CN215962591U - Vacuum casting smoke dust treatment device - Google Patents

Abstract

The utility model relates to a device is administered to vacuum casting smoke and dust, including vacuum pipe, gas cooler, dust precipitator in advance, sack cleaner, vacuum pump system, control system and vacuum pump headtotail, characterized by vacuum jar, vacuum pipe, dust removal pipe, gas cooler, dust precipitator in advance, sack cleaner, vacuum pump system communicate in proper order, are provided with the dust removal diverter valve on the dust removal pipeline, and control system is connected with the dust removal diverter valve, gas cooler, dust precipitator in advance, sack cleaner, vacuum pump system constitute dust removal system, still are provided with feeding device, feeding device delivery outlet and the vacuum are covered reinforced structure cooperation, reinforced structure and the riser cooperation on the ingot mould. The device has the advantages of simple structure, convenience in use, low cost and small influence on the process flow.

Description

Vacuum casting smoke dust treatment device

Technical Field

The application relates to a vacuum casting smoke dust treatment device, which is mainly suitable for treating smoke generated by feeding a heating agent into a riser during vacuum steel ingot production.

Background

After the vacuum casting is finished, a heating agent and a heat preservation agent are needed to be added into the riser of the ingot mold. The heating agent is added for the first time, after vacuum pouring is finished, vacuum is just broken, and the first heating agent is quickly added into a riser through a feeding device on a vacuum cover so as to prevent molten steel from contacting air. After the vacuum cover is removed, a second batch of heating agent is added into the riser according to the process requirements. In the process of adding the heating agent, very thick black smoke can be generated, serious pollution is caused to a vacuum pouring area and nearby workshops, and even the black smoke can be emitted from the roof of a factory building, so that the surrounding environment is greatly damaged.

The treatment difficulty of the smoke dust generated by vacuum casting and heating agent is very high, no relevant literature report is seen at present, and the common method according to the traditional thought is to arrange a movable dust hood on a vacuum casting area, adopt a fan to draft, and discharge the smoke dust after being dedusted by a deduster. However, the range of black smoke emission during vacuum casting is large, so that the requirement on the air volume of the system is high, and the arrangement of the movable dust hood is very difficult due to the fact that a travelling crane is frequently used above the vacuum casting. According to the field smoke dust range, 50 ten thousand meters of wind is needed for carrying out dry distillation/h by adopting the bag dust removal system, about 600 ten thousand of engineering investment is needed, and the installed power is about 1000 KW. The use cost of the dust removal system is only 250 yuan/time (not including the daily maintenance of a cloth bag and the secondary transportation treatment cost of dust collection) according to the fact that the heating agent smoking process is 30min and the electricity price is 0.5 yuan/degree. Therefore, the mode of moving the dust hood has high implementation difficulty and high cost, and influences normal process operation, so that the smoke pollution generated by burning the vacuum casting exothermic agent is not treated until now.

Disclosure of Invention

The technical problem that this application was solved is overcome the above-mentioned not enough that exists among the prior art, and provides a structure succinct, convenient to use, and is with low costs, administers the device to the vacuum casting smoke and dust that technological process influences for a short time.

The technical scheme adopted by the application for solving the technical problems is as follows: the utility model provides a device is administered to vacuum pouring smoke and dust, includes vacuum pipe, gas cooler, dust precipitator in advance, sack cleaner, vacuum pump system, control system and vacuum pump headtotail, characterized by vacuum tank, vacuum pipe, dust removal pipe, gas cooler, dust precipitator in advance, sack cleaner, vacuum pump system communicate in proper order, are provided with the dust removal diverter valve on the dust removal pipe, and control system is connected with the dust removal diverter valve, gas cooler, dust precipitator in advance, sack cleaner, vacuum pump system constitute dust removal system, still are provided with feeding device, feeding device delivery outlet and the vacuum lid reinforced structure cooperation, reinforced structure and the riser cooperation on the ingot mould.

The feeding device is provided with a first bin and a second bin, the second bin and the first bin are communicated through a second bin manual valve on the lower portion of the second bin, the first bin lower portion is provided with a first bin manual valve, the feeding structure is composed of a manual cover plate and a feeding chute, one end of the feeding chute is provided with the manual cover plate, an output port of the first bin is matched with one end of the feeding chute, and the other end of the feeding chute penetrates through a vacuum cover to be communicated to a riser. During vacuum casting, the feeding port is tightly sealed through the manual cover plate, after vacuum casting is finished and the vacuum is broken, the manual cover plate is opened, the manual valve of the first storage bin is opened again, and materials fall into the riser through the feeding chute, so that feeding of the first batch is completed.

After the first batch of heating agent is added into the riser, the first batch of heating agent starts to burn and releases smoke dust under the action of high-temperature molten steel, and at the moment, a dust removal switching valve needs to be opened to start a vacuum pump system.

