CN1740726A

CN1740726A - Fast spraying freezing coldproof method

Info

Publication number: CN1740726A
Application number: CN 200510085723
Authority: CN
Inventors: 张富华
Original assignee: Individual
Current assignee: Zhang Fuhua
Priority date: 2005-03-18
Filing date: 2005-07-26
Publication date: 2006-03-01
Anticipated expiration: 2025-07-26
Also published as: CN100356127C

Abstract

The air inlet of lower portion of cooling tower is enclosed and baffled by using metal screen, the outer side of said metal screen is equipped with a circle of water pipeline, on the water pipeline several branch water pipes are set, every branch water pipe is equipped with a water nozzle, the main water pipeline is connected to the water pool of tower bottom, in the pipeline connected with water pipe and water pool a water pump and a temperature control device are mounted, the temperature control device includes temperature controller, temperature sensor and AC contactor connected on the water pump and motor loop, the sensor can be used for detecting water temperature in the water pool and setting upper limit and lower limit of temperature controller action.

Description

Fast spraying freezing coldproof method

One, technical field

The invention belongs to cooling tower winter protection technology, be specifically related to the method for the air inlet winter protection in winter of double-curve cooling column bottom.

Two, background technology

The cooling tower in power plant when temperature reaches below-10 ℃ in the winter time, promptly enters the winter operation phase, for preventing the generation freeze injury of cooling tower system, will take the freeze prevention measure in winter to the air inlet of tower bottom.Concrete way is at present: hang deep bead; Increase the outer ring water distribution of liquid distribution; The artificial ice etc. of beating.Above method is very dumb, wastes time and energy, and heat insulation effect is poor, is difficult to guarantee the cooling effect of cooling tower.Because winter temperature comes and go, the temperature difference is bigger, the artificial frequent deep bead of adjusting is difficult to accomplish; Temperature self can not be regulated and control the intake skewness around the temperature of cooling water and the liquid distribution; Manually play the restriction that ice is subjected to condition.Because freeze prevention measure is improper icing the bearing significantly in liquid distribution place overloaded, packing and backbar take place even collapse, ventilator is subjected to the destruction of serious freeze thawing, causes ventilator nature draft deficiency, make cooling tower summer can not the tape splicing full load, do not reach the purpose of natural cooling water.After cooling tower is out of service, because of the deep bead bad sealing, cold air flows in tower, because the infiltration of steam, the frost-heave force that the back that freezes produces is given badly damaged that cooling tower ventilator and liquid distribution cause, reduced the service life of cooling tower, increased maintenance cost, influenced the cooling effect of cooling tower, enterprise's cost of electricity-generating is risen.

Three, summary of the invention

The purpose of this invention is to provide a kind of fast spraying freezing coldproof method, can control the intake of cooling tower air inlet automatically, adjust the temperature in liquid distribution zone, satisfy the optimum temperature of cooling water needs, alleviate cooling tower and produce the heavy damage of freezing and being caused because of cold, no matter how natural temperature changes, can both adjust intake by the design temperature scope, realize the operation automation.

The technical solution used in the present invention is: to cooling tower bottom air inlet, carry out enclosing with wire netting, in wire netting arranged outside one all water lines, a plurality of minutes branching pipes are arranged on the water lines, on each minute branching pipe (operating) water nozzle is arranged.The water main road passes to pond at the bottom of the tower, in water main and pipeline that the pond is connected, is connected to water pump and temperature control equipment.Temperature control equipment comprises temperature controller, temperature sensor and is connected A.C. contactor on the pump motor loop, by the water temperature in the sensor detection pond, and preestablish the lower limit and the upper limit of water temperature, when water temperature is lower than down in limited time, the temperature controller action, switch by A.C. contactor connection pump motor makes pump working; Prescribe a time limit when water temperature is higher than, water pump cuts out automatically, quits work; Temperature controller starts according to range of set temperature and switches off the pump, and promptly it can and stop water spray according to variations in temperature control unlatching.During starting mode of pump, nozzle is evenly sprayed water on wire netting, and nozzle is very thin, and the water of ejection nebulizes, and water smoke contacts with wire netting and promptly freezes fast, and the enclosing of ice wall makes the intake minimizing, and the liquid distribution regional temperature raises.Along with the variation of temperature and thermic load, the ice face on the wire netting can slowly melt from the mesh center, and hole amplifies, and intake increases, and the trickle regional temperature drops to be set down in limited time, and water pump is restarted, and circulation is regulated.

