CN210533166U - Thermal power plant natural draft cooling tower with last cleaning function - Google Patents
Thermal power plant natural draft cooling tower with last cleaning function Download PDFInfo
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- CN210533166U CN210533166U CN201921422179.4U CN201921422179U CN210533166U CN 210533166 U CN210533166 U CN 210533166U CN 201921422179 U CN201921422179 U CN 201921422179U CN 210533166 U CN210533166 U CN 210533166U
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Abstract
The utility model relates to a thermal power plant natural draft cooling tower with last cleaning function, including tower body, cistern, circulating water pump and condenser. The tower body is filled with a packing layer, and a spraying device is arranged above the packing layer; the water storage tank is arranged below the tower body, and water and cleaning media are added into the water storage tank; the circulating water pump pumps the circulating water and the cleaning medium in the reservoir to the condenser for heat exchange, and the circulating water of the condenser goes into a spray device of the cooling tower and is sprayed to the packing layer through the spray device; the solid particulate matter device causes the cleaning medium in the reservoir to be turbulent and suspended. Compared with the prior art, the cooling tower has a continuous filler cleaning function, wherein solid particulate matter particles are used as a cleaning medium, so that the cleaning effect is excellent; the suspension and sedimentation performance of solid particle particles are utilized to solve the problem of abrasion of the filler and the heat exchange tube of the condenser, and the safe and economic operation of the cooling tower is ensured.
Description
Technical Field
The utility model belongs to the technical field of heating power plant natural draft cooling tower and specifically relates to a heating power plant natural draft cooling tower with last cleaning function is related to.
Background
High-temperature and high-pressure steam generated by a boiler of a thermal power plant is discharged into a condenser after a steam turbine works, and circulating water in the condenser brings heat of the steam (waste steam) which cannot work continuously into a cooling tower and then is discharged into the atmosphere from the cooling tower. The cooled steam is condensed into water to complete a steam power cycle.
The exhaust pressure of the turbine determines the work capacity of the unit steam. The exhaust temperature of the steam turbine is equal to the saturated steam temperature corresponding to the exhaust pressure of the steam turbine, the lower the exhaust temperature is, the lower the corresponding exhaust pressure is, the greater the work capacity of unit steam is, and the higher the power generation efficiency of the steam turbine generator unit is. And the exhaust temperature is related to the outlet water temperature of the cooling tower, the circulating water temperature rise of the condenser and the end difference of the condenser. When the temperature rise of circulating water of the condenser and the end difference of the condenser are fixed, the exhaust temperature of the steam turbine and the outlet temperature of the cooling tower are in a direct proportion relation. The temperature of the outlet water of the cooling tower is reduced by 1 ℃, and the exhaust temperature of the steam turbine is simultaneously reduced by 1 ℃. According to statistics, the exhaust temperature of a 600MW unit is reduced by 1 ℃, and about 250 ten thousand yuan of coal for power generation is saved all the year round.
The cooling tower outlet water temperature is related to the unit load, the circulating water quantity, the atmospheric wet bulb temperature and the cooling tower performance. When the unit load, the amount of circulating water and the atmospheric wet bulb temperature are fixed, only the performance of the cooling tower is relevant. The greatest impact on cooling tower performance is the progressive deterioration of the cooling tower packing, the longer the cooling tower operating time, the more severe the cooling tower packing fouling. The dirt makes the air channel between the fillers smaller, the air quantity flowing through the fillers is reduced, the heat exchange performance of the cooling tower is poor, and the temperature of the water discharged from the tower is increased.
Because the cooling tower needs to evaporate a large amount of water to take away heat in work, circulating water is continuously concentrated, the concentrated circulating water can continuously scale on the surface of the filler when flowing through the filler, and the scale formation on the surface of the filler cannot be avoided even though scale inhibition and sterilization algicide are added into the circulating water.
Practice proves that the temperature of the outlet water of the cooling tower is reduced by about 2 ℃ by manually cleaning the cooling tower filler with more performance reduction. The performance of the cooling tower is improved, the power plant usually adopts a method of replacing the filler, the period is about 5 years, and the cost of replacing the filler of the cooling tower of the 600MW unit is about 400 million yuan. The design life of the filler is 20 years, and the service life of the filler is not less than 10 years.
In addition, the prior art also has a chemical and physical cleaning method:
the first method is that chemicals are added into the circulating water, the circulating water is continuously circulated in a cooling tower and a condenser, and the chemicals in the circulating water react with dirt on the filler to remove the dirt. The existing method does not consider the corrosion of the drugs in the circulating water to the cement components of the cooling tower. And the method is harmful to a large cement cooling tower. And chemicals are expensive. The use cost is high.
