JPH0868504A - Suspended combustion in furnace for generating small quantity of nitrogen oxide - Google Patents

Abstract

PURPOSE: To provide a combustion method in a furnace for generating a small quantity of nitrogen oxides in which furnace temperature can be made uniform and the generation of nitrogen oxides can be controlled to be low. CONSTITUTION: A furnace casing 1 comprises a heat accumulating part, an alternately suspended combustion burner including two burner parts A and B as one pair, each having an air blow-off part 3 and several gas blow-off parts. which are alternately selectively burnt. When the respective burner parts A and B are alternately selectively burnt, gas is blown off simultaneously from all of the several gas blow-off parts, or selectively therefrom, and burnt. In order to make a furnace temperature distribution even, the gas is blown off simultaneously from all of the gas blow-off parts, or from the selectively and sequentially instructed gas blow-off parts. Otherwise, the furnace temperature distribution is measured and the gas is sequentially blown off from positions where temperature is low. Such an alternately suspended combustion is carried out by alternately switching the two burner parts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for floating combustion in a nitrogen oxide low-production reactor.

[0002]

2. Description of the Related Art As one of combustion methods for suppressing the generation of nitrogen oxides, there is a slow combustion method in which gas and air are separately jetted into a furnace, and floating combustion is carried out while the gas in the furnace is accompanied. Conventionally,
As one means for carrying out such a slow combustion method, an alternating floating combustion method in which two burner sections having a heat storage body and an air ejection section are installed in a furnace body as a set, and they are alternately switched to carry out switching combustion There is.

[0003]

In the above-mentioned alternating floating combustion method, since floating combustion is carried out in the furnace, flame does not adhere to the burner, that is, there is no flame holding mechanism, so the temperature near the burner is low. Therefore, there is a problem that the temperature distribution is not good. Especially, when the furnace length is long, this tendency becomes strong.

[0004]

In order to solve the above-mentioned problems, the present invention has an alternating configuration in which two burner parts A and B each having a heat storage part and an air ejection part are alternately switched and burned as one set. Each of the burner parts A and B of the floating combustion burner is provided with several gas ejection parts and installed in the furnace body.
When these are alternately switched and burned, the gas is jetted from all of the several gas jetting portions at the same time or selectively and burned.

Further, the present invention is characterized in that the respective gas jetting portions of the respective burner portions burn in different jetting directions.

Further, the present invention measures the temperature distribution in the furnace,
Gas is ejected selectively from the place where the temperature inside the furnace is low,
It is characterized by burning.

[0007]

In order to make the temperature distribution in the furnace uniform, the gas is spouted from all of the gas spouts simultaneously or from the gas spouts that are selectively sequentially ordered. Alternatively, the temperature distribution in the furnace is measured, and the gas is sequentially ejected from the low temperature part to burn. Alternate floating combustion is performed by alternately switching such combustion with two burner sections.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference numeral 1 is a furnace body, and burner portions A and B which can be attached to both sides of the furnace body 1 have a heat storage body 2 and an air jet portion 3, and a large number of gas jets. It is a burner section having a section. The burner portion A is provided with the heat storage body 2 and a large number of gas ejection portions A1 to A4, and the burner portion B is also provided with the heat storage body 2 and a large number of gas ejection portions B1 to B4. . The gas ejection portion A-B5 in the central portion is a constant gas ejection portion that constantly ejects gas. The gas ejection portions A1 to A4 and B1 to B4 have different ejection directions, for example, as illustrated. Now, when air is ejected from the air ejection part 3 having the heat storage body 2 of the burner part A and the gas is ejected from the gas ejection parts A1 to A5, the gas and the air are mixed while the gas in the furnace 4 is accompanied, In 4 of them, a slow and slow combustion flame is generated. Since such a combustion flame does not have a special high temperature part, the generation of nitrogen oxides is suppressed to a low level. The combustion exhaust gas is emitted from the air ejection portion 3 of the burner portion B.
And the sensible heat is recovered in the heat storage body 2 of the burner B while being discharged.
After performing such combustion, for example, for 60 seconds, the burner unit A
And the burner section B is burned. In the burner section B, the same combustion as in the burner section A is executed. At the time of such combustion, from the constant gas ejection portion A-B5 in the central portion,
Ejecting gas.

In order to make the temperature distribution in the furnace uniform during the above-mentioned combustion, for example, all of the gas ejection portions A1 to A5 are simultaneously or selectively ordered to instruct the gas ejection portion A1.
Gas is jetted from A5 to A5 and burned. Alternatively, the temperature distribution in the furnace is measured, and the gas is sequentially ejected from the low temperature part to burn. That is, the combination is, for example, as follows. Example 1 A1 → B1 → A2-B2 → A3 → B3 → A4 + A5 → B
Return to 4 + B5 → A1 and repeat. Example 2 B1 + A2 → B1 + B2 → A2 + A3 → B2 + B3 → A
1 + A2 → A4 + A5 → B4 + B5 → Repeat below. Although two examples have been described above, various combined combustions can be selectively executed, and this may be executed by focusing on the low temperature by measuring the furnace temperature.

[0010]

EFFECTS OF THE INVENTION Since the present invention is as described above, the temperature distribution in the furnace becomes substantially uniform, and uniform heating can be performed.
It is possible to obtain a high-quality product in which the quality of the object to be heated is even. At the same time, since the gas is jetted in multiple divisions, the slow combustion is further promoted and the generation of nitrogen oxides can be suppressed to an extremely low level.

[Brief description of drawings]

FIG. 1 is a plan explanatory view of the present invention.

[Explanation of symbols]

 1 Furnace Body 2 Heat Storage Body 3 Air Ejection Part 4 Inside Furnace A1 to A4 Gas Ejection Part B1 to B5 Gas Ejection Part A-B5 Always Gas Ejection Part

Claims (3)

[Claims] 1. A gas jetting portion of each of the burner portions A, B of an alternating floating combustion burner which has a heat storage portion and two burner portions A, B having an air jetting portion as a set to alternately switch and burn. Several burner units A and B are installed in the furnace body.
When alternately switching and combusting, a method for floating combustion in a low-nitrogen-oxide-producing reactor, characterized in that the gas is ejected at the same time from all of the several gas ejection parts or selectively and burned. 2. The method for floating combustion in a low-nitrogen oxide reactor according to claim 1, wherein each gas ejection portion of each burner portion burns in a different ejection direction. 3. The method of floating combustion in a low-nitrogen-oxide-producing furnace according to claim 1, wherein the temperature distribution in the furnace is measured, and the gas is sequentially and selectively ejected from a location where the temperature in the furnace is low to perform combustion.