JP2001324120A - Waste liquid combustion treatment method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waste liquid combustion treatment device forming the mixed fuel of a waste liquid, water system wastes that are discharged by food industries, automobile industries and other processing industries and liquid fuel and emulsifying it to fine fuel so as to use the waste liquid as combustion improver, thereby contriving the incinerating treatment of the waste liquid through the combustion of the fine mixed fuel, and also permitting the improvement of environment due to the improvement in fuel expenses, the suppression of generation of NOx, the reduction of exhaust gas, etc. SOLUTION: A waste liquid combustion treatment device of this invention has a constitution containing a waste liquid feed part comprising a waste liquid tank 10, a sub-pump 10a for feeding a waste liquid, a control valve 11 for feeding the waste liquid and a waste liquid flowmeter 12, a main fuel feed part comprising a main fuel tank 13 storing heavy oil and an oil heater 14, mixing equipment 15, a main feed pump 15a, a burner 17, a combustion controller 20 and a fan for combustion air 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste liquid combustion treatment method for incinerating industrial waste such as waste liquid discharged from an automobile-related, food processing or other processing plant, and an apparatus therefor.

[0002]

2. Description of the Related Art In recent years, there has been a strong demand for measures to prevent foul odors in the preservation of water quality in inland waters related to environmental preservation and wastewater treatment. In particular, salt and edible oil discharged from the food industry, the automobile industry and other industries. It is difficult to treat cutting oil, lubricating oil, release agent, wiper oil, waste oil of edible oil, waste oil such as engine oil, washing water containing high concentration of BOD and COD, and other aqueous waste in the processing industry. It is a situation that is extremely high.

[0003] Conventional oil-based waste liquid and waste water are subjected to spray evaporation combustion treatment in a secondary combustion chamber in a rotary kiln incinerator or a stoker incinerator. Alternatively, in a combined stoker and rotary kiln furnace, waste solvent, waste oil, and the like are burned as burners by a burner, and the waste liquid is subjected to spray evaporation in a waste liquid furnace. In any case, in the case of waste liquid treatment, a large incinerator is required, and the treatment of water contained in the waste liquid is discharged to the outside air through spraying by spraying etc. It has been done as a part of.

Conventionally, oil-water emulsions have been burned in general. However, the amount of water added is limited in order to prevent the loss of heat from the flame. The combustion efficiency was affected by the type and heating conditions, and the versatility was poor. The upper limit of the amount of water added was only about 20% or less, and the fuel saving was only a few percent.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has been developed in consideration of the problem between liquid fuel and waste liquid or aqueous waste discharged in the food industry, automobile industry, and other processing industries. In order to form a mixed fuel and use the waste liquid as a combustion aid, it is used as a fine fuel by emulsification,
Through combustion of the miniaturized fuel mix, strive to incineration of waste, improvement in fuel efficiency, suppressing generation of NO _X, by reducing such exhaust gas, provided the waste combustion process method and apparatus which enables to improve the environment It is intended for.

[0006]

SUMMARY OF THE INVENTION Accordingly, the waste liquid combustion treatment method of the present invention is directed to a method for combusting aqueous industrial waste such as waste liquid or waste water discharged from automobile-related, food processing or other processing plants. Is used as an auxiliary fuel for the liquid main fuel of the production combustion furnace to form a mixed fuel with mixed water, and the mixed fuel is emulsified to form a finely divided fuel, which is put into a high temperature combustion furnace. And forming a water gas by thermal decomposition, adding an appropriate amount of combustion air according to the mixed water to the water gas, and performing waste liquid treatment by low-oxygen combustion under a reducing atmosphere. .

[0007] The present invention relates to a method of burning waste water or waste water such as waste water discharged from a car-related, food processing or other processing plant, and assists a combustion furnace for producing the waste liquid containing the waste water. In order to reduce fuel consumption by using it as a fuel, the waste liquid was mixed with a main fuel composed of a liquid fuel such as heavy oil to form a mixed fuel having mixed moisture, and milk was used for complete combustion of the mixed fuel. After achieving fine turbidity, the mixture was introduced into a combustion furnace at a high temperature of about 900 to 1100 ° C. to achieve water gasification by thermal decomposition, and a suitable amount of combustion air corresponding to the mixed water was added to the water gas. To perform low-oxygen combustion in a reducing atmosphere by performing a series of combustion treatments to efficiently incinerate and combust waste liquids, save main fuel, reduce exhaust gas, and reduce exhaust gas. Waste combustion process to help prevent pollution by suppressing generation of the NO _X in is obtained to perform the.

A waste liquid combustion treatment apparatus using the waste liquid combustion treatment method according to the first aspect of the present invention comprises a main fuel supply unit having an oil heater for heating and supplying a liquid fuel, a sub-pump, a waste liquid supply control valve, a waste liquid flow meter, and the like. A waste liquid supply section, a mixing section that mixes the main fuel and the waste liquid supplied from the respective supply sections to form a mixed fuel of waste liquid and oil, a main supply pump that supplies the burner from the mixing section, In the waste liquid combustion treatment device including the burner, the mixing unit is configured to miniaturize the emulsion of the mixed fuel, and supplies an appropriate amount of combustion air to the burner in accordance with the amount of water mixed in the mixed fuel. A burner combustion control mechanism is provided.

