Core shooting machine tail gas washing and treatment system

Abstract

A waste gas washing and treatment system for a core shooter, comprising an acid solution tank, a spray container, a waste gas collection device, a water mist spraying device, a large-flow spraying device and a discharge device. The spray container is connected to the waste gas collection device. A water mist spraying device and a large-flow spraying device are arranged between the acid solution tank and the spray container. The upper part of the spray container is connected to the discharge device. A phosphoric acid solution with a certain concentration is injected into the acid solution tank. During the core making process, the collection device is started to collect the intermittently generated waste gas containing triethylamine into the spray container, and then acid solution spraying is carried out. First, the water mist spraying device is started to carry out acid solution atomizing spraying on the waste gas in the spray container, and then the large-flow spraying device is started to spray a large flow of phosphoric acid aqueous solution to deposit the acid mist generated by the atomizing spraying. Finally, the qualified waste gas is discharged through the discharge device. This system has good treatment effect, high efficiency, can ensure the compliance of waste gas discharge, low acid solution consumption and low energy consumption.

Description

Technical Field

[0001] The present invention relates to a purification treatment device for triethylamine tail gas generated during the core-making process of a core shooter, belonging to the technical field of triethylamine tail gas treatment. Background Art

[0002] In the casting industry, the preparation of sand cores and sand molds is an important link. Usually, a core shooter is used to make cores. During the core-making process, an amine blowing process is required, so tail gas containing triethylamine is generated, and the triethylamine tail gas has the characteristic of intermittent emission.

[0003] Currently, for the scrubbing tower used to treat triethylamine tail gas, the tail gas is discharged into a large-screen area with a large space. The tail gas is sparsely distributed and then drawn away by an induced draft fan for spray treatment. This is a spray pickling during the tail gas emission process. In this way, the tail gas just passes by the acid solution, cannot be fully mixed, the neutralization time is short, and the air volume of the induced draft fan is too large, which easily takes away the acid solution. The existing problems are: poor treatment and purification effect, large consumption of acid solution, and high energy consumption. Summary of the Invention

[0004] Aiming at the deficiencies existing in the existing technology for treating amine blowing tail gas during core-making in casting, the present invention provides a tail gas scrubbing treatment system for core shooters with good treatment effect and low energy consumption.

[0005] The tail gas scrubbing treatment system for core shooters of the present invention adopts the following technical solutions:

[0006] The system includes an acid solution tank, a spray container, a tail gas collection device, a water mist spray device, a large-flow spray device, and a discharge device. The spray container is connected to the tail gas collection device. A water mist spray device and a large-flow spray device are arranged between the acid solution tank and the spray container. The upper part of the spray container is connected to the discharge device.

[0007] The spray container is a soft bag, and the soft bag has a telescopic property and can be telescoped according to the amount of collected tail gas to ensure that the soft bag can be filled with tail gas and can be in full contact with the acid solution to ensure the treatment effect.

[0008] Two spray containers (soft bags) are provided. For large core shooters, double soft bags are used to operate alternately to meet the amine blowing process for a long time.

[0009] The tail gas collection device includes a collection fan. The inlet of the collection fan is connected to the tail gas pipeline of the core shooter, and the outlet of the collection fan is connected to the spray container through an intake valve. The collection fan is started to collect the intermittently generated tail gas into the spray container.

[0010] The water mist spray device includes a first spray pump and a first spray pipe. The inlet and outlet of the first spray pump are respectively connected to the acid solution tank and the first spray pipe, and water mist nozzles are distributed on the first spray pipe.

[0011] The large-flow spray device comprises a second spray pump and a second spray pipe, the inlet and outlet of the second spray pump are respectively connected to the acid pool and the second spray pipe, and large-flow spray nozzles are distributed on the second spray pipe.

[0012] The discharge device comprises a discharge fan, which is connected to the spray container through a discharge valve. The discharge fan is started to discharge the gas after the spraying process.

[0013] A phosphoric acid solution of a certain concentration is injected into the acid pool. During the core making process, the collection device is started to collect the tail gas containing triethylamine intermittently generated into the spray container, and then the acid is sprayed; first, the water mist spray device is started to spray the tail gas in the spray container with acid atomization, and then the large-flow spray device is started to spray a large-flow phosphoric acid aqueous solution to deposit the acid mist generated by the atomization spray. Finally, the tail gas that meets the standard is discharged through the discharge device.

