JP2010125429A - Apparatus for treating waste liquid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for treating a waste liquid, which allows the efficient concentration of a coolant liquid. <P>SOLUTION: The apparatus for treating a waste liquid includes a storage tank 10 for storing the waste liquid before treatment, a concentrator 20 for concentrating the waste liquid supplied from the storage tank 10 by heating, and a condenser for condensing vapor generated by heating. In the apparatus, the concentrator 20 includes: first and second cylindrical heating sections 21, 22 arranged in parallel with each other, each for heating the waste liquid while allowing the waste liquid to flow upward; and a cylindrical reflux section 23 arranged between and in parallel with the first heating section 21 and the second heating section 22, and having upper and lower ends connected to the upper and lower ends of each of the heating sections, respectively, for allowing the waste liquid to flow downward. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a waste liquid treatment apparatus that concentrates waste liquid transported from a factory to a predetermined treatment facility.

  Conventionally, when machining or polishing a metal processed product or ceramic processed product with a predetermined tool, the processed product or tool is denatured by heating due to cutting or polishing, or static electricity is generated. In order to prevent it from occurring, it is carried out while flowing a lubricating liquid such as a coolant liquid.

  The coolant that has flowed over the workpiece or tool contains cutting or polishing debris, so it is collected and filtered to remove the cutting debris or abrasive debris and reused. By repeating, a certain amount or more of impurities are mixed in the coolant liquid, or deterioration occurs due to decay. The coolant liquid thus deteriorated is incinerated as industrial waste (see, for example, Patent Document 1).

  In the case of incineration, the incineration facility is usually a separate facility from the factory that uses the coolant liquid, so the coolant liquid had to be transported from the factory to the incineration facility.

Therefore, in order to reduce the conveyance cost and the incineration cost by reducing the amount of the coolant liquid to be incinerated as much as possible, it has been studied to concentrate the deteriorated coolant liquid.
JP-A-10-328675

  However, when concentrating the deteriorated coolant liquid, it is necessary to heat the coolant liquid. However, when the coolant liquid is simply heated by placing it in a suitable container, it becomes cottony as the coolant liquid is concentrated. Precipitate flocs are likely to adhere to the inner surface of the container, and not only can maintenance work such as floc removal be extremely complicated, but heating efficiency tends to decrease, making it impossible to concentrate effectively. There was a problem.

  Therefore, the present inventors have made the present invention in the process of developing a waste liquid treatment apparatus capable of efficiently concentrating a coolant liquid.

  The waste liquid treatment apparatus of the present invention includes a storage tank that stores waste liquid before processing, a concentrator that heats and concentrates the waste liquid supplied from the storage tank, and a condenser that condenses the vapor generated by heating. In the waste liquid treatment apparatus, the concentrators are arranged in parallel with each other, and each of the first and second heating units has a cylindrical shape and heats the waste liquid while flowing the waste liquid from the bottom to the top. And a cylindrical recirculation portion that is arranged in parallel with each other and that connects the upper end and the lower end to each other to feed the waste liquid from the top to the bottom.

Furthermore, the waste liquid treatment apparatus of the present invention is also characterized by the following points.
(1) A cylindrical inner tube is coaxially provided on the inside of the circulating portion, and a funnel that is widened upward is provided at the upper end of the inner tube.
(2) One end is connected in communication with the lower position of the heating means provided in the first heating section, and the other end is connected in communication with the lower position of the funnel in the reflux section so as to accumulate outside the inner pipe in the reflux section. A first auxiliary pipe that feeds the waste liquid to the first heating unit, and one end connected to the lower position of the heating means provided in the second heating unit, and the other end to the lower position of the funnel of the reflux section And a second auxiliary pipe that is connected to and connected to the outside of the inner pipe in the circulating section and feeds the waste liquid to the second heating section.
(3) The first heating section and the second heating section are reduced in diameter toward the upper side at the upper positions of the lower first connecting pipe and the lower second connecting pipe connected to the circulating section at the lower end. Each guide piece was provided.
(4) The middle part of the supply pipe for supplying the waste liquid from the storage tank to the concentrator is connected to the condenser and the waste liquid is heated by the condenser.
(5) The condenser uses groundwater to condense steam.
(6) The waste liquid is heated by the thermal energy of solar heat or waste heat in the first heating part and the second heating part.

