How to decompress applications with large fluctuations in steam flow

How to decompress applications with large fluctuations in steam flow

The baking process of the customer car production line requires the use of a large amount of steam as a heat source. Due to the process, the steam load of this process varies greatly, with a maximum of 50 tons/hour and a minimum of about 4 tons/hour. This has strict control over the pressure and flow control of the steam.

Since the quality of the paint on the body is mainly related to the quality of the steam pressure control, the use of steam is the most critical in terms of pressure control.

For various reasons, when the customer is building the plant, the steam control valve uses a British imported steam pressure reducing valve with a diameter of 200mm to achieve pressure control.

However, since the actual steam load varies greatly, the self-operated pressure control valve is always in a state of frequent opening and closing. On the one hand, the steam pressure does not reach the control process requirement due to the lag of the action, and the quality of the paint of the product is also Was affected.

On the other hand, the frequent opening and closing of the pressure reducing valve leads to excessive wear and valve core erosion. After the pressure reducing valve, the safety valve frequently takes off, which not only wastes energy, but also affects production. The customer takes this safety valve as a safety jump. The accident is recorded and processed, and the pressure reducing valve needs to be replaced on average for one year.

Through extensive and in-depth technical exchanges with the technical staff of the company's construction department, the company's technical staff also deeply understands that the problem cannot be solved by a single pressure control valve. It should be realized by connecting several pressure reducing valves in parallel. Accurate control of pressure. According to the specific technical situation of the company:

Pressure before decompression: 7.0 bar

Pressure after decompression: 3.0-4.0 bar

Steam usage range: 4.0T-50.0T

The engineer of Hangzhou Watt Energy Saving Engineering Co., Ltd. suggested that the company use 3 sets of Hangzhou Watt energy-saving PRV2000 pressure reducing valve (caliber 150mm) in parallel, split control to solve the problem, and was adopted.

Hangzhou Watt energy-saving PRV2000 pressure reducing valve is a pilot diaphragm type steam pressure reducing valve. The pressure reducing valve senses the downstream pressure fluctuation through the induction tube of the pilot valve, and controls the valve opening according to the conforming change. Watt PRV2000 pressure reducing valve The control accuracy is very high, and the pressure can be accurately controlled within ±0.1 bar regardless of upstream pressure fluctuations or load changes. Because the pressure of the steam and the flow load relationship, the pressure control can not be accurately controlled by a pressure reducing valve. Only the three pressure reducing valves are connected in parallel. According to the control pressure fluctuation range of the PRV2000 pressure reducing valve is ±0.1 bar. We set the pressure of the three valves to 3.1 bar (A valve), 3.3 bar (B valve), and 3.5 bar (C valve).

When the company uses less steam and has a lower load, according to its process requirements, only the C valve with a high set value is automatically opened, the steam passes, the flow demand is met, and the pressure of the steam is controlled at 3.4 bar-3.6 bar. In order to achieve accurate control of pressure.

When the steam consumption increases, the C valve can not meet the maximum flow rate, the steam pressure drops (between 0.2 bar) and the accurate feedback of the downstream pressure feedback tube, the B valve automatically opens, and the two pressure valves work to increase the steam. Through the amount, to meet the needs of the process. As the amount of steam is gradually increased, the pressure continues to decrease, the A valve is automatically opened, and the three pressure reducing valves are simultaneously operated to increase the throughput of steam to meet the production needs.

When the steam consumption is reduced again, the A valve is first closed due to the increase in pressure (0.2 bar), and the two pressure reducing valves of the B valve and the C valve are operated. As the amount of steam continues to decrease, the B valve also automatically closes and the C valve works alone. When the flow is smaller until it is zero, the C valve closes. Through such a cycle, accurate control of the pressure is achieved when the load changes greatly.

Through the above improvements, the customer achieves accurate control of the pressure when the load fluctuates greatly.

In the nearly three years of work, customer feedback is very desirable. The company's forest engineer said that by using the professional steam valve products of Hangzhou Watt Energy Saving Engineering Co., Ltd., the steam pressure control can be better realized, and the good quality of the company's products is guaranteed.

While the customer is in contact with the steam technology engineer of Hangzhou Watt Energy Saving Engineering Co., Ltd., the traditional steam use concept has also undergone great changes. There is a relatively basic understanding of how to use steam properly and how to effectively save energy.

Advanced products, professional services and a spirit of sharing have brought Watt closer to the public. The two sides have established a series of in-depth cooperation from personnel training, steam system research, steam system annual maintenance contract, and customer steam consumption. There has been a gradual decline.

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