KR20080101804A - Using exhaust gas analysis of lng industrial boiler - Google Patents

Abstract

A fuel ratio control and continuous water supply system of an industrial boiler using LNG can improve the combustion efficiency through the quick fuel ratio control and cut down on the management cost by using an automatic input water supply inverter. A fuel ratio control and continuous water supply system of an industrial boiler using LNG comprises an exhaust-side oxygen sensor(1) measuring the real-time amount of oxygen included in exhaust gas; a microcomputer(2) calculating an air supply quantity proper for combustion and an inverter value for blower operation; a fuel ratio control unit including a blower motor(3); a water level sensor(4) which appoints the water levels of five electrode rods set up in a drum and storing in a memory; a pipe pressure sensing sensor(5) sensing inner pressure of the drum in real time; a pipe temperature sensor(6) sensing inner temperature of the drum in real time; a burner load sensor(7) measuring burner load; a continuous water supply unit inputting collective information from each sensor to the microcomputer via the memory unit, calculating the water supply inverter value corresponding to the collective information, and driving a water supply pump; and a microcomputer device controlling the units to fit the boiler operation condition.

Description

Fuel economy control and continuous water supply system for industrial boilers using LNC {USING EXHAUST GAS ANALYSIS OF LNG INDUSTRIAL BOILER}

The present invention in the industrial boiler using LNG as a fuel, by improving the fuel efficiency control method and continuous water supply method to shape the combustion efficiency through rapid fuel economy control and improve the water supply method with automatic input water supply inverter to lower the operation management cost I wanted to get a boiler.

All industrial boilers are set and inspected according to the values required by the Energy Management Corporation during commissioning to adjust the fuel efficiency of the burner. However, the operating conditions of the boiler are not always the same, so the burner's air-fuel ratio is different. It can be seen that the burner's combustion efficiency changes, and if it is severe, gas and air lines can be blocked and soot will be generated in the boiler within a short time.

As a result of the soot, it is currently operating with the risk of lowering the combustion efficiency such that the boiler cannot be operated.

In addition, automatic water supply control methods are known to maintain good steam dryness.

However, the automatic water supply method developed to maintain the steam dryness, the inverter operates only at a fixed value when the water level is out of a certain level, so the boiler pressure is increased differently from the beginning, so it is inconvenient to adjust precisely when operating.

The present invention seeks to obtain an industrial boiler using LNG that has high efficiency, high system maintenance and low cost by developing fuel efficiency control means and water supply method corresponding to a boiler operating environment quickly.

The present invention was developed to solve the above-mentioned problems in the prior art by installing an oxygen sensor in the exhaust gas exhaust portion in real time to analyze the oxygen amount of the exhaust portion and input the information to the microcomputer to supply the air supply required for the current stage of combustion The optimum fuel economy can be maintained by properly calculating and supplying the fuel consumption, and the burner load rate, the pressure in the tank and the temperature in the tank are sensed in real time, and the information is input to the microcomputer through the memory to calculate the water supply inverter value. By supplying water, automatic water supply is made to quickly respond to environmental changes in boiler operation, thereby obtaining a high efficiency and low cost boiler.

In the present invention as described above, when the water supply in the drum changes due to the use of a boiler, the water level sensing electrode detects the corresponding water level, inputs a signal into the memory, and simultaneously detects the internal pressure of the water tank by a pipe pressure sensor that senses the internal pressure of the water tank. Inputs a signal into the memory and senses the current temperature inside the tank, inputs a signal into the memory, and burns the burner load rate in real time. It calculates and outputs the current feedwater inverter value according to the level, so that continuous water supply corresponding to the pressure change is achieved automatically without the need to adjust the input value for each electrode level, and the oxygen sensor is installed in the exhaust gas outlet to detect the amount of oxygen discharged in real time. Is inputted to the microcomputer and the air supply for the current situation is calculated. Blower so calculated output value of the inverter is automatically adjusted to a given wind speed, air volume, wind pressure value is supplied to a feeding amount for the predetermined combustion efficiency.

Therefore, the optimum combustion efficiency can be achieved and stable operation can be achieved. The supply of air supply and water supply can be maintained by the microcomputer system, so that it is easy to grasp the current status and the maintenance cost is low.

The present invention is equipped with an exhaust oxygen sensor (1) to exhaust the exhaust gas to measure the amount of oxygen in real time and input the signal to the microcomputer (2) to calculate the amount of air supply suitable for combustion and calculate the blower operation inverter value Fuel consumption control means for automatically driving the blower motor 3 to supply the air supply suitable for combustion;

The water level sensor (4) stored in the memory by specifying the electrode level to be divided into ground, low water level, medium water level, high water level, and high water level by installing five electrodes in the drum

Pipe pressure sensor (5) for detecting the internal pressure of the drum in real time and pipe temperature sensor (6) for detecting the temperature of the drum in real time and

A continuous water supply means which is equipped with a burner load rate sensor 7 for measuring burner load rate, inputs comprehensive information sensed by each sensor to the microcomputer through a memory unit, calculates a water supply inverter value according to the comprehensive information conditions, and drives the water supply pump; The means is provided with a microcomputer device to control and control to meet the boiler operating conditions.

1 is an exemplary system diagram of the present invention.

Figure 2 is an illustration of the continuous water running of the present invention

3 is an exemplary view of the continuous water supply of the present invention.

* Explanation of symbols on the main parts of the drawings

1: oxygen sensor 2: microcomputer

3: blower motor 4: water level sensor

5: pipe pressure sensor 6: pipe temperature sensor

7: Burner Load Rate Detector

Claims (1)

The oxygen sensor 1 of the exhaust gas is discharged to measure the amount of oxygen in real time, and the signal is input to the microcomputer 2 to calculate the air supply amount suitable for combustion, and the blower operation inverter value is calculated to calculate the blower motor (3). Fuel economy control means for automatically supplying the air supply suitable for combustion by The water level sensor (4) stored in the memory by specifying the electrode level to be divided into ground, low water level, medium water level, high water level, and high water level by installing five electrodes in the drum Pipe pressure sensor (5) for detecting the internal pressure of the drum in real time and pipe temperature sensor (6) for detecting the temperature of the drum in real time and A continuous water supply means which is equipped with a burner load rate sensor 7 for measuring burner load rate, inputs comprehensive information sensed by each sensor to the microcomputer through a memory unit, calculates a water supply inverter value according to the comprehensive information conditions, and drives the water supply pump; Fuel efficiency control and continuous water supply system for industrial boilers using LNC, which is equipped with a microcomputer so that the means can be controlled and managed according to the boiler operating conditions.

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