After the first batch of heating agent is fed, the steel ladle is lifted away from the vacuum cover by a crane, an operator opens the manual valve of the second storage bin after obtaining an instruction of a process worker, and the second batch stored in the second storage bin is fed into the riser through the first storage bin and the feeding chute.

The gas cooler adopts a tubular heat exchanger.

The pre-dust collector is of a metal filter screen structure.

The bag of the bag-type dust collector adopts a membrane-covered filter material, so that the dust with the micron level can be effectively removed.

When the vacuum pump system is started, the air speed at the guide hole on the vacuum cover is 20-25 m/s.

Compared with the prior art, the application has the following advantages and effects: the structure is succinct, convenient to use, and is with low costs, utilizes vacuum pouring device vacuum lid as the entrapment cover, adopts one set of dust removal pipeline, utilizes the vacuum pipeline to couple together vacuum tank and vacuum pump station. The dust removal switching valve is arranged on the dust removal pipeline, and the switching of vacuum/dust collection working conditions can be performed.

Drawings

FIG. 1 is a schematic diagram of the system of the present application.

Fig. 2 is a schematic view of the work station elevation (vacuum casting apparatus) of the present application.

In the figure: 1-feeding device, 1-1-first bin, 1-11-manual valve of first bin, 1-2-second bin, 1-21-manual valve of second bin, 2-vacuum cover, 21-diversion hole on vacuum cover, 22-feeding structure on vacuum cover, 221-manual cover plate, 222-feeding chute, 3-vacuum tank, 4-ingot mould, 41-riser, 5-gas cooler, 6-pre-dust remover, 7-bag dust remover, 8-vacuum pump system, 81-water ring pump, 82-water outlet, 83-water pool, 84-working water tank, 9-dust-removing switching valve (pneumatic vacuum butterfly valve), 10-dust-removing pipeline, 11-vacuum pipeline, 12-air breaking valve, VC-vacuum casting device.

Detailed Description

The present application will be described in further detail below with reference to the accompanying drawings by way of examples, which are illustrative of the present application and are not limited to the following examples.

Referring to fig. 1 to 2, the present embodiment is provided with a feeding device 1, a vacuum pipeline 11, a dust removal pipeline 10, a gas cooler 5, a pre-dust remover 6, a bag-type dust remover 7, a vacuum pump system 8, a compressed air system, and a control system, wherein an output port of the feeding device 1 is matched with a feeding structure 22 on a vacuum cover 2, and the feeding structure 22 is matched with a riser 41 on an ingot mold 4.

The atmosphere enters the vacuum tank 3 through the diversion holes 21 on the vacuum cover 2 to support combustion for the heating agent.

Feeding device 1: in order to realize feeding of a heating agent into a riser 41 of the ingot mould 4 for solidification of a steel ingot, a set of feeding device 1 needs to be added on the vacuum cover 2. The feeding device 1 is of a double-bin structure and is provided with a first bin 1-1 and a second bin 1-2, the first bin 1-1 and the second bin 1-2 are communicated up and down through a manual valve 1-21 of the second bin, a manual valve 1-11 of the first bin is arranged below the first bin 1-1, and an output port 1-1 of the first bin (an output port of the feeding device 1) is matched with the feeding structure 22.

The vacuum cover 2 is provided with a feeding structure 22 which consists of a manual cover plate 221 and a feeding chute 222.

The total amount of the heat-generating agent is 1/3 in the first silo 1-1 and 2/3 in the second silo 1-2 according to the production process instruction before vacuum casting.

During vacuum casting, the manual cover plate 221 on the vacuum cover 2 is closed. After pouring, the vacuum system is closed, then the blank is broken through the blank breaking valve 12, the manual cover plate 221 is opened, the manual valve 1-11 of the first storage bin is opened, the first batch of heating agent is rapidly added into the riser 41 through the feeding chute 222, the steel ladle is lifted away, the manual valve 1-21 of the second storage bin is opened, and the second batch of heating agent is added into the riser 41 through the first storage bin 1-1 and the feeding chute 222.

Gas cooler 5: the temperature of the flue gas generated by burning the exothermic agent is very high, and in order to protect the subsequent bag-type dust collector 7 from being burnt, the temperature of the waste gas needs to be reduced to 130 ℃ for one time, so that the damage of the filter bag is avoided. In order to effectively reduce the gas temperature, the gas cooler 5 employs a tube heat exchanger. In order to facilitate the ash removal of the gas cooler 5, the waste gas flows in the heat exchange pipe, and the cooling water flows out of the heat exchange pipe. In order to reduce the gas resistance drop, the waste gas flow area of the heat exchange tube must be ensured.

