KR100298225B1 - Apparatus for evaporating and concentrating the waste water by direct fire - Google Patents

Abstract

The present invention scrapes the scale generated by heating the concentrated water to further evaporative concentration as a scraper, which can be transported as a conveyor having a screw in a solid state and discharged to the outside. A direct evaporation concentrator.

The present invention, the burner (10) for providing a heat source; As the heat source of the burner 10 is provided an evaporation concentration tank 20a provided with a separation plate 23 for partitioning the combustion chamber 21 to be heated and the concentration chamber 22 to which the concentrated water is supplied, and the combustion chamber 21 has exhaust gas. Evaporation concentration unit 20 for evaporating the moisture of the concentrated water by having a stack 29 for discharging the outside; And a plurality of cylinder members 32a and 32b for reciprocating a plurality of scrapers 31a and 31b in contact with the bottom surface of the separation plate 23 and the inner surface of the concentration chamber 22. 23 on both sides of the conveyor 23a and 34b to which the scale removed by the scrapers 31a and 31b falls, and the scales are transferred to the outlets 36a and 36b. A removal unit 30 having screws 33a and 33b rotated by the discharge unit to discharge the scale to the outside; And a seed tank having a seed tank 41 storing the seed material introduced into the concentration chamber 22 and having a metering controller 44 which receives a measured value of the seed material and controls the amount of seed material to be input. Provides a direct evaporation concentrator comprising (40).

Description

Direct evaporation concentrator {APPARATUS FOR EVAPORATING AND CONCENTRATING THE WASTE WATER BY DIRECT FIRE}

The present invention relates to an apparatus for condensing waste water, landfill leachate, production process water, etc. without using a heating medium and burning the combustion gas directly as a heat source thereof, more specifically, when the concentrated water is heated and further evaporated. The present invention relates to a direct-type evaporation concentrator which scrapes a scale as a scraper and transfers it as a conveyor having a screw in a solid state to be discharged to the outside.

In general, a large amount of wastewater generated in factories, landfills, etc. is first treated in a separator and discharged into concentrated water. By heating it further, the steam is evaporated and concentrated to be discharged to a solid state. Environmental facilities such as vacuum evaporators have been used.

1 is a schematic configuration diagram illustrating a solidification process of concentrated water using a general steam-driven vacuum evaporator. As shown in FIG. 1, the first treated concentrated water is circulated by a circulation pump 4a and a concentration tank 4. It is sprayed through the nozzle (4d) to the upper surface of the heat transfer surface and evenly sprayed on the heat transfer surface, steam is supplied to the inside of the heat transfer tube with a high enthalpy steam produced by the boiler (5) supplied steam Steam, the enthalpy of which has been lowered, is recovered to the boiler (5).

In addition, steam generated while the concentrated water sprayed on the heat transfer surface is evaporated by a heat source of steam supplied into the condenser 6, which is a heat exchanger, exchanges heat with the cooling water passing through the condenser 6, and the discharged condensate is recycled. do. At this time, when the level of the concentration tank 4 is lowered by the amount of evaporated and sensed by the level switch 4b disposed at an appropriate position, the opening valve 4b is opened to supply the concentrated liquid to be concentrated into the concentration tank 4. do.

In order to lower the evaporation temperature, a vacuum may be applied to the condenser 6 as a vacuum pump 6a or a steam ejector. Cooling water heat-exchanged with the evaporated steam in the condenser (6) is circulated to the cooling tower (6b) to lower the temperature and then supplied to the condenser (6), the shortage is often supplemented with fresh cooling water.

On the other hand, the water is evaporated while being circulated by the circulation pump (4a) and the sludge in the remaining concentrated water is bypassed to a separate dryer (7) for easy transport and handling, and solidified to greatly reduce the volume It is discharged to the outside.

However, such a conventional concentrator has a scale such as calcium, carbonate, calcium sulfate, and silica due to poorly soluble inorganic salts generated during concentration. Attached to the heat transfer surface or pipe inside the thickening tank (4) to reduce the heat transfer efficiency, the problem is that the operation of the state becomes impossible by closing the heat transfer tube when the scale is accumulated.

