Wastewater incineration treatment system

Abstract

A waste water incineration treatment system is characterized by comprising a waste water spray gun (1), a combustion-supporting combustor (2), a secondary combustion-supporting air annular air box (3), a vertical incinerator (4), a steam pocket (5), a water-cooled wall evaporator (6), a superheater (7), an evaporator (8), a selective non-catalytic reduction denitration spray gun (9), an air preheater (10) and a catalytic reduction denitration reactor (11). An economizer (12), an induced draft fan (13) and a chimney (14); a combustion fan (15); and a feed pump (16). The incinerator is reasonable in structural design, can effectively incinerate and decompose organic matters in waste gas and waste liquid by controlling air distribution and temperature in the incinerator, and can reduce generation of nitric oxide; combustion-supporting air enters the hearth after being heated by the air preheater, so that consumption of combustion-supporting fuel is greatly reduced.

Description

Technical Field

[0001] The utility model relates to a wastewater treatment technology, in particular to a wastewater incineration treatment technology, specifically to a wastewater incineration treatment system. Background Art

[0002] As people's living standards improve, higher requirements are put forward for the extension of chemical products and the improvement of the industrial chain. More and more fine chemical plants are put into production, and a large number of by-products in the production process need to be cleaned up, such as hazardous industrial wastewater. Industrial wastewater is characterized by large flow, high water content, low calorific value, and often highly toxic, and explosive after concentration.

[0003] Incineration technology is the preferred process for treating this type of industrial wastewater, but how to select the optimal process route based on the characteristics of the wastewater is still a difficult problem. Because the incineration of wastewater with low calorific value will consume a lot of fuel, in addition, the nitrogen oxides emitted in the flue gas produced by the incineration of wastewater with high nitrogen content will become a new source of pollution if the treatment is not up to standard. Therefore, the development of a wastewater incineration treatment system with reasonable design, convenient operation, convenient maintenance, low energy consumption, low secondary pollutant emissions, long service life and stable operation can bring economic and environmental benefits to enterprises and society. Utility Model Content

[0004] The utility model aims to design a wastewater incineration treatment system in view of the problems of difficulty in meeting the nitrogen oxide emission standards and high consumption of combustion-supporting fuel in industrial wastewater incineration treatment systems.

[0005] The technical solution of the utility model is:

[0006] A wastewater incineration treatment system, characterized in that it includes a vertical incinerator 4, a steam drum 5, a superheater 7, an evaporator 8 and a water supply pump 16, a wastewater spray gun 1 is installed on the upper part of the vertical incinerator 4, the wastewater spray gun 1 is connected to the wastewater source through a pipeline, a combustion-supporting burner 2 is installed at the lower part of the wastewater spray gun 1, and the combustion-supporting burner 2 is supplied with combustion gas by a natural gas pipeline; the inlet end of the water-cooled wall evaporator 6 is connected to the outlet end of the vertical incinerator 4 through a pipeline, the inlet end of the air preheater 10 is connected to the flue gas outlet end of the water-cooled wall evaporator 6 through a pipeline, and the inlet end of the catalytic reduction denitration reactor 11 is connected to the air preheater 1 through a pipeline. 0 is connected to the flue gas outlet end, the inlet end of the economizer 12 is connected to the flue gas outlet end of the catalytic reduction denitration reactor 11 through a pipeline, the induced draft fan 13 is connected to the flue gas outlet end of the economizer 12 through a pipeline, and the inlet end of the chimney 14 is connected to the outlet end of the induced draft fan 13 through a pipeline; the feed water pump 16 is connected to the steam-water pipeline of the economizer 12, the steam-water pipeline of the economizer 12 is connected to the steam-water pipeline of the evaporator 8, the steam-water pipeline of the evaporator 8 is connected to the steam drum 5, and the steam-water pipeline of the superheater 7 is connected to the steam drum 5; the superheater 7 and the evaporator 8 are both installed in the water-cooled wall evaporator 6.