And the second method is that the filler is taken out and washed in an acid tank.
Both of the above methods have a problem of emission of pollutants.
And the third method is to take out the filler and wash the filler manually. The filler is taken out and cleaned by manual or chemical methods, and the filler can be damaged by disassembling and assembling the filler.
And the method IV is to clean the filler by using a high-pressure water gun, and the high-pressure water gun is not easy to clean due to the structural characteristics of the filler.
The restored properties of the filler cannot be maintained for a long time, whether it is replaced with a new one or the filler is physically and chemically cleaned. Mainly because the fouling process of the packing surface is progressive. Therefore, a method for continuously cleaning the cooling tower filler, namely a continuous cleaning technology of the cooling tower, is needed.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a thermal power plant natural draft cooling tower with last cleaning function in order to overcome the defect that above-mentioned prior art exists.
The utility model discloses still be applicable to the continuous washing of natural draft cooling tower among all kinds of closed recirculating cooling water systems such as chemical industry, steel simultaneously. And is also suitable for continuously cleaning mechanical ventilation cooling towers in various closed circulating cooling water systems in chemical industry, steel and the like.
The purpose of the utility model can be realized through the following technical scheme:
the utility model discloses well thermal power plant natural draft cooling tower that has and last cleaning function, including tower body, cistern, circulating water pump and condenser.
The tower body is filled with a packing layer, and a spraying device is arranged above the packing layer; the water storage tank is arranged below the tower body, water and cleaning media are added into the water storage tank, and a heat exchange air inlet communicated with the outside is arranged between the water storage tank and the tower body; the circulating water pump pumps water and cleaning media in the reservoir to the condenser for heat exchange, the circulating water of the condenser flows into a spray device of the cooling tower and is sprayed to the packing layer through the spray device, and finally the water and the cleaning media fall into the reservoir from the packing layer to form circulation; the solid particulate matter device causes the cleaning medium in the reservoir to be turbulent and suspended.
Further, the solid particulate matter device includes: a solid particle pump and a circulation pipeline. And the circulating pipeline is connected with the solid particle pump and circularly pumps the water in the reservoir and the cleaning medium, so that the cleaning medium is turbulent and suspended.
Further, the solid particulate matter device also comprises an annular flute-shaped pipe, the annular flute-shaped pipe is arranged at the bottom of the reservoir and is connected with the circulating pipeline, and the pumping water and the cleaning medium are sprayed out from the annular flute-shaped pipe.
Furthermore, the circulating pipeline comprises a water inlet pipe and a water outlet pipe; one end of the water outlet pipe is connected with an outlet of the solid particle pump, and the other end of the water outlet pipe is connected with the annular flute-shaped pipe; one end of the water inlet pipe is connected with an inlet of the solid particle pump, and the other end of the water inlet pipe is connected to the bottom of the water storage tank.
Furthermore, the annular flute-shaped pipe is provided with a jet hole facing the bottom of the reservoir. And flushing solid particle particles deposited at the bottom of the reservoir through an annular flute tube.
Furthermore, the spraying area of the spraying device can cover the upper surface of the packing layer, so that the packing layer can be cleaned by circulating cooling water containing solid particle particles.
Further, the cleaning medium is solid particulate matter.
Further, the density of the solid particulate matter particles is 1.5-4 g/cm3The particle size is less than or equal to 0.5 mm.
Further, the solid particulate matter is particulate matter of metal, nonmetal, inorganic compound, organic compound and solid mixture.
Solid particle particles are added into a reservoir as a cleaning medium, and the solid particle particles in the reservoir are swelled by a solid particle device, so that the solid particle particles are in turbulent suspension and flow along with circulating water;
continuously cleaning a cooling tower filler and a condenser under the action of circulating water and solid particulate matter particles;
the suspension degree of the solid particle particles in the reservoir is dynamically controlled by starting and stopping the solid particle pump and controlling the running time of the solid particle pump, so that the concentration of the solid particle particles in the circulating water is controlled.
Further, the density of the solid particulate matter particles is 1.5-4 g/cm3The particle size is less than or equal to 0.5mm, and the concentration of the solid particulate matter particles in water is less than or equal to 1500 mg/L.
Furthermore, the cleaning technology is not only suitable for the natural ventilation cooling tower of a thermal power plant, but also suitable for continuous cleaning of the natural ventilation cooling tower in various closed circulating cooling water systems of chemical engineering, steel and the like. And is also suitable for continuously cleaning mechanical ventilation cooling towers in various closed circulating cooling water systems in chemical industry, steel and the like.
