CN106839809B

CN106839809B - Cross-flow square cooling tower device with dust removal and scale prevention functions and control method

Info

Publication number: CN106839809B
Application number: CN201710192901.9A
Authority: CN
Inventors: 郭永辉; 方永梅; 林志忠
Original assignee: Fujian University of Technology
Current assignee: Fujian University of Technology
Priority date: 2017-03-28
Filing date: 2017-03-28
Publication date: 2022-07-29
Anticipated expiration: 2037-03-28
Also published as: CN106839809A

Abstract

The invention provides a cross-flow square cooling tower device with dust removal and scale prevention functions, which comprises a cooling water system, a rainwater collection and purification system, a fire water tank system, a dust removal system, a control device, a temperature sensor and a water cooling unit, wherein the cooling water system is connected with the control device through a pipeline; the cooling water system is communicated with the water cooling unit and is used for exchanging heat with the water cooling unit; the rainwater collection and purification system is communicated with the dust removal system and is used for supplying water to the dust removal system; the fire-fighting water system is communicated with the cooling water system and is used for cooling the cooling water system; the temperature sensor is used for detecting the temperature of cooling water which is exchanged heat from the water cooling unit, and sending a signal to the control device, and the control device controls the whole system to operate. The invention has the advantages that: the scaling problem of the cross flow square cooling tower can be reduced, the heat exchange efficiency is improved, and the operation cost is reduced; the loss of cooling water amount during heat exchange can be reduced, the heat exchange efficiency of the transverse flow square cooling tower is improved, and the stability of the system is improved.

Description

Cross-flow square cooling tower device with dust removal and scale prevention functions and control method

Technical Field

The invention relates to the technical field of cooling water, in particular to a transverse flow square cooling tower device with dust removal and scale prevention functions and a control method.

Background

Along with the continuous development of economic society, people demand higher and higher to the comfort level of indoor space, this makes water chiller and cooling tower complex central air conditioning also more and more popular, consequently, the cooling tower has also obtained large-scale use, and fire water tank is the necessary device of fire control again simultaneously. The existing cooling tower and fire water tank have the following problems in the using process:

(1) the cooling tower packing structure is prone to fouling. Research shows that cooling water is heated after heat exchange in the water cooling unit, the higher the temperature of the cooling water entering the cooling tower is, the lower the scale inhibition rate is, and on the contrary, the higher the scale formation rate is. Therefore, when the temperature of water entering the cooling tower in the cooling water system is too high, scale is easy to form, the heat exchange efficiency of the cooling tower is reduced, the operation effect of the whole air-conditioning system is further influenced, and the great operation cost loss is caused.

(2) As air pollution becomes more and more serious, the air contains more and more dust, which makes the air easily scale on the packing after entering the cooling tower.

(3) The fire water tank can be used except when a fire disaster happens, and all the other time does not work, so the fire water is static and free of mobility, scale is easily generated on the wall surface and the bottom of the fire water tank, and the later cleaning is inconvenient and the pipeline is blocked.

(4) When the cooling tower works, a large amount of water can be taken away in the heat exchange process of air and cooling water, so that the cooling water system needs to be supplemented with water frequently, and the water is supplemented through a large amount of tap water in the conventional method, so that the waste of water resources is caused.

In view of the above problems, some solutions have been proposed in the prior art. For example, the application date is: 2016.3.21, application number: 201620219012.8 discloses a descaling device for cooling tower filler, which can realize self-cleaning of the cooling tower, avoid the decrease of heat exchanger efficiency caused by ash accumulation and hardening of the cooling tower filler, but does not consider the problem of water supplement; for example, the application date is: 2013.12.03, application number: 201320788410.8 discloses a fire water tank cold accumulation system for a chilled water system, which utilizes the cold accumulation capacity of the fire water tank but does not take into account the scaling problem of the fire water tank; as another example, the application date is: 2010.05.24, application number: 201010180553.1 discloses a sand-proof and dust-removing device for cooling tower, which solves the problem of sand-proof, but does not consider the influence of wind resistance on the efficiency of the cooling tower.

Although these techniques can improve some aspects of the problems, none of them have completely solved the above problems fundamentally. Therefore, how to fundamentally solve the problems of cooling tower scaling, dust prevention, water supplement and fire water tank scaling also becomes an urgent need.

Disclosure of Invention

The invention aims to solve one of the technical problems, and provides a transverse flow square cooling tower device with dust removal and scale prevention functions, which is used for fundamentally solving the problems of scaling of a cooling tower, dust prevention, water supplement and scaling of a fire water tank.

The invention realizes one of the technical problems as follows: the cooling tower device comprises a cooling water system, a rainwater collecting and purifying system, a fire water tank system, a dust removing system, a control device, a temperature sensor and a water cooling unit;

the cooling water system comprises a transverse flow square cooling tower, a spraying water storage tank, a variable frequency spraying water pump and a cooling water pump; the top of the transverse flow square cooling tower is connected with the water outlet side of the water cooling unit through a cooling tower water return pipe, and a first electromagnetic valve is arranged on the cooling tower water return pipe; the bottom of the transverse flow square cooling tower is connected with the spraying water storage tank through a cooling tower water supply pipe, and a second electromagnetic valve is arranged on the cooling tower water supply pipe; the cooling tower water return pipe is connected with the cooling tower water supply pipe through a bypass pipe, and a third electromagnetic valve is arranged on the bypass pipe; the bottom of the spraying water storage tank is connected with the water inlet side of the water cooling unit through a water storage tank water outlet pipe, and the cooling water pump is arranged on the water storage tank water outlet pipe; the top of the transverse flow square cooling tower is also connected with the spraying water storage tank through a secondary spraying pipe, and the variable-frequency spraying water pump is arranged on the secondary spraying pipe;

the fire-fighting water tank system comprises a fire-fighting water tank, an ejector, a fire-fighting pipe network, a tap water replenishing pipe and a first liquid level sensor; the ejector is arranged on the cooling tower water return pipe, and the first liquid level sensor is arranged on the inner wall of the fire water tank; the lower part of the fire-fighting water tank is connected with the ejector through a fire-fighting water tank water outlet pipe, and a fourth electromagnetic valve is arranged on the fire-fighting water tank water outlet pipe; the fire-fighting pipe network is connected with the bottom of the fire-fighting water tank; the upper part of the fire water tank is connected with the tap water replenishing pipe, and a fifth electromagnetic valve is arranged at the position where the tap water replenishing pipe is connected with the fire water tank;

the dust removal system comprises a filter, a flusher, a water sprayer and a filter residue pool; the filter is arranged at the outer side of the air inlet of the cross flow square cooling tower, and a water spraying area is formed between the filter and the cross flow square cooling tower; the flusher is arranged right above the filter, the water sprayer is arranged right above the water spraying area, and the filter residue pool is arranged below the filter;

the flusher, the water sprayer, the residue filtering pond and the fire water tank are all connected with the rainwater collecting and purifying system; the temperature sensor is arranged on the cooling tower water return pipe on the water outlet side of the water cooling unit; the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve, the fifth electromagnetic valve, the transverse flow square cooling tower, the variable-frequency spray water pump, the cooling water pump, the temperature sensor and the first liquid level sensor are all electrically connected with the control device.

