XINLI BOILER

There are many details in the working process of the biomass boiler, which need to be paid attention to at all times

02 Sep, 2021

　　There are many details in the working process of the biomass boiler, you can not ignore it, you need to always pay attention to its working status. Once you find an anomaly, you need to figure out what happened to avoid some accidents. Next, let's take a look at the use of biomass boilers.

　　The water intake rate before start-up should not be too fast, generally not less than 4h in winter, 2~3h in other seasons, mainly in the early stage of water harvesting. The feed water temperature of a biomass boiler is usually 50-90°C, so the difference between the temperature of the feed water entering the steam drum and the temperature of the drum wall does not exceed 40°C. After cooling, the inlet water temperature is equivalent to the temperature of the drum wall, otherwise the water inlet speed should be slowed down.

　　When feed water enters the steam drum, it always touches the lower half of the steam drum first. If the difference between the temperature of the feed water and the temperature of the drum wall is too large, the water inlet speed is fast, and the upper and lower walls, inner and outer walls of the drum will have large expansions. It causes a lot of additional stress on the steam drum, which leads to deformation of the steam drum and cracks in severe cases.

　　Due to the thick wall of the steam drum, the expansion is slow, and the pipe wall connected to the wall of the steam drum is thinner and expands faster. If its inlet temperature is too high or the water inlet speed is too fast, it will cause uneven expansion, cause cracks in the weld and cause damage to the biomass boiler. Therefore, during its operation, we cannot ignore the problem of too fast water intake, otherwise the impact will be very serious.

　　Its design, manufacture, installation and use all comply with the standard GB/T2624-93 flow measurement standard throttling device design, and the installation and use manual refers to the throttling device called "standard throttling device". The advantage is that the relationship between the flow rate and the pressure difference can be directly calculated from the data provided by the standard, instead of being obtained through calibration or calibration. The above-mentioned national standards comply with the ISO5167-1 standard introduced by ISO.

　　The standard throttling device is suitable for measuring the flow rate of a single-phase homogeneous fluid in a circular pipe. It requires fluid to fill the pipeline, there is no phase change or precipitation within a certain distance before and after the throttle, and the flow rate is less than the speed of sound. The flow is a non-pulsating flow, and the fluid flow before flowing through the throttle valve is parallel to the axis of the pipe and there is no swirling flow. The flow conditions are developing turbulence.

　　The standard throttling device is divided into standard holes, standard nozzles and long diameter nozzles.

　　The standard orifice plate is easy to process and has low cost. The disadvantage is that the fluid flow pressure loss is large; the characteristics of the standard nozzle are opposite to those of the standard orifice plate. The long diameter nozzle is suitable for the measurement of low Reynolds number flow.

　　There are two compression methods for the standard orifice plate of biomass boilers: corner connection pressure and flange pressure method. Among them, the corner joint pressure method is divided into two types: the annular chamber pressure method and the single-hole pressure method.