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In electric power, chemical industry, petroleum, metallurgy and other enterprises, a large number of heat exchange and expansion equipment need to control the liquid level by adjusting the outlet flow. At present, most of the products used are mechanical floating ball type, electric type and pneumatic type. These products not only have high cost and complex control, but also have frequent actions of actuators, which are easy to jam, wear, cavitation and leakage. High cost of maintenance, resulting in significant impact on equipment safety. It can be seen that the self-adjusting liquid level control device with excellent performance and high reliability is the product urgently needed by enterprises to improve economy and safety.
In the past, most of the similar equipment had the disadvantages of compromise adjustment, low sensitivity and large error rate. Some of them had to be changed to manual operation to increase labor intensity. It has a serious impact on the economy and safety of the equipment. Some of them cause serious economic loss to the operation personnel.
The self-adjusting liquid level control device of vapor-liquid two-phase flow has the characteristics of strong liquid level control ability, high reliability, maintenance free and long service life. It is an updated product of traditional drainage control equipment. It can be widely used in high-pressure and low-pressure heaters, shaft seal heaters, heat supply network heaters, boiler continuous exhaust equipment and heat exchange equipment and expansion vessels of metallurgical, petroleum, chemical and other enterprises. It can thoroughly solve the problem of liquid level control for 300MW, 600MW and above units in power plants and related equipment in petroleum and chemical industry.
The new controller can be used in high and low pressure heaters, heat exchangers, shaft seal heaters, high and low pressure continuous blowdown flash tanks, etc.
?? ? new type Self adjusting liquid level controller for vapor liquid two phase flow It is a new type of water level control device based on the theory of fluid mechanics and the flow characteristics of vapor-liquid two-phase flow. The device has no mechanical moving parts and electrical and pneumatic components. Therefore, it overcomes the inherent defects of the conventional water level gauge fundamentally, and its reliability and safety is particularly prominent, which is better than the similar products at home and abroad, and is the first one in China to reach the international advanced level. The device has the advantages of small volume, less cloth, simple structure and system. It is easy to install without maintenance. The liquid level controller of vapor-liquid two-phase flow is developed on the basis of the first three generations to solve the problems existing in the previous application process. Compared with the previous generations of products, it has made a breakthrough in technical performance and overcome the shortcomings of poor stability and small regulation and control range, especially the poor control ability of low load regulation. The biggest characteristics of the new device are: larger adjustment range, stronger ability to adapt to off design conditions, and more stable water level. It has been widely used in the control of high-pressure and low-pressure water level heaters in 200MW units, including high-pressure and low-pressure heaters. With superior performance, advanced technology, excellent quality, accurate water level control and maintenance free, it is the preferred product to replace the traditional liquid level device.
3、 Specification and model of vapor liquid two phase flow products
|| 4、 Technical characteristics
??? 1 The self-regulation of liquid level is stable. Since the device can realize automatic and continuous liquid level regulation under various working conditions of the unit, the liquid level is relatively stable.
??? 2 High safety and reliability. Without any mechanical moving parts and electric drive control system, the reliability and safety are particularly prominent.
??? 3 Long life. The valve core is made of high-quality stainless steel, which is corrosion-resistant under high temperature and can meet the long-term operation of the equipment.
??? 4 Maintenance free. Once installed and used, it needs no maintenance
5、 Structure and working principle
Structure: the device is composed of sensor (signal cylinder) and control device.
The function of the sensor is to send the water level signal in the container and to adjust the amount of steam or liquid.
Control device: control the water level in the container.
Working principle: when the water level of the heater rises, the liquid level sensor sends a signal to reduce the air volume in the container, so as to reduce the steam flow through the control device, increase the drain water volume at the outlet, and the water level in the heater will drop accordingly. vice versa. Thus, the automatic control of water level of heater is realized.
6、 Installation and commissioning
one . the sensor must be vertical and the upper branch pipe should be connected with the steam balance pipe of the heater. The lower part is connected with the water balance pipe of the heater.
???? 2 . The steam balance pipe should be higher than the warning water level of the heater when connecting. The connection of the water balance pipe on the heater shall be lower than the minimum water level.