In addition, in the case of frequent chemical cleaning to remove scales attached to the heat transfer surface and pipes, the corresponding costs are added to increase the cost of maintaining the equipment and increase the operating cost due to the loss of opportunity. Since there is a need for a separate equipment such as a boiler 5 for producing steam and a dryer 7 for solidifying sludge generated in the concentrating tank 4, there is a problem in that facility investment costs are excessively spent.

Accordingly, the present invention has been made in order to solve the above problems, the object of the present invention is to evaporate and concentrate by heating the concentrated water directly as a burner using the landfill gas of the landfill as a heat source of the heat transfer surface of the concentration tank in which the concentrated water is stored, Scraping the sludge generated on the lower surface and the wall is transported and discharged as a screw and conveyor, and to provide a direct type evaporative concentrating device that can control the scale with high adhesion to improve work efficiency and reduce equipment maintenance costs.

1 is a schematic configuration diagram illustrating a solidification process of concentrated water using a general steam driven vacuum evaporator;

Figure 2 is an overall configuration showing a direct-type evaporation concentrator according to the present invention,

3 is a side view of the direct type vaporization apparatus according to the present invention seen from line A-A ',

Figure 4 is a perspective view showing the scraping operation of the scraper constituting the direct type vaporization thickening apparatus according to the present invention,

Figure 5 is a detailed view of the cylinder member constituting the direct type vaporization concentration apparatus according to the present invention,

Figure 6 is a detailed view of the seed portion constituting the direct type vaporization thickening apparatus according to the present invention.

Explanation of symbols on the main parts of the drawings

10 ........ burner 20a ....... evaporation concentration tank

21 ........ Combustion chamber 22 ........ Concentration chamber

23 ........ Separator 31a, 31b ... scraper

32a, 32b ... Cylinder member 33a, 33b ... screw

34a, 34b ... Conveyor 35a, 35b ... Motor member

36a, 36b ... outlet 41 ........ seed tank

42 ........ vertical 43 ........ load cell

44 ........ Weighing Controller 45 ........ Rotary Valves

In order to achieve the above object, the present invention,

In a facility for evaporating concentrated water to a heat source and discharging the remaining sludge in a solid state,

A burner providing a heat source;

An evaporation condenser provided with a separation plate partitioning between a combustion chamber heated as a heat source of the burner and a condensation chamber supplied with concentrated water, and the combustion chamber is provided with a stack for discharging exhaust gas to the outside to evaporate the moisture of the concentrated water. ;

A plurality of cylinder members for reciprocating a plurality of scrapers in contact with the bottom surface of the separation plate and the inner surface of the concentrating chamber, and on both sides of the separation plate, the conveyor and the scale to which the scale removed by the scraper falls to the outlet side A removal unit having a screw rotated by the motor member to transfer the discharge to the outside; And

A seed tank having a seed tank for storing the seed material introduced into the concentration chamber, the seed part having a weighing controller for receiving a measured value of the seed material to control the amount of seed material input; By providing an evaporation concentrator.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is an overall configuration showing a direct evaporation concentrator according to the present invention, Figure 3 is a side view of the direct evaporation concentrator according to the present invention seen from line A-A ', Figure 4 is according to the present invention Figure 6 is a perspective view showing the scraping operation of the scraper constituting the direct type evaporation concentrator, Figure 5 is a detailed view of the cylinder member constituting the direct type evaporation concentrator according to the present invention, Figure 6 is a direct evaporation according to the present invention It is a detail view of the seed part which comprises a thickening apparatus.

The apparatus 1 of the present invention, as shown in Figures 2 to 6, the burner 10 for providing a heat source, the evaporation concentrating portion 20, the evaporation concentration of the concentrated water is made, scraping off the attached scale to the outside It consists of the removal part 30 and the seed part 40.

That is, as shown in FIG. 2, the burner 10 has one end in which the ignition flame is injected and the outer surface of the combustion chamber 21 communicate with each other to provide a high temperature heat source to the combustion chamber 21 to be described later. Combustion gas supplied from the outside is stored, and the storage tank 9 which can adjust it to a constant supply pressure and supply amount is configured to be connected to each other, and the supply passage of the heat source is opened and closed between the storage tank 9 and the burner 10. And a control valve 9a that can be adjusted.