[0014] The invention directly extracts the tail gas in the amine blowing process from the core box bottom frame with a very small volume, collects it in a soft bag, sprays phosphoric acid mist in a concentrated manner, then sprays a large flow of phosphoric acid aqueous solution to deposit the acid mist, and then starts the induced draft fan to discharge the tail gas that meets the standard; in this way, firstly, the treatment effect is good and the efficiency is high, which can ensure that the discharge meets the standard; secondly, the acid liquid consumption is low, which is 10% of that of the current traditional washing tower; thirdly, the energy consumption is low, the power of the tail gas collection fan is only 3KW, the power of the discharge fan is only 1.1KW, and the energy consumption is 30% of that of the current matching washing tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the core shooting machine tail gas washing and treatment system of the present invention.

[0016] Figure 2 yes Figure 1 Left view of .

[0017] Figure 3 yes Figure 1 Top view of.

[0018] Wherein: 1. bracket, 2. acid pool, 3. high flow nozzle, 4. water mist nozzle, 5. first soft bag, 6. second soft bag, 7. first discharge valve, 8. second discharge valve, 9. discharge pipeline, 10. discharge fan, 11. first air inlet pipe, 12. second air inlet pipe, 13. first spray pipe, 14. second spray pipe, 15. first spray pump, 16. second spray pump, 17. collection fan, 18. first air inlet valve, 19. second air inlet valve. DETAILED DESCRIPTION

[0019] like Figure 1 , Figure 2 and Figure 3As shown in the figure, the exhaust gas washing and treatment system of the core shooter of the present invention includes a bracket 1, an acid solution tank 2, a spray container, an exhaust gas collection device, a water mist spraying device, a large-flow spraying device, and an emission device. The bottom of the bracket 1 is provided with an acid solution tank 2. The spray container is arranged on the bracket 1 above the acid solution tank 2. The spray container adopts a soft bag with telescopic characteristics, and the soft bag can be telescoped according to the amount of exhaust gas collected to ensure that the soft bag is filled with exhaust gas, so that the exhaust gas can be fully contacted with the acid solution. Multiple soft bags can be provided. Figure 1 The first soft bag 5 and the second soft bag 6 are arranged therein. The spray container (the first soft bag 5 and the second soft bag 6) is connected to the exhaust gas collection device. A large-flow spraying device and a water mist spraying device are arranged between the acid solution tank 2 and each spray container (the first soft bag 5 and the second soft bag 6). The upper part of the spray container (the first soft bag 5 and the second soft bag 6) is connected to the emission device.

[0020] The exhaust gas collection device includes a collection fan 17. Refer to Figure 3 , the inlet of the collection fan 17 is connected to the exhaust gas pipeline of the core shooter, and the outlet of the collection fan 17 is respectively connected to the first intake pipe 11 and the second intake pipe 12 through the first intake valve 18 and the second intake valve 19. The first intake pipe 11 and the second intake pipe 12 are respectively connected to the first soft bag 5 and the second soft bag 6. The first intake valve 18 and the second intake valve 19 can adopt pneumatic butterfly valves. Start the collection fan 17, open the first intake valve 18 and / or the second intake valve 19, and collect the intermittently generated exhaust gas into the first soft bag 5 and / or the second soft bag 6 through the first intake pipe 11 and / or the second intake pipe 12.

[0021] The water mist spraying device includes a first spray pump 15 and a first spray pipe 13. Refer to Figure 2 . The inlet and outlet of the first spray pump 15 are respectively connected to the acid solution tank 2 and the first spray pipe 13, and water mist nozzles 4 are distributed on the first spray pipe 13. Start the first spray pump 15 to suck the acid solution in the acid solution tank 2 and spray it out atomized by the water mist nozzles 4. The flow rate of the water mist nozzles 4 is less than the flow rate of the large-flow nozzles 3.