  In the waste liquid treatment apparatus of the present invention, a storage tank that stores the waste liquid before the treatment, a concentrator that heats and concentrates the waste liquid supplied from the storage tank, and a condenser that condenses the vapor generated with the heating, In the waste liquid treatment apparatus, the concentrators are arranged in parallel with each other, and each of the first and second heating units has a cylindrical shape and heats the waste liquid while flowing the waste liquid from the bottom to the top. Between the heating unit and the circulating unit, by arranging the cylindrical circulating unit that is disposed in parallel with each other and the upper and lower ends are connected to each other and the waste liquid is sent from the top to the bottom. Since the waste liquid can be concentrated while being naturally circulated, the waste liquid can be efficiently concentrated while preventing the occurrence of flock adhesion.

  As shown in FIG. 1, the waste liquid treatment apparatus of the present invention includes a storage tank 10 that stores waste liquid before processing, a concentrator 20 that heats and concentrates the waste liquid supplied from the storage tank 10, and heating. The first condenser 31 that condenses the generated vapor, the second condenser 32, and the multistage condenser 30 that includes the third condenser 33.

  The waste liquid in the storage tank 10 is supplied to the concentrator 20 via a supply pipe 11 having one end connected to the storage tank 10 and the other end connected to the concentrator 20. It is pumped by the feed pump 12 provided in the middle.

  In this embodiment, the waste liquid in the storage tank 10 is pressure-fed to the concentrator 20 by the feed pump 12, but the waste liquid is supplied using the altitude difference by adjusting the arrangement height of the storage tank 10. It may be possible.

  Furthermore, the first condenser 31 of the multistage condenser 30 is interposed in the middle of the supply pipe 11, and the waste liquid in the supply pipe 11 is used as a coolant to cool the steam as will be described later. On the other hand, the waste liquid is preheated.

  The concentrator 20 includes a cylindrical first heating unit 21 and a second heating unit 22 that are arranged in parallel with each other and heat the waste liquid while flowing from the bottom to the top, and the upper end is the upper end of the first heating unit 21. And a cylindrical recirculation portion 23 for connecting the lower end to the lower end of the first heating portion 21 and the lower end of the second heating portion 22 respectively to send waste liquid from the top to the bottom. And are provided.

  In particular, the circulating portion 23 is disposed between the first heating portion 21 and the second heating portion 22 in parallel with each other. In addition, the first heating unit 21, the second heating unit 22, and the reflux unit 23 are provided along the vertical direction, respectively, so that the waste liquid can be smoothly fed, and natural convection is generated in the waste liquid as described later. It is easy.

  In the concentrator 20 of the present embodiment, two heating units, the first heating unit 21 and the second heating unit 22, are provided, but two or more heating units may be provided as necessary. For example, when the third heating unit is provided and the number of heating units is three, each heating unit is arranged at a position that becomes the apex of an equilateral triangle in plan view, and at the center of gravity of the equilateral triangle. It is desirable to arrange the circulating portion 23, and even in such a case, the circulating portion 23 is considered to be disposed between the heating portions in the present invention. That is, each heating unit only needs to be provided at an equal distance from the circulation part 23 in plan view, and if a plurality of heating parts are provided at an equal distance from the circulation part 23, the circulation part 23 is the heating part. Considered to be in between. Here, the equidistance includes the distance from the recirculation part 23 to the heating part farthest away from within twice the distance to the heating part closest to the recirculation part 23. It is desirable that each heating unit be provided as close to the circulating part 23 as possible.

