Calculation and application of product selection shared by Jiangxin electromagnetic boiler manufacturer

It is said that boiler is a kind of thermal equipment that uses the heat released after fuel combustion or the waste heat in industrial production to transfer to the water in the container to make the water reach the required temperature (hot water) or a certain pressure steam. It is a complete whole composed of boiler (i.e. water pressure part of boiler body), furnace (i.e. combustion equipment Part), auxiliary instruments and auxiliary equipment.

The boiler is carried out in both boiler and boiler at the same time. After the water enters the boiler, the boiler heating surface will transfer the absorbed heat to feed water in the steam water system to heat the water into steam with a certain temperature and pressure, which will be led out for application. In the part of combustion equipment, the fuel combustion continuously releases heat. The high-temperature flue gas generated by combustion transmits the heat to the heating surface of the boiler through heat transmission, and its temperature gradually decreases and then discharged from the chimney.

Classification of electromagnetic boilers

Electromagnetic boilers can be divided into electric electromagnetic boilers, oil-fired electromagnetic boilers and gas-fired electromagnetic boilers according to fuel; According to the structure, it can be divided into vertical electromagnetic boiler and horizontal electromagnetic boiler. Small electromagnetic boiler is mostly single and double return vertical structure, and large electromagnetic boiler is mostly three return horizontal structure.

According to the outlet steam pressure, it is divided into: low pressure boiler (P ＜ 2,45mpa), medium pressure boiler (3,8 ＜ P ＜ 5,8mpa), high pressure boiler (5,9 ＜ P = 12,6mpa), ultra-high pressure boiler (12,7 ＜ P = 15,8mpa), subcritical boiler (15,9 ＜ P = 18,3mpa), supercritical boiler (22,115 ＜ P ＜ 30MPa), ultra supercritical boiler ＞ 30MPa.

Electromagnetic boilers can be divided into electric electromagnetic boilers, oil-fired electromagnetic boilers and gas-fired electromagnetic boilers according to fuel; According to the structure, it can be divided into vertical electromagnetic boiler and horizontal electromagnetic boiler. Small electromagnetic boiler is mostly single and double return vertical structure, and large electromagnetic boiler is mostly three return horizontal structure.

Vertical double return structure

The vertical oil-fired and gas-fired electromagnetic boiler adopts the lower mode of burner and two-way structure, with sufficient fuel combustion and stable boiler operation; The smoke pipe is inserted with a spoiler to slow down the smoke exhaust speed, increase the heat exchange, improve the thermal efficiency of the boiler and reduce the user's use cost.

Horizontal three return structure

The horizontal electromagnetic boiler is a shell type full wet back downstream three return pyrotechnic tube structure. The flame burns under micro positive pressure in the large combustion chamber, fully extends, has low combustion heat load and high combustion heat efficiency, effectively reduces the exhaust gas temperature, saves energy and consumption, and is economical to use. The structure of corrugated furnace liner and threaded smoke pipe not only improves the heat absorption strength of the boiler, but also meets the needs of thermal expansion of the heat exchange surface. It is scientific, reasonable and durable.

General structure of boiler

The boiler is the pressure parts of the boiler that cannot contain all the steam. It consists of drum (drum) or shell, water wall pipe, convection tube bundle, smoke pipe, downcomer, header, superheater, economizer and other pressure parts, which form a complete water and steam system for heating and vaporization. The furnace is composed of combustion equipment, furnace wall, furnace arch and steel frame It makes the fuel burn to produce hot flue gas. The flue gas releases heat to the heating surface of the boiler through the furnace and various flue sections, and then enters the chimney from the tail of the boiler

Other important auxiliaries:

Coal crusher, coal conveying device, forced draft fan and pipeline, water supply device, sewage system, water treatment equipment and pipeline, dust removal and ash removal system, slag conveying device, control system, etc

Accessory instruments:

Safety valve, water level gauge, pressure gauge, thermometer, flowmeter, pressure and water level audible and visual alarm device, interlocking protection device, etc. Valves mainly include main steam valve, blowdown valve, check valve, etc.

Boiler selection calculation and operation cost calculation

Conversion of calorific value and weight unit

1. 10000 kcal = 10000 kcal (kcal) = 10000000 kcal (CAL) = 418518, 2 joules (J);

2. 10000 kcal ≌ 11,6 kW example: 24 KW electric boiler is about 20000 kcal;

3. 1kg = 1kg = 0,001 tons, e.g. 500kg, which is commonly referred to as 0,5 tons.

Relevant regulations and national standards to be followed in boiler type selection calculation and engineering calculation

1. Regulations on Technical Supervision of small and atmospheric hot water boilers

2. Safety management regulations for boiler room

3. Interim Regulations on safety supervision of boilers and pressure vessels

4. Code for design of building water supply and drainage (GB / t50015-2003)

5. Design Manual of building water supply and drainage

6. National technical measures for civil construction engineering design (water supply and drainage)

7. Standard for basic language of water supply and drainage design (gbj125-89)