[0022] The large-flow spraying device includes a second spray pump 16 and a second spray pipe 14. Refer to Figure 2 . The inlet and outlet of the second spray pump 16 are respectively connected to the acid solution tank 2 and the second spray pipe 14, and large-flow nozzles 3 are distributed on the second spray pipe 14. Start the second spray pump 16 to suck the acid solution in the acid solution tank 2 and spray it out in a large flow by the large-flow nozzles 3.

[0023] The emission device includes an emission fan 10. Refer to Figure 1。The inlet of the exhaust fan 10 is connected to the exhaust pipe 9, and the exhaust pipe 9 is connected to the first soft bag 5 and the second soft bag 6 through the first exhaust valve 7 and the second exhaust valve 8 respectively. Start the exhaust fan 10, open the first exhaust valve 7 and / or the second exhaust valve 8, and the gas in the first soft bag 5 and / or the second soft bag 6 after spray treatment is discharged through the exhaust pipe 9. The first exhaust valve 7 and the second exhaust valve 8 can adopt pneumatic butterfly valves.

[0024] The operation process of the above-mentioned core shooter tail gas washing treatment system is as follows.

[0025] Inject a certain concentration of phosphoric acid solution into the acid solution pool 2. During the core making process, start the collection fan 17 and the intake valve (the first intake valve 18 and / or the second intake valve 19), close the exhaust fan 10 and the exhaust valve (the first exhaust valve 7 and / or the second exhaust valve 8), and collect the intermittently generated tail gas containing triethylamine into the soft bag (the first soft bag 5 and / or the second soft bag 6). When the soft bag bulges with a certain amount of tail gas, close the collection fan 17 and the intake valve, and perform acid solution spraying.

[0026] First, start the first spray pump 15, so that the acid solution (phosphoric acid aqueous solution) is atomized and sprayed on the tail gas in the soft bag by the first spray pipe 13 and the water mist nozzle 4. After atomized spraying for a certain time, start the second spray pump 16, and spray a large flow of phosphoric acid aqueous solution to deposit the acid mist generated by atomized spraying.

[0027] After spraying, open the exhaust fan 10 and the exhaust valve (the first exhaust valve 7 and / or the second exhaust valve 8), and discharge the qualified tail gas.

[0028] For large core shooters, two soft bags are provided, and the double soft bags are operated alternately to meet the long-term amine blowing process.

Claims

1. A waste gas washing and treatment system for a core shooter, characterized in that It includes an acid solution tank, a spray container, a tail gas collection device, a water mist spray device, a large-flow spray device and a discharge device. The spray container is connected to the tail gas collection device. A water mist spray device and a large-flow spray device are arranged between the acid solution tank and the spray container. The upper part of the spray container is connected to the discharge device; The spray container is a soft bag; The tail gas collection device includes a collection fan, and the outlet of the collection fan is connected to the spray container through an intake valve; The discharge device includes a discharge fan, and the discharge fan is connected to the spray container through a discharge valve; During the core-making process, start the collection fan and the intake valve, close the discharge fan and the discharge valve, collect the intermittently generated tail gas containing triethylamine into the spray container. When there is a certain amount of tail gas in the spray container, close the collection fan and the intake valve, and conduct acid solution spraying. First, start the water mist spray device to perform acid solution atomizing spraying on the tail gas in the spray container, then start the large-flow spray device to spray a large flow of phosphoric acid aqueous solution to deposit the acid mist generated by the atomizing spraying. After the spraying is completed, turn on the discharge fan and the discharge valve to discharge the qualified tail gas.

2. The core shooting machine tail gas washing and treatment system according to claim 1, characterized in that, Two spray containers are provided; 3. The core shooter tail gas washing and treatment system according to claim 1, characterized in that, The water mist spray device includes a first spray pump and a first spray pipe. The inlet and outlet of the first spray pump are respectively connected to the acid solution tank and the first spray pipe, and water mist nozzles are distributed on the first spray pipe.

4. The core shooting machine tail gas washing and treatment system according to claim 1, characterized in that, The large-flow spray device includes a second spray pump and a second spray pipe. The inlet and outlet of the second spray pump are respectively connected to the acid solution tank and the second spray pipe, and large-flow nozzles are distributed on the second spray pipe.

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