Automatic constant pressure valve + electric control valve performance

Abstract: Automatic constant pressure differential valve + electric control valve is used to solve the balance of air conditioning water system is a very good way, when the system pressure changes, the constant pressure differential valve can change its own flow area so that the electric control valve The pressure difference between the two ends remains the same, so that the CV value of the control valve is always one, thus ensuring that the electric control valve has been running in the best conditions, the real change in water temperature and has nothing to do with the pressure can be guaranteed The volume of water entering the air conditioner box is the amount of water you need at any one time. Plexus makes the system more superior performance, more convenient to maintain. Automatic constant pressure differential valve electric control valve hydraulic balance I. Automatic constant pressure differential valve + electric control valve performance profile Automatic constant pressure differential valve + electric control valve is currently used to solve the air conditioning water system balance a very good way, When the system pressure changes, the constant pressure differential valve can change its own through-flow area so that the pressure across the electric control valve remains the same, so that the CV value of the control valve is always one, so as to ensure that the electric control valve has been the most The ideal operating conditions, the real change is only the temperature and the water has nothing to do with the pressure, to ensure that the amount of water into the air conditioning box at any time is the amount of water you need. Plexus makes the system more superior performance, more convenient to maintain. The use of an automatic constant pressure differential valve + electric control valve at the end of the system eliminates the need for extensive use of balancing valves in stratified control so that system performance is superior and maintenance is more convenient. Automatic constant pressure differential valve + electric control valve is a variable flow air conditioning water system, an important guarantee of hydraulic balance, the use of automatic balance proportional integral valve in the system can bring you many benefits. 1, Because does not need to carry on the system debugging, therefore saves a lot of troubles, saved a large amount of time, shortened the completion date; 2, because does not need to use the valve group and the valve which is used for the stratification control, therefore has saved you more tubing , Insulation materials and installation costs and time; 3, so that the water system at all times in a balanced state, so regardless of the installation of staged construction or equipment will not affect the use of water system balance; 4, even after the project or put into operation Changing some uses and changing the water system design in some areas will not affect the design of water systems in other areas and will not affect the water system balance in other areas. 5. Because the whole system is in a state of dynamic equilibrium, the refrigeration units And the pump will be the most energy-efficient operation, saving a lot of operation and maintenance costs; 6, due to the system flow balance is automatic, make installation and maintenance more convenient and eliminate the possibility of human operation failure to destroy the balance. Second, the automatic balance proportional integral control valve and the static balance valve comparison Static balance valve is actually a man-made precise set of opening valve, he adjusted by the local resistance to air conditioning water piping system to solve part of the hydraulic balance questionable. At the beginning of the system commissioning, all the valves of the system are at a certain opening. The commissioning personnel set the opening of each static balance valve one by one according to the original mathematical model (the valve opening is set to a certain value after setting) , But for different water systems its resistance distribution curve is definitely not the same, and it can not be measured. Therefore, the static balance valve can only fuzzy, qualitative control of water flow. For a variable flow air conditioning water system, each air conditioning tank of water changes are random, the entire pipeline pressure changes are unpredictable, the valve opening is also random changes. Therefore, we can get from the formula G (flow) = CV × A (valve flow area) × △ P (differential pressure across the valve): Since the static balance valve is adjusted, the opening degree is a certain value. Therefore, changes in the pressure differential across the valve will inevitably result in changes in the flow through the static balance valve. So in a variable flow system when the system pressure changes when the static balance valve is unable to solve the problem of hydraulic imbalance. Will still cause the system over-current and under-current.

Boiler Auxiliary Equipment

Boiler auxiliary equipment mainly includes water supply equipment, ventilation equipment, fuel supply, slag removal and dust removal equipment, steam and water pipes and accessories, detection instruments and automatic control equipment.

1. Water supply equipment

It is composed of water treatment equipment, water supply tank and feed pump 24. Water treatment equipment is used to remove impurities in water, such as oxygen, calcium and magnesium ions, to avoid scaling and corrosion on the inner wall of steam boiler, and to ensure the quality of boiler water supply. The treated boiler feed water is lifted by the feed water pump and then sent to the upper drum through the economizer.

2. Ventilation

The ventilation equipment includes air supply fan, induced draft fan and chimney. Its function is to provide air for mule fuel combustion and lead out combustion product flue gas from the boiler, so as to ensure the normal combustion, and make the flue gas wash the heating surface at the necessary flow rate of 7a68696466fe78988e69d8331333433626465 to strengthen heat transfer. Finally, the stack with a certain height will exhaust the smoke to the atmosphere to reduce the smoke pollution and improve environmental health.

3. Fuel supply, slag removal and dust removal equipment

This is for conveying fuel to boiler, removing ash and purifying flue gas. Belt conveyor, ash conveyor, ash truck and dust remover, etc. For boilers that need to be pre processed with fuel, fuel preparation such as screening, crushing and coal grinding shall also be included. In addition, the dust remover or flue gas desulfurization and denitrification device installed in the flue at the tail of the boiler is an indispensable auxiliary equipment to reduce the smoke pollution and protect the environment.

4. Check instruments and automatic control equipment

In addition to water level gauge, pressure gauge, safety valve and other instruments installed on the boiler body, in order to supervise, regulate and control the safe and economic normal operation of the boiler equipment, a series of instruments, automatic boiler feed water regulating device, automatic fuel combustion control device, etc. are often installed. Some boiler rooms are also equipped with industrial television and remote control device and even more modern automatic control system, more Scientific supervision. Control boiler operation.

Boiler auxiliary equipment, not every boiler is equipped completely, but with the boiler capacity, type, fuel characteristics and combustion mode as well as water quality characteristics and many other factors to adapt to local conditions, adapt to the times, more practical requirements and objective conditions.

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