Taibang Share - Slag pump ZYB-3 / 2.0 burner, the burner dry gas boiler industry applications - automatic fuel to air ratio regulation ratio: save money, environmentally friendly
I. International and domestic trends in combustion systems and controls:
1. European and American countries that represent the world's advanced combustion technology - safe, efficient, environmentally friendly, and automatic.
The burners are equipped with differential, integral calculation or more complex operation adjustment instruments (for example: proportional regulator, PLC, large computer control, etc.), through the boiler water temperature, steam pressure, steam flow, oxygen content in the flue gas The boiler water supply system and other factors are detected, and the fuel quantity and the distribution air volume are continuously and dynamically adjusted. In a word, the combustion conditions can be synchronized continuously and continuously with the changes in boiler operating conditions and smoke emissions to achieve efficient and environmentally friendly results.
ZYB residual oil pump EU burner standard requires that the burner must have: wind pressure detection, flame detection, flameout protection, gas high pressure protection, gas low pressure protection, gas leakage protection, exhaust temperature protection, etc., also requires burner and boiler super Interlocking protection for pressure, over temperature, water level, continuous water supply, exhaust gas temperature, etc., any burner failure, the burner must stop running at the same time.
2. Domestic status and development trend of ZYB-B adjustable pressure residue oil pump
At present, there are three types of combustion systems: full-hand operation, fully automatic position, and fully automatic proportional adjustment.
Hand-operated: This type of combustion means that fuel or gas is mixed with a fixed flow rate and air at a fixed flow rate. It is mainly distributed in major oil fields such as Daqing, Shengli, Liaohe, and the west. The fuel is mainly crude oil, and some are mainly Heavy oil; this is a kind of combustion method with only heavy combustion effect and heavy operation cost, resulting in a large amount of energy waste and safety accidents; in the new situation dominated by market economy benefits, such combustion systems are gradually being used by savvy users. Abandon, for example: the 40T steam boiler of the Shenghua Refinery of the University of Petroleum (Dongying). After a rigorous argumentation, it decided to adopt an advanced combustion system - imported oil and gas hybrid burner.
Fully automatic position: ZYB adjustable pressure residue oil pump This combustion system has all automatic and safety protection functions, but the fuel and air adjustment is one-stage, two-stage or three-stage adjustment, suitable for small boilers or industrial furnaces.
Fully automatic proportional adjustment: using proportional regulator, PLC, DCS, BLM, etc. to achieve the fuel and air mixed combustion logic operation ratio, truly to complete combustion, maximize energy conservation and protect the environment. Typical examples in China: 6 sets of 114MW boilers in Beijing Shuangyushu Thermal Power Plant, 35T boilers in Shanghai Jinshan Petrochemical, 35T boilers in Tianjin Coking Third Plant, and 40T steam boilers in Shenghua Refinery.
The use of energy and ZYB heavy oil coal tar special pump protection environment is an important issue in the 21st century national policy of sustainable development. With the advancement of scientific development awareness and concept, advanced combustion systems are being promoted and applied.
3. The Industrial Boiler Association is entrusted by the relevant state departments to draft the "Automatic Control Standard for Fuel Gas Boilers". This standard refers to the European Union's standard requirements for burners and boilers and will be tested in the second half of 2004. A large-scale safety inspection of fuel gas boilers will be formed throughout the country.
Second, the proportional adjustment of the combustion system economic benefits:
1. High-efficiency and energy-saving operation mode of heavy oil pump boiler: Under the condition of meeting technical requirements, continuous operation with low load as much as possible. That is to save operating costs and extend the life of the boiler. This mode of operation and advantages have long been confirmed and promoted by many users and experts in Beijing. This alone can save 8-15% energy, and only the proportional adjustment combustion system can achieve this mode of operation.
2. Combustion efficiency: 99.9%, ie: complete combustion. (The full-handed combustion system cannot be adjusted according to the complex changes of the load and the change of the oxygen content of the flue gas. According to experience, the combustion efficiency is generally around 85%)
3. Several parameters that affect complete combustion:
3.1 KCB gear oil pump combustion air temperature and flow rate
3.2 The consumption and excess coefficient of combustion air, for example, natural gas consumes 8.4-9.9 cubic meters per cubic volume, the excess coefficient is 1.05-1.2, and the heavy oil theoretically consumes 10.6 cubic meters of air per kilogram.