Further, the solid particles have a flocculation effect in the water body. In the poplar seed season, the solid particle particles in the circulating water can make the poplar seed suspended in the circulating water and attached to the filler of the cooling tower wrap the solid particles and precipitate together with the solid particle particles, so that the poplar seed is convenient to remove.
The principle of the utility model is as follows:
solid particle particles are added into circulating water and continuously circulate in a closed circulating water system consisting of a cooling tower and a condenser, the circulating water containing the solid particles can clean the surface of a filler and the inner surface of a heat exchange tube of the condenser when flowing through the filler, and the formation of dirt on the surface of the filler and the inner wall of the heat exchange tube of the condenser is continuously prevented. As the solid particles do Brownian motion (namely irregular motion) in the circulating water, the boundary layer of the inner wall of the heat exchange pipe of the condenser is damaged, and the heat exchange of the condenser is enhanced.
Circulating water containing solid particle particles continuously runs in a closed circulating water system, and not only is the cleaning of the filler of a cooling tower and the inner wall of a heat exchange pipe of a condenser, but also the wear of the filler of the cooling tower and the pipe of the condenser can be caused. In order to solve the problem, the utility model discloses utilized solid particle density different with the particle diameter, the suspension and the different characteristics of settlement performance, the solid particle who chooses for use has good suspension performance and settlement performance, can satisfy simultaneously to the cooling tower filler and condenser heat transfer pipe inner wall scale removal and the requirement that the cooling tower filler and condenser heat transfer pipe inner wall do not wear and tear that hinders dirt and just.
After the descaling effect is achieved, the solid particles deposited in the water pool of the cooling tower are pumped out by a submersible pump by utilizing the sedimentation characteristic of the solid particles when the unit is stopped. Or cleaning the cooling tower water pool when the unit is repaired for a short time. After cleaning, a smaller level of solid particles is added to the circulating water. And (4) carrying out continuous scale inhibition operation on the cooling tower filler and the condenser.
The cleaning effect on the filler and the condenser and the abrasion observation on the filler and the condenser can be regularly carried out. Because the suspension property and the settleability of the solid particles are both good. Therefore, the particle size of the solid particles and the concentration of the solid particles in the circulating water can be conveniently adjusted at any time.
When the cooling tower is not in use, the concentration of the solid particles in the circulating water can be statically adjusted, and the solid particles can be added or reduced by utilizing the settleability of the solid particles.
The utility model discloses set up solid particle device, the suspension and the settlement performance of make full use of solid particle are with opening the dynamic solid particle concentration that stops solid particle pump and solid particle device operating duration and control the circulating water, guarantee to pack when guaranteeing to wash and hinder the dirt effect and the condenser is not worn and torn.
Compared with the prior art, the utility model has the advantages of it is following:
1) the cooling tower in the utility model has a continuous filler cleaning function, wherein solid particulate matter particles are used as cleaning media, and the cleaning effect is determined; the problem of abrasion is solved by skillfully utilizing the suspension and sedimentation performance of solid particle particles, so that the filler of the cooling tower is continuously cleaned into controllable cleaning, and the safe and economic operation of the cooling tower and the condenser is ensured.
2) The utility model provides a cooling tower opens through opening of solid particle pump and stops can realize lasting washing and the intermittent type of packing and wash, and the granularity of cleaning medium can convenient adjustment, and the solid particle concentration in the circulating water can static adjustment, again can dynamic adjustment.
3) Solid particle particles are used as crystal nucleuses, calcium and magnesium ions, salts, fungi and algae can grow on the solid particle particles in circulating water with high concentration ratio, the solid particle particles of circulating water of the cooling water tower are periodically updated by using the settleability of the solid particle particles, substances in the circulating water can be effectively removed, the service life of the cooling tower is prolonged, and meanwhile, the sewage of the cooling tower is reduced.
4) The utility model provides a suspension and the settlement performance of cooling tower make full use of solid particle thing particle, come the solid particle concentration of dynamic control circulating water through opening solid particle pump, solid particle pump operating duration, guarantee when guaranteeing the cleaning performance that filler and condenser are not worn and torn.
5) Not only has clean effect to the filler, carries out lasting clean to condenser and cooling tower body inside and utilize the heat exchanger in the open cooling water system of circulating water as cooling water simultaneously.
Drawings
FIG. 1 is a schematic structural diagram of a cooling tower according to the present invention;
fig. 2 is a schematic structural view of a middle-annular flute pipe of the present invention.