[0007] The air preheater 10 is connected to a combustion-supporting fan 15 on one hand, and is communicated with a secondary combustion-supporting air annular wind box 3 installed in the vertical incinerator 4 and a combustion-supporting air inlet of the combustion-supporting burner 2 on the other hand.

[0008] The wastewater spray gun 1 is installed on the top of the vertical incinerator 4; the combustion-supporting burner 2 is installed on the side wall of the vertical incinerator 4, and the secondary combustion-supporting air annular wind box 3 is installed on the side wall of the vertical incinerator 4 and is located at the bottom of the combustion-supporting burner 2.

[0009] A selective non-catalytic reduction denitrification spray gun 9 is installed inside the water-cooled wall evaporator 6 .

[0010] The beneficial effects of the utility model are:

[0011] (1) The incinerator is vertical and the burner is side-burning. Three side-burning burners are designed to burn in a circular manner to form a plasma layer in the furnace. The wastewater is installed on the top and sprayed downward. The wastewater is fully decomposed after passing through the plasma layer.

[0012] (2) The air supply of the incinerator is divided into secondary air. The primary air enters from the burner. The fuel gas burns in a low-oxygen and high-temperature environment, which can effectively reduce the generation of nitrogen oxides. The secondary air enters from the incinerator body to provide sufficient oxygen to the flue gas in the furnace, ensuring a destruction rate of more than 99.9%.

[0013] (3) The waste heat boiler adopts the form of a water-cooled wall wrapped around the convection heating surface. The 1100℃ high-temperature flue gas coming out of the furnace enters the water-cooled wall boiler, avoiding the use of a steel shell that requires thicker insulation and anti-scalding materials, saving installation consumables.

[0014] (4) The combustion air is heated to a higher temperature in the air preheater, which increases the furnace temperature and saves fuel consumption. In the engineering design case, the air temperature was increased to 300°C and the fuel consumption was reduced by ~56%.

[0015] (5) The air preheater is designed at a higher flue gas inlet temperature, with a large heat transfer coefficient and a reduced heat transfer area, which greatly reduces the steel consumption of the air preheater.

[0016] (6) The outlet temperature of the catalytic reduction denitrification reactor is designed to be around 350°C. After the catalytic reduction denitrification reactor, an economizer is added to recover the waste heat to below 150°C, which provides economic benefits for the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the system flow of the utility model. DETAILED DESCRIPTION

[0018] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0019] like Figure 1 shown.

[0020] A wastewater incineration treatment system comprises a wastewater spray gun 1, a combustion-supporting burner 2, a secondary combustion-supporting air annular wind box 3, a vertical incinerator 4, a steam drum 5, a water-cooled wall evaporator 6, a superheater 7, an evaporator 8, a selective non-catalytic reduction denitration spray gun 9, an air preheater 10, a catalytic reduction denitration reactor 11, an economizer 12, an induced draft fan 13 and a chimney 14. The water-cooled wall evaporator 6 is installed behind the outlet of the vertical incinerator, the air preheater 10 is installed behind the flue gas outlet of the water-cooled wall evaporator 6, the catalytic reduction denitration reactor 11 is installed behind the flue gas outlet of the air preheater 10, the economizer 12 is installed behind the flue gas outlet of the catalytic reduction denitration reactor 11, the induced draft fan 13 is installed behind the flue gas outlet of the economizer 12, and the chimney 14 is installed behind the induced draft fan 13; the feed water pump 16 is connected to the steam-water pipeline of the economizer 12, the steam-water pipeline of the economizer 12 is connected to the steam-water pipeline of the evaporator 8, and the steam-water pipeline of the evaporator 8 is connected to the steam drum 5. The steam-water pipeline of the superheater 7 is connected to the steam drum 5; the evaporator 8 is installed inside the water-cooled wall evaporator 6, and the superheater 7 is installed inside the water-cooled wall evaporator 6; the combustion-supporting fan 15 is connected to the air pipeline of the air preheater 10, and the air preheater 10 is connected to the secondary combustion-supporting air annular wind box 3 and the combustion-supporting air inlet of the combustion-supporting burner 2; the wastewater spray gun 1 is installed on the top of the vertical incinerator 4; the combustion-supporting burner 2 is installed on the side wall of the vertical incinerator 4, and the secondary combustion-supporting air annular wind box 3 is installed on the side wall of the vertical incinerator 4; the selective non-catalytic reduction denitrification spray gun 9 is installed inside the water-cooled wall evaporator 6.

