High-temperature reaction kettles need to work under high temperature conditions when performing chemical and chemical reactions. According to different reaction kettle performances, there are many options for water heating, hot steam heating, other medium heating, and electric heating.
1. Water heating: It can be used when the temperature is not high. There are two types of heating systems: open and closed. The open type is the simplest. It is composed of a circulating pump, a water tank, a pipeline, and a regulator that controls a valve. When high-pressure water is used, the mechanical strength of the equipment is high. The outer surface of the reaction kettle is welded with a snake tube. There is a gap between the snake tube and the kettle wall. The thermal resistance of the reactor increases and the heat transfer effect decreases.
2. Hot steam heating: when the temperature of the reaction kettle is below 100 ℃, it can be heated by steam below one atmosphere; saturated steam is used in the range of 100 ~ 180 ℃; when the temperature of the reactor is higher, high-pressure superheated steam can be used.
3. The reaction kettle is heated with other media: if the process requires that the reaction kettle must be operated at a high temperature, or if you want to avoid the use of high-pressure heating systems, other media can be used instead of water and steam, such as mineral oil (275 ~ 300 ℃), Diphenyl ether mixture (boiling point 258 ℃), molten salt (140 ~ 540 ℃), liquid lead (melting point 327 ℃), etc.
4. New type electric kettle heating: The resistance wire is wound on the insulation layer of the reactor kettle body, or installed on a special insulator a few distances away from the reaction kettle, so there is a gap between the resistance wire and the reactor kettle body. Large space gap. The use of the first three methods to obtain high temperature requires the addition of a jacket on the kettle body. Due to the large range of temperature changes, the jacket and shell of the kettle are subjected to temperature changes and generate temperature difference stress. Using electric heating, the equipment is light and convenient, the temperature is easy to adjust, and at the same time, no pumps, furnaces, chimneys and other facilities are required.
Dining chair is a common seat in restaurants, bars, cafes and other places for people to use when dining. According to different design styles, materials, functions and uses, dining chairs can be divided into a variety of categories. The following will be a brief introduction to the product classification of dining chairs.
First, according to the design style classification
1. Simple modern style: Simple modern style dining chairs usually use simple lines and Outlines, focusing on functionality and practicality, suitable for modern restaurants and cafes.
2. European classical style: European classical style dining chairs pay attention to gorgeous details and decoration, common hollow carving design and curve shape, suitable for high-end restaurants and banquet places.
3. Nordic style: Nordic style dining chairs focus on simple, natural and comfortable design, usually using wood materials and simple lines, suitable for family restaurants and cafes.
4. Industrial style: Industrial style dining chairs often use metal materials, with simple, solid and practical characteristics, simple and unadorned, suitable for cafes and bars and other places.
Second, according to the material classification
1. Wooden dining chair: Wooden dining chair is usually made of solid wood or artificial wood, with natural, environmental protection and warm characteristics, suitable for families and cafes and other places.
2. Metal dining chair: Metal dining chair is often made of metal materials such as iron, aluminum or stainless steel, with strong, durable and easy to clean characteristics, suitable for bars and cafes and other places.
3. Plastic dining chair: Plastic dining chair is usually made of polypropylene or polycarbonate and other plastic materials, with light, waterproof and easy to clean characteristics, suitable for fast food restaurants and school cafeterias and other places.
Third, according to the use of classification
Generally, it can be divided into two uses: domestic and commercial.
1. Home dining chair: Home dining chair pays attention to comfort and beauty, common dining table chair, folding chair and bar chair.
2. Commercial dining chairs: Commercial dining chairs pay attention to durability and practicality, common bar chairs, cafe chairs and fast food restaurant chairs.
In general: dining chair as one of the important furniture in restaurants, bars, cafes and other places, according to the design style, material and use of different, can be divided into a variety of categories. Choosing a dining chair that suits your place and needs can enhance the comfort and beauty of the dining environment.
Cafe chair,wholesale chair,stackable chair,connected chair
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