Then, the concentrated water supplied by the circulation pump (4a) as a heat source to evaporate concentrated evaporation concentration unit 20 to separate the sludge and pure water, such as ions, foreign matter, etc. contained in the concentrated water to each other is shown in FIGS. As shown in the drawing, the combustion chamber 21, the concentration chamber 22, and the evaporation concentration tank 20a integrally having a separation plate 23 separating them up and down are configured to include a lower portion of the evaporation concentration tank 20a. Combustion chamber 21 is heated to a high temperature by the heat source of the burner 10, the combustion exhaust gas is discharged to the outside through a stack (29) in communication with the outer surface of the combustion chamber (21). The concentrated chamber 22 constituting the upper portion of the evaporation concentration tank 20a is filled with concentrated water by a circulation pump 4a connected to the concentrated water supply line 4d, and the concentrated water filled therein is The water in the concentrated water is heated by the heat source of the burner 10 provided to the combustion chamber 21 side to evaporate and vaporize, and the remaining sludge and scale are evaporated from the bottom surface of the separation plate 23 or the concentration chamber 22. It will remain on or adhere to the wall.

In addition, the level switch 4c is provided to detect the level of the concentrated water in the concentration chamber 22, and when the lowest level L is sensed, the control valve 4e installed in the concentration supply line 4d is opened. When replenishing the brine and detecting the highest level (H), the control valve (4e) is closed to control the feedback to stop the supply of the brine (feedback). Here, the concentrated water supply line 4d for supplying the concentrated water into the concentration chamber 22 burns the burner 10 so as to improve the thermal efficiency in the concentration chamber 22 by increasing the water temperature during the supply of the concentrated water. It is preferable to be installed to pass through the stack 29 to discharge the high-temperature exhaust gas generated during.

Then, the removal unit 30 for removing the sludge or adhered scale remaining after evaporation of the water in the concentrated water, as shown in Figs. 4 and 5, the bottom surface of the separation plate 23 and the inside of the concentration chamber 22. A plurality of scrapers (31a) (31b) for scraping off the scale attached to the side, a plurality of cylinder members (32a) (32b) for reciprocating forward and backward, and the scraper (31a) (31b) It consists of screws (33a, 33b) for feeding the scale scraped off by.

The scraper (31a) (31b) is composed of a polygonal plate member in contact with the bottom surface and the bottom edge of the separation plate 23, the inner surface and one corner of the concentration chamber 22 is always in contact, the rear surface The rod members of the cylinder members 32a and 32b, which are reciprocally operated by pneumatic, hydraulic, or mechanical, respectively, are assembled and assembled, respectively, while the cylinder members 32a (for smooth scraping) are disposed between the scrapers 31a and 31b. A guider 39 parallel to the reciprocating direction of 32b) is provided.

Here, the reciprocating motion of the cylinder members (32a, 32b) can be made continuously or periodically by a timer, and in contact with the bottom surface of the separation plate 23 and the inner surface of the concentration chamber 22 It is preferable that the lower edge and one side corner of each scraper 31a and 31b to which friction is made are made of heat resistant and corrosion resistant material.

Conveyors 34a and 33b, which are orthogonal to the reciprocating direction of the scrapers 31a and 31b, are respectively provided on the left and right ends of the separating plate 23, and the conveyor 34 having a 'Ｕ'-shaped cross section is provided. Each upper end is installed so as not to protrude to the upper surface than the bottom surface of the separating plate 23 so that there is no interference with the reciprocating scrapers 31a and 31b. In addition, the screws 33a and 33b respectively installed on the conveyors 34a and 34b are connected to the motor members 35a and 35b, and the driving force of the motor members 35a and 35b to which external power is applied. As it is rotated in one direction, the scale dropped into the conveyors 34a and 34b by the scraping operation by the reciprocating motion of the scrapers 31a and 31b is installed at one end of the conveyors 34a and 34b. It is conveyed and discharged by the screws 33a and 33b toward the discharge ports 36a and 36b.

Here, the separator 23 has a lower slope than the upper end of the discharge port (36a, 36b) is formed, the predetermined angle (θ) of the inclination can be changed in accordance with the properties of the concentrated water to be concentrated The screw 33a, 33b is preferably made of a wear-resistant, corrosion-resistant material.

And, as shown in FIG. 5, the cylinder members 32a and 32b for generating the scraping operation by reciprocating the scrapers 31a and 31a respectively or simultaneously are concentrated in the concentration chamber 22 of the evaporation concentration tank 20a. The cylinder rods are fixedly installed on the support 38a installed on the outer surface, and the cylinder rods connected to the scrapers 31a and 31b are reciprocated in the holes of the connector 38b installed on the outer wall of the concentrating chamber 22. A plurality of packing members 38c and sealing members 38b are installed between the connector 38b and the contact surface of the cylinder rod to prevent leakage of the concentrated water.

