CN105854486A - Waste heat recycling type waste gas treating device for setting machine - Google Patents

Abstract

The invention relates to a waste heat recycling type waste gas treating device for a setting machine. A rough filtration device is connected to the outlet end of an air inlet pipe. The outlet end of the rough filtration device is connected to the inlet section of a waste heat recycling device, and high-temperature waste gas energy is efficiently recycled through a heat pipe. Cooled waste gas enters a filter tower. A spray generator, a spraying device and two stages of high-voltage static devices are arranged in the filter tower from bottom to top. Accordingly, waste gas temperature is further decreased, oil smoke in waste gas is removed, the treated waste gas reaches exhausting standards, and finally the waste gas is exhausted into atmosphere through an air supply pipe. Hot water produced in the high-temperature waste gas waste heat recycling process is used for being supplemented to printing and dyeing hot water needed by printing and dyeing enterprises. The manufacturing and installation cost is low. No induced draught system is needed, fire hazards in the waste gas treating process of the setting machine are thoroughly avoided, the waste gas treating system is simplified, and therefore the waste heat recycling type waste gas treating device is small in occupied area, saves energy and waster, can achieve up-to-standard release so as to achieve the effect of environmental protection, and is also applicable to production and manufacturing industries producing supersaturated steam and oil and dust containing gas.

Description

A waste heat recovery type setting machine exhaust gas treatment device

technical field

The invention relates to an energy-saving and environment-friendly device, which is mainly used for waste heat recovery and utilization of high-temperature oily dust-containing waste gas generated during the operation of printing and dyeing industry setting machine equipment, oil fume oil recovery and purification treatment equipment.

Background technique

With the continuous and rapid development of my country's industry, industrial production has also brought a certain degree of pollution to the environment, especially the problem of exhaust gas. If it is not purified and treated, it will be directly discharged into the atmosphere, which will seriously endanger people's health.

The waste gas emitted by the setting machine in the printing and dyeing industry is a high-temperature hot gas, and its temperature is about 180 °C. Exhaust gas contains various harmful components such as oil fume, dust and fabric fibers. If the exhaust gas is directly discharged into the atmosphere, it is neither environmentally friendly nor energy-saving. Therefore, the exhaust gas of the current setting machine is required to meet the standard discharge in order to save energy and reduce environmental pollution.

For the current exhaust gas treatment of setting machines, most printing and dyeing enterprises simply suck the exhaust gas from the pipeline into the filter screen through the fan, and discharge it directly into the atmosphere after simple separation by the filter screen. The equipment is simple, the filtering effect is poor, and the gas discharged into the atmosphere contains a lot of fiber dust and smoke oil, and the smoke is blue-gray gas. Not only that, the air duct of the air induction system of the exhaust gas treatment system is too long, the diameter is large, the capacity of flammable and explosive gas is large, and oil stains and fiber dust are easy to accumulate on the wall of the air duct. Moreover, the waste gas generated by multiple setting machines is first collected into the wind collecting box through the air duct of the induced draft system, and then the waste gas stored in the wind collecting box is introduced into the purification device for treatment and discharge. There are great hidden dangers in such a treatment process. When the exhaust gas concentration reaches the explosion limit or fire conditions, an explosion or fire accident will occur in case of static sparks or open flames and self-igniting open flames caused by excessive heat accumulation.

In order to improve economic benefits, in large-scale printing and dyeing enterprises, the exhaust gas of the existing setting machine has been comprehensively treated, mainly including recovering the waste heat of the exhaust gas and the smoke oil in the exhaust gas, and then atomizing and washing through the purifier or high-voltage electrostatic device Purify exhaust gas and meet emission standards. According to the actual survey, considering the operation of the actual setting machine and the fire and explosion protection requirements of printing and dyeing enterprises, the existing waste heat recovery equipment cannot make full use of the heat energy of high-temperature exhaust gas. After heat recovery, the exhaust gas is sent to the purifier, where it is washed and purified , The temperature of the oil-water mixture from the purifier is still high, around 70°C, it needs to be cooled by fans and radiators to circulate the water, and the hot air after cooling is discharged, which makes the valuable heat energy directly wasted. In addition, waste gas waste heat recovery and e-liquid recovery cannot be realized at the same time. The water droplets and oil droplets condensed in the existing e-liquid recovery device are generally discharged into the ditch through conduits, causing waste and secondary pollution.

In general, the existing exhaust gas treatment equipment is scattered, with long pipelines and large heat dissipation areas, oily and dripping pipelines, some equipment occupy a large area, low heat recovery rate, and poor smoke oil recovery rate.