[0021] The working principle of the utility model is as follows: the fuel gas provides heat for the furnace to maintain the incineration temperature through the combustion-supporting burner, the waste water is atomized by the waste water spray gun and then enters the furnace to be evaporated and decomposed; the combustion-supporting air is preheated by the air preheater and then enters the furnace and the burner to increase the furnace temperature to 1100°C; the flue gas from high-temperature incineration is recovered to about 600°C through the water-cooled wall evaporator, evaporator, and superheater after waste heat is recovered, and then enters the air preheater for further cooling, and after the temperature reaches the reaction temperature of the catalytic reduction denitration reactor of about 350°C, it enters the reactor for denitration reaction; after the flue gas is denitrated, it enters the economizer for waste heat recovery to below 150°C and is discharged to the atmosphere through the induced draft fan to the chimney.

[0022] The parts not involved in the present invention are the same as the prior art or can be implemented by using the prior art.

Claims

1. A wastewater incineration treatment system, characterized in that: It comprises a vertical incinerator (4), a steam drum (5), a superheater (7), an evaporator (8) and a water supply pump (16). A wastewater spray gun (1) is installed on the upper part of the vertical incinerator (4). The wastewater spray gun (1) is connected to a wastewater source through a pipeline. A combustion-supporting burner (2) is installed on the lower part of the wastewater spray gun (1). The combustion-supporting burner (2) is supplied with combustion gas from a natural gas pipeline. The inlet end of the water-cooled wall evaporator (6) is connected to the outlet end of the vertical incinerator (4) through a pipeline. The inlet end of the air preheater (10) is connected to the flue gas outlet end of the water-cooled wall evaporator (6) through a pipeline. The inlet end of the catalytic reduction denitration reactor (11) is connected to the flue gas outlet end of the air preheater (10) through a pipeline. The inlet end of the economizer (12) is connected to the flue gas outlet end of the catalytic reduction denitration reactor (11) through a pipeline, the induced draft fan (13) is connected to the flue gas outlet end of the economizer (12) through a pipeline, and the inlet end of the chimney (14) is connected to the outlet end of the induced draft fan (13) through a pipeline; the feed water pump (16) is connected to the steam-water pipeline of the economizer (12), the steam-water pipeline of the economizer (12) is connected to the steam-water pipeline of the evaporator (8), the steam-water pipeline of the evaporator (8) is connected to the steam drum (5), and the steam-water pipeline of the superheater (7) is connected to the steam drum (5); the superheater (7) and the evaporator (8) are both installed in the water-cooled wall evaporator (6).

2. The wastewater incineration treatment system according to claim 1, characterized in that: The air preheater (10) is connected to a combustion-supporting fan (15) on one hand, and is in communication with a secondary combustion-supporting air annular wind box (3) installed in a vertical incinerator (4) and a combustion-supporting air inlet of a combustion-supporting burner (2) on the other hand.

3. The wastewater incineration treatment system according to claim 1, characterized in that: The wastewater spray gun (1) is installed on the top of the vertical incinerator (4); the combustion-supporting burner (2) is installed on the side wall of the vertical incinerator (4); and the secondary combustion-supporting air annular wind box (3) is installed on the side wall of the vertical incinerator (4) and is located below the combustion-supporting burner (2).

4. The wastewater incineration treatment system according to claim 1, characterized in that: A selective non-catalytic reduction denitrification spray gun (9) is installed inside the water-cooled wall evaporator (6).

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