In addition, the seed portion (40) is installed on the upper portion of the concentrated storage tank (20a) to make it difficult to attach the scale to easily perform a scraping operation for the scale attached to the bottom of the concentration chamber (22) And, to supply a seed (seed) to make it soft (seed), the seed tank 41 for storing a large amount of such a seed, as shown in Figure 6, the upper side of the evaporation concentration tank (20a) It is provided on a vertical stand 42 is installed vertically, the load cell 43 that can measure the weight of the seed stored in the seed tank 41 in the contact portion between the vertical stand 42 and the seed tank 41 A load cell is installed, and a weighing controller 44 for controlling the amount of seed agent input into the concentration chamber 22 is provided by receiving the measured value of the load cell 43. Here, the total weight of the seed agent is concentrated in the load cell 43 to know the weight of the stored seed agent.

The lower end of the inlet pipe 41a extending downward from the lower end of the seed tank 41 is inserted into the concentrating chamber 22, and the inlet pipe 41a is connected to the metering controller 44. A rotary valve 45, a flexible joint 46, and an automatic valve 47 controlled by opening and closing are provided.

On the other hand, a vacuum blower 6a for forcing the vapor of the concentrated water evaporated by the heat source in the evaporation concentration tank 20a to the heat exchanger 6 side along the exhaust pipe 6c is provided, and the heat exchanger 6 is forcibly Cooling water that is heat-exchanged with the sucked steam is circulated by the cooling water pump (6d), and equipped with a cooling tower (6b) for lowering the temperature of the heat-exchanged cooling water, the condensed water liquefied in the heat exchanger is drained to the outside and recycled.

The operation and effects of the present invention having the configuration as described above will be described in detail.

The apparatus 1 of the present invention is installed in a facility in which leachate or factory wastewater is generated, and the sludge and scale solidification are discharged by evaporating the concentrated water first treated as a separation membrane to a high temperature, and the vaporized water vapor is converted into condensed water. First, the concentrated water firstly treated is supplied to the concentration chamber 22 of the evaporation tank 20a by a circulation pump 4a to a predetermined level, and the combustion chamber 21 of the evaporation tank 20a is supplied. Burner 10 for providing a heat source is supplied with a combustion gas such as landfill gas or city gas generated in the landfill from the storage tank (9) to ignite it to heat the combustion chamber 21 to a heating temperature of about 800 ℃ The hot exhaust gas is discharged to the outside via the stack 29.

At this time, since the concentrated water supply line 4d for supplying the concentrated water is connected to the concentration chamber 22 through the stack 29, the concentrated water is initially heated by the heat source of the exhaust gas during the supply. The higher temperature can improve the thermal efficiency in the concentration chamber 22. Then, the level of the concentrated water supplied in the concentration chamber 22 is controlled by the level switch 4c to check the highest level (H) and the lowest level (L) from time to time to control the feedback to maintain a stable water surface.

When the heat source of the burner 10 is transferred to the separation plate 23 and the concentration storage tank 20a which vertically divides the combustion chamber 21 and the concentration chamber 22 to heat the concentrated water, the moisture contained in the concentrated water. Is evaporated, and the ions and foreign substances in the concentrated water remain in the sludge state on the bottom surface of the separator 23, so that the level of the concentrated water is gradually lowered. At this time, when the level of the brine reaches the lowest level (L), the control valve (4e) of the brine supply line (4d) is opened by the detection signal of the level switch (4e) detected this to open the brine to the highest ( To H).

Here, the vapor evaporated by the heat source of the burner 10 is forcibly sucked by the vacuum blower (6a) is moved to the heat exchanger (6) through the exhaust pipe (6c), and introduced into the heat exchanger (6) The steam is reduced to a temperature below the dew point through water cooling of the cooling water supplied by the cooling water pump 6d, converted into liquid condensate, and then drained to the outside for recycling.

On the other hand, the sludge solidified by the evaporation of the concentrated water, the recrystallized scale, etc. are attached to the bottom surface of the separation plate 23 and the side of the concentration chamber 22, but these residues are stored in the cylinder members 32a and 32b. It is scraped off and removed by the scraper 31a (31b) reciprocating by the () is discharged to the outside by the screw (33a) 33b.