The invention according to claim 2 provides a fuel oil burning combustion furnace (burner) using a liquid fuel such as heavy oil as a main fuel, washing water generated in an organic impregnation step, cutting oil, lubricating oil, release agent, Form a mixed fuel to use as an auxiliary fuel wastewater consisting of industrial wastewater mixed with oil such as wiper oil, waste edible oil mixed with impurities and water, waste oil such as engine oil, and other wastewater composed of water-based waste. It is, charged to the burner by the emulsion pulverizing treatment in the mixed fuel, efficient incineration of waste, as well as the combustion process, savings and the main fuel, reduce emissions, and suppressing generating of the NO _X in the exhaust gas pollution The waste liquid combustion treatment which is useful for prevention is performed.

In order to achieve the above object, in the present invention, oil-water mixed fine particles of a waste liquid containing water supplied as an auxiliary fuel and a main fuel are supplied into a high temperature furnace at about 950 to 1050 ° C.
Thermal decomposition is caused in a high-temperature furnace, and a burner combustion control mechanism is provided to supply an appropriate amount of combustion air to the generated water gas, and the water gas is burned in a required combustion state. That is, are as described above by combustion at high temperature to allow the decomposition of dioxin, and performs reduction of generation NO _X by hypoxia operation by supplying a suitable amount of combustion air. Therefore, the air-fuel ratio is set by the burner combustion control mechanism with respect to the amount of water contained in the waste liquid forming the water gas to form the above-described combustion state.

According to a second aspect of the present invention, there is provided a burner combustion control mechanism in which the amount of combustion air satisfies an air-fuel ratio (to oil) of about 0.82 to 0.95 corresponding to the amount of the waste liquid mixed. It is characterized in that it is configured to be adjusted as described above.

According to the third aspect of the present invention, it is shown that the optimum combustion condition of the air-fuel ratio is 0.82 to 0.95 with respect to the oil content in the emulsified fuel.
Under the set air-fuel ratio, low-oxygen combustion is performed at a furnace temperature of about 900 ° C. to suppress the generation of NO _X. When the air-fuel ratio is 0.95 or more, an increasing number of the exhaust gas amount with O ₂ in the exhaust gas becomes excessive air is increased, combustion efficiency is reduced. Also,
When it is 0.82 or less, combustion air becomes insufficient and incomplete combustion occurs, CO in exhaust gas increases, and unburned loss increases,
Combustion efficiency also decreases.

[0013] Also, about 0.82 to 0.95 according to claim 3
The combustion air having the air-fuel ratio of 1 is characterized in that it is configured to form combustion under a reducing atmosphere.

The optimum combustion air amount is set for the moisture contained in the emulsified mixed fuel to form and maintain a reducing atmosphere in the combustion state in which the water gas is generated. To set the optimum amount, the burner combustion control mechanism selects and controls the optimum pattern of the amount of combustion air with respect to the moisture contained in the fuel emulsified. That is, a technique of analyzing the data of the amount of combustion air already accumulated and predicting and calculating an appropriate amount of required combustion air is used.

In addition, apart from the method of analyzing and calculating from the accumulated data, the luminance distribution state of the flame burning in the reducing atmosphere is captured by a CCD camera, and the obtained image is processed through image processing. The required combustion air may be calculated by performing gas analysis.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to an embodiment shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not merely intended to limit the scope of the present invention, but are merely illustrative examples unless otherwise specified. Absent. FIG.
1 is a system diagram showing a schematic configuration of a waste liquid combustion treatment device of the present invention.

As shown in FIG. 1, a waste liquid combustion processing apparatus according to the present invention comprises a waste liquid tank 10 and a sub-pump 10 for supplying waste liquid.
a, a waste liquid supply unit comprising a control valve 11 for supplying waste liquid and a waste liquid flow meter 12, a main fuel supply unit comprising a main fuel tank 13 for storing heavy oil and an oil heater 14, a mixer 15, Supply pump 15a and burner 17
And a combustion controller 20 and a combustion air fan 21 as main components.

The mixer 15 is an emulsion refining device. The mixer 15 supplies heavy oil, which is the main fuel supplied from the main fuel tank 13 via an oil heater 14, to the control valve 11 of the waste liquid supply section. Mixed with the supplied waste liquid to form a mixed fuel of water and fuel,
The mixture is refined and mixed in an emulsified state, and the emulsion refined liquid is introduced into a burner. The combustion controller 20 includes a waste liquid flow meter 12.
, The optimum combustion air amount in the burner 17 is calculated from the detected water value, and the calculated optimum combustion air amount is calculated by the burner 17 via the combustion air fan 21 and the blowing control damper 21a. It is configured to enable required combustion.

