Liquid level control trap

1、 Application and advantages of high-pressure steam trap:

High pressure steam trap, also known as vapor-liquid two-phase flow liquid level control device, is suitable for water control of pressure vessels such as high and low pressure heaters, continuous discharge expansion vessels, raw water heaters, and heating network heaters in the power industry; It is also applicable for water level control of various containers in the petroleum, chemical, and steel industries.

After the application of the new type of high-pressure steam trap, the workload of on-site maintenance and operation has significantly decreased, saving maintenance costs and reducing labor intensity. Secondly, due to the lack of pneumatic and electric thermal control systems and complex thermal ancillary equipment, the new type of high-pressure steam trap reduces maintenance personnel and greatly improves the operational management level of the equipment. High pressure steam traps are maintenance free equipment. The concept of high-pressure steam trap is novel, the working principle is advanced, the self regulating ability is strong, and the liquid level control is stable; There are no mechanical moving parts, no electrical components, few components, and small volume, so the structure and system are simple, easy to install, and the performance is safe and reliable.

2、 Working principle of high-pressure steam trap:

High pressure steam trap, also known as gas-liquid two-phase flow liquid level control device, is a new concept of liquid level controller designed based on fluid mechanics theory and control principles, utilizing the flow characteristics of gas-liquid two-phase flow. It belongs to self operated intelligent regulation and requires a small amount of steam (about 1-2% of the displacement) as the driving source for the actuator. The liquid level controller consists of a regulator (labeled 4 in the figure) and a signal tube (labeled 2 in the figure)

Composed of two parts. The connection system of the controller on the heater of the thermal power plant is shown in the figure. The function of the signal tube is to send water level signals and transmit regulating steam.

The function of the regulator is to control the outlet water volume, which is equivalent to the actuator in an automatic regulation system. The regulation principle is that when the water level of the heater rises, the water level in the signal tube also rises, resulting in a decrease in the amount of regulating steam sent. Therefore, the amount of steam flowing through the two-phase flow in the regulator decreases, the amount of water increases, and the water level of the heater decreases accordingly. vice versa. This achieves automatic control of the heater water level.

3、 Specification and Model of High Pressure Heater:

According to the diameter of the regulator sensor: DN50, DN65, DN80, DN100, DN125, DN150, DN200, DN250, DN300, can be selected Suitable specifications and models can also be designed according to actual situations.

4、 Installation and Debugging:

（1） Installation of High Pressure Heater

1. The sensor must be vertical, with the upper branch pipe connected to the heater steam balance pipe and the lower part connected to the heater horizontal balance pipe.

2. The steam balance pipe should be connected to the heating connecting pipe above the warning water level, and the water balance pipe should be connected to the heater below the minimum water level.

3. It is best to place the regulator horizontally. In special circumstances, it may also be placed vertically. Install in the direction of the heated water outlet as much as possible.

4. Whether it's sensors or adjusting connections, the shorter the connecting pipe, the better, and the fewer bends, the better.

（2） Debugging of High Pressure Heater

1. Open various valves on each drainage pipeline and check if the water level gauge and controller are sensitive.

2. The drainage volume of the heating pipeline must be maintained at maximum load.

3. When debugging two or more water level controllers in a chain, the sequence should be from high pressure to low pressure.

4. Chain debugging bypass valve 5, regulating valve 4, slowly raise the water level to the normal level, and then open the regulating valve

5. Observe the water level and continue to gradually adjust it by closing regulating valve 4 until the water level can automatically maintain a stable state.

6. If there is full water during the height process, the bypass valve 7 can be opened appropriately.

5、 Ordering Notice for High Pressure Heater:

1. The user shall provide information on the type of equipment used with the high-pressure steam trap, as well as parameters such as pressure, temperature, and outlet pipe diameter.

2. Provide flanges for each connecting system, with dimensions for the connecting pipes.

 

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