JPS62175510A - Incinerator of waste water containing oil - Google Patents

Abstract

PURPOSE:To prevent the temperature of a primary combustion chamber from being decreased and make an entire small-sized incinerator by a method wherein a waste water discharging nozzle of the primary combustion chamber is arranged below a flame of a primary burner. CONSTITUTION:Waste water is injector or atomized from an injection nozzle 4 of a primary combustion chamber 1 to below a flame of a primary burner 3, water content is evaporated, oil content is changed into combustion gas and they pass through a communication discharging hole 6 and are guided into a secondary combustion chamber 2. In the secondary combustion chamber 2, if an incomplete combustion is discharged within the discharged gas from the primary combustion chamber 1, it may be completely ignited with the flame of the secondary burner 8. Since no evaporation of water is found in the secondary combustion chamber 2, even if a heating calorie of the secondary burner 8 is low, the temperature of the furnace does not decrease. Since the size of the combustion chamber can be made small according to this arrangement, it is possible to miniaturize the secondary combustion chamber by about 20-40% of that of the primary combustion chamber.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a wastewater incinerator, and particularly to an oil-containing wastewater incinerator in which separation of oil and water is difficult.

In general, wastewater incinerators are mainly used to treat wastewater where oil-water separation is difficult and in environments where wastewater standards (BOD, COD, etc.) are strict. Examples of wastewater that is difficult to separate from oil and water include wastewater and wastewater generated in the cleaning process of systems that use water-based resins, paints, adhesives, etc., and wastewater generated in the cleaning process of organic impregnation systems, which contain organic polymer substances. Contains large amounts of.

(Conventional technology and its problems) If incomplete combustion occurs in a wastewater incinerator, it causes soot and bad odor. For this reason, it is necessary to maintain the temperature inside the furnace at a high temperature to ensure complete combustion throughout the furnace.

As methods for efficiently achieving complete combustion, there are methods such as spraying wastewater on a wall surface, and installing a board and flowing wastewater along it. Further, as methods of utilizing high temperature, there are a method of concentrating wastewater in advance using the high heat of exhaust gas to make it easier to incinerate, and a method of directly spraying wastewater into high-temperature gas.

In either case, it is necessary to maintain the entire inside of the furnace at a high temperature, which requires a large burner and a large amount of fuel. Moreover, in one combustion chamber, the incinerator itself becomes large-sized, and accordingly, a larger amount of fuel is required.

(Means for Solving the Problems) An object of the present invention is to solve the above-mentioned problems and provide a small-sized oil-containing wastewater incinerator that burns completely.

That is, a primary combustion chamber and a secondary combustion chamber are provided adjacent to each other, a waste water discharge nozzle is provided in the primary combustion chamber below the primary burner, and a secondary combustion chamber is provided above the primary combustion chamber, and a waste water discharge nozzle is provided in the primary combustion chamber and the secondary combustion chamber is provided above the primary combustion chamber. This causes secondary combustion of the exhaust gas in the primary combustion chamber, and the exhaust gas is discharged into the chimney.

Furthermore, the volume of the secondary combustion chamber is 5 times the volume of the primary combustion chamber.
In some cases, it is less than 0%.

(Function) As mentioned above, in the primary combustion chamber, waste water is not sprayed directly onto the flame of the primary burner, so the flame can be maintained at a high temperature without being cooled, and even if incomplete combustion occurs, it will be completely combusted in the secondary combustion chamber. I can do it.

(Example) FIG. 1 is a longitudinal sectional view of an oil-containing wastewater incinerator of the present invention, FIG. 2 is a sectional view taken along line A-Avfr in FIG. 1, and FIG. 3 is a sectional view taken along line BB. The furnace body is surrounded by a heat insulating material and roughly divided into a primary combustion chamber 1 and a secondary combustion chamber 2 located above the primary combustion chamber 1. A primary burner 3 is provided on the side surface of the primary combustion chamber 1, and a waste water discharge nozzle 4 is provided below the burner 3, and a communication exhaust hole 6 to the secondary combustion chamber 2 is provided in the primary partition wall 5 on the top surface. be. The height of the secondary combustion chamber is lower than that of the primary combustion chamber (
(in this embodiment, approximately 30%), and the secondary combustion chamber 2 is connected to the secondary partition wall 7 having a length of approximately 273 diameters from one side in the diametrical direction.
Large portions. This part 2-
The communication exhaust hole 6 is provided on the bottom surface (primary partition wall 5) of the fuel cell 1, and a secondary burner 8 is provided on the side surface facing the other portion 2-2. Other part 2-
An exhaust hole 9 is provided on the top surface of 2, and a chimney 10 is connected thereto.

