Major product "burst valve for nuclear power plant" product prototype passed the appraisal

[China Instrument Network Instrument R&D] On February 3, 2018, a major project of pressurized water reactors jointly developed by Shanghai Nuclear Engineering Research and Design Institute, Dalian Dagao Valve Co., Ltd. and China Institute of Engineering Physics, was used for nuclear power plants. "Bursting valve" product prototype passed the appraisal jointly organized by China Machinery Industry Federation and China General Machinery Industry Association.

The appraisal committee consists of 13 experts from China National Nuclear Corporation, China National Nuclear Power Corporation, the National Nuclear and Radiation Safety Center of the Ministry of Environmental Protection, Dalian University of Technology and Nanjing University of Science and Technology, including Academician Ye Qichen and Academician Cheng Yidong. The Ministry of Science and Technology, the Energy Bureau, and representatives of local governments, employers, R&D units, and related personnel attended expert product appraisal meetings.

The appraisal committee unanimously held that the prototype of the blast valve product developed was successful, with complete independent intellectual property rights, filling the gaps in the domestic market and occupying the leading international level, and can be promoted and applied at nuclear power plants.

China's first self-developed explosives valve and its series of the world's largest specifications (DN450) have many innovative features: the key components - cartridge drive device, can operate reliably under harsh environment conditions such as high temperature, high humidity, and high radiation of nuclear power; Established advanced methods for calculating ballistic trajectory for blasting valves and dynamic simulation analysis methods for complete machines and key components; independently developed blasting valve graphite sealing structure and piston dynamic sealing structure to ensure the realization of valve safety functions; and overcoming the forging of shear caps. Process to ensure shear cover material properties.

The achievement of scientific and technological achievements in the "burst valve for nuclear power plants" is a manifestation of the nation's overall strength, a model of deep integration of military and civilians, a breakthrough in the battle for the domestic nuclear power industry and a standard achievement in the autonomy of key equipment for nuclear power. It is also an advanced nuclear power system in China. "Going out" made a contribution.

(Original title: Significant special "burst valve for nuclear power plant" product prototype passed the appraisal)

Boiler Auxiliary Equipment

Soot Blower 001 Jpg 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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