(Daily Question) Coal-to-Oil and Olefins Forum, 2018.2.4

Answer: 1. Mechanical cleaning. Mechanical cleaning involves using tools such as wire brushes and bristles to manually remove scale. The disadvantages are long duration and high labor intensity; this method is now rarely used. 2. Pickling. When the condenser is covered with hard scale and the vacuum cannot be maintained, the unit should be shut down for acid cleaning. Use an acid solution to dissolve and remove hard water scale. While removing scale, appropriate measures must also be taken to prevent the copper pipes from corroding. 3. Adopt the drying method. When the condenser is covered with soft scale and sludge, the ventilation and drying method can be used for treatment. The principle behind this method is to crack the microorganisms and sludge inside the tubes, allowing water to flush them away. 4. Backwashing method. The soft scale in the condenser can also be removed by using cooling water to flow in the reverse direction through the copper tubes on a regular basis, via a backwashing method. The disadvantage of this method is that it requires additional investment in pipeline valves, making the system more complex. 5. Continuous cleaning method with rubber balls. It involves introducing rubber balls with a density similar to that of water into the circulating water, and using these balls to pass through the cooling pipes in order to clean away the soft deposits inside the copper pipes. It is a good cleaning method, and it is currently widely used in power plants across China. 6. High-pressure water pump. (15–20 MPa). High-speed water flow impact vibration flushing method.

1. Mechanical cleaning. Mechanical cleaning involves using tools such as wire brushes and bristles to manually remove scale. The disadvantages are long duration and high labor intensity; this method is now rarely used. 2. Pickling. When the condenser is covered with hard scale and the vacuum cannot be maintained, the unit should be shut down for acid cleaning. Use an acid solution to dissolve and remove hard water scale. While removing scale, appropriate measures must also be taken to prevent the copper pipes from corroding. 3. Adopt the drying method. When the condenser is covered with soft scale and sludge, the ventilation and drying method can be used for treatment. The principle behind this method is to crack the microorganisms and sludge inside the tubes, allowing water to flush them away. 4. Backwashing method. The soft scale in the condenser can also be removed by using cooling water to flow in the reverse direction through the copper tubes on a regular basis, via a backwashing method. The disadvantage of this method is that it requires additional investment in pipeline valves, making the system more complex. 5. Continuous cleaning method with rubber balls. It involves introducing rubber balls with a density similar to that of water into the circulating water, and using these balls to pass through the cooling pipes in order to clean away the soft deposits inside the copper pipes. It is a good cleaning method, and it is currently widely used in power plants across China. 6. High-pressure water pump. (15–20 MPa). High-speed water flow impact vibration flushing method.

1. Mechanical cleaning. Mechanical cleaning involves using tools such as wire brushes and bristles to manually remove scale. The disadvantages are long duration and high labor intensity; this method is now rarely used. 2. Pickling. When the condenser is covered with hard scale and the vacuum cannot be maintained, the unit should be shut down for acid cleaning. Use an acid solution to dissolve and remove hard water scale. While removing scale, appropriate measures must also be taken to prevent the copper pipes from corroding. 3. Adopt the drying method. When the condenser is covered with soft scale and sludge, the ventilation and drying method can be used for treatment. The principle behind this method is to crack the microorganisms and sludge inside the tubes, allowing water to flush them away. 4. Backwashing method. The soft scale in the condenser can also be removed by using cooling water to flow in the reverse direction through the copper tubes on a regular basis, via a backwashing method. The disadvantage of this method is that it requires additional investment in pipeline valves, making the system more complex. 5. Continuous cleaning method with rubber balls. It involves introducing rubber balls with a density similar to that of water into the circulating water, and using these balls to pass through the cooling pipes in order to clean away the soft deposits inside the copper pipes. It is a good cleaning method, and it is currently widely used in power plants across China. 6. High-pressure water pump. (15–20 MPa). High-speed water flow impact vibration flushing method.

