Fixed pressure mode in biomass hot stove heating system: In high temperature hot water supply system, because the water temperature is higher than the saturation temperature of water under normal pressure, the pressure in the system should be higher than the saturation pressure of the corresponding water supply temperature, so as to avoid hot water vaporization and water shock. Water is an uncompressible fluid. Once it leaks, it will reduce the pressure. On the contrary, water heating will shrink the volume. If the pressure cannot be stabilized, it will also destroy the equipment in the heating system. Therefore, in order to avoid pressure reduction, vaporization and contraction, high temperature hot water system must stabilize the pressure in the system, which is constant pressure. There are several ways of constant pressure for hot water heating systems.
1) adopt the constant pressure mode of elevated water tank.
The fixed pressure point of this method is located at the inlet or backwater main line of the hot water circulating pump. It is only installed as an elevated water tank. It has simple structure, stable and reliable operation, can stabilize the system pressure, and can meet the overflow and water supply requirements of the system network. In this system, the height of the water tank device must satisfy the request that the highest point of the system is not vaporized. Therefore, the device has a higher position. This constant pressure method is applicable to the low temperature water heating system with small heating area.
2) adopt the constant pressure way of recharge pump.
供热系统压力较高时，采用高级水箱不能保证系统所需的压力，此时，应当采用补给水泵定压方式。这种定压方式在苏联热水热风炉供热系统中被普遍应用。补给水泵定压有连续补水定压和连续补水定压两种方式。 此生物质热风炉定压方式的安装由补给水箱，补给水泵，压力调理器等组成。当系统运转正常时，经过压力调理器调理使补给水泵连续补水并使之与系统的走漏量相顺应，从而维持系统压力的稳定。当循环水泵停运时，能够关闭压力调理器前的截止阀。补给水泵仍连续补水以维持系统所需的静压。这种定压方式无需收缩水箱，因此设备费用低廉，此外，补给水泵又补水又定压，水泵功率不大，运转费用也很小。因而，这种方式在我国热水供热系统中应用相当普遍。 这种定压方式最大的缺陷是假如系统忽然停电时，补给水泵将失去定压作用。为避免此时热风炉缺水汽化，系统中采用了压力上水辅助型安装，当循环水泵运转时，由于上水辅助安装，循环水不会倒灌到压力上升系统中去。当忽然停电而使循环水泵，补给水泵停运时，压力上水系统立刻投入运转，止回阀被自动翻开，压力水将流经热水热风炉并从集气罐排出，从而防止了炉室余热惹起锅水汽化。与此同时的操作是应该关闭供，回热水管总阀，使得热源和热网隔绝开来。 生物质热风炉补给水泵连续补水定压由电接点压力表控制来完成，循环水泵入口压力能够维持在一定范围内，当压力低于这个范围时，电接点压力表动作并接通补给水泵电动机电路，补给水泵运转，补水，热水循环泵入口压力升高并超越一定范围时，热水热风炉的压力表就是切断补给水泵电源，是补给水泵停运。如此往复动作，补给水泵连续补水，并维持系统压力在一定范围内动摇，这样系统定压方式，由于连续补水，就比连续补水俭省电能，但是其调理和定压质量比连续补水方式要差，还有压力动摇大，压力表触点动作频繁易于损坏等缺陷。
When the pressure of heating system is high, the use of advanced water tank can not guarantee the pressure required by the system. At this time, the way of constant pressure of supply pump should be adopted. This constant pressure method is widely applied in the Soviet hot water hot stove heating system. There are two ways to supply water pumps: constant pressure and constant pressure. The installation of the constant pressure mode of the biomass hot blast stove consists of a supply water tank, a supply water pump, a pressure regulator, etc. When the system is in normal operation, the pressure regulator is used to make the supply pump continuously replenish water and make it conform to the leakage of the system, so as to maintain the stability of the system pressure. When the circulating pump is out of service, the cut-off valve before the pressure regulator can be closed. The replenishment pump continues to replenishment to maintain the static pressure required by the system. This constant pressure method does not need to shrink the water tank, so the cost of equipment is low. In addition, the supply pump is also constant pressure, the pump power is not large, and the operation cost is small. Therefore, this method is quite popular in China's hot water heating system. The biggest defect of this constant pressure method is that if the power system is suddenly cut off, the supply pump will lose its constant pressure function. In order to avoid water shortage and vaporization of hot blast stove at this time, the system adopts pressure water auxiliary installation. When the circulating water pump is running, because of the auxiliary installation of water, circulating water will not be poured back into the pressure rising system. When the circulating water pump and the supply water pump are shut down due to a sudden power failure, the pressure water supply system is put into operation immediately, the check valve is automatically opened, and the pressure water will flow through the hot air stove and be discharged from the gas collecting tank, thus preventing the boiler water vaporization caused by the residual heat of the furnace chamber. At the same time, the operation is to turn off the supply and reheat the main valve of the water pipe, so that the heat source and the heat supply network will be cut off. The constant pressure of feedwater pump for biomass hot blast stove is controlled by electric contact pressure gauge. The inlet pressure of circulating water pump can be maintained in a certain range. When the pressure is below this range, the electric contact pressure gauge acts and connects the motor circuit of feedwater pump. The feedwater pump runs, replenishes water and the inlet pressure of hot water circulating pump. When rising and beyond a certain range, the pressure gauge of hot water stove is to cut off the power supply of the recharge pump, and the recharge pump is out of operation. Such reciprocating action, supply pump continuously replenish water, and maintain the system pressure to shake in a certain range, so that the system constant pressure mode, because of continuous replenishment of water, is better than continuous replenishment of water to save electricity, but its conditioning and pressure quality is worse than continuous replenishment mode, there is pressure fluctuation, pressure gauge contact action is frequent and easy to damage. Defects such as bad.
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