The primary burner consumes 25 N/h of heavy oil, and the secondary burner consumes 151 N/h of heavy oil.

The waste water is sprayed from the waste water discharge nozzle 4 of the primary combustion chamber 1 onto the underside of the flame of the primary burner 3. The water in the mist-like wastewater is immediately evaporated due to the heat, and the oil content is combusted and gasified, and is led to the secondary combustion chamber 2 through the communication exhaust hole 6. In this case, in the case of low-concentration oil-containing wastewater, heat is taken away by one latent heat of water, and the temperature of the furnace may drop to 700° C. or lower, resulting in incomplete combustion. However, when waste water is sprayed under the flame of the primary burner 3 as in this embodiment, the flame is not directly cooled by the spray, and the temperature of the furnace is unlikely to drop.

In the secondary combustion chamber 2, if there is exhaust gas from the primary combustion chamber 1 that has completely burned the exhaust core, it will be completely combusted by the flame of the secondary burner. Since water is not evaporated in this secondary combustion chamber 2, the temperature of the furnace does not drop even if the calorific value of the secondary burner 8 is small. Moreover, since the combustion chamber can be made smaller for this reason, it can be made smaller to about 20 to 40% of the primary combustion chamber. Furthermore, since the combustion chamber is small, even a small burner can easily reach the required temperature (for example, 700° C.). According to the actual data, it took 2 hours to reach 700°C in the primary combustion chamber 1 with the primary burner 3, but it took 1 hour and 30 minutes to reach 700°C in the secondary combustion chamber 2 with the secondary burner 8. It was enough.

As a result, by employing the secondary combustion chamber 2 with a small volume, fuel savings of 10 to 30% was achieved compared to the case of two primary combustion chambers.

Approximately 3% of waste water from the cleaning process of organic impregnation systems
When incinerating wastewater containing acrylic monomers,
Even if the temperature of the primary combustion chamber is 390"C, if the temperature of the secondary combustion chamber is 700"C, complete combustion will occur and no soot or odor will be generated.

Data for examples at various temperatures are shown in Table 1 (next page).

As a comparative example, the case of a furnace that does not use a secondary combustion chamber and the state after the burner of the secondary combustion chamber is stopped are also shown.

(Effect of the invention) By providing the waste water discharge nozzle of the primary combustion chamber below the flame of the primary burner, the temperature drop in the primary combustion chamber is prevented, and by providing a small secondary combustion chamber, the entire incinerator It is possible to downsize and save fuel.

Furthermore, even low-concentration oil-containing wastewater can be completely combusted.

Table 1

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIG. 3 is a sectional view taken along line BB. 2: Secondary combustion chamber, 3: Primary burner, 4: Waste water discharge nozzle, 8: Secondary burner. Jun 1 area 2nd Raku 3rd

Claims (1)

[Claims] 1) In an oil-containing wastewater incinerator, a primary combustion chamber and a secondary combustion chamber are provided adjacent to each other, a wastewater discharge nozzle is provided in the primary combustion chamber below the primary burner, and the secondary combustion chamber is provided with a wastewater discharge nozzle below the primary burner. An oil-containing wastewater incinerator characterized in that a secondary burner is provided above the primary combustion chamber to perform secondary combustion of the exhaust gas from the primary combustion chamber, and the exhaust gas is discharged into a chimney. 2) The volume of the secondary combustion chamber is 5 times the volume of the primary combustion chamber.
An oil-containing wastewater incinerator according to claim 1, wherein the oil-containing wastewater incinerator has a concentration of 0% or less.