Contents of the invention

In order to overcome the defects of the prior art such as low recovery efficiency of high-temperature waste gas waste heat, low oil recovery rate and complex waste gas treatment system, the purpose of the present invention is to provide a device for waste gas treatment and waste heat recovery of a setting machine. It can be effectively improved, and at the same time, the recovery rate of soot oil is increased and the effect of exhaust gas purification is enhanced.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A waste heat recovery type waste gas treatment device for a sizing machine, including a waste heat recovery device, a waste gas purification device and a smoke oil recovery device, wherein:

The waste heat recovery device is a rectangular box. The box is divided into upper and lower layers by metal plates. The upper layer is the water channel, and the lower layer is the high-temperature exhaust gas flow channel. Heat pipes are arranged vertically in the box. There is an air inlet, with a filter screen in front of the air inlet, and a hot air outlet on the other side;

The exhaust gas purification device includes a filter tower, a spray head, a spray head and a high-voltage electrostatic device. The filter tower is a cylindrical structure, and a spray head, a spray head, a first-level high-voltage electrostatic device and a second-level high-voltage electrostatic device are arranged from bottom to top. device, the hot air outlet of the waste heat recovery device is connected to the exhaust gas inlet at the lower part of the filter tower through a pipeline;

The smoke oil recovery device includes an oil-water collection device and an oil-water separation box. The primary oil-water collection device is set at the lower part of the spray head, and the secondary oil-water collection device is set at the lower part of the spray head. Both the primary oil-water collection device and the secondary oil-water collection device use annular inverted funnels The primary oil-water collection device is connected to the top of the primary oil-water separation tank through pipes, and the bottom of the primary oil-water collection device is higher than the top of the primary oil-water separation tank, so that the oil and water in the primary oil-water collection device flow back to the primary oil-water separation tank by gravity. tank; the secondary oil-water collection device is connected to the top of the secondary oil-water separation box through pipelines, and the bottom of the secondary oil-water collection device is higher than the top of the secondary oil-water separation box, so that the oil and water in the secondary oil-water collection device flow back to the secondary oil-water by gravity separation box;

The high-temperature exhaust gas is filtered through the filter to remove large impurities. Using the principle of high-efficiency heat transfer of the heat pipe, the high-temperature exhaust gas is cooled by the heat pipe and enters the filter tower. The cold water on the upper layer of the waste heat recovery device is heated and used to supplement the hot water required for printing and dyeing; Atomized washing, soot oil and volatile gas in the exhaust gas fall into the primary oil-water collection device with water; after the atomized exhaust gas is sprayed by the spray head to demist, most of the water is collected by the secondary oil-water collection device; The final exhaust gas is captured by the first-level high-voltage electrostatic device and the second-level high-voltage electrostatic device to capture fine oil fumes and remove part of the odor in the exhaust gas. The purified exhaust gas is discharged into the atmosphere from the top of the filter tower through the exhaust pipe.

In the present invention, a guide plate is provided in the upper layer of the waste heat recovery device, so that the cold water flows in an "S" shape in the upper layer of the waste heat recovery device, and the number of guide nodes can be 2, 4 or even more; In the water, a temperature control valve is installed in the water outlet pipeline, and a float valve is installed in the water inlet pipeline.

In the present invention, the heat pipes located in the lower layer of the waste heat recovery device are placed in the high-temperature exhaust gas flow path in the form of wound fins.

In the present invention, multiple spray heads are used, and the spray surface covers the cross section of the entire filter tower.

In the present invention, multiple spray heads are used, and the spray surface covers the entire cross section of the filter tower.

In the present invention, the spray head and the shower head are respectively connected with corresponding water pumps through pipelines.

In the present invention, both the first-stage oil-water separation tank and the second-stage oil-water separation tank are provided with partitions higher than the water level, and holes are opened at the bottom, and a water pump is connected through the hole, and the water is delivered to the spray head or spray nozzle by the water pump. Head; primary oil-water separation tank or secondary oil-water separation tank is equipped with oil-water separation tank inlet valve, oil-water separation tank drain valve and manual control valve.

In the present invention, an overflow pipe is arranged between the primary oil-water separation box and the secondary oil-water separation box.

Since the high-temperature exhaust gas discharged from the setting machine contains oily smoke oil and cloth fibers, a coarse filter device is installed before entering the waste heat recovery box. Under the separation of the filter screen of the coarse filter device, the large fiber dust is preliminarily filtered, thereby avoiding the large fiber and oil Droplets are pasted on the heat exchange tubes to increase the heat transfer resistance and reduce the heat transfer effect. At the same time, it can also avoid the danger of fire and explosion caused by the long-term accumulation of large fibers and oil droplets. In addition, the filter screen is easy to disassemble, which is convenient for maintenance personnel to replace frequently.