A pre-dust remover 6: the smoke dust generated by the combustion of the exothermic agent contains part of large-particle high-temperature substances which are easily burnt on the filter bag once being attached to the filter bag. To further protect the bag-type dust collector 7, it is necessary to filter out this large particles before the exhaust gas enters the bag. Therefore, 1 pre-precipitator 6 is provided on the exhaust line. Dust remover 6 is the metal screen structure in advance, and in order to prevent that the large granule from attaching to cause the resistance to increase on the silk screen, influence dust removal effect, this device adopts special structure, divide into two parts with the filter screen, uses half filter screen earlier in earlier stage, in case after the resistance grow, switches to half filter screen again. The device is also provided with a back-blowing and vibrating ash removal device, and can clean the filter screen in the production gap.

7, a bag-type dust collector: the smoke dust is the most main pollutant generated after the heating agent is added to the vacuum casting riser, the dust is removed and filtered by a cloth bag, and the treated tail gas can be discharged to the atmosphere after the content of particulate matters in the tail gas is qualified. The system adopts the bag-type dust collector 7 to filter dust in waste gas, and the bag of the bag-type dust collector 7 adopts a film-coated filter material, so that the dust of micron level can be effectively removed. In the production gap, dry and impurity-free compressed air is adopted for pulse back blowing to blow off the deposited dust on the cloth bag and the deposited dust is collected into an ash hopper.

The vacuum pump system 8: the vacuum pump is adopted to provide negative pressure for the vacuum casting dust suction device, so that the flue gas can be collected, treated and discharged up to the standard. The vacuum pump station can be constructed by selecting special equipment such as a multistage centrifugal fan, a high-pressure Roots fan, a vortex fan, a water ring vacuum pump and the like according to actual working conditions. The air volume of the vacuum pump system 8 is selected according to the condition that the air speed at the position of the guide hole 21 on the vacuum cover 2 is 20-25 m/s.

The invention selects a water ring pump as an example, the water ring pump needs to be installed in a vacuum pump chamber (sound insulation and ventilation), and the vacuum pump station comprises a connecting vacuum pipeline, a cooling water pipeline, a valve, a connector and the like.

A compressed air system: the compressed air system is the power of all pneumatic vacuum butterfly valves, is led out from a factory pipe network, is distributed by a compressed air distributor and is connected to the pneumatic vacuum butterfly valves through electromagnetic reversing valves. The other path of compressed air is led out by a factory pipe network, is connected to a bag-type dust collector and a pre-dust collector after reaching a gas storage tank and a purification device, and is used for back flushing and dust removing of a filter screen.

This application control system, vacuum system, compressed air system, vacuum pump system 8 all adopt prior art, and gas cooler 5, dust precipitator 6, sack cleaner 7, vacuum pump system 8 constitute dust pelletizing system in advance. This application ingenious utilization vacuum lid provides negative pressure and amount of wind as flue gas entrapment cover, chooses for use big pressure differential vacuum pump system, with the effective entrapment of flue gas and the improvement discharge to reach standard of vacuum casting rising head with the production of exothermic compound, provides a feasible treatment scheme for puzzlement vacuum steel ingot production environmental pollution problem of a specified duration.

All simple variations and combinations of the technical features and technical solutions of the present application are considered to fall within the scope of the present application.

Claims (5)

1. The utility model provides a device is administered to vacuum pouring smoke and dust, includes vacuum pipe, gas cooler, dust precipitator in advance, sack cleaner, vacuum pump system, control system and vacuum pump headtotail, characterized by: vacuum tank, vacuum pipeline, dust removal pipeline, gas cooler, dust precipitator in advance, sack cleaner, vacuum pump system communicate in proper order, are provided with the dust removal diverter valve on the dust removal pipeline, and control system is connected with the dust removal diverter valve, gas cooler, dust precipitator in advance, sack cleaner, vacuum pump system constitute dust pelletizing system, still are provided with feeding device, feeding device covers reinforced structure cooperation on with the vacuum, reinforced structure and the rising head cooperation on the ingot mould.

2. The vacuum casting fume treatment device according to claim 1, wherein: the feeding device is provided with a first bin and a second bin, the second bin and the first bin are communicated through a second bin manual valve on the lower portion of the second bin, the first bin lower portion is provided with a first bin manual valve, the feeding structure is composed of a manual cover plate and a feeding chute, one end of the feeding chute is provided with the manual cover plate, an output port of the first bin is matched with one end of the feeding chute, and the other end of the feeding chute penetrates through a vacuum cover to be communicated to a riser.

3. The vacuum casting fume treatment device according to claim 1, wherein: the gas cooler adopts a tubular heat exchanger.

4. The vacuum casting fume treatment device according to claim 1, wherein: the pre-dust collector adopts a metal filter screen structure.

5. The vacuum casting fume abatement apparatus of any one of claims 1 to 4, wherein: the cloth bag of the cloth bag dust collector adopts a film-coated filter material.

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