JPS62218489A - Production of mimic gas - Google Patents

Abstract

PURPOSE:To obtain a mimic gas having a low impurity content and excellent combustion stability at low cost in a large amt., by burning a fuel which is inexpensive and easily available in an air lean state to obtain a high-temp. gas, allowing the high temp. gas to cool, and adding only a deficient component gas in the form of a gas to the cooled gas. CONSTITUTION:A fuel F, such as gas oil, which is inexpensive and easily available, and air A are fed in an air ratio of 1 or less, i.e., in an air lean state, into a combustion oven 1, where the fuel is partially burnt. A high-temp. gas thus formed is passed through a cooler 2, a heat exchanger 3, and a cooler 4 to allow it to cool at ambient temp. After the removal of impurities, e.g., water, the gas is transferred to a mixer 5. On the other hand, a deficient component gas (e.g., CO) is fed into a mixer 5 through a gas component detector 6 which detects the properties of the high-temp. gas and the gas from the mixer 5, compares the data thus obtd., and calculates and instructs the amount of a deficient component gas, thereby obtaining a mimic gas of an intended low- calorie gas. This gas is heated in a heat exchanger 3 to a temperature corresponding to a coal gasification gas and used in a boiler, a gas turbine, etc. as a mimic gas for combustion tests.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for creating a simulated gas that is necessary when conducting combustion experiments using this type of gas in the development of low-calorie gas combustion boilers or gas turbines. Concerning generation methods.

[Conventional technology]

In recent years, energy conservation and cost reduction have been significantly promoted, and fuels have become more diverse. Namely.

Blast Furnace Gas 5 Low-calorie gases such as coke oven gas, converter gas, old method gasification gas, and chemical process byproduct gas are often combusted in boilers or gas turbines.

These low calorie gases generally have low combustion stability and often contain impurities such as ammonia NH3.

Therefore, when developing combustion equipment for these low-calorie gases, it is required to maintain high flame stability and combustion efficiency while suppressing the amount of NOx emissions that are polluting exhaust from impurities such as NH3. It was necessary to conduct combustion experiments using these low-calorie gases.

[Problem that the invention seeks to solve]

However, since these low-calorie gases are only available in small amounts near the source, there is a problem in that it is difficult to conduct combustion experiments using large amounts of low-calorie gases in order to develop combustion equipment.

[Failure to solve the problem]

In the present invention, by burning relatively inexpensive and easily available fuel such as kerosene and light oil in an air-deficient state,
Generates high-temperature gas that is rich in nitrogen and contains carbon monoxide, hydrogen, and moisture, which are often included in low-calorie gases.
After adjusting the hydrogen content and moisture concentration by adjusting the air ratio and cooling the high-temperature gas, by adding the insufficient gas components to the high-temperature gas as appropriate, a fuel gas with components similar to the target low-calorie gas can be obtained. did.

[Effect]

For example, when light oil is combusted with an air ratio of 1 or less, that is, in a state of insufficient air, gas with a high hydrogen content is produced as shown by the chemical formula below.

Cml capture + 02 + N2 → CO + CO □ 10 Hz O + H
2+N2 obtained co, co□, H20, H2, N
The content percentage of each of 2 differs depending on the combustion conditions.

For example, Co: 10%, CO2: 5%, H2O: 5%1
H2: 5%, N2 near 5%, total required CO
If the content of is 15%, there will be a shortage of 5%. Therefore, this shortage is supplemented by injecting gas into the mixer section to obtain a desired simulated gas state.

〔Example〕 FIG. 1 is a schematic diagram showing one embodiment of the present invention.

In this example, a simulated gas of one coal gasification gas was generated using light oil as fuel.

First, air A and light oil F were supplied to the combustion furnace 1 and partially combusted at an air ratio of 1 or less to produce a hydrogen-rich gas.

In chemical formula, CmHn + 02 10N2 →
Co + CO2 + H20 + H2 + Ni, depending on combustion conditions, co, co□.

The relationships in which H, O, H, , N are included are different.

This hot gas is then transferred to the cooler 2. Heat exchanger 3. It was cooled to room temperature through a cooler 4, and moisture was removed.

Then, after adding carbon monoxide, which was insufficient due to the properties of the target gas, in the mixer 5, the gas was heated in the heat exchanger 8 to a temperature equivalent to that of coal gasification gas. In addition, 6 detects the gas properties from the combustion part and the gas properties from the mixer 5.
This is a gas component detector that compares and commands to calculate the amount of gas shortage.

〔Effect of the invention〕

The method of the present invention has made it possible to obtain various target simulated gases in large quantities and at low cost. Therefore, in the past, combustion tests using simulated gas could only be carried out in the vicinity of where the gas was generated, and the installation or relocation of combustion test equipment required a great deal of expense. The present invention is useful for the development of industry as it becomes possible to obtain simulated gas and contributes to the development of low calorie gas combustion equipment.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing one embodiment of the present invention. l... Combustion furnace, 2... Cooler 2 B... Heat exchanger, 4... Cooler, 5... Mixer, 6... Gas component detector. Kumasa

Claims (1)

[Claims] A simulated gas generation method characterized by burning fuel in an air-deficient state to generate high-temperature gas, and then cooling the high-temperature gas and adding only the deficient component gas with the required gas properties.