Furthermore, the rainwater collection and purification system comprises a rainwater collection container, a rainwater delivery pump and a second liquid level sensor, wherein the second liquid level sensor is arranged on the inner wall of the rainwater collection container; the upper part of the fire water tank is connected with the rainwater collecting container through an overflow water pipe; the lower part of the rainwater collection container is respectively connected with the flusher and the water sprayer through a rainwater conveying pipe, the rainwater conveying pump is arranged on the rainwater conveying pipe, and a sixth electromagnetic valve is arranged at the position where the rainwater conveying pipe is connected with the flusher; the filter residue pool is connected with the rainwater collecting container through a rainwater return pipe; the upper part of the rainwater collecting container is connected with the tap water replenishing pipe, and a seventh electromagnetic valve is arranged at the position where the tap water replenishing pipe is connected with the rainwater collecting container; the rainwater delivery pump, the second liquid level sensor, the sixth electromagnetic valve and the seventh electromagnetic valve are all electrically connected with the control device.

Further, the spraying water storage tank is arranged above the interior of the fire water tank; the upper part of the spraying water storage tank is provided with an overflow drain pipe which is arranged at a position 5cm higher than the normal liquid level of the fire water tank.

Further, the water cooling unit is arranged in the machine room, and the cross-flow square cooling tower, the rainwater collecting container, the fire water tank and the control device are all arranged on the roof.

Furthermore, a plurality of flushing nozzles are arranged on the flusher, and each flushing nozzle faces the filter.

The second technical problem to be solved by the invention is to provide a control method of a cross-flow square cooling tower device with dust removal and scale prevention functions, and the control method is used for fundamentally solving the problems of scaling of the cooling tower, dust prevention, water supplement and scaling of a fire water tank.

The invention realizes the second technical problem in the following way: the control method of the cross-flow square cooling tower device with the dust removal and scale prevention functions needs to use the cooling tower device; the method comprises the following steps:

step 1, setting a high liquid level critical value Hx1 and a low liquid level critical value Hx2 of a fire water tank, testing an actual liquid level value Hx in the fire water tank in real time through a first liquid level sensor, comparing the Hx with Hx1 and Hx2 respectively, and supplementing or draining water to the fire water tank according to a comparison result;

step 2, setting a high water level critical value Hy1 and a low water level critical value Hy2 of the rainwater collection container, testing an actual liquid level value Hy in the rainwater collection container in real time through a second liquid level sensor, comparing the Hy with Hy1 and Hy2 respectively, and supplementing water or draining the rainwater collection container according to a comparison result;

step 3, setting a high-load outlet water temperature critical value t1 and a low-load outlet water temperature critical value t2 of the water cooling unit, testing the outlet water temperature value t of the cooling water of the water cooling unit in real time through a temperature sensor, comparing the t with t1 and t2 respectively, and controlling the cross-flow square cooling tower to stop if the temperature sensor continuously tests that t is less than t2, and cooling the cooling water only through heat exchange of a spraying water storage tank; if the temperature sensor continuously detects that t is not less than t1 and is not more than t2, the water in the cross-flow square cooling tower and the fire water tank is started to carry out double cooling on the cooling water; if the temperature sensor continuously detects that t is more than t1, starting water in the cross-flow square cooling tower and the fire water tank to carry out double cooling on cooling water;

step 4, controlling a flusher to clean and remove dust of the filter according to the comparison result of t with t1 and t 2;

and 5, controlling the spraying water storage tank and the tap water replenishing pipe to simultaneously replenish water to the fire water tank through the control device when a fire disaster occurs.

Further, in the step 1, "comparing Hx with Hx1 and Hx2, respectively, and performing water replenishing or draining on the waterproof tank according to the comparison result" specifically includes:

if the first liquid level sensor continuously detects that Hx is less than Hx2, the fire water tank needs to be replenished with water, at the moment, the control device controls the fifth electromagnetic valve to be opened, the tap water replenishing pipe replenishes water to the fire water tank, and the control device controls the fifth electromagnetic valve to be closed until the Hx reaches Hx1 after the water is replenished, so that the water replenishing is finished;

if Hx is larger than Hx1, which is continuously detected by the first liquid level sensor, the fire water tank needs to be drained, the fifth electromagnetic valve is controlled to be closed by the control device, redundant water in the fire water tank is drained to the rainwater collection container through the overflow water pipe, and the drainage is stopped until the Hx reaches Hx 1;

if Hx is not less than Hx1 and not more than Hx2 continuously measured by the first liquid level sensor, the fifth electromagnetic valve is controlled to be closed by the control device, and water is not supplemented and drained to the fire water tank;

in the step 2, the "comparing Hy with Hy1 and Hy2, respectively, and replenishing or draining the rainwater collection container according to the comparison result" includes:

if the second liquid level sensor continuously detects that Hy is less than Hy2, the rainwater collection container needs to be replenished with water, at the moment, the control device controls the seventh electromagnetic valve to be opened, the tap water replenishing pipe replenishes water for the rainwater collection container, and the control device controls the seventh electromagnetic valve to be closed until Hy reaches Hy1 after water is replenished, so that water replenishing is finished;

if the second liquid level sensor continuously detects that Hy is larger than Hy1, the rainwater collection container needs to be drained, at the moment, the seventh electromagnetic valve is controlled to be closed through the control device, redundant water in the rainwater collection container is discharged into the fire-fighting water tank through the overflow water pipe, and drainage is stopped until Hy reaches Hy 1;

if the second liquid level sensor continuously detects that Hy is not less than 2 and not more than Hy1, the seventh electromagnetic valve is controlled to be closed through the control device, and water is not supplemented and drained to the rainwater collection container.

