(
one
LECOS
System brief
development team
LECOS
The gas combustion optimization system is developed by professors and Bo and master research and development teams from California State University, Beijing Tsinghua University and Taipei University with rich experience in energy conservation.
2012
Introduced by Nanjing Leading Talents ("
321
The “plan†is introduced into China and is the top industrial control and energy-saving technology research and development team in China. It has the ability to independently design and develop products that fully meet user requirements according to the actual needs of users and on-site conditions.
Features
LECOS
The system is applicable to all kinds of gas and other burning equipment. Its modular configuration scheme and self-learning algorithm allow industrial enterprises to rationally configure management schemes according to their own conditions.
Its features include:
â—†
Adapt to different operating modes, such as multiple configurations for different types of applications
DCS
, manual control, etc.;
â—†
High-precision parameter real-time measurement and data acquisition and management functions;
â—†
Appropriate human-computer interaction;
â—†
Self-learning fast optimization response algorithm and sensitive control to achieve optimal air-fuel ratio;
â—†
Integrate multiple combustion control programs and
PID
Load regulation function;
â—†
Monitoring and display of combustion efficiency and power;
â—†
Threshold alarm and bypass control design ensures that system failures do not affect production;
â—†
Potential fault diagnosis function;
â—†
Historical data tracing and reporting capabilities.
System Components
LECOS
System by
LECOS
Control box host module, combustion equipment operation parameter monitoring module, high-precision air volume measurement module, remote sensitive module module, master control
DCS
And running personnel application platform module and data management traceability and reporting function modules.
LECOS
The host module is the core of the system, based on the development of high-speed computing core chips, integrating parameter acquisition monitoring, response algorithms and decision logic functions;
The combustion equipment operating parameter module is equipped with high-precision air volume sensor, duct pressure measurement, duct temperature measurement, fuel metering, flue gas temperature measurement, flue gas composition monitoring and other parameter measurement sensing equipment according to user requirements; high-precision air volume measurement module by
LEFM
The series of anti-blocking array type measuring devices are used to solve the problem of excessive uncertainty of the air volume measurement in the boiler;
Master control
DCS
And the operator application platform provides
LECOS
The system interfaces with the operational management system and provides the necessary alarm and operational guidance functions;
The Data Management Traceability and Reporting function module is used to manage, display, store and export historical and real-time data to meet the needs of industrial enterprises for data applications.
(II) LECOS combustion optimization implementation
General description:
Fast tracking and fuel through load
/
The air volume is finely controlled to ensure sufficient combustion while reducing the excess air coefficient, thereby achieving the purpose of reducing the heat loss of the exhaust gas and improving the efficiency of the combustion furnace.
Expected goals:
Achieve the excess air coefficient of the boiler
1.05
The goal. Excess air ratio per reduction
0.1
, the amount of burning smoke is reduced
6.5%
, the heat loss of exhaust smoke is reduced by about
0.6%
At present, the excess air coefficient of gas boilers is usually
1.2
the above,
LECOS
System application improves efficiency
1%
Above, the specific effect is determined according to the working conditions.
Application object:
Various types of gas boilers
Method to realize:
LECOS
Control box (microprocessor control board)
+
Peripheral equipment (gas analyzer, zirconia oxygen sensor, gas
/
Air flow meter, pressure sensor, temperature sensor, fast response actuator).
Functional elements:
Electronic ratio modulation technology
+
Humanoid intelligent adjustment (self-learning).
Adjustment logic (main):
LECOS
The electronic ratio modulation technology adopts dual subsystem control logic, including load automatic tracking adjustment system and flue gas oxygen amount adjustment system, and adopts cascade adjustment and optimization algorithm to realize adjustment function.
(1)
The load tracking adjustment system control logic outer ring is calculated according to the information given by the boiler's own load meter (steam pressure or hot water temperature), combined with the flow rate and other information to obtain the theoretical fuel quantity value, overcoming the target value change caused by the load disturbance, and controlling it. At a given value; the inner ring is based on a fuel analyzer (online
/
Stage) uses the given calorific value information and fuel pressure information to overcome the internal disturbance caused by fuel fluctuations according to the furnace temperature adjustment control.
(2)
The outer ring of the flue gas oxygen regulation system obtains the theoretical air amount according to the fuel quantity by the air-fuel ratio, and serves as the first-stage target value for adjusting the air volume regulating valve or the blast baffle; the inner ring is adjusted according to the online oxygen amount of the furnace to make the smoke The oxygen content of the gas is maintained at a given value (set the oxygen content of the flue gas and set the air/fuel ratio according to the gas composition).
LECOS
The human-like intelligent adjustment adopts the advanced self-learning human-like intelligent control algorithm. It does not rely on the mathematical model of the control object and performs real-time control according to the empirical behavior. It is superior to the traditional in terms of rapidity, stability and robustness.
PID
control. The system manually records the operating parameters of the boiler such as load, fuel, air volume, etc., and then analyzes the self-learning algorithm through data mining technology to obtain the optimal control behavior and convert it into the basis of subsequent operation control.
(III) Application of LECOS system in oil and gas field water jacket heating furnace
Heating furnace status
The water jacket heating furnace is an indispensable heating device in the oil and gas production process of oil and gas fields. It is used for energy supply of oil and gas field product heating and gathering systems. Usually, natural gas is used as fuel. The combustion heats the water in the water jacket and then passes through the hot water. Heat the oil (or gas) in the oil line to the specified temperature. At the same time, the water jacket heating furnace is one of the largest self-consumption fuel equipment in oil and gas fields, and its efficiency directly affects the technical level, energy saving and economic benefits of oil and gas field production.
