The temperature and pressure reduction device is a steam thermal energy parameter (pressure, temperature) conversion system that is widely used in modern industry, combined heat and power generation, central heating (or steam), light industry, electric power, chemical industry and other thermal energy projects. This device is an energy-saving device that utilizes waste heat. Through this device, the steam parameters provided by the user are reduced to the appropriate temperature and pressure required by the user to meet the user's requirements. It can fully save heat energy and rationally utilize heat energy.
Working principle of the temperature reduction and pressure reduction device: There are many structural forms of the temperature reduction and pressure reduction device, but regardless of its form, it generally consists of a cooling system, a pressure reducing system (or a cooling and pressure reducing system), a main steam pipe body, and a safety protection system. , thermal control system and other parts. The structural components of the temperature and pressure reduction device include a pressure reducing valve, an orifice, a steam mixing pipe (with a nozzle), a safety valve, a water supply regulating valve, a throttle valve, a stop valve, a check valve, a pressure reducing water pipe, and a flange. Standard parts, etc.
1. Cooling system: The cooling water passes through the high-pressure difference regulating valve (or variable frequency water pump, etc.) and is sprayed into the steam in the steam pipe in the form of mist from different types of nozzles to reduce the steam temperature.
2. Pressure reducing system: composed of pressure reducing valve and orifice plate. The pressure reducing valve achieves the purpose of regulating pressure by changing the flow area.
3. Cooling and pressure reducing system: The cooling system and the pressure reducing system are combined into one, which reduces the overall size of the temperature reducing and pressure reducing device and increases the technical complexity.
4. Main steam pipe body: It is composed of a mixing pipe and a steam pipe. It is the main equipment of the temperature and pressure reduction device. Its purpose is to send the cooled and decompressed steam into the pipes required by the user.
5. Safety system of temperature reduction and pressure reduction device: In order to prevent the secondary steam pressure from exceeding the specified value, the safety valve is automatically opened to discharge excess steam, thereby achieving the functions of pressure reduction and safety protection.
The pressure reducing system adopts a double-seat pressure reducing valve structure, which has small balance force, large adjustment range, smooth movement and no jamming. The desuperheating system adopts a steam pipe nozzle method with no transmission parts. The desuperheating water atomization effect is good, the nozzle is easy to disassemble and assemble, and the desuperheating and pressure reducing device is easy to maintain. The pressure reducing system is separated from the temperature reducing system and is mainly used in harsh working conditions, such as low steam flow, unsuitable for use of temperature reducing and pressure reducing valves, and saturated steam (low pressure) conditions. The temperature reduction and pressure reduction device mainly adopts the steam pipe cooling method, and the cooling water is fully atomized to achieve better cooling effect.