In the figure: 1. the device comprises a tower body, 2, a condenser, 3, a spraying device, 4, a packing layer, 5, a solid particle pump water outlet pipe, 6, a solid particle pump, 7, a circulating water pump, 8, a reservoir, 9, a solid particle pump water inlet pipe, 10, an annular flute-shaped pipe, 11 and a heat exchange air inlet.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Examples
The utility model discloses in have thermal power plant natural draft cooling tower who lasts cleaning function, including tower body 1, cistern 8, circulating water pump 7 and condenser 2.
A packing layer 4 is filled in the tower body 1, and a spraying device 3 is arranged above the packing layer 4; the water storage tank 8 is arranged below the tower body 1, water and cleaning media are added into the water storage tank 8, and a heat exchange air inlet 11 communicated with the outside is arranged between the water storage tank 8 and the tower body 1; the circulating water pump 7 pumps water and cleaning media in the reservoir 8 to the condenser 2 for heat exchange, circulating water of the condenser enters the spraying device 3 and is sprayed to the packing layer 4 through the spraying device 3, and finally the water and the cleaning media fall into the reservoir 8 from the packing layer 4 to form circulation; the solid particulate matter device causes the cleaning medium in the reservoir 8 to be turbulent and suspended. The spraying area of the spraying device can cover the upper surface of the packing layer, so that the packing layer can be cleaned by the mixed liquid containing solid particle particles.
Solid particulate matter device part: including the solid particulate pump 6 and the circulation line. The circulation line is connected to a solids pump 6 for circulating the water and the cleaning medium in the reservoir 8, so that the cleaning medium is turbulent and suspended. The solid particle device also comprises an annular flute type pipe 10, the annular flute type pipe 10 is arranged at the bottom of the reservoir 8 and is connected with the circulating pipeline, and the pumping water and the cleaning medium are sprayed out by the annular flute type pipe 10. The circulating pipeline comprises a water outlet pipe 5 and a water inlet pipe 9; one end of the water outlet pipe 5 is connected with an outlet of the solid particle pump 6, and the other end of the water outlet pipe is connected with the annular flute-shaped pipe 10; one end of the water inlet pipe 9 is connected with the inlet of the solid particle pump 6, and the other end is connected with the bottom of the reservoir 8. The annular flute-shaped pipe 10 is provided with a jet hole facing the bottom of the reservoir 8. And flushing solid particle particles deposited at the bottom of the reservoir through an annular flute tube.
Cleaning medium aspect: is solid particulate matter particles. The density of the solid particulate particles is 1.5-4 g/cm3The particle size is less than or equal to 0.5 mm. The concentration of the solid particulate matter particles in water is less than or equal to 1500 mg/L.
Under the same density, the larger the particles, the better the cleaning effect, the better the sedimentation performance, and the smaller the particles, the better the suspension performance.
As can be seen from m ═ ρ × V, the larger the density per unit volume, the larger the mass m. According to newton's second law, the larger the mass m and the larger the acceleration a, the larger the inertial force F. The cleaning effect of the water flow containing the solid particulate matters on the surface of the object is determined.
The solid particle particles have the functions of descaling and inhibiting scale on the cooling tower filler. The cooling tower is filled with scale, and large-grade solid particle particles are used, and the solid particles have good scale removal capability under the granularity. After the cooling tower filler is replaced or a new cooling tower or the filler is descaled, the solid particle particles with the smaller size are used for inhibiting scale.
The utility model discloses in above-mentioned thermal power plant natural draft cooling tower's cleaning method does:
solid particle particles are used as cleaning media and added into a reservoir 8, and the solid particle particles in the reservoir are raised through a solid particle device, so that the solid particles are in turbulent suspension and flow along with circulating water; continuously cleaning the cooling tower filler and the condenser heat exchange tube under the action of circulating water and solid particles; the suspension degree of the solid particles in the reservoir is dynamically controlled by starting and stopping the solid particle pump and controlling the running time of the solid particle pump, so that the concentration of the solid particles in the circulating water is controlled.
The utility model discloses in concrete use:
1. when the 600MW unit of in-service use, change cooling tower packing expense 400 more than ten thousand once, the performance can only maintain about 1 year, through the utility model discloses what is showing saves the expense.
2. In the prior art, the filler is physically cleaned, and is washed by a water gun at the bottom of a cooling tower when the machine is stopped, so that the position is poor, the washing is insufficient, the cleaning effect is poor, and the filler can be damaged by water of a high-pressure water gun; all the fillers are taken out of the cooling tower for cleaning, and the fillers are damaged in the processes of disassembly, assembly and cleaning. This technical scheme adopts and comes the solid particle concentration of dynamic control circulating water through opening solid particle pump, solid particle pump operating duration, guarantees filler and condenser not worn and torn when guaranteeing the cleaning performance.