Further, the step 3 specifically includes:

setting a high-load outlet water temperature critical value t1 and a low-load outlet water temperature critical value t2 of the water cooling unit, testing the outlet water temperature value t of cooling water of the water cooling unit in real time through a temperature sensor, comparing the t with t1 and t2 respectively, and selecting one of the following three steps to execute according to a comparison result:

step A1, if the temperature sensor continuously detects that t is less than t2, the system is in a low-load working state, and at the moment, the temperature sensor sends a signal instruction to the control device; after receiving the signal instruction, the control device controls the cooling water pump to operate at a low frequency, controls the first electromagnetic valve, the second electromagnetic valve and the fourth electromagnetic valve to be closed, controls the third electromagnetic valve to be opened, and simultaneously controls the cross-flow square cooling tower, the variable-frequency spray water pump and the rainwater delivery pump to be stopped;

the cooling water is circulated at this time as follows: under the low-frequency operation of a cooling water pump, cooling water in the spray water storage tank enters a water cooling unit for heat exchange, the cooling water after heat exchange flows through a bypass pipe and returns to the spray water storage tank, meanwhile, the fire-fighting water in the fire-fighting water tank and the wall surface of the spray water storage tank are subjected to contact heat exchange, so that the temperature of the cooling water in the spray water storage tank is reduced, and then the step 4 is carried out;

a2, if the temperature sensor continuously detects that t is more than or equal to t2 and less than or equal to t1, the system is in a medium-load working state, and at the moment, the temperature sensor sends a signal instruction to the control device; after receiving the signal instruction, the control device controls the cooling water pump to operate at a medium frequency, controls the first electromagnetic valve, the second electromagnetic valve and the fourth electromagnetic valve to be opened, controls the third electromagnetic valve to be closed, and simultaneously controls the cross-flow square cooling tower to work, controls the variable-frequency spray water pump to work at a low frequency and controls the rainwater delivery pump to work at a low frequency;

the cooling water is circulated at this time as follows: under the medium-frequency operation of a cooling water pump, cooling water in a spraying water storage tank enters a water cooling unit for heat exchange, and when the cooling water after heat exchange flows through an ejector, the cooling water is mixed with fire-fighting water ejected from a fire-fighting water tank for cooling; then when the cooling water flows through the top of the transverse flow square cooling tower, the cooling water is mixed with the cooling water pumped by the variable-frequency spray water pump at low frequency again for cooling, and meanwhile, the air enters the transverse flow square cooling tower after being filtered by the filter and cooled by the water sprayed by the water sprayer; finally, cooling water enters a transverse flow square cooling tower for cooling, flows back to the spraying water storage tank through a water supply pipe of the cooling tower, and then enters the step 4;

a3, if the temperature sensor continuously detects that t is more than t1, the system is in a high-load working state, and at the moment, the temperature sensor sends a signal instruction to the control device; after receiving the signal instruction, the control device controls the cooling water pump to operate at high frequency, controls the first electromagnetic valve, the second electromagnetic valve and the fourth electromagnetic valve to be opened, controls the third electromagnetic valve to be closed, and simultaneously controls the cross-flow square cooling tower to work, controls the variable-frequency spray water pump to work at high frequency and controls the rainwater conveying pump to work at high frequency;

the cooling water is circulated at this time as follows: under the high-frequency operation of a cooling water pump, cooling water in a spraying water storage tank enters a water cooling unit for rapid heat exchange, and when the cooling water after heat exchange flows through an ejector, the cooling water is firstly mixed with fire-fighting water ejected from a fire-fighting water tank for cooling; then when cooling water flows through the top of the transverse flow square cooling tower, the cooling water is mixed with cooling water pumped by a variable-frequency spray water pump at high frequency again for cooling, and meanwhile, air enters the transverse flow square cooling tower after being filtered by a filter and cooled by water sprayed by a water sprayer; and finally, cooling water enters the transverse flow square cooling tower for cooling, flows back to the spraying water storage tank through a water supply pipe of the cooling tower, and then enters the step 4.

Further, the step 4 specifically includes:

if the temperature sensor continuously detects that t is less than t2, namely the system is in a low-load working state, the sixth electromagnetic valve is controlled to be closed through the control device, and cleaning and dust removing operations are not carried out;

if the temperature sensor continuously detects that T is more than or equal to T2 and less than or equal to T1, namely the system is in a medium-load working state, the sixth electromagnetic valve is controlled by the control device to be intermittently opened by taking T1 as a period, and the opening duration is 5 minutes, so that the filter is cleaned and dedusted by the flusher;

if the temperature sensor continuously detects that T is more than T1, namely the system is in a high-load working state, the sixth electromagnetic valve is controlled by the control device to be opened intermittently in a period of T2, and the opening duration is 5 minutes, so that the filter is cleaned and dedusted by the flusher.

Further, the step 5 specifically includes:

when a fire disaster happens, the control device controls the cooling water pump to operate at high frequency, controls the first electromagnetic valve, the second electromagnetic valve and the fourth electromagnetic valve to be closed, controls the third electromagnetic valve to be opened, controls the cross-flow square cooling tower and the variable-frequency spray water pump to be stopped, so that cooling water is rapidly pumped to the spray water storage tank through the cooling water pump, and water is supplemented to the fire water tank through an overflow drain pipe on the spray water storage tank; meanwhile, the control device controls the opening of the fifth electromagnetic valve so as to supplement water to the fire water tank through a tap water supplementing pipe.

The invention has the following advantages:

1. when the system works, the working mode of the system can be adjusted in real time according to the monitored temperature change of the cooling water, so that the temperature of the cooling water after heat exchange is reduced before the cooling water enters the transverse flow square cooling tower, the scaling problem of the transverse flow square cooling tower can be reduced, the heat exchange efficiency is improved, and the operation cost is reduced; meanwhile, water in the fire water tank can be in a flowing state, so that the scaling phenomenon of the wall surface and the bottom of the fire water tank can be effectively prevented, and the energy-saving function can be indirectly realized.

2. The dust removal system can remove dust and cool the air entering the cross-flow square cooling tower, so that the problem of scaling on a filler due to the fact that dust particles and the like enter the cross-flow square cooling tower can be prevented when the dust removal system is used specifically, and the loss of cooling water amount can be greatly reduced when moist air is used for heat exchange, so that the heat exchange efficiency of the cross-flow square cooling tower is improved, and the stability of the whole water cooling unit is improved.

3. During the in-service use, can carry out high-efficient heat transfer to the water chilling unit to ensure that the water chilling unit can high-efficient normal operation.

4. The rainwater resource that can make full use of collect carries out the moisturizing, can reduce the waste of water resource.

5. When a fire disaster happens, the fire-fighting water tank can be supplemented with water through a plurality of channels to ensure that the fire-fighting water tank has a sufficient water source, which is helpful for the smooth fire rescue work and reduces the harm caused by the fire disaster.

Drawings

The invention will be further described with reference to the following examples with reference to the accompanying drawings.

FIG. 1 is a schematic block diagram of a cross-flow square cooling tower device with dust removal and scale prevention functions according to the present invention.

FIG. 2 is a schematic view of the assembly of the dust extraction system of the present invention with a cross-flow square cooling tower.

Figure 3 is a block diagram of a filter in accordance with the present invention in use with a flusher.

Fig. 4 is a water replenishing flow chart of the waterproof case and the rainwater collection container according to the present invention.

FIG. 5 is a flow chart of the operation of the water chiller and the flusher of the present invention.