The present invention is simple in structure, uses manpower and material resources sparingly, and can be incubated, can lower the temperature, safe and efficient, practical flexibly, with combine together naturally, can regulate the intake of air inlet automatically, do not freezed in the liquid distribution zone, coolant water temperature is controlled in the desirable scope, alleviate the harm of expanding and causing for tower tube and water spray system because of freezing after the moisture attacks, slow down the damaged speed of cooling tower, prolong the service life of time between overhauls(TBO) and tower, make cooling tower reach due efficient.Both can solve the freeze injury of cooling tower, and help economical operation again, and realize cooling tower province coal, power saving, the purpose of energy savings, reduction cost of electricity-generating will play important effect to improving economic benefit of enterprises.

Four, description of drawings

Fig. 1 is provided with schematic diagram for water main of the present invention road and water pump;

Fig. 2 is wire netting of the present invention and spraying system schematic diagram;

Fig. 3 for segmentation water pipe of the present invention and each minute branching pipe connection diagram;

Fig. 4 is the schematic diagram that is provided with of pump house;

Fig. 5 is vertical view of pump house.

Five, the specific embodiment

At cooling tower 1 air inlet place, the inclined strut outside, the employing mesh is that the wire netting 2 of 30 * 30mm～200 * 200mm carries out enclosing, and the rigidity ring beam of inclined strut and tower tube bottom adopts the anti-plastic sheeting that freezes anti-infiltration to paste, and preventing to spray water to freeze works the mischief.Control for ease of hydraulic pressure, 3 inboards, water main road are provided with

segmentation water pipe

4,4 one weeks of segmentation water pipe are divided into four sections, separate with flange dividing plate 5 between each section, every section has two regulation and control water valves 6, and every water pump 7 supplies water for two sections pipelines, according to the gross area design branch branching pipe 8 at air inlet place and the quantity of water spout 9, each minute, branching pipe 8 usefulness connecting plates 10 linked together, to guarantee the steadiness of facility.Select the size of caliber and the water pump 7 of coupling according to total discharge and required lift.Water pump 7 is located in the pump house 11, is provided with heating system 12 and distribution board 13 in the pump house 11, and in the pond that the inlet tube 14 of water pump 7 and temperature sensor are placed in cooling tower, temperature sensor is connected to distribution board 13 through temperature control circuit 15.Attemperating unit adopts XMT-102 type digital display adjusting apparatus, set water temperature upper and lower bound (being as the criterion so that the packing place is icing).The running water that starts water pump derives from the tank of cooling tower, supplies with through heating pipeline 17.Hot water in the tank in the tower is introduced in the pump house 11, inlet tube by the water pump of flowing through behind heating system 12 distribute heats pours in down a chimney mouth 18, enter the pump housing through pouring in down a chimney mouth 18, fill the entrance pipe 14 of water pump, make below the below water surface that circulates in inlet tube of entrance pipe 14 water.Pour in down a chimney mouthful 18 belows and be provided with reservation distributive pipe 19, superfluous water flows out to be guided in the pond.Set out mouth of a river branched pipe, guarantee that the water of inlet tube is in flow regime, the needs when satisfying starting mode of pump.

Evidence: the water smoke crystallization process of nozzle ejection is: spread over a whole area from one point, by coalescent to the center of mesh, form the ice face all around.When natural temperature is relative with temperature difference in the tower hour, required intake is more, and it is just big to form ice face hole; When temperature difference was big, required intake was less, and the ice face hole of formation is just little, and this is the certainty that self regulates intake.When the cooling tower need are out of service, answer manually-operated, form imperforate ice wall, stop cold air to enter in the tower, make the air in the cooling tower no longer mobile, the freeze injury that alleviates cooling tower.After water pump stopped automatically, the water in the pipeline should be discharged in the pond immediately, prevents to freeze.

Claims

1, a kind of fast spraying freezing coldproof method, it is characterized in that: to cooling tower (1) bottom air inlet, carry out enclosing, in wire netting (2) arranged outside one all water lines with wire netting (2), a plurality of minutes branching pipes (8) are arranged on the water lines, (operating) water nozzle (9) is arranged on each minute branching pipe (8); Water main road (3) passes to pond at the bottom of the tower, in water main (3) and pipeline that the pond is connected, is connected to water pump (7) and temperature control equipment; Temperature control equipment comprises temperature controller, temperature sensor and is connected A.C. contactor on the pump motor loop, detects water temperature in the pond by sensor, and preestablishes the water temperature lower limit and the upper limit that makes the temperature controller action.

2, fast spraying freezing coldproof method according to claim 1 is characterized in that: the screening area of wire netting (2) is 30 * 30mm～200 * 200mm.

3, fast spraying freezing coldproof method according to claim 1, it is characterized in that: inboard, water main road (3) is provided with segmentation water pipe (4), (4) one weeks of segmentation water pipe are divided into four sections, separate with flange dividing plate (5) between each section, every section has two regulation and control water valves (6), and every water pump (7) supplies water for two sections pipelines.