3.3 Flue gas flow rate and flow rate
3.4 Type of fuel, jet speed, spray angle, calorific value, composition, etc.
3.5 Structure of the boiler
4. Calculate the fuel consumption per ton of steam with heavy oil as an example:
4.1 The heating value of heavy oil is generally 9700Kcal/kg.
4.2 When the coal tar pump superheated steam is 350 °C and 15kgf/cm2, its calorific value is 3139KJ/kg; therefore, the calorific value of 1T steam is:
Q=3139×1000/4.2=74.7×104kcal
4.3 The boiler thermal efficiency is 90%, and the fuel consumption per ton of steam is:
w=74.7×104kcal÷9700÷0.9÷99.9%=86.1kg
5. Comparison of economic benefits of hand-operated combustion systems:
5.1 Hand-operated combustion system uses heavy oil as an example of fuel consumption per ton of steam:
w=74.7×104÷9700÷85%÷90%=100.7kg
5.2 Saving fuel: 1 ton of steam saved by one ton of steam
(100.7-86.1) ÷100.7×100%=14.5%
5.3 20T steam boiler saves fuel in the year, taking heavy oil as an example: 200T steam per day, 300 days of operation
200×14.6×300=876000kg=876T
5.4 Annual savings of 876 tons of heavy oil, 1,500 yuan per ton, 1500 × 876 = 1314000 = 13.14 million yuan
6. Damage and cost increase caused by incomplete combustion:
6.1 ZYB high-pressure gear pump does not completely burn heavy oil, and carbon black is formed in the flue gas. Because the burning of high-molecular hydrocarbons is relatively difficult, if the air supply is insufficient or the oil particles are not mixed with air, there will be some high-molecular hydrocarbons. Cracking occurs under high temperature and anoxic conditions, and carbon black is decomposed. Carbon black is a solid particle with a particle size of less than 1 μm. Its chemical properties are inactive and slow to burn, so once carbon black is produced, it is not easy to burn out. The burnt carbon black will enter the flue gas, causing the chimney to emit black smoke.
The bitumen component in heavy oil is also decomposed into solid oil coke due to lack of oxygen. After the oil coke is broken, it becomes coke, and the latter is also not easy to burn. Thus, an important problem in the combustion of heavy oil is that the air required for combustion must be supplied in time.
6.2 Incomplete combustion of heavy oil, the resulting fly ash, carbon black, coke particles and similar tar substances will be mixed and attached to the water wall or convection tube bundle, forming a layer of thermal insulation for a long time, greatly reducing the thermal efficiency of the boiler. The boiler is cleaned, which increases operating costs and causes uneven heating of the boiler, which shortens the life of the boiler.
6.3 hand-operated combustion system is a primary air and can not be automatically adjusted, which will cause high temperature zone of the flame root, and strong heat radiation, so that the temperature of the oil nozzle will rise, and the high temperature of the heavy oil will cause carbon to precipitate, thus blocking the nozzle. Large nozzle wear and accelerate the damage of the spray gun, resulting in an increase in maintenance costs, which is a great obstacle to the improvement of the production capacity of continuous production enterprises.
Summary: Appropriate amount of air is supplied to different areas in time to avoid carbon black generated by high temperature and oxygen deficiency and to ensure complete combustion of the oil with minimum excess air. The above requirements for the combustion of fuel are achieved by means of a burner. The fuel burner is mainly composed of an oil atomizer and a wind register. The fuel is atomized into fine oil particles by an atomizer, injected into the furnace at a certain atomization angle, and mixed with a flow of air having a shape that is sent through the regulator. The oil atomizer and the air register should cooperate to enable most of the air required for combustion to be supplied from the root of the torch in time, and to adapt the distribution air volume around the torch to the flow density distribution of the oil mist. At the same time, a certain amount of air should be supplied to the tail of the torch to ensure the burning of carbon black and coke particles.
Third, ZYB booster fuel pump several heavy oil combustion methods comparison:
With the world's environmental protection situation and domestic environmental awareness, more and more clean fuels are used. The use of heavy oil as fuel can save more costs than light oil. This is especially true for many units that have associated waste oil. Heavy oil/residue as a fuel generally has the following methods:
·The heat transfer oil pump is below the 60th in the country, and the general mechanical pressure atomization method is used. Most of the burners can be used;
· Domestic No. 100, imported burners can be used for controlling fuel heating by using electronic temperature control devices, and have been successfully applied around the world;
· Domestic heavy oil/residue/crude oil of No. 100 or above, medium atomization or mechanical rotor atomization that must be used;
· RY air-cooled centrifugal hot oil pump medium atomizing burner, using compressed air or steam as atomizing medium, such as imported Oilon;
· Mechanical rotor atomizing burner, mechanical atomization using high-speed rotor.
· Mechanical pressure atomizing burner, using high pressure oil pump for pressure atomization.