Description of reference numerals:

100-cross flow square cooling tower device, 1-cooling water system, 2-rainwater collection and purification system, 3-fire water tank system, 4-dust removal system, 5-control device, 6-temperature sensor, 7-water chiller, 11-cross flow square cooling tower, 12-spray water storage tank, 121-overflow drain pipe, 13-variable frequency spray water pump, 14-cooling water pump, 15-cooling tower return pipe, 151-first electromagnetic valve, 16-cooling tower water supply pipe, 161-second electromagnetic valve, 17-bypass pipe, 171-third electromagnetic valve, 18-water storage tank water outlet pipe, 19-water storage tank water outlet pipe, 21-rainwater collection container, 22-rainwater delivery pump, 23-second liquid level sensor, 24-overflow water pipe, 25-rainwater conveying pipe, 251-sixth electromagnetic valve, 26-rainwater return pipe, 31-fire water tank, 32-ejector, 33-fire-fighting pipe network, 34-tap water replenishing pipe, 341-fifth electromagnetic valve, 342-seventh electromagnetic valve, 35-first liquid level sensor, 36-fire water tank outlet pipe, 361-fourth electromagnetic valve, 41-filter, 42-flusher, 43-sprinkler, 44-filter residue pool and 45-water spraying area.

Detailed Description

Referring to fig. 1 to 3, a preferred embodiment of a cross-flow square cooling tower apparatus 100 with dust removal and scale prevention functions of the present invention includes a cooling water system 1, a rainwater collection and purification system 2, a fire water tank system 3, a dust removal system 4, a control device 5, a temperature sensor 6 and a water chiller 7;

the cooling water system 1 comprises a cross-flow square cooling tower 11, a spraying water storage tank 12, a variable-frequency spraying water pump 13 and a cooling water pump 14; the top of the cross-flow square cooling tower 11 is connected with the water outlet side of the water cooling unit 7 through a cooling tower water return pipe 15, a first electromagnetic valve 151 is arranged on the cooling tower water return pipe 15, and when the first electromagnetic valve 151 is opened, cooling water which exchanges heat from the water cooling unit 7 can be conveyed into the cross-flow square cooling tower 11 through the cooling tower water return pipe 15 for cooling; the bottom of the cross flow square cooling tower 11 is connected with the spray water storage tank 12 through a cooling tower water supply pipe 16, the cooling tower water supply pipe 16 is provided with a second electromagnetic valve 161, and when the second electromagnetic valve 161 is opened, cooling water passing through the cross flow square cooling tower 11 can be conveyed into the spray water storage tank 12; the cooling tower water return pipe 15 is connected with the cooling tower water supply pipe 16 through a bypass pipe 17, the bypass pipe 17 is provided with a third electromagnetic valve 171, and in implementation, if the first electromagnetic valve 151 and the second electromagnetic valve 161 are closed and the third electromagnetic valve 171 is opened, cooling water which exchanges heat from the water cooling unit 7 can be directly conveyed into the spraying water storage tank 12, under the working condition, the scaling problem caused by heat exchange of the cooling water through the cross-flow square cooling tower 11 can be fundamentally avoided, and the energy-saving function can be indirectly realized; the bottom of the spray water storage tank 12 is connected with the water inlet side of the water cooling unit 7 through a water storage tank outlet pipe 18, the cooling water pump 14 is arranged on the water storage tank outlet pipe 18, and when the spray water storage tank works, cooling water can be conveyed into the water cooling unit 7 through the cooling water pump 14 for cooling; the top of the cross flow square cooling tower 11 is also connected with the spraying water storage tank 12 through a secondary spraying pipe 19, the variable frequency spraying water pump 13 is arranged on the secondary spraying pipe 19, when the variable frequency spraying water pump 13 is started, cooling water in the spraying water storage tank 12 can be conveyed to the upper part of the cross flow square cooling tower 11 to be mixed with cooling water after heat exchange, so that the temperature of the cooling water entering the cross flow square cooling tower 11 is reduced, the lower the temperature of the cooling water is, the higher the scale inhibition rate of the cooling water is, and the lower the scale inhibition rate is correspondingly, which is beneficial to basically reducing the scale formation problem caused by the heat exchange of the cooling water through the cross flow square cooling tower 11.

The fire-fighting water tank system 3 comprises a fire-fighting water tank 31, an ejector 32, a fire-fighting pipe network 33, a tap water replenishing pipe 34 and a first liquid level sensor 35; the ejector 32 is arranged on the cooling tower water return pipe 15, the ejector 32 is used for ejecting fire-fighting water in the fire-fighting water tank 31 to be mixed with cooling water after heat exchange, and the first liquid level sensor 35 is arranged on the inner wall of the fire-fighting water tank 31 and used for detecting the liquid level of the fire-fighting water tank 31 in real time; the lower part of the fire water tank 31 is connected with the ejector 32 through a fire water tank outlet pipe 36, and the fire water tank outlet pipe 36 is provided with a fourth electromagnetic valve 361, so that fire water in the fire water tank 31 can be ejected out to be mixed with cooling water after heat exchange when the fourth electromagnetic valve 361 is opened; the fire-fighting pipe network 33 is connected with the bottom of the fire-fighting water tank 31, so that fire can be conveniently and timely started to extinguish when a fire breaks out; the upper part of the fire water tank 31 is connected with the tap water replenishing pipe 34, a fifth electromagnetic valve 341 is arranged at the position where the tap water replenishing pipe 34 is connected with the fire water tank 31, and when the fifth electromagnetic valve 341 is opened, a water source can be replenished into the fire water tank 31;

the dust removing system 4 comprises a filter 41, a flusher 42, a water sprayer 43 and a filter residue pool 44; the filter 41 is arranged outside the air inlet of the cross flow square cooling tower 11, the filter 41 can filter the air entering the cross flow square cooling tower 11 to prevent dust particles in the air from entering the cross flow square cooling tower 11, and a water spraying area 45 is formed between the filter 41 and the cross flow square cooling tower 11; the flusher 42 is arranged directly over the filter 41, the water sprayer 43 is arranged directly over the water spraying area 45, the filter residue pool 44 is arranged under the filter 41, wherein the flusher 42 can flush and remove dust from the filter 41, the water sprayer 43 can spray water to cool the entering air, and the filter residue pool 44 is used for filtering out impurities such as dust particles flushed from the filter 41.

The flusher 42, the sprinkler 43, the residue filtering tank 44 and the fire water tank 31 are all connected with the rainwater collecting and purifying system 2, when the system is implemented specifically, a water source can be supplemented to the fire water tank 31 through the rainwater collecting and purifying system 2, the flusher 42 and the sprinkler 43 can be supplied with water through the rainwater collecting and purifying system 2, and the flushing water and the sprayed water can be recovered after being filtered by the filter 41; the temperature sensor 6 is arranged on the cooling tower water return pipe 15 on the water outlet side of the water cooling unit 7, and the temperature sensor 6 is used in the rainwater collection and purification system 2; the first electromagnetic valve 151, the second electromagnetic valve 161, the third electromagnetic valve 171, the fourth electromagnetic valve 361, the fifth electromagnetic valve 341, the cross-flow square cooling tower 11, the variable-frequency spray water pump 13, the cooling water pump 14, the temperature sensor 6 and the first liquid level sensor 35 are all electrically connected with the control device 5.