At present, the oil field heating furnace usually uses a skid-type water jacket heating furnace, and the combustion method is mostly negative pressure combustion (partially using positive pressure combustion), that is, the air required for the combustion process is a natural air inlet, and the air inlet amount is manually set by the damper opening degree. Adjustment is made, the fuel intake amount is adjusted by the intake valve, and the adjustment target is the oil pressure before the heating tube
/
Temperature and pressure after heating tube
/
Oil temperature. The figure below shows a typical water jacket body structure.
Since the negative pressure combustion is not equipped with a blower, the air is sucked in by the negative pressure generated by the gas, the air intake air volume is difficult to accurately control, and the mixing degree of the gas and the air is insufficient, and the flame temperature of the burner is not high, the radiation intensity is low, and the combustion efficiency is lowered. . Insufficient air intake when the gas intake is high leads to insufficient combustion. The low temperature of the pipe not only causes the heat transfer efficiency to decrease due to the small temperature difference with the water jacket, but also causes corrosion and perforation of the pyrotechnic system due to electrochemical corrosion of the condensate, which affects the service life of the furnace. When the gas intake is low, the intake air volume is too high and the excess air system is too large, which causes the exhaust gas temperature to rise, the exhaust heat loss to increase, and the fuel consumption to increase. The chimney of the heating furnace is usually high and thus has a strong pumping force. The excessive excess air sucked in causes the efficiency of the heating furnace to occur frequently, and the influence is more serious when the heating load of the heating furnace is small.
At present, most of the water jacket furnaces in oil and gas fields are not efficient, and the average thermal efficiency is only
52%~60%
Low efficiency means high gas consumption and affects the cost of production.
LECOS system application
LECOS
The application of the system aims to improve the efficiency of the furnace by ensuring that the fuel is fully combusted while reducing the heat loss of the flue gas.
In the case of better gas quality, the blue flame can be obtained when the manual air intake is adjusted, which is the control method commonly used in heating furnace control. However, the quality of the fuel gas used in the oil field is usually poor, so it is difficult to adopt the color as the standard adjustment method. The operator usually needs to observe the sound and the overall situation of the flame and adjust the incoming air according to experience, resulting in excessive dependence on experience and differences in control levels.
LECOS
The system is provided with a temperature sensor in the inlet and outlet of the heating tube of the heating furnace and the water bath of the casing, so that the burner automatically adjusts the output load according to the required heat load to adjust the gas intake amount; and the residual oxygen content of the flue gas is monitored by the flue gas oxygen sensor. Control the air-fuel ratio to fully burn the fuel and reduce the amount of flue gas and heat loss from exhaust, improve burner efficiency and reduce fuel consumption.
For different oil and gas field water jacket heating furnace status,
LECOS
Provide different application methods:
(
1
For a negative pressure combustion water jacket heating furnace,
LECOS
Supporting fast and sensitive operation module allows automatic control of the damper on the natural wind inlet side, according to the temperature
PID
The control realizes the automatic calculation of the gas demand and automatically optimizes the control of the gas intake air quantity, and adjusts the damper opening degree by the flue gas oxygen content to realize the combustion optimization control. According to the operation experience, the method can control the excess air to
5%
To achieve natural gas use savings
5~15%
. Simultaneously,
LECOS
The system's automatic air distribution control module allows the user to achieve positive pressure combustion by adding a blower to the negative pressure combustion furnace to improve heating efficiency.
(
2
For a positive pressure combustion water jacket heating furnace, since the furnace itself is equipped with a blower and has primary air mixing and secondary air combustion,
LECOS
System through temperature
PID
Control and gas analysis
/
The air-fuel ratio control realizes the automatic load tracking control and automatic combustion optimization of the heating furnace, reduces the operating pressure of the operating personnel and improves the efficiency of the heating furnace. According to the operating experience, this method can further realize the use of natural gas.
3~8%
.
LECOS
It allows modular configuration according to the actual needs of the target users, such as selecting the gas component analysis and temperature control to realize the automatic control optimization function, and selecting the oxygen sensor to realize the air-fuel ratio control function.
According to the application prediction of oil and gas field water heater, application
LECOS
The payback period for system applications is
1
Within the year, usually
6~8
Months.
(4) ECOS gas energy saver for LECOS system
ESA Gas Energy Saver Description
LECOS
System supporting application
ESA
Multi-pole fuel environmental protection energy saver by the United States
ACME
The company developed and used a multi-pole alloy rod coating nano-catalyst to form a high-frequency resonant magnetic field to treat the fuel intake, and to improve the mixing degree of gas and air by refining the fuel molecular group, thereby improving gas combustion sufficiency and reducing excess air coefficient. Improve the purpose of combustion efficiency.
ESA
Multi-pole fuel environmental protection and energy saving device is very simple to operate, no need for personnel or equipment
control. The equipment is installed in front of the fuel line pressure reducing valve and the nozzle. When the fuel passes through the equipment, only the physical properties of the fuel are changed because no material is added or removed. In use, a bypass pipe is installed and installed before each fuel nozzle. Valve (can be carried out without maintenance during maintenance).
Water jacket heating furnace supporting application
Water jacket heating furnace application
LECOS
System can be used together
ESA
Multi-pole fuel economizer, processed gas combustion through
LECOS
The automatic control system realizes optimal adjustment, which can further improve the combustion efficiency, and the gas saving amount can be
LECOS
A conservative estimate based on the system can increase
1~3%
.
Disposable Vape,Vape Pod,Electronic Vape Pod,Electronic Cigarette
KENNEDE ELECTRONICS MFG CO.,LTD. , https://www.axavape.com