Comprehensive treatment system for furnace ash of acrylonitrile wastewater furnace

Abstract

The invention provides an acrylonitrile wastewater furnace ash comprehensive treatment system which comprises an ash falling pipe, a furnace ash collecting tank and an aqueous solution buffer tank, the ash falling pipe is of a Venturi-like pipe structure and is divided into an upper part and a lower part, the middle of the ash falling pipe is flexibly connected through a cloth bag, the furnace ash collecting tank comprises a water seal cover and a collecting tank, water is contained in the collecting tank, and the water seal cover is inversely buckled in the collecting tank. The side face of the collecting tank is connected with an aqueous solution buffer tank through a water outlet pipeline, the aqueous solution buffer tank is connected with a water pump, the water pump pumps out furnace ash aqueous solution and then divides the furnace ash aqueous solution into two parts, one part is sent to the collecting tank, the other part is sent to a sewage treatment plant to be used for adjusting the pH value, and the aqueous solution buffer tank is supplemented with water through an external water source. According to the method, the furnace ash aqueous solution is generated by directly dissolving the furnace ash with water and is sent to the sewage treatment plant, so that the subsequent furnace ash hazardous waste treatment link is omitted, the furnace ash treatment efficiency is improved, the furnace ash aqueous solution is used for partially replacing NaOH solution consumption of the sewage treatment plant, and the sewage treatment cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical pollution treatment, and particularly relates to a comprehensive treatment system for the furnace ash of acrylonitrile wastewater furnace. Background Art

[0002] At the present stage, the furnace ash of acrylonitrile wastewater furnace is unloaded by a bag filter and then loaded into a ton bag, and transported to the hazardous waste storage room by a forklift for temporary storage. After that, the environmental protection department contacts a qualified unit for hazardous waste treatment. The treatment process is cumbersome and costly. At the same time, the labor intensity of employees is relatively high, and the working environment is poor. Moreover, during the operation of the sewage treatment plant, NaOH solution is needed to adjust the pH value. Since the main component of the furnace ash is Na2CO3, which is alkaline after dissolving in water, it can partially replace the NaOH solution for adjusting the pH value. Summary of the Invention

[0003] The present invention provides a comprehensive treatment system for the furnace ash of acrylonitrile wastewater furnace, which includes a dust dropping pipe, a furnace ash collection tank and an aqueous solution buffer tank. The dust dropping pipe is of a Venturi-like structure and is divided into upper and lower parts, with a cloth bag soft connection in the middle. The upper pipe of the dust dropping pipe is connected to the ash discharge port at the bottom of the furnace ash bin through an electric rotary valve, and plant air is introduced between the upper pipe of the dust dropping pipe and the electric rotary valve. The furnace ash collection tank includes a water seal cover and a collection tank. The collection tank is filled with water. The water seal cover is inverted in the collection tank, with the lower part immersed below the water surface and the upper part floating on the water surface. The middle of the water seal cover is divided into area A and area B by a vertical partition board. The bottom end of the vertical partition board is immersed below the water surface. A dust dropping port is provided at the top of area A and is connected to the lower pipe of the dust dropping pipe. Area A is connected to area B through a communicating pipe and the communicating pipe is inserted below the water surface of area B. A dust blocking net is arranged at the bottom outlet of the communicating pipe. An escape port is provided at the top of area B. A vertical dust blocking board is arranged between the dust dropping port of area A and the communicating pipe. There is a certain gap between the bottom end of the vertical dust blocking board and the water surface. The side of the collection tank is connected to the aqueous solution buffer tank through a water outlet pipeline. The aqueous solution buffer tank is connected to a water pump. After the furnace ash aqueous solution is pumped out by the water pump, it is divided into two streams. One stream is sent to the collection tank, and the other stream is sent to the sewage treatment plant for adjusting the pH value. The aqueous solution buffer tank is connected to an external water source through a float valve and a water replenishing pipeline, and a heat exchanger is arranged on the water replenishing pipeline.

[0004] Compared with the prior art, the present invention has at least the following beneficial effects:

[0005] 1. The present invention directly dissolves the furnace ash in water to generate alkaline water and sends it to the sewage treatment plant, eliminating the subsequent hazardous waste treatment link of the furnace ash and improving the treatment efficiency of the furnace ash.

[0006] 2. The present invention uses the furnace ash aqueous solution obtained by dissolution to partially replace the consumption of NaOH solution in the sewage treatment plant, reducing the sewage treatment cost. Brief Description of the Drawings

[0007] The embodiments of the comprehensive treatment system for the furnace ash of acrylonitrile wastewater furnace of the present invention will be described below with reference to the accompanying drawings. The accompanying drawings are as follows:

[0008] Figure 1 It is a schematic structural diagram of a comprehensive treatment system for the furnace ash of an acrylonitrile wastewater furnace provided by the present invention. Specific embodiments

[0009] First of all, those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention. Those skilled in the art can make adjustments according to needs to adapt to specific application scenarios.