The rainwater collection and purification system 2 comprises a rainwater collection container 21, a rainwater delivery pump 22 and a second liquid level sensor 23, wherein the second liquid level sensor 23 is arranged on the inner wall of the rainwater collection container 21; the upper part of the fire water tank 31 is connected with the rainwater collection container 21 through an overflow water pipe 24, and when the water quantity of the fire water tank 31 is excessive, the excessive water can be discharged into the rainwater collection container 21 through the overflow water pipe 24 so as to be conveniently used when needed; the lower part of the rainwater collection container 21 is respectively connected with the flusher 42 and the water sprayer 43 through a rainwater delivery pipe 25, the rainwater delivery pump 22 is arranged on the rainwater delivery pipe 25, a sixth electromagnetic valve 251 is arranged at the position where the rainwater delivery pipe 25 is connected with the flusher 42, and when the rainwater delivery pump 22 and the sixth electromagnetic valve 251 are opened, the water in the rainwater collection container 21 can be delivered to the flusher 42 for flushing and the water sprayer 43 for spraying water; the filter residue pool 44 is connected with the rainwater collection container 21 through a rainwater return pipe 26 and is used for recovering filtered water into the rainwater collection container 21; the upper part of the rainwater collection container 21 is connected with the tap water replenishing pipe 34, a seventh electromagnetic valve 342 is arranged at the position where the tap water replenishing pipe 34 is connected with the rainwater collection container 21, and when the seventh electromagnetic valve 342 is opened, the rainwater collection container 21 can be replenished through the tap water replenishing pipe 34; the rainwater delivery pump 22, the second liquid level sensor 23, the sixth electromagnetic valve 251 and the seventh electromagnetic valve 342 are all electrically connected with the control device 5.

Spray water storage tank 12 sets up the inside top of fire water tank 31, when concrete implementation, can fix spray water storage tank 12 on fire water tank 31's inner wall, the during operation, the fire-fighting water in the fire water tank 31 can contact the heat transfer with the wall of spraying water storage tank 12 to reduce the temperature of cooling water. An overflow drain pipe 121 is provided at the upper portion of the spray reservoir 12, and the overflow drain pipe 121 is provided at a position 5cm higher than the normal liquid level of the fire water tank 31, so that when the amount of water in the spray reservoir 12 is large, the excessive water can be discharged into the fire water tank 31 through the overflow drain pipe 121.

The water chiller 7 is disposed in a machine room (not shown), and the cross-flow square cooling tower 11, the rainwater collection container, the fire water tank 31 and the control device 5 are disposed on a roof (not shown).

The flusher 42 is provided with a plurality of flushing nozzles 421, and each flushing nozzle 421 faces the filter 41.

Referring to fig. 1, 4 and 5, a method for controlling a cross-flow square cooling tower with dust removal and scale prevention according to the present invention requires the cooling tower apparatus 100; the method comprises the following steps:

step 1, setting a high liquid level critical value Hx1 and a low liquid level critical value Hx2 of the fire water tank 31, dividing the water level state of the fire water tank 31 into a low water level state, a stable water level state and a high water level state, testing the actual liquid level value Hx in the fire water tank 31 in real time through a first liquid level sensor 35, comparing the Hx with Hx1 and Hx2 respectively, and supplementing or draining the fire water tank 31 according to the comparison result;

step 2, setting a high water level critical value Hy1 and a low water level critical value Hy2 of the rainwater collection container 21, testing the actual water level value Hy in the rainwater collection container 21 in real time through the second liquid level sensor 23, dividing the water level state of the rainwater collection container 21 into a low water level state, a stable water level state and a high water level state, comparing Hy with Hy1 and Hy2 respectively, and supplementing water or draining the rainwater collection container 21 according to the comparison result;

step 3, setting a high-load outlet water temperature critical value t1 and a low-load outlet water temperature critical value t2 of the water cooling unit 7, testing the outlet water temperature value t of the cooling water of the water cooling unit 7 in real time through the temperature sensor 6, comparing the t with t1 and t2 respectively, and controlling the cross-flow square cooling tower 11 to stop if the temperature sensor 6 continuously detects that t is less than t2, and cooling the cooling water only through heat exchange of the spraying water storage tank 12; if the temperature sensor 6 continuously detects that t is not less than t1 and is not less than t2, the water in the cross-flow square cooling tower 11 and the fire water tank 31 is started to carry out double cooling on the cooling water; if the temperature sensor 6 continuously detects that t is more than t1, the water in the cross flow square cooling tower 11 and the fire water tank 31 is started to carry out double cooling on the cooling water;

step 4, controlling the flusher 42 to clean and remove dust from the filter 41 according to the comparison result of t with t1 and t 2;

and step 5, controlling the spraying water storage tank 12 and the tap water replenishing pipe 34 to simultaneously replenish water to the fire water tank 31 through the control device 5 when a fire disaster occurs. Wherein, the first and the second end of the pipe are connected with each other,

referring to fig. 4, in the step 1, "comparing Hx with Hx1 and Hx2, respectively, and performing water replenishing or draining on the waterproof tank 31 according to the comparison result" specifically includes:

if the Hx is continuously measured by the first liquid level sensor 35 to be less than Hx2, it is determined that the fire water tank 31 needs to be refilled, that is, the fire water tank 31 is in a "low water level state", at this time, the fifth electromagnetic valve 341 is controlled to be opened by the control device 5, the fire water tank 31 is refilled by the tap water refilling pipe 34, and the fifth electromagnetic valve 341 is controlled to be closed by the control device 5 until Hx reaches Hx1 after refilling water, so as to finish refilling water;

if Hx > Hx1 is continuously detected by the first liquid level sensor 35, it indicates that the fire water tank 31 needs to be drained, i.e. the fire water tank 31 is in a "high water level state", at this time, the fifth electromagnetic valve 341 is controlled to be closed by the control device 5, the excess water in the fire water tank 31 is drained to the rainwater collection container 21 by the overflow pipe 24, and the drainage is not stopped until Hx reaches Hx 1;

if Hx2 is not less than Hx1, which is continuously measured by the first liquid level sensor 35, that is, the fire water tank 31 is in a "stable water level state", the fifth electromagnetic valve 341 is controlled to be closed by the control device 5, and water is not replenished or drained to the fire water tank 31.