⑴ Mechanical cleaning. Mechanical cleaning involves using tools such as wire brushes and bristles to manually remove scale. The disadvantages are long duration and high labor intensity; this method is now rarely used. ⑵ Pickling. When hard scale forms on the condenser copper tubes and the vacuum cannot be maintained, the unit must be shut down for acid cleaning. Use acid to dissolve and remove hard water scale. While removing scale, appropriate measures must also be taken to prevent the copper pipes from corroding.

⑴ Mechanical cleaning. Mechanical cleaning involves using tools such as wire brushes and bristles to manually remove scale. The disadvantages are long duration and high labor intensity; this method is now rarely used. ⑵ Pickling. When hard scale forms on the condenser copper tubes and the vacuum cannot be maintained, the unit must be shut down for acid cleaning. Use acid to dissolve and remove hard water scale. While removing scale, appropriate measures must also be taken to prevent the copper pipes from corroding.

1. Mechanical cleaning. Mechanical cleaning involves using tools such as wire brushes and bristles to manually remove scale. The disadvantages are long duration and high labor intensity; this method is now rarely used. 2. Pickling. When the condenser is covered with hard scale and the vacuum cannot be maintained, the unit should be shut down for acid cleaning. Use an acid solution to dissolve and remove hard water scale. While removing scale, appropriate measures must also be taken to prevent the copper pipes from corroding. 3. Adopt the drying method. When the condenser is covered with soft scale and sludge, the ventilation and drying method can be used for treatment. The principle behind this method is to crack the microorganisms and sludge inside the tubes, allowing water to flush them away. 4. Backwashing method. The soft scale in the condenser can also be removed by using cooling water to flow in the reverse direction through the copper tubes on a regular basis, via a backwashing method. The disadvantage of this method is that it requires additional investment in pipeline valves, making the system more complex. 5. Continuous cleaning method with rubber balls. It involves introducing rubber balls with a density similar to that of water into the circulating water, and using these balls to pass through the cooling pipes in order to clean away the soft deposits inside the copper pipes. It is a good cleaning method, and it is currently widely used in power plants across China. 6. High-pressure water pump. (15–20 MPa). High-speed water flow impact vibration flushing method.

⑴ Mechanical cleaning. Mechanical cleaning involves using tools such as wire brushes and bristles to manually remove scale. The disadvantages are long duration and high labor intensity; this method is now rarely used. ⑵ Pickling. When hard scale forms on the condenser copper tubes and the vacuum cannot be maintained, the unit must be shut down for acid cleaning. Use acid to dissolve and remove hard water scale. While removing scale, appropriate measures must also be taken to prevent the copper pipes from corroding.

Mechanical cleaning, chemical cleaning, rubber ball cleaning method, reverse flushing method

Backwashing method, mechanical cleaning method, dry cleaning, high-pressure flushing, and rubber ball cleaning method.

Answer: 1. Mechanical cleaning. Mechanical cleaning involves using tools such as wire brushes and bristles to manually remove scale. The disadvantages are long duration and high labor intensity; this method is now rarely used. 2. Pickling. When the condenser is covered with hard scale and the vacuum cannot be maintained, the unit should be shut down for acid cleaning. Use an acid solution to dissolve and remove hard water scale. While removing scale, appropriate measures must also be taken to prevent the copper pipes from corroding. 3. Adopt the drying method. When the condenser is covered with soft scale and sludge, the ventilation and drying method can be used for treatment. The principle behind this method is to crack the microorganisms and sludge inside the tubes, allowing water to flush them away. 4. Backwashing method. The soft scale in the condenser can also be removed by using cooling water to flow in the reverse direction through the copper tubes on a regular basis, via a backwashing method. The disadvantage of this method is that it requires additional investment in pipeline valves, making the system more complex. 5. Continuous cleaning method with rubber balls. It involves introducing rubber balls with a density similar to that of water into the circulating water, and using these balls to pass through the cooling pipes in order to clean away the soft deposits inside the copper pipes. It is a good cleaning method, and it is currently widely used in power plants across China. 6. High-pressure water pump. (15–20 MPa). High-speed water flow impact vibration flushing method.