In the burner 17, the emulsion-mixed fuel composed of heavy oil and waste liquid, which is charged into a combustion furnace at about 900 to 1100 ° C. and formed by the burner 17, is gasified with water. If an appropriate amount of air is supplied as combustion air to the water gas to form a reducing atmosphere in the furnace, dioxin can be decomposed in a reducing atmosphere of 700 ° C. or higher, and NO _X can be obtained by operating in a low oxygen operation state. Can also be reduced.

In the present invention, in order to form the reducing atmosphere, a combustion control mechanism 20 is provided, and a combustion control mechanism 20 is provided via a waste liquid flow meter 12 based on a map showing the relationship between the water content of the mixed fuel and the optimum combustion air amount for the water content. An optimum amount of combustion air with respect to the obtained moisture is calculated, and the calculated value enables the formation of a reducing atmosphere via the combustion air fan 21.

To set the optimum combustion air amount, in addition to the calculation from the map based on the accumulation of the measurement data, the gas distribution during combustion such as the luminance distribution of the flame of the burner 17 is determined by CC.
It is also possible to form an image via the D camera 17a, perform gas analysis by image processing of the image, and calculate the required amount of combustion air. In the present invention, the present image monitoring mechanism is provided in parallel.

The optimum air amount of the combustion air is about 0.5.
It is desirable to set a value between 82 and 0.95. As can be seen from the test results shown in FIG. In Nos. 6 to 11, the reducing atmosphere was formed, the exhaust gas was reduced by about 10 to 40%, and the result that the NO _{X in} the exhaust gas could be reduced by 10 to 25% was obtained.

As shown in FIG. 2, when the air-fuel ratio becomes 0.95 or more, the air becomes excessive and O _{2 in the} exhaust gas becomes excessive.
As the amount of exhaust gas increases, the amount of exhaust gas increases, and the combustion efficiency decreases. On the other hand, if it is 0.82 or less, combustion air becomes insufficient and incomplete combustion occurs, CO in exhaust gas increases, unburned loss increases, and combustion efficiency decreases.

[0024]

According to the present invention, the following effects can be obtained by the above configuration. a. In the case of using the furnace of the production equipment in the company's own factory, it is possible to use and incinerate the industrial waste as an auxiliary fuel for the furnace without requesting a specialized company for a fee. b. Since the waste liquid can be used as an auxiliary fuel, fuel can be saved. c) The exhaust gas can be reduced by 10 to 40%, and the combustion efficiency can be increased. d, the NO _X in the exhaust gas can be reduced 10% to 25%. e. High-load combustion of inferior fuels such as waste edible oil and waste oil which are difficult to burn and are subjected to industrial waste treatment can be performed.

[Brief description of the drawings]

FIG. 1 is a system diagram showing a schematic configuration of a waste liquid combustion treatment device of the present invention. FIG.

FIG. 2 shows combustion test data by the waste liquid combustion treatment device of the present invention.

[Explanation of symbols]

 Reference Signs List 10 Waste liquid tank 11 Control valve 12 Waste liquid flow meter 13 Main fuel tank 14 Oil heater 15 Mixer 17 Burner 17a CCD camera 20 Combustion controller 21 Fan for combustion air 21a Blow control damper

Claims (4)

[Claims] Claims: 1. A method for combustion treatment of water-based industrial waste such as wastewater or wastewater discharged from an automobile-related, food processing or other processing plant, wherein the wastewater containing wastewater is used as an auxiliary fuel for the liquid main fuel of a combustion furnace for production. To form a mixed fuel with mixed water, emulsify the mixed fuel to form a finely divided fuel, and put it in a combustion furnace at a high temperature to form a water gas by thermal decomposition to form the water gas. A waste liquid combustion processing method, characterized in that an appropriate amount of combustion air according to the water content is added to perform waste liquid treatment by combustion in a reducing atmosphere. 2. A main fuel supply unit having an oil heater for heating and supplying a liquid fuel, a waste liquid supply unit including a sub-pump, a waste liquid supply control valve, and a waste liquid flow meter, and a main liquid supply unit supplied from the respective supply units. A mixing section that mixes fuel and waste liquid to form a mixed fuel of waste liquid and oil, a main supply pump that supplies the burner from the mixing section, and the burner;
In the waste liquid combustion treatment device, the mixing section is configured to reduce the size of the emulsion of the mixed fuel and burner combustion for supplying an appropriate amount of combustion air to the burner in accordance with the mixed amount of the waste liquid of the mixed fuel. A waste liquid combustion treatment device comprising a control mechanism. 3. The waste liquid combustion treatment apparatus according to claim 2, wherein the combustion air has an air-fuel ratio (to oil) of about 0.82 to 0.95. 4. The waste liquid combustion treatment apparatus according to claim 3, wherein the combustion air having an air-fuel ratio of about 0.82 to 0.95 forms combustion under a reducing atmosphere.