For example, the high liquid level critical value of the fire water tank 31 is set to be 1.9m and the low liquid level critical value is set to be 1.6 m; at this time, if the first liquid level sensor 35 continuously detects that Hx is less than 1.6m, the control device 5 controls the tap water replenishing pipe 34 to replenish water to the waterproof box 31, and the water replenishing is stopped until Hx is 1.9 m; if the first liquid level sensor 35 continuously detects that Hx is greater than 1.9m, the control device 5 controls the overflow pipe 24 to discharge the excess water in the fire water tank 31 into the rainwater collection container 21, and the drainage is stopped until Hx is 1.9 m; if Hx is continuously measured by the first liquid level sensor 35 to be not less than 1.6m and not more than 1.9m, no water is drained and no water is added at this time.

In the step 2, the "comparing Hy with Hy1 and Hy2, respectively, and replenishing or draining the rainwater collection container 21 according to the comparison result" is specifically:

if the second liquid level sensor 23 continuously detects that Hy is less than Hy2, it indicates that the rainwater collection container 21 needs to be replenished, that is, the rainwater collection container 21 is in a "low water level state", at this time, the control device 5 controls the seventh electromagnetic valve 342 to open, the tap water replenishing pipe 34 replenishes water to the rainwater collection container 21, and until Hy reaches Hy1 after water replenishment, the control device 5 controls the seventh electromagnetic valve 342 to close, so as to finish water replenishment;

if the second liquid level sensor 23 continuously detects Hy > Hy1, it indicates that the rainwater collection container 21 needs to be drained, that is, the rainwater collection container 21 is in a "low water level state", at this time, the seventh electromagnetic valve 342 is controlled to be closed by the control device 5, excess water in the rainwater collection container 21 is drained to the fire water tank 31 through the overflow water pipe 24, and the drainage is not stopped until Hy reaches Hy 1;

if the second liquid level sensor 23 continuously measures Hy2 not less than Hy and not more than Hy1, that is, the rainwater collection container 21 is in a "stable water level state", the control device 5 controls the seventh electromagnetic valve 342 to close, and water is not supplemented and drained to the rainwater collection container 21.

For example, the rainwater collection container 21 is set to have a high water level threshold value of 1m and a low water level threshold value of 0.5 m; at this time, if the second level sensor 23 continuously detects that Hy is less than 0.5m, the control device 5 controls the seventh electromagnetic valve 342 to open, so as to replenish the rainwater collection container 21 by the tap water replenishing pipe 34, and stop replenishing until Hy is 1 m; if the second level sensor 23 continuously detects that Hy is greater than 1m, the control device 5 controls the seventh electromagnetic valve 342 to close, discharges the excess water in the rainwater collection container 21 to the fire water tank 31 through the overflow water pipe 24, and stops discharging the water until Hy is 1 m; if the second liquid level sensor 23 continuously detects that Hy is greater than or equal to 0.5m and less than or equal to 1m, no water is drained and no water is added at the moment.

Referring to fig. 5, the step 3 specifically includes:

the method comprises the following steps of setting a high-load outlet water temperature critical value t1 and a low-load outlet water temperature critical value t2 of a water-cooling unit 7, dividing the working state of the water-cooling unit 7 into a low-load working state, a middle-load working state and a high-load working state, testing the outlet water temperature value t of the water-cooling unit 7 in real time through a temperature sensor 6, comparing t with t1 and t2 respectively, and selecting one of the following three steps to execute according to the comparison result:

step A1, if the temperature sensor 6 continuously detects that t is less than t2, the system is in a low-load working state, namely the water-cooling unit 7 is in a low-load working state, and at the moment, the temperature sensor 6 sends a signal instruction to the control device 5; after receiving the signal instruction, the control device 5 controls the low-frequency operation of the cooling water pump 14, controls the first electromagnetic valve 151, the second electromagnetic valve 161 and the fourth electromagnetic valve 361 to be closed, controls the third electromagnetic valve 171 to be opened, and controls the cross-flow square cooling tower 11, the variable-frequency spray water pump 13 and the rainwater delivery pump 22 to be stopped;

the circulation of the cooling water at this time is as follows: under the low-frequency operation of the cooling water pump 14, cooling water in the spray water storage tank 12 enters the water chiller unit 7 for heat exchange, cooling water after heat exchange returns to the spray water storage tank 12 through the bypass pipe 17, meanwhile, fire-fighting water in the fire-fighting water tank 31 contacts with the wall surface of the spray water storage tank 12 for heat exchange, so that the temperature of the cooling water in the spray water storage tank 12 is reduced, and then the step 4 is carried out;

in this case, the cooling load of the water chiller 7 is low, and the amount of cooling water required is small, so that the cooling water pump 14 is operated at a low frequency. Meanwhile, under the working condition, the cooling water does not need to be cooled through the transverse flow square cooling tower 11, the scaling problem caused by the heat exchange of the cooling water through the transverse flow square cooling tower 11 can be essentially avoided, and the energy-saving function can be indirectly realized.

A2, if t2 is not less than t1 which is continuously measured by the temperature sensor 6, the system is in a medium-load working state, and at the moment, the temperature sensor 6 sends a signal instruction to the control device 5; after receiving the signal instruction, the control device 5 controls the intermediate frequency operation of the cooling water pump 14, controls the first electromagnetic valve 151, the second electromagnetic valve 161 and the fourth electromagnetic valve 361 to be opened, controls the third electromagnetic valve 171 to be closed, and simultaneously controls the cross flow square cooling tower 11 to work, controls the variable frequency spray water pump 13 to work at a low frequency and controls the rainwater delivery pump 22 to work at a low frequency;

the cooling water is circulated at this time as follows: under the medium-frequency operation of the cooling water pump 14, cooling water in the spray water storage tank 12 enters the water cooling unit 7 for heat exchange, and when flowing through the ejector 32, the cooling water after heat exchange is firstly mixed with fire-fighting water ejected from the fire-fighting water tank 31 for cooling; then when the cooling water flows through the top of the cross flow square cooling tower 11, the cooling water is mixed with the cooling water pumped by the variable frequency spray water pump 13 at a low frequency again for cooling, and meanwhile, the air enters the cross flow square cooling tower 11 after being filtered by the filter 41 and cooled by the water sprayed by the water sprayer 43; finally, cooling water enters the cross flow square cooling tower 11 for cooling, flows back to the spraying water storage tank 12 through a cooling tower water supply pipe 16, and then enters the step 4;