???? three Regulating device It is best to place horizontally, and can also be placed vertically under special circumstances
7、 Order notice
??? 1、 Steam pressure of heater (MPA)
2. Steam temperature of heater (℃)
3. Steam flow of heater (T / h)
drain capacity of heater (T / h at maximum time)
Diameter of drain pipe of heater (mm)
Height from drain water of final stage high pressure heater to deaerator (m)
Pressure of deaerator (MPA): 7
Advantages of the product
1. The operation practice shows that, Automatic water level control device for vapor liquid two phase flow After putting into operation, the self-regulation ability is strong. When the unit load changes in the range of 100% - 60%, the fluctuation value of the water level of the heater is 50-100 mm, and it can work automatically to ensure that there is no alarm above the water level and there is a water level below. Moreover, the debugging operation is simple and convenient, and no further adjustment is needed after one adjustment, which can start and stop at random without operation, thus reducing the maintenance and management workload of operators.
2. The reliability has been improved significantly
because Automatic water level control device for vapor liquid two phase flow Compared with the original water level regulator, there are no mechanical operation parts, electrical and pneumatic control elements, so the failure rate of water level regulator is greatly reduced, the maintenance workload of field maintenance personnel is reduced, and the service life is long. Since the new water level gauge is a fully sealed device, it has no leakage and is safe and reliable. The thermal control system and devices of the original water level regulator are all cancelled, which eliminates the maintenance and management of thermal personnel.
3. Improve economic efficiency
The feed water temperature (average value in the second half of 2004) of unit 6 of a 200MW unit in a power plant was 234.4 ℃, and the feed water temperature (average value in the second half of 2005) was 239.6 ℃ after transformation, and the feed water temperature increased by 5.2 ℃. According to the thermal calculation results of 200MW unit, the coal consumption is affected by 2.0g/kw · h for every 10 ℃ increase of feed water temperature. If the load factor is deducted, 450 million KW · h of standard coal will be saved in the second half of the year, and 900 tons of standard coal will be saved in the whole year based on 900 million KW · h power generation. The economic benefit is very obvious after the transformation.
ZTQ Type a self regulating liquid level control device
In electric power, chemical industry, petroleum, metallurgy and other enterprises, a large number of heat exchange and expansion equipment need to control the liquid level by adjusting the outlet flow. At present, most of the products used are mechanical floating ball type, electric type and pneumatic type. These problems, such as frequent leakage, high cost and easy to control, are not only common, but also easy to control. It leads to high failure rate and high maintenance cost, which has a significant impact on the safe and economic operation of the equipment. It can be seen that the self-adjusting liquid level control device with excellent performance and high reliability is the product urgently needed by enterprises to improve economy and safety.
Lianyungang Tege Power Equipment Co., Ltd ZTQ Series of self-adjusting liquid level control device, with strong liquid level control ability, high reliability, maintenance free, long life and other characteristics, is the replacement of traditional drainage control equipment. Dh-kx series products are the latest generation of self-adjusting liquid level control device designed by the company based on the patented technology of zl002 26212.6, which can be widely used in high and low-pressure heaters, shaft seal heaters, heat supply network heaters, boiler continuous exhaust and other equipment of power system, as well as heat exchange equipment and expansion vessels of metallurgical, petroleum and chemical enterprises, and can completely solve the power generation problem It is difficult to control the liquid level of 300 MW, 600 MW and above units and related equipment in petroleum and chemical industry.
ZTQ Based on the principle of "vapor-liquid two-phase flow", the type-1 self-adjusting liquid level control device abandons the shortcomings of traditional floating ball type, pneumatic type and electric type liquid level control equipment, and automatically adjusts the liquid flow at the outlet of the container, so as to achieve a more stable liquid level. According to the basic design principle, the liquid level is directly mixed with the inlet of the steam trap. When the liquid level rises, the vapor phase signal decreases, so the drain flow rate increases; when the liquid level decreases, the vapor phase signal increases, reducing the effective flow area of the throat, and the drainage flow rate decreases, so as to effectively block the drainage.
1. Maximum design working pressure: ≤ 16MPa;
2. Maximum design working temperature: ≤ 540 ℃;
3. Regulating steam consumption: about 3% of drain volume flow.
ZTQ Ten advantages of products
1) Independent intellectual property rights.
2) High tech, high quality.
3) The liquid level self-regulation performance is strong, and the applicability is strong.
4) No leakage, no maintenance.
5) High safety: no mechanical moving parts, no pneumatic and electric control system, advanced design principle, and inspection process such as pressing and flaw detection in strict accordance with national standards before delivery.
6) Alleviate cavitation and vibration phenomenon: the liquid level control is stable, greatly alleviating cavitation and vibration in the pipeline.
7) The system is simple and easy to install: the device does not need the electrical control system, and the system is simple and easy to install on site.
8) Good corrosion resistance.
9) Special material, long life.
10) It has wide application range and strong adaptability.
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