3. During chemical cleaning in the prior art, add the medicine in the circulating water, start circulating water pump, carry out the circulating water circulation, monitor the corruption to the condenser pipe again, but the corruption to cooling tower cement component can not avoid, and the waste liquid after the washing simultaneously has the emission problem. In the technical scheme, the cleaning medium is a mixture of solid particulate matter particles and water, is an inorganic substance and has no pollution.
4. After the filler is fully cleaned, the outlet water temperature of the cooling tower can be reduced by 2 ℃, so that the service life of the cooling tower is prolonged by more than 15 years, and the coal can be saved by 500 ten thousand yuan for a 600MW unit per year.
The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention according to the disclosure of the present invention.
Claims (8)
1. The utility model provides a thermal power plant natural draft cooling tower with last cleaning function which characterized in that includes:
the tower body (1) is filled with a packing layer (4), and a spraying device (3) is arranged above the packing layer (4);
a condenser (2);
the water storage tank (8) is arranged below the tower body (1), water and cleaning media are added into the water storage tank, and a heat exchange air inlet (11) communicated with the outside is arranged between the water storage tank (8) and the tower body (1);
the circulating water pump (7) pumps water and cleaning media in the reservoir (8) to the condenser (2) for heat exchange, the circulating water of the condenser enters the spray device (3) of the cooling tower and is sprayed to the packing layer (4) through the spray device (3), and finally the water and the cleaning media fall into the reservoir (8) through the packing layer (4) to form circulation;
a solid particulate matter device, which makes the cleaning medium in the reservoir (8) turbulent and suspended.
2. A thermal power plant natural draft cooling tower with continuous cleaning function as claimed in claim 1, wherein said solid particulate matter device comprises:
a solid particle pump (6);
and the circulating pipeline is connected with the solid particle pump (6) and circularly pumps the water in the reservoir (8) and the cleaning medium, so that the cleaning medium is turbulent and suspended.
3. The thermal power plant natural draft cooling tower with continuous cleaning function of claim 1, wherein said solid particulate matter device further comprises a pipe (10) with a ring flute, said pipe (10) with a ring flute is installed at the bottom of the reservoir (8) and connected with the circulation pipeline, the pumped water and cleaning medium are sprayed out from the pipe (10) with a ring flute.
4. A thermal power plant natural draft cooling tower with continuous cleaning function according to claim 3, wherein said circulation line comprises an outlet pipe (5) and an inlet pipe (9);
one end of the water outlet pipe (5) is connected with an outlet of the solid particle pump (6), and the other end of the water outlet pipe is connected with the annular flute-shaped pipe (10);
one end of the water inlet pipe (9) is connected with an inlet of the solid particle pump (6), and the other end of the water inlet pipe is connected to the bottom of the water storage tank (8).
5. A natural draft cooling tower of a thermal power plant with continuous cleaning function as claimed in claim 3, wherein said annular flute-shaped tube (10) is provided with a jet hole facing the bottom of the reservoir (8).
6. A thermal power plant natural draft cooling tower with continuous cleaning as claimed in claim 1, wherein said cleaning medium is solid particulate matter.
7. A thermal power plant natural draft cooling tower with continuous cleaning function as in claim 6, wherein the density of said solid particulate matter particles is 1.5-4 g/cm3The particle size is less than or equal to 0.5 mm.
8. A thermal power plant natural draft cooling tower with continuous cleaning function as claimed in claim 7, wherein the solid particulate matter particles can be: particulate particles of metals, metalloids, inorganic compounds, organic compounds, solid state mixtures.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921422179.4U CN210533166U (en) | 2019-08-29 | 2019-08-29 | Thermal power plant natural draft cooling tower with last cleaning function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921422179.4U CN210533166U (en) | 2019-08-29 | 2019-08-29 | Thermal power plant natural draft cooling tower with last cleaning function |
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| CN210533166U true CN210533166U (en) | 2020-05-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110411272A (en) * | 2019-08-29 | 2019-11-05 | 高晋柏 | There are the Thermal Power Station's cooling stack and cleaning method of lasting cleaning function |
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2019
- 2019-08-29 CN CN201921422179.4U patent/CN210533166U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110411272A (en) * | 2019-08-29 | 2019-11-05 | 高晋柏 | There are the Thermal Power Station's cooling stack and cleaning method of lasting cleaning function |
| CN110411272B (en) * | 2019-08-29 | 2024-06-04 | 高晋柏 | Natural ventilation cooling tower with continuous cleaning function for thermal power plant and cleaning method |
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