at this time, the cooling load of the water chiller 7 is high, and the amount of cooling water required is also large, so the cooling water pump 14 is operated at an intermediate frequency. Under this operating mode, the cooling water after the heat transfer can carry out dual cooling through the square cooling tower of crossing current 11 and the fire water tank 31's of fire-fighting water, and under the promotion of frequency conversion spray pump 13, can make the cooling water after the heat transfer mix the cooling again in the square cooling tower of crossing current 11 top, this helps reducing the temperature of the cooling water that gets into the square cooling tower of crossing current 11, and the cooling water temperature is lower, the scale inhibition rate of cooling water just is higher, the scale deposit rate is corresponding just lower, consequently can alleviate the scale deposit problem that produces because of the cooling water passes through the square cooling tower of crossing current 11 heat transfer in essence. Meanwhile, because the water in the fire water tank 31 is in a flowing state, the accumulation of impurities at the bottom of the fire water tank 31 can be avoided; secondly, under the shearing force of rivers, the incrustation scale is difficult for generating, can alleviate fire water tank 31 and lead to the incrustation scale to spread and wash inconvenient phenomenon because of long-term out of work in traditional building. In addition, the air entering the cross flow square cooling tower 11 can filter a large amount of dust in the air when passing through the filter 41; after passing through the water sprayer 43, the moisture content of the air is increased, and the humidity is nearly saturated, so that the loss of the cooling water quantity can be greatly reduced when the heat exchange is carried out with the cooling water; when the cooling water exchanges heat with the air which is subjected to dust removal and temperature reduction, the temperature of the cooling water after heat exchange can be reduced to be lower, and therefore the system efficiency is higher.

A3, if t is continuously measured by the temperature sensor 6 to be more than t1, the system is in a high-load working state, and at the moment, the temperature sensor 6 sends a signal instruction to the control device 5; after receiving the signal instruction, the control device 5 controls the cooling water pump 14 to operate at a high frequency, controls the first electromagnetic valve 151, the second electromagnetic valve 161 and the fourth electromagnetic valve 361 to be opened, controls the third electromagnetic valve 171 to be closed, and simultaneously controls the cross flow square cooling tower 11 to operate, controls the variable frequency spray water pump 13 to operate at a high frequency, and controls the rainwater delivery pump 22 to operate at a high frequency;

the cooling water is circulated at this time as follows: under the high-frequency operation of the cooling water pump 14, cooling water in the spray water storage tank 12 enters the water cooling unit 7 for rapid heat exchange, and the cooling water after heat exchange is mixed with fire-fighting water which is guided out from the fire-fighting water tank 31 for cooling when flowing through the ejector 32; then when the cooling water flows through the top of the cross flow square cooling tower 11, the cooling water is mixed with the cooling water pumped by the variable frequency spray water pump 13 at high frequency again for cooling, and meanwhile, the air enters the cross flow square cooling tower 11 after being filtered by the filter 41 and cooled by the water sprayed by the water sprayer 43; finally, cooling water enters the cross flow square cooling tower 11 for cooling and flows back to the spraying water storage tank 12 through a water supply pipe 16 of the cooling tower, and then the step 4 is carried out;

since the cooling load of the water chiller 7 is high and the amount of cooling water required is large, the cooling water pump 14 is operated at a high frequency. Under this operating mode, because cooling water pump 14 high frequency operation, so cooling water flow increases, and this can shorten the heat transfer time of cooling water and water chilling unit 7 to reduce the temperature behind the cooling water heat transfer, and because cooling water flow increases, consequently the flow of the fire water of jet out also increases, with the better cooling effect of realization. The cooling water after heat exchange can be cooled doubly through the cross flow square cooling tower 11 and the fire water tank 31, and under the lifting of the variable frequency spray pump 13, the cooling water after heat exchange can be mixed and cooled again above the cross flow square cooling tower 11, so that the temperature of the cooling water entering the cross flow square cooling tower 11 is reduced, the lower the temperature of the cooling water is, the higher the scale inhibition rate of the cooling water is, the lower the scale inhibition rate is correspondingly, and therefore the scaling problem caused by the heat exchange of the cooling water through the cross flow square cooling tower 11 can be substantially reduced. Meanwhile, at this time, since the water in the fire water tank 31 is in a fast flowing state, the accumulation of impurities at the bottom of the fire water tank 31 can be avoided; secondly, under the shearing force of rivers, the incrustation scale is difficult for generating, can alleviate fire water tank 31 and lead to the incrustation scale to spread and wash inconvenient phenomenon because of long-term out of work in traditional building. In addition, the air entering the cross flow square cooling tower 11 can filter a large amount of dust in the air when passing through the filter 41; after passing through the water sprayer 43, the moisture content of the air is increased, and the humidity is nearly saturated, so that the loss of the cooling water quantity can be greatly reduced when the heat exchange is carried out with the cooling water; when the cooling water exchanges heat with the air which is subjected to dust removal and temperature reduction, the temperature of the cooling water after heat exchange can be reduced to be lower, and therefore the system efficiency is higher.

For example, setting a high-load outlet water temperature critical value of 35 ℃ and a low-load outlet water temperature critical value of 30 ℃ of the water cooling unit 7;

at this time, if the temperature sensor 6 continuously detects that t is less than 30 ℃, the control device 5 controls the cooling water pump 14 to operate at a low frequency, controls the first electromagnetic valve 151, the second electromagnetic valve 161 and the fourth electromagnetic valve 361 to be closed, controls the third electromagnetic valve 171 to be opened, and controls the cross-flow square cooling tower 11, the variable-frequency spray water pump 13 and the rainwater delivery pump 22 to stop;

if t is more than or equal to 30 ℃ and less than or equal to 35 ℃ continuously measured by the temperature sensor 6, the control device 5 controls the cooling water pump 14 to operate at the intermediate frequency, controls the first electromagnetic valve 151, the second electromagnetic valve 161 and the fourth electromagnetic valve 361 to be opened, controls the third electromagnetic valve 171 to be closed, and simultaneously controls the cross-flow square cooling tower 11 to operate, controls the variable-frequency spray water pump 13 to operate at the low frequency and controls the rainwater delivery pump 22 to operate at the low frequency;

if t is continuously measured by the temperature sensor 6 to be more than 35 ℃, the control device 5 controls the cooling water pump 14 to operate at high frequency, controls the first electromagnetic valve 151, the second electromagnetic valve 161 and the fourth electromagnetic valve 361 to be opened, controls the third electromagnetic valve 171 to be closed, and simultaneously controls the cross flow square cooling tower 11 to operate, controls the variable frequency spray water pump 13 to operate at high frequency and controls the rainwater delivery pump 22 to operate at high frequency.

The step 4 specifically comprises the following steps:

in practice, the operating state of the flusher 42 can be divided into an "off state", a "low-frequency cleaning state" and a "high-frequency cleaning state".

