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Application of condenser ball cleaning technology in waste h

Shangdong Pingyin Shanhui Cement Co., Ltd has two new 5000t/d dry cement clinker production lines. The temperature of the preheater outlets of the two kilns is relatively low, of which 305 centigrade is the No.1 kilnand 295 centigrade is the No. 2 kiln. In order to make full use of the residual heat of waste gas discharged from the cement kiln production process, the author entrusted Dalian Yi Shida to build a 18 MW superheat power station for its supporting facilities in 2007. The waste heat power station was connected to the grid for power generation in November 2007, and passed the performance appraisal in December 2007. However, by March 2008, the power generation was gradually reduced, and the average power generation was reduced to 14,000-15000 KW. At this time, the boiler was operating normally and the kiln condition stable, but found that the vacuum of the condenser has a large change, from the original -0.092-0.90 MPa to 0.086-0.88MPa; the end difference from the original 6 centigrade-8 centigrade rose to 11 centigrade -13 centigrade, it shows that the cooling effect of the condenser is reduced.
It is believed that the water volume is reduced and the thermal resistance is increased due to the fouling of the heat exchange tube bundle. It is decided to pickle the condenser by pickling. After the pickling of the condenser in June, 2008, the dirt in the heat exchange tube bundle was removed and the resistance decreased. The cooling effect of the condenser was obviously improved, the vacuum was increased to -0.094-0.92MPa, the terminal difference was reduced to 5 centigrade to 7 centigrade, and the power generation capacity was 15200-16200KW, with an average increase of 1200KW. Considering that pickling can only be carried out regularly, the cycle is long, and it cannot be processed every day. For this reason, in August 2008, a set of condenser rubber ball cleaning devices was installed. Open the rubber ball cleaning device once a day, the effect is basically the same as pickling.

1. Rubber Ball Cleaning Technology

The rubber ball cleaning technology was invented by the former West German Tabunog in the early 1950s, and then China began its own research and development. At present, the design and equipment performance of rubber ball cleaning devices in China are close to the world advanced level.
The rubber ball cleaning system consists of a secondary filter screen, a ball collecting net, a ball loading chamber, a rubber ball pump, a manifold, a valve line and an electrical control device. Select the appropriate sponge rubber ball, the wet diameter of the ball is slightly larger than the inner diameter of the cooling pipe (about 1-2mm), and the wet specific gravity is close to the water. The rubber ball is put into the loading chamber, and the quantity is the condenser inlet. About 15% of the number of copper tubes, the ball-filling chamber is sealed, and then the rubber ball pump is activated to open the disc valve at both ends of the system. The rubber is squeezed through the cooling tube under the action of the pressure difference between the inlet and outlet of the circulating water. The inner diameter of the cooling pipe is wiped once, so that the dirt on the inner wall of the pipe is taken out with the water flow. The rubber ball enters the collecting net with the circulating water through the outlet pipe. Under the blockage of the collecting net plate, the rubber ball is separated and extracted by the rubber ball pump. Returning to the ball loading chamber, the cycle returns to the continuous cooling of the condenser cooling tube. After cleaning for about 3 hours, operate the funnel in the loading chamber to return to the position, and after 3 to 5 minutes, the ball can be collected.

2. Rubber ball cleaning device components

1 secondary filter:

secondary filter is the main equipment for circulating cooling water purification. It removes all the impurities larger than 6mm, ensures the normal operation of the condenser circulating water system, and plays a key to ensuring the normal operation of the rubber ball cleaning system. Effect, for power plants with a clean circulating water quality, it is no longer necessary to install a secondary filter.
The Idpe type secondary filter is composed by a motor, a reducer, a rotating shaft, a large sprocket, a pinion, a filter core, a casing and the like.
The circulating water enter the filter screen from the inlet, and the dirt larger than 6 mm is pressed on the periphery of the filter cylinder to start the rotation of the motor core. When the dirt passes through the collecting tank, it is blocked by the scraping plate, and the drain valve is opened, and the pressure water is from. The core is backwashed outside the core, and the dirt is discharged out of the screen with the water. The secondary filter is an upgraded product of WE type, PE type, EDF type and HF type filter.

2 collecting net:

collecting net is the key equipment in the rubber ball cleaning system. It is installed on the outside pipe section of the condenser. Its function is to separate the rubber ball from the cooling water, and it must have no leakage or the performance of the card, the ball is recycled and then taken out from the receiving net by the take-up tube to return to the ball-loading room.
The ball-receiving net produced now is the most advance structural form at present, and its grid plate can be rotated; when the rubber ball device is put into operation, the stencil is in the receiving position, and when the cleaning device is not put into operation, the grid plate can be rotate to a position consistent with the direction of water flow; both reduce water resistance and remove debris from the grid.

3 ball loading chamber:

the ball loading chamber is a device for putting balls, taking balls, storing and observing the rubber ball circulation in the rubber ball cleaning device; it is composed of a casing, a funnel, a switching valve etc. and is equipped with an observation window and gas, water discharge electromagnetic valve etc.

 4 rubber ball pump:

it is the power equipment for the rubber ball to continuously circulate in the rubber ball cleaning system. The pump is a special barrier-free centrifugal pump whose impeller consists of two blades forming a tubular passage, which has the advantages of no ball blocking, no ball cutting and small wear on the rubber ball.
5 Divider: The splitter is a three-way (tube) valve. By switching the guide plates therein, the ball can be put into the condenser on the side to be cleaned. It can also used as a conveying tee for the converging ball of the ball and the diverting pipe of the ball.

3. Installation instructions and precautions

Before the rubber ball cleaning device is put into operation, the hard dirt of the condenser water chamber and the inner wall of the cooling pipe is first cleaned, and the cracks and inner chamber deformation of the cooling plate should be replaced one by one, so that the rubber ball from hiding, affecting the cleaning effect and the recovery rate of the rubber ball. The system piping layout should be simple, short straight, and the number of elbows should be reduced as much as possible. Reasonable use of rubber ball pump, there must be sufficient flow, the outlet pressure is slightly greater than the circulating water pressure (about 0.2MPa or more). Regularly check the number of rubber balls in the ballroom, and constantly replenish and meet the cleaning requirements.
Condenser rubber ball cleaning system is a mature technology, which has the characteristics of simple structure, convenient operation, high recovery rate of rubber ball and strong filtering ability of secondary filter. After application, the dirt in the heat exchanger tube bundle of the condenser can be effectively removed, so the heat transfer heat resistance is significantly reduced, and the vacuum of the condenser is obviously improved. In order to obtain a better rubber ball cleaning effect, it is recommended to perform a pickling of the condenser before the sizing ball cleaning device, and then cleaning the condenser with a rubber ball cleaning device.
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