That is, when the cylinder members 32a and 32b are reciprocated continuously or periodically by pneumatic, hydraulic or mechanical, the lower edge is in contact with the bottom surface of the separation plate 23, and one side edge is the concentration chamber 22. The scraper (31a) (31b) in contact with the inner surface of the reciprocating operation to scrape and remove the sludge and scale, the sludge and the scale is removed scraped conveyor (34a) provided at both ends of the separation plate (23) Drop to 34b).

When an external power source is applied to the motor members 35a and 35b and the screws 33a and 33b installed on the conveyors 34a and 34b are rotated in one direction, they are dropped on the conveyors 34a and 34b. The sludge and the scale of the solid state are conveyed to the discharge openings 36a and 36b formed on the upper ends of the conveyors 34a and 34b by the rotating screws 33a and 33b and are discharged to the outside.

On the other hand, in order to control the strong adhesion scale generated in the concentration chamber 22, the weight of the seed stored in the seed tank 41 is measured as the load cell 43, the measured value is measured controller 44 ), And the opening degree of the rotary valve 45 is controlled by the metering controller 44, so that the same kind of stable seed agent stored in the seed tank 41 (e.g., Calcium seed) may be injected to about 100 to 1000ppm to the concentration chamber 22 through the input pipe (41a). Such a seed acts as a core to prevent the scale of fine crystals from adhering to the facility, and the scale to be attached is also in a soft state to facilitate the scraping operation by the scrapers 31a and 31b.

According to the present invention having the above-described configuration, the sludge remaining in the concentration chamber 22 and the scale to be attached are scraped off as the scrapers 31a and 31b reciprocated by the cylinder members 32a and 32b. Since the heat transfer efficiency of the heat source can be improved, the facility investment cost can be reduced by eliminating the need to install facilities such as a boiler 5 for steam production and a dryer 7 for solidifying sludge. The effect of smoothly treating leachate or plant process water at low cost is obtained.

Claims (4)

In a facility for evaporating concentrated water to a heat source and discharging the remaining sludge in a solid state, A burner 10 providing a heat source; An evaporation concentrating tank 20a provided with a separating plate 23 for partitioning between the combustion chamber 21 to be heated as a heat source of the burner 10 and the concentrating chamber 22 to which concentrated water is supplied is provided, and the combustion chamber 21 is provided in the combustion chamber 21. An evaporation concentrating unit 20 having a stack 29 for discharging exhaust gas to the outside to evaporate the moisture of the concentrated water; And a plurality of cylinder members 32a and 32b for reciprocating a plurality of scrapers 31a and 31b in contact with the bottom surface of the separation plate 23 and the inner surface of the concentration chamber 22. 23 on both sides of the conveyor 23a and 34b to which the scale removed by the scrapers 31a and 31b falls, and the scales are transferred to the outlets 36a and 36b. A removal unit 30 having screws 33a and 33b rotated by the discharge unit to discharge the scale to the outside; And Seed part 41 having a seed tank 41 for storing the seed to be introduced into the concentration chamber 22, and having a metering controller 44 for receiving the measured value of the seed to control the dose of the seed ( 40); comprising a direct evaporation concentrator. The burner according to claim 1, wherein the concentrated water supply line (4d) for supplying the concentrated water into the concentration chamber (22) increases the water temperature during the supply of the concentrated water to improve the thermal efficiency in the concentration chamber (22). (10) A direct evaporation concentrator, characterized in that it is installed to pass through the stack 29, the exhaust gas of high temperature generated during combustion. According to claim 1, wherein the separation plate 23 has a slope lower than the upper end of the discharge port (36a, 36b) is formed, the constant angle (θ) of the slope is dependent on the properties of the concentrated water to be concentrated Direct evaporative condenser characterized in that the design is changed to fit. The weight of the seed stored in the seed tank 41 is measured as a load cell 43, the measured value is transmitted to the weighing controller 44, the rotary by the weighing controller 44 Since the opening degree of the valve 45 is controlled, a predetermined amount of the same seed stored in the seed tank 41 is injected into the concentration chamber 22 through the input pipe 41a according to the properties of the concentrated water. Direct type evaporator.