If the temperature sensor 6 continuously detects that t is less than t2, namely the system is in a low-load working state, the control device 5 controls the sixth electromagnetic valve 251 to be closed, the cleaning and dust removing operation is not carried out, and the flusher 42 is in a closed state; if the temperature sensor 6 continuously measures that T is greater than or equal to T2 and less than or equal to T1, namely the system is in a medium-load working state, the control device 5 controls the sixth electromagnetic valve 251 to be intermittently opened by taking T1 as a period, the opening duration is 5 minutes, so that the filter 41 is cleaned and dedusted by the flusher 42, and at this time, the flusher 42 is in a low-frequency cleaning state; if the temperature sensor 6 continuously detects T > T1, that is, the system is in a high-load working state, the sixth electromagnetic valve 251 is controlled by the control device 5 to be opened intermittently at a period of T2 for 5 minutes, so as to perform the cleaning and dust removing operation on the filter 41 by the flusher 42, and at this time, the flusher 42 is in a "high-frequency cleaning state". Wherein, T1 and T2 can be set according to actual cleaning needs, and the opening duration time can be adjusted according to actual conditions.

For example, setting a high-load outlet water temperature critical value of 35 ℃ and a low-load outlet water temperature critical value of 30 ℃ of the water cooling unit 7; at this time, if the temperature sensor 6 continuously measures that t is less than 30 ℃, the control device 5 controls the sixth electromagnetic valve 251 to be closed, so that the flusher 42 is in a closed state; if the temperature sensor 6 continuously measures T is more than or equal to 30 ℃ and less than or equal to 35 ℃, the control device 5 controls the sixth electromagnetic valve 251 to be intermittently opened by taking T1 as a period of 8 seconds, and the opening duration is 5 minutes, even if the flusher 42 is in a low-frequency cleaning state; if the temperature sensor 6 continuously detects T > 35 ℃, the control device 5 controls the sixth electromagnetic valve 251 to be intermittently opened at a period of T2 ═ 6 seconds for 5 minutes even if the flusher 42 is in the "high-frequency washing state".

The step 5 specifically comprises the following steps:

when a fire disaster occurs, the control device 5 controls the cooling water pump 14 to run at a high frequency, controls the first electromagnetic valve 151, the second electromagnetic valve 161 and the fourth electromagnetic valve 361 to be closed, controls the third electromagnetic valve 171 to be opened, and controls the cross-flow square cooling tower 11 and the variable-frequency spray water pump 13 to be stopped, so that cooling water is quickly pumped to the spray water storage tank 12 through the cooling water pump 14, and water is supplemented to the fire water tank 31 through the overflow drain pipe 121 on the spray water storage tank 12; meanwhile, the fifth solenoid valve 341 is controlled to open by the control device 5 to replenish the water to the fire water tank 31 through the tap water replenishing pipe 34. Therefore, when a fire disaster occurs, sufficient water source of the fire-fighting pipe network 33 can be ensured through multi-channel water supplement, and the fire hazard is reduced.

In summary, the invention has the following beneficial effects:

Although specific embodiments of the invention have been described above, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the appended claims.

Claims

1. The utility model provides a square cooling tower device of crossing current with dust removal and scale control function which characterized in that: the cooling tower device comprises a cooling water system, a rainwater collecting and purifying system, a fire water tank system, a dust removing system, a control device, a temperature sensor and a water cooling unit;

the flusher, the water sprayer, the residue filtering pond and the fire water tank are all connected with the rainwater collecting and purifying system; the temperature sensor is arranged on the cooling tower water return pipe on the water outlet side of the water cooling unit; the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve, the fifth electromagnetic valve, the transverse flow square cooling tower, the variable-frequency spray water pump, the cooling water pump, the temperature sensor and the first liquid level sensor are all electrically connected with the control device;

the rainwater collection and purification system comprises a rainwater collection container, a rainwater delivery pump and a second liquid level sensor, and the second liquid level sensor is arranged on the inner wall of the rainwater collection container; the upper part of the fire water tank is connected with the rainwater collecting container through an overflow water pipe; the lower part of the rainwater collection container is respectively connected with the flusher and the water sprayer through a rainwater conveying pipe, the rainwater conveying pump is arranged on the rainwater conveying pipe, and a sixth electromagnetic valve is arranged at the position where the rainwater conveying pipe is connected with the flusher; the filter residue pool is connected with the rainwater collecting container through a rainwater return pipe; the upper part of the rainwater collecting container is connected with the tap water replenishing pipe, and a seventh electromagnetic valve is arranged at the position where the tap water replenishing pipe is connected with the rainwater collecting container; the rainwater delivery pump, the second liquid level sensor, the sixth electromagnetic valve and the seventh electromagnetic valve are all electrically connected with the control device;

the spraying water storage tank is arranged above the interior of the fire water tank; the upper part of the spraying water storage tank is provided with an overflow drain pipe which is arranged at a position 5cm higher than the normal liquid level of the fire water tank.

2. A cross flow square cooling tower apparatus with dust removal and scale prevention function according to claim 1, wherein: the water cooling unit is arranged in the machine room, and the cross-flow square cooling tower, the rainwater collecting container, the fire water tank and the control device are all arranged on the roof.

3. A cross flow square cooling tower apparatus with dust removal and scale prevention function according to claim 1, wherein: the flusher is provided with a plurality of flushing nozzles, and each flushing nozzle faces the filter.

4. A control method of a transverse flow square cooling tower device with dust removal and scale prevention functions is characterized in that: the method entails using the cooling tower apparatus of any of claims 1 to 3; the method comprises the following steps:

5. A method for controlling a cross flow square cooling tower device with dust removal and scale prevention functions according to claim 4, wherein:

in the step 1, "comparing Hx with Hx1 and Hx2, respectively, and replenishing or draining water to the waterproof tank according to the comparison result" specifically includes:

if the first liquid level sensor continuously detects that Hx is more than Hx1, the fire water tank needs to be drained, at the moment, the fifth electromagnetic valve is controlled to be closed through the control device, the overflow water pipe discharges redundant water in the fire water tank into the rainwater collection container, and the drainage is stopped until the Hx reaches Hx 1;

6. A method for controlling a cross flow square cooling tower device with dust removal and scale prevention functions according to claim 4, wherein: the step 3 specifically comprises the following steps:

7. A control method of a cross-flow square cooling tower device with dust removal and scale prevention functions as claimed in claim 4, wherein: the step 4 specifically comprises the following steps:

8. A method for controlling a cross flow square cooling tower device with dust removal and scale prevention functions according to claim 4, wherein: the step 5 specifically comprises the following steps:

when a fire disaster happens, the control device controls the cooling water pump to operate at high frequency, controls the first electromagnetic valve, the second electromagnetic valve and the fourth electromagnetic valve to be closed, controls the third electromagnetic valve to be opened, controls the cross-flow square cooling tower and the variable-frequency spray water pump to be stopped, so that cooling water is rapidly pumped to the spray water storage tank through the cooling water pump, and water is supplemented to the fire water tank through an overflow drain pipe on the spray water storage tank; meanwhile, the fifth electromagnetic valve is controlled to be opened through the control device, so that water is supplemented to the fire water tank through the tap water supplementing pipe.