT2 is energized. After the set time is reached, the normally closed contact of the second time relay KT2 opens after the energization delay, the coil of the filter screen cleaning solenoid valve YV2 is de-energized and closes, and the filter screen of filter 4 stops cleaning.

[0046] In the filter bag cleaning control branch 10, the normally open contact of the second time relay KT2 closes after a power-on delay, the filter bag cleaning solenoid valve YV3 is energized and opens, and the filter bags in the filter bag box begin to be cleaned. At the same time, the coil of the third time relay KT3 is energized. After the set time is reached, the normally closed contact of the third time relay KT3 opens, the coil of the filter bag cleaning solenoid valve YV3 is de-energized and stops, and the cleaning of the filter bags stops.

[0047] 3. Early warning and control

[0048] In the early warning branch 11, when there is no water in the pipeline, the water flow sensing switch K closes, and the coil of the second intermediate relay KA2 is energized;

[0049] In the fan start / stop control branch 7, the normally closed contact of the second intermediate relay KA2 is open, and the coil of the fan contactor KM2 will not be able to start.

[0050] In indicator branch 12, when the normally open contact of the second intermediate relay KA2 closes, the water-free pipeline audible and visual alarm HL sounds, reminding the operator to check the water supply pipeline;

[0051] In manual control branch 9, when the equipment is under maintenance, the start button SB4 can be pressed to manually start the dust removal spray solenoid valve YV1 and the fan M2 through the first intermediate relay KA1, and start and stop can be achieved through manual control.

[0052] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An automatic cleaning control circuit for a wet dust removal system, characterized in that, It includes a belt conveyor start / stop control branch, a dust removal spray start / stop control branch, a fan start / stop control branch, and a filter screen cleaning control branch; The belt conveyor start / stop control branch includes a stop button SB1, a start button SB2, and the coil of the belt conveyor contactor KM1, which are connected in series. The start button SB2 is connected in parallel with the normally open contact of the belt conveyor contactor KM1. The dust removal spray start / stop control branch includes the normally open contact of the belt conveyor contactor KM1 and the coil of the first time relay KT1, which are connected in series. The coil of the first time relay KT1 is connected in parallel with the coil of the dust removal spray solenoid valve YV1. The fan start / stop control branch includes a normally open contact of a first time relay KT1, a normally closed contact of a second intermediate relay KA2, and a coil of a fan contactor KM2, which are connected in series. The filter screen cleaning control branch includes a normally closed contact of the fan contactor KM2, a delayed disconnect contact of the second time relay KT2, and a coil of the filter screen cleaning solenoid valve YV2, which are connected in series. The coil of the second time relay KT2 is connected in parallel between the delayed disconnect contact of the second time relay KT2 and the coil of the filter screen cleaning solenoid valve YV2.

2. The automatic cleaning control circuit for the wet dust removal system according to claim 1, characterized in that, It also includes a manual control branch, which includes a stop button SB3, a start button SB4, and the coil of a first intermediate relay KA1 arranged in series. The start button SB4 is connected in parallel with the normally open contact of the first intermediate relay KA1.

3. The automatic cleaning control circuit for the wet dust removal system according to claim 2, characterized in that, The dust removal spray start / stop control branch also includes a normally open contact of the first intermediate relay KA1, which is connected in parallel with the normally open contact of the belt conveyor contactor KM1.

4. The automatic cleaning control circuit for the wet dust removal system according to claim 3, characterized in that, It also includes a filter bag cleaning control branch, which includes a delayed closing contact of a second time relay KT2, a normally closed contact of a third time relay KT3, and a coil of a filter bag cleaning solenoid valve YV3 connected in series. The coil of the filter bag cleaning solenoid valve YV3 is connected in parallel with the coil of the third time relay KT3.

5. The automatic cleaning control circuit for the wet dust removal system according to claim 4, characterized in that, It also includes a warning branch and an indicator branch connected in parallel. The warning branch includes a water flow sensing switch K and a coil of a second intermediate relay KA2 connected in series. The indicator branch includes a normally open contact of the second intermediate relay KA2 and an indicator light HL connected in series.

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