[0010] Secondly, it should be noted that in the description of the present invention, the terms indicating directions or positional relationships such as "inner", "outer", etc. are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0011] In addition, it should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0012] The following describes the specific implementation of the present invention in detail with specific embodiments:

[0013] As Figure 1As shown in the figure, an integrated treatment system for the furnace ash of acrylonitrile wastewater furnace provided by an embodiment of the present invention includes an ash dropping pipe, a furnace ash collection tank and an aqueous solution buffer tank. The ash dropping pipe is of a Venturi-like tube structure, divided into upper and lower parts, and connected by a cloth bag flexible connection in the middle. The upper pipe of the ash dropping pipe is connected to the ash discharge port at the bottom of the furnace ash bin through an electric rotary valve. Factory air is introduced between the upper pipe of the ash dropping pipe and the electric rotary valve. The furnace ash collection tank includes a water seal cover and a collection tank. The collection tank is filled with water. The water seal cover is inverted in the collection tank, with the lower part immersed below the water surface and the upper part floating on the water surface. The middle of the water seal cover is divided into area A and area B by a vertical partition board. The bottom end of the vertical partition board is immersed below the water surface. There is an ash dropping port at the top of area A, which is connected to the lower pipe of the ash dropping pipe. The top of area A is connected to area B through a connecting pipe and inserted below the water surface of area B. A dust blocking net is arranged at the bottom outlet of the connecting pipe. There is an escape port at the top of area B. A vertical dust blocking board is arranged between the ash dropping port of area A and the connecting pipe. There is a certain gap between the bottom end of the vertical dust blocking board and the water surface. The side of the collection tank is connected to the aqueous solution buffer tank through a water outlet pipeline. The aqueous solution buffer tank is connected to a water pump. After the furnace ash aqueous solution is pumped out by the water pump, it is divided into two streams. One stream is sent to the collection tank, and the other stream is sent to the sewage treatment plant to adjust the pH value. The aqueous solution buffer tank is connected to an external water source through a float valve and a water replenishing pipeline. A heat exchanger is arranged on the water replenishing pipeline.

[0014] The working principle of the present invention is as follows:

[0015] Factory air is filled between the upper pipe of the ash dropping pipe and the electric rotary valve to ensure that the pressure between the ash dropping pipe and the solution water surface is slightly positive. Among them, the upper pipe of the ash dropping pipe is the high-pressure area, and the lower pipe of the ash dropping pipe is the low-pressure area. After the factory air enters the ash dropping pipe, it flows from top to bottom, which can not only inhibit the rising of water vapor but also ensure the smooth falling of the furnace ash, making the ash dropping pipe in a dry state, avoiding caking and wall hanging of the furnace ash after being affected by moisture, and blocking the ash discharge port. Adjust the opening of the factory air valve according to the bulging degree of the cloth bag and maintain it at an appropriate flow rate. Judge whether there is furnace ash hanging on the wall by pinching the cloth bag. The furnace ash in the furnace ash bin is discharged through the ash discharge port and the ash dropping pipe and falls into area A of the water seal cover. After the furnace ash falls into area A, most of it dissolves in the water in the collection tank. A small amount of furnace ash rises through the gap between the dust blocking board and the water surface with the air, enters area B through the top connecting pipe, and then descends into the water surface. After being blocked by the dust blocking net, all the furnace ash dissolves, and the air escapes above the water surface of area B and is discharged into the atmosphere through the escape port, which can prevent the furnace ash from diffusing into the atmosphere and polluting the environment.

[0016] An aqueous solution buffer tank is set. The solution in the collection tank flows into the aqueous solution buffer tank by gravity. After being pumped out by the water pump, it is divided into two streams. One stream is sent into the collection tank to perform forced circulation on the furnace ash aqueous solution, which can replace the stirring and mixing method, make the furnace ash and reclaimed water evenly mixed, and ensure the complete dissolution of the furnace ash. The other stream is sent to the sewage treatment plant to adjust the pH value.

[0017] According to the external delivery volume of the furnace ash aqueous solution, water is automatically replenished into the aqueous solution buffer tank through the float valve and the water replenishing pipeline and the liquid level is maintained. The water source comes from the reclaimed water of the sewage treatment plant.

[0018] A heat exchanger is installed in the make-up water pipeline. Through heat exchange between steam and reclaimed water, the temperature of the reclaimed water is controlled at 30°C - 80°C to ensure that the furnace ash is fully dissolved in water.

[0019] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A comprehensive treatment system for ash from an acrylonitrile wastewater furnace, comprising an ash falling pipe, an ash collecting tank and an aqueous solution buffer tank, characterized in that: The ash dropping pipe is a venturi-like structure, divided into two parts, an upper part and an lower part, with a bag soft connection in the middle. The upper pipe of the ash dropping pipe is connected to the ash discharge port at the bottom of the ash bin through an electric rotary valve, and the factory air is connected between the upper pipe of the ash dropping pipe and the electric rotary valve. The ash collecting tank includes a water seal cover and a collecting tank. The collecting tank is filled with water. The water seal cover is inverted in the collecting tank, with the lower part immersed under the water surface and the upper part floating above the water surface. The middle of the water seal cover is divided into area A and area B by a vertical partition. The bottom end of the vertical partition is immersed under the water surface. The top of area A is provided with an ash dropping port connected to the lower pipe of the ash dropping pipe. The top of area A is connected to the lower pipe of the ash dropping pipe through a water seal cover. The connecting pipe is connected to area B and inserted under the water surface of area B. An ash blocking net is set at the bottom outlet of the connecting pipe, an escape outlet is set at the top of area B, a vertical ash baffle is set between the ash outlet of area A and the connecting pipe, and a certain gap is left between the bottom of the vertical ash baffle and the water surface. The side of the collecting tank is connected to the aqueous solution buffer tank through a water outlet pipeline, and the aqueous solution buffer tank is connected to a water pump. After the water pump draws out the ash aqueous solution, it is divided into two streams, one is sent to the collecting tank, and the other is sent to the sewage treatment plant for adjusting the pH value. The aqueous solution buffer tank is connected to an external water source through a float valve and a water supply pipeline, and a heat exchanger is set on the water supply pipeline.

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