Boiler and the method for controlling combustion of the boiler

Patent metadata

Field	Value
Publication number	US-11614258-B2
Application number	US-201916709395-A
Country	US
Kind code	B2
Filing date	Dec 10, 2019
Priority date	Dec 28, 2018
Publication date	Mar 28, 2023
Grant date	Mar 28, 2023

Abstract

The present invention relates to a boiler which determines a clogging degree of an exhaust flue through which combustion gas is discharged and adjusts gas supply amount to maintain its combustibility, and a combustion control method thereof, the method of the present invention including a) setting a target heat value for achieving a target temperature, b) applying a first database on the basis of the target heat value, c) measuring a rotational speed of an air blower and a pneumatic pressure of air introduced by rotation of the air blow, d) applying a second database on the basis of a rotational speed difference, a pneumatic pressure difference, and the target heat value to calculate an estimated flue clogging value according to the target heat value, and a) applying a third database according to the estimated flue clogging value to calculate an opening amount of a gas valve and control gas supply amount.

First claim

What is claimed is:

1. A combustion control method of a boiler provided with an air blower configured to rotate such that air and gas are introduced, a gas valve configured to adjust an opening or closing degree of a gas supply pipe into which gas is introduced, and a controller configured to control the air blower and the gas valve, the method comprising the steps of:
A) calculating an estimated flue clogging value for estimating the degree of flue clogging by comparing a preset target rotation speed of the air blower according to the target heat value with the rotation speed measurement value of the air blower, and simultaneously comparing a preset target air pressure which is the pressure of the air introduced by the rotation of the air blower according to the target heat value with the air pressure measurement value which is the pressure of the air introduced by the rotation of the air blower; and
B) controlling an opening degree of the gas valve with the amount of the gas valve according to the calculated estimated flue clogging value to control a supply amount of gas which is being introduced, thereby adjusting gas ratio inside a combustion chamber and maintaining the combustibility of the boiler.

2. The method of claim 1 , wherein the step A) comprises the steps of;
a) inputting a target temperature of heat or hot water provided by operation of the boiler and setting a target heat value for achieving the target temperature;
b) calculating a target rotational speed of the air blower, a target pneumatic pressure which is the pressure of the air introduced by rotation of the air blower, and a target opening amount of the gas valve according to the target heat value and applying the target rotational speed, the target pneumatic pressure, and the target opening amount to control the air blower and the gas valve;
c) measuring the rotational speed of the air blower and the pneumatic pressure of the air introduced by rotation of the air blower in real time; and
d) calculating a rotational speed difference which is a difference between the target rotational speed and a rotational speed measurement value, calculating a pneumatic pressure difference which is a difference between the target pneumatic pressure and a pneumatic pressure measurement value, and calculating the estimated flue clogging value according to the target heat value, the rotational speed difference, and the pneumatic pressure difference.

3. The method of claim 2 , wherein, in the step b), the controller is configured to calculate the target rotational speed and the target pneumatic pressure according to the target heat value by substituting the target heat value into a first database in which data of the target rotational speed, the target pneumatic pressure, and the opening amount of the gas valve are stored.

4. The method of claim 2 , wherein in the step d), the controller is configured to calculate the opening amount of the gas valve according to the estimated flue clogging value by substituting the estimated flue clogging value into a third database in which data of the opening amount of the gas valve is stored.

5. The method of claim 2 , wherein the estimated flue clogging value and the opening amount of the gas valve are linearly calculated and output using interpolation in which at least two pieces of data which are preset or calculated in advance are represented as a linear equation.

6. A boiler comprising:
a rotational speed measuring section configured to measure a rotational speed of an air blower by which gas and air are introduced;
a pneumatic pressure measuring section configured to measure a pneumatic pressure which is a pressure of air introduced through the air blower; and
a controller configured to calculate an estimated flue clogging value for estimating the degree of flue clogging by comparing a preset target rotation speed of the air blower according to the target heat value with the rotation speed measurement value of the air blower, and simultaneously comparing a preset target air pressure which is the pressure of the air introduced by the rotation of the air blower according to the target heat value with the air pressure measurement value which is the pressure of the air introduced by the rotation of the air blower and to adjust an opening degree of the gas valve with the amount of a gas valve according to the calculated estimated flue clogging value to control a supply amount of gas which is being introduced, thereby adjusting gas ratio inside a combustion chamber and maintaining the combustibility of the boiler.

7. The boiler of claim 6 , wherein the controller is provided with a data storage section in which data is stored,
wherein the data storage section comprises:
a first database comprising a target rotational speed, a target pneumatic pressure of the air blower, and a target opening amount of the gas valve for generating a target heat value; and
a second database comprising the target heat value, a rotational speed difference which is a difference between the rotational speed and the rotational speed measurement value of the air blower, a pneumatic pressure difference which is a difference between the target pneumatic pressure of the air blower and a pneumatic pressure measurement value of air which is introduced by rotation of the air blower, and the estimated flue clogging value according to the target heat value, the rotational speed difference, and the pneumatic pressure difference.

8. The boiler of claim 7 , wherein the data storage section further comprises a third database that is stored in the storage section and comprises the estimated flue clogging value and the opening amount of the gas valve according to the estimated flue clogging value.

9. The boiler of claim 6 , wherein the controller comprises a data calculating section configured to linearly calculate and output the estimated flue clogging value and the opening amount of the gas valve using interpolation in which at least two pieces of data which are preset or calculated in advance are represented as a linear equation.

Assignees

• Kyungdong Navien Co Ltd

Inventors

• Choi Hyuk

Classifications

• F23N2233/08

  with variable speed · CPC title

• F23N2225/04

  pressure · CPC title

• F23N1/022

  using electronic means · CPC title

• F23N2231/28

  preventing flash-back or blow-back · CPC title

• F23N1/042

  using electronic means · CPC title