The constant pressure in the biomass boiler heating system
* : * : admin * : 2014-07-10 * : 37
Biomass boiler heating system in the mode of constant pressure: in the high temperature hot water supply system, as a result of the water temperature is higher than the atmospheric pressure water saturation temperature, therefore, in the system pressure shall be higher than the corresponding saturation pressure of water supply temperature, such ability can avoid hot water evaporation and water attack. Water is an unretrenchable fluid, and when it leaks, it depresses. On the contrary, water heating will shrink, if not stable pressure, also can destroy the equipment in the heating system. Therefore, in order to avoid the reduction of pressure and pressure, the high temperature hot water system must stabilize the pressure in the system, which is the constant pressure.

The constant pressure of hot water heating system is as follows:

1), the use of elevated water tank constant pressure way < br > the way of constant pressure point is located in the hot water circulation pump suction or return water main, installation just for an elevated water tank, its simple structure, stable work, can stabilize the system pressure, and can satisfy the request system network of water and water. In such a system, the height of the tank must meet the request that the highest point in the system is not vaporized. Therefore, the location of the device is high. This method is suitable for low temperature water heating system with small heating range.

2) in the case of high pressure of supply pump, the high water tank can not guarantee the pressure required by the system. At this time, it is necessary to use the supply pump constant pressure method. This kind of constant pressure method is widely used in the heating system of Soviet hot water boiler. There are two ways of constant pressure and continuous water supply constant pressure. The installation of the material boiler in this lifetime is composed of supply tank, supply pump, pressure adjuster and so on. When the system is operating normally, the supply pump is continuously replenished by the pressure regulator to make it conform to the leakage of the system, thus maintaining the stability of the system pressure. When the circulating pump is shut down, it can turn off the stop valve before the pressure adjuster. The supply pump continues to hydrate to maintain the static pressure required by the system. This kind of constant pressure method does not need to shrink the water tank, so the equipment cost is low, in addition, the supply pump is rehydrated and constant pressure, the pump power is small, the operation cost is very small. Therefore, this method is quite common in hot water heating system in China. The biggest drawback of this type of constant pressure is that if the system suddenly loses power, the supply pump will lose its constant pressure. In order to avoid the boiler water evaporation, water pressure is adopted in system installation auxiliary type, when circulating water pump operation, auxiliary installation due to water, circulating water is not flowing to the pressure rise in the system. When all of a sudden power failure and make the circulating pump, supply water pump is offline, pressure water system operation immediately, the check valve is automatically opened, the water will flow through the hot water boiler pressure and is discharged from the collection tank, thereby preventing the furnace chamber heat make dish up water evaporation. At the same time, the operation is to close the supply and return the main valve of the hot water pipe to separate the heat source from the heat network. Biomass boiler make-up water pump for filling water constant pressure are done by the electric contact pressure gauge control, circulating water pump inlet pressure to maintain within a certain range, when the pressure is lower than this range, action and contact monometers circuit through to supply water pump motor, supply water pump operation, filling water, hot water circulating pump inlet pressure and beyond a certain range, hot water boiler pressure gauge is to cut off the supply of the pump power, supply water pump is shut down. So reciprocating movement and continuous filling water supply pump, and maintain the system pressure within a certain range, so that the constant pressure system, due to the continuous hydrating, frugal energy than continuous hydrating, but its control and constant voltage quality is poor than continuous hydrating way, shake and pressure, pressure gauge contact action frequent defects such as easy to damage.