  The first heating unit 21 having a cylindrical shape is provided with a first heat exchanger 21a as a heating means in the middle, and the waste liquid fed to the first heating unit 21 is heated by the first heat exchanger 21a. Yes.

  The first heat exchanger 21a includes a first heat bath 21a-1 in which hot water is stored, and a plurality of first thin tubes 21a-2 that vertically cut through the first heat bath 21a-1, and the first thin tubes The waste liquid fed through 21a-2 can be heated.

  A hot water supply pipe 24 is connected to the upper part of the first heat bath 21a-1 and a drain pipe 25 is connected to the lower part of the first heat bath 21a-1 to supply hot water via the hot water pipe 24. Hot water having a predetermined temperature is supplied from the water heater 26 to the first heat bath 21a-1, while hot water whose temperature has decreased in the first heat bath 21a-1 is returned to the water heater 26 through the drain pipe 25. Yes.

  Although an appropriate heating means can be used for the hot water heater 26, in this embodiment, hot water is generated using the heat energy of the waste heat of the factory that uses the coolant liquid that is the source of the waste liquid. Yes. Alternatively, solar heat may be used. Thus, by producing hot water using thermal energy such as solar heat and waste heat, energy can be saved, and operating costs can be reduced.

  The first heating unit 21 has a cylindrical lower first connection pipe 21b connected to the lower end thereof, and is connected to the lower end of the circulating portion 23 through the lower first connection pipe 21b.

  Further, the first heating unit 21 is provided with a first guide piece 21c having a reduced diameter toward the upper position above the lower first connecting pipe 21b. In particular, the first guide piece 21c is provided below the first inlet 21d, which is a connection portion with the feed pipe 11 in the first heating unit 21, and the concentrated waste liquid is subjected to the first heating as described later. While suppressing the flow into the part 21, the backflow of the waste liquid is prevented. The first inlet 21d is provided at a position below the first heat exchanger 21a.

  The first heating unit 21 is connected to the upper end of the cylindrical upper first connecting pipe 21e at the upper end, and is connected to the upper end of the circulating portion 23 via the upper first connecting pipe 21e. The waste liquid heated by the exchanger 21a can be supplied to the circulating portion 23. In particular, the upper first connecting pipe 21e has a quarter arc shape.

  The cylindrical second heating unit 22 has the same configuration as the first heating unit 21, and is provided with a second heat exchanger 22 a as a heating means in the middle part, and the waste liquid fed to the second heating unit 22 is supplied. Heating.

  The second heat exchanger 22a is also composed of a second heat bath 22a-1 in which hot water is stored and a plurality of second thin tubes 22a-2 that vertically cut through the second heat bath 22a-1, and the second thin tube The waste liquid fed in 22a-2 can be heated.

  A hot water supply pipe 24 is also connected to the upper part of the second heat bath 22a-1 and a drain pipe 25 is also connected to the lower part of the second heat bath 22a-1 to supply hot water via the hot water pipe 24. Hot water having a predetermined temperature is supplied from the water heater 26 to the first heat bath 21a-1, while hot water whose temperature has decreased in the first heat bath 21a-1 is returned to the water heater 26 through the drain pipe 25. Yes.

  The second heating unit 22 is also connected to the lower end portion of the circulating portion 23 through the lower second connection tube 22b.

  Further, the second heating section 22 is also provided with a second guide piece 22c having a reduced diameter upward at a position above the lower second connecting pipe 22b. In particular, the second guide piece 22c is also provided below the second inlet 22d, which is a connection portion with the feed pipe 11 in the second heating unit 22, so that the concentrated waste liquid is contained in the second heating unit 22. While suppressing inflow, the backflow of waste liquid is prevented. The second inlet 22d is also provided at a position below the second heat exchanger 22a.

  The second heating unit 22 is also connected to the upper end of the circulating portion 23 through the upper second connection pipe