In order to effectively recover the heat energy of high-temperature exhaust gas, and at the same time make the heat exchanger simple and easy to maintain, the waste heat recovery box is designed with upper and lower layers, and the cold end of the heat pipe is placed in the lower layer of the box for heat exchange of high-temperature exhaust gas and absorption of exhaust gas heat energy. , to reduce the exhaust gas temperature. The heat energy of the waste gas absorbed by the heat pipe is transferred to the hot end of the upper layer of the cabinet through the efficient heat conduction of the heat pipe, and the hot end of the heat pipe exchanges heat with the cold water, and the heated cold water is used for preheating the hot water required for printing and dyeing. In order to improve the heat exchange efficiency between the heat pipe and the exhaust gas, the cold end of the heat pipe, that is, the lower part, adopts reinforced winding fins; and in order to improve the heat exchange efficiency between the heat pipe and the cold water, the upper water side of the rectangular box adopts a deflector to make the cold water flow in the waste heat recovery device Make a "Zigzag" shape flow, increase the heat exchange time, and increase the outlet water temperature. In addition, a temperature control valve is installed in the water outlet pipeline. When the temperature reaches the set value, the water pump is started to drain water, so that the temperature of the water outlet is stable. The water inlet pipeline is equipped with a float control valve. When the liquid level is lower than the set value, the valve is opened to enter water to ensure that the liquid level on the water side maintains a certain height. Through the heat exchange method of the heat pipe, the high-temperature exhaust gas can be efficiently preheated to supplement the hot water required for printing and dyeing, which is conducive to the comprehensive utilization of energy in printing and dyeing enterprises, and at the same time reduces the temperature of the flue gas entering the purification filter cylinder, and improves the oil recovery rate. Environmental pollution is avoided.

In order to improve the recovery efficiency of soot oil in the exhaust gas, the exhaust gas purification device adopts a cylindrical filter tower, which is equipped with a spray head, a spray head and a two-stage high-voltage electrostatic device from bottom to top. After the gas containing dust particles and soot oil passes through the water mist layer formed by the spray device, the dust and soot oil are accumulated and adsorbed on the oil mist adsorption layer. Due to the action of gravity, the oily or dusty large particles settle under the spray head. In the primary oil and water collection device. At the same time, due to the gasification of part of the water mist by the exhaust gas, the temperature of the exhaust gas is further reduced. The spray head placed above the spray head forms a water curtain, which can effectively further enrich the rising exhaust gas oil droplets and smaller mist droplets in the water, and collect them by the secondary oil-water collection device. After two times of water treatment, the waste gas still has a small amount of harmful insoluble gas, such as odor. After passing through the high-voltage electrostatic device twice, the final purification efficiency of the waste gas is improved, and the waste gas is finally treated to the emission standard.

In order to effectively recover the fume oil, an inclined oil-water collection device is installed in the filter tower to collect the oily wastewater formed by spraying and spraying. The oily waste water passes through the pipeline and enters the oil-water separation tank respectively. A partition is set in the middle of the oil-water separation box. Using the principle that the density of e-liquid is lower than that of water, the e-liquid is automatically discharged into the oil-containing side. At the bottom of the oil-water separation tank, there is a pipeline connected to the water pump, and the water pump sends the separated water to the spray head or shower head to continue washing and absorbing the soot oil in the exhaust gas. Since spraying requires more water to evaporate, spraying makes the rising water droplets caused by spraying continue to settle, and the waste water collected by the secondary oil-water separation box is often more than the required spray water. The overflow pipe is used to drain the excess water from the secondary oil-water separation box. Overflow to the primary oil-water separation tank. At the same time, in order to ensure the stable degreasing effect of the water in the oil-water separation tank, an inlet and outlet water valve is set for regular water change.

The beneficial effect of the present invention is that: the product developed by using this technology has a thermal energy recovery rate of 85%, a dust purification efficiency of 99%, and an oil mist removal rate of 99%. It can be seen that the present invention can effectively recover the heat energy of the high-temperature waste gas of the setting machine, improve the recovery rate of soot oil, and reduce the manufacturing and installation costs of the whole set of equipment. Compact structure, small footprint, energy-saving, water-saving, easy to manufacture, install and maintain, can achieve discharge standards, in order to achieve the effect of environmental protection. This equipment is also suitable for the manufacturing industry where supersaturated steam produces oily and dusty gas.

Description of drawings

Fig. 1 is a kind of structural representation of the present invention:

Numbers in the figure: 1 is the filter screen, 2 is the waste heat recovery device, 3 is the heat pipe, 4 is the filter tower, 5 is the spray head, 6 is the secondary oil and water collection device, 7 is the spray head, 8 is the first-level high-voltage electrostatic device , 9 is the secondary high-voltage electrostatic device, 10 is the spray pump, 11 is the secondary oil-water separation box, 12 is the overflow pipe, 13 is the water inlet valve of the secondary oil-water separation box, 14 is the drain valve of the secondary oil-water separation box, 15 16 is an oil-water separation box drain valve, 17 is an oil-water separation box inlet valve, 18 is a spray nozzle valve, 19 is an oil-water collection device, and 20 is a deflector.

detailed description

The structural design principle and working principle of the present invention will be described in further detail below in conjunction with the accompanying drawings.

Example 1: Set up a platform or bracket on the top of the sizing machine to place the waste gas treatment and waste heat recovery device of the sizing machine, connect the air inlet of the waste gas and waste heat recovery device to the exhaust port of the sizing machine, and filter the air inlet with a filter 1 The large-particle debris discharged with the exhaust gas, such as wool fibers, and the high-temperature exhaust gas that has been coarsely filtered enter the waste heat recovery device 2 to exchange heat with the heat pipe 3 . Utilizing the efficient heat transfer principle of the heat pipe, the heat pipe heats the cold water flowing through it, and the heated cold water is used to supplement the hot water required for printing and dyeing.

After the high-temperature waste gas is cooled by the heat pipe 3, the temperature drops and continues to enter the filter tower 4. In the filter tower 4, the waste gas is first atomized and washed by the spray head 5. During the atomization and washing process of the spray head 5, the soot oil and other volatile gases in the waste gas are solidified and fall with the water, and are collected by the primary oil-water collection device 19. At the same time, part of the mist is gasified to reduce the temperature of the exhaust gas. After the atomized and washed waste gas is sprayed with water by the spray head 7 to demist, most of the water is collected by the secondary oil and water collection device 6 . The exhaust gas is cooled and purified step by step through spraying and spraying, and the temperature of the exhaust gas after cooling is below 50°C. After the waste gas has been deoiled by water for two times, the first-level high-voltage electrostatic device 8 and the second-level high-voltage electrostatic device 9 capture the fine oil fume and remove part of the odor in the waste gas twice, and at this temperature, the high-voltage electrostatic device will not It will adhere to oil droplets and maintain a high purification efficiency for a long time. The purified waste gas that meets the standard is discharged into the atmosphere through the exhaust pipe.

The oil and water collected by the spray is deposited in the groove of the primary oil and water collecting device 19, and finally passes through the drain of the shell of the filter tower 4, and flows back into the primary oil and water separation tank 16 through the pipeline gravity. The oil and water collected by spraying is deposited in the groove of the secondary oil and water collecting device 6, and finally passes through the drain of the shell of the filter tower 4, and flows back into the secondary oil and water separation tank 11 through the pipeline gravity.

The structure of the secondary oil-water separation box 11 and the primary oil-water separation box 16 is roughly the same, using a separation plate, and using the principle that oil is lighter than water, the collected waste oil is discharged into the oil side to realize oil-water separation. In the oil-water separation box, there is a filter screen to filter sundries, and a water outlet is connected to the water pump at the lower end. The secondary oil-water separation tank 11 and the primary oil-water separation tank 16 respectively recirculate the water in the oil-water separation tank to the spray head 5 and the spray head 7 through the spray water pump 10 and the spray head valve 18 to wash the waste gas.

Since the oil-water collected by the secondary oil-water collection device 6 is obviously more than the spray water volume of the spray head 7, the return water volume of the secondary oil-water separation tank 11 is more than the pumped water volume. And the oil-water collected by the primary oil-water collecting device 19 is obviously less than the spraying water quantity of the spray head 5, so the return water quantity of the primary oil-water collecting box 16 is less than the spraying water quantity. Considering comprehensively, the overflow pipe 12 is used to adjust the water volume of the two oil-water collection devices, so that the primary oil-water collection device 19 does not need to replenish water frequently, thereby achieving the purpose of saving water.

In addition, considering that the water used to wash the exhaust gas cannot be used for a long time, otherwise the oil removal efficiency will be reduced, so the water in the oil-water separation device needs to be replaced regularly. Install the water inlet valve 17 of the primary oil-water separation box, the water inlet valve 13 of the secondary oil-water separation box, the drain valve 15 of the primary oil-water separation box, and the drain valve 14 of the secondary oil-water separation box before and after the two oil-water collection devices, so as to realize the purpose of regular water change .

Claims (8)

1. A waste heat recovery type sizing machine exhaust gas treatment device, comprising a waste heat recovery device, a waste gas purification device and a smoke oil recovery device, characterized in that: The waste heat recovery device is a rectangular box. The box is divided into upper and lower layers by metal plates. The upper layer is the water channel, and the lower layer is the high-temperature exhaust gas flow channel. Heat pipes are arranged vertically in the box. There is an air inlet, with a filter screen in front of the air inlet, and a hot air outlet on the other side; The exhaust gas purification device includes a filter tower, a spray head, a spray head and a high-voltage electrostatic device. The filter tower is a cylindrical structure, and a spray head, a spray head, a first-level high-voltage electrostatic device and a second-level high-voltage electrostatic device are arranged from bottom to top. device, the hot air outlet of the waste heat recovery device is connected to the exhaust gas inlet at the lower part of the filter tower through a pipeline; The smoke oil recovery device includes an oil-water collection device and an oil-water separation box. The primary oil-water collection device is set at the lower part of the spray head, and the secondary oil-water collection device is set at the lower part of the spray head. Both the primary oil-water collection device and the secondary oil-water collection device use annular inverted funnels The primary oil-water collection device is connected to the top of the primary oil-water separation tank through pipes, and the bottom of the primary oil-water collection device is higher than the top of the primary oil-water separation tank, so that the oil and water in the primary oil-water collection device flow back to the primary oil-water separation tank by gravity. tank; the secondary oil-water collection device is connected to the top of the secondary oil-water separation tank through pipelines, and the bottom of the secondary oil-water collection device is higher than the top of the secondary oil-water separation tank, so that the oil and water in the secondary oil-water collection device flow back to the secondary oil-water by gravity separation box; The high-temperature exhaust gas is filtered through the filter to remove large impurities. Using the principle of high-efficiency heat transfer of the heat pipe, the high-temperature exhaust gas is cooled by the heat pipe and enters the filter tower. The cold water on the upper layer of the waste heat recovery device is heated and used to supplement the hot water required for printing and dyeing; Atomized washing, soot oil and volatile gas in the exhaust gas fall into the primary oil-water collection device with water; after the atomized exhaust gas is sprayed by the spray head to demist, most of the water is collected by the secondary oil-water collection device; The final exhaust gas is captured by the first-level high-voltage electrostatic device and the second-level high-voltage electrostatic device to capture fine oil fumes and remove part of the odor in the exhaust gas. The purified exhaust gas is discharged into the atmosphere from the top of the filter tower through the exhaust pipe. 2. The integrated device for waste heat recovery and purification of waste gas from setting machine according to claim 1, characterized in that: a deflector is provided in the upper layer of the waste heat recovery device, so that the cold water flows in an "S" shape in the upper layer of the waste heat recovery device, The number of diversion joints is 2, 4 or even more; the upper part of the heat pipe is submerged in water, the outlet pipeline is equipped with a temperature control valve, and the water inlet pipeline is equipped with a float valve. 3. The integrated device for waste heat recovery and purification of waste gas from setting machine according to claim 1, characterized in that: the heat pipe located in the lower layer of the waste heat recovery device is placed in the high-temperature waste gas flow path in the form of wound fins. 4. The waste gas treatment and waste heat recovery device of the setting machine according to claim 1, characterized in that: multiple spray heads are used, and the spray surface covers the entire cross section of the filter tower. 5. The waste gas treatment and waste heat recovery device of the setting machine according to claim 1, characterized in that: multiple spray heads are used, and the spray surface covers the entire cross section of the filter tower. 6. The exhaust gas treatment and waste heat recovery device of the setting machine according to claim 1, characterized in that: the spray head and the shower head are respectively connected to corresponding water pumps through pipelines. 7. The exhaust gas treatment and waste heat recovery device of the setting machine according to claim 1, characterized in that: both the primary oil-water separation box and the secondary oil-water separation box are equipped with partitions higher than the water level, and the bottom is opened. The water pump is connected through the hole, and the water is delivered to the spray head or spray head by the water pump; the primary oil-water separation tank or the secondary oil-water separation tank is equipped with an oil-water separation tank inlet valve, an oil-water separation tank drain valve and a manual control valve. 8. The waste gas treatment and waste heat recovery device of the setting machine according to claim 1, characterized in that: an overflow pipe is set between the primary oil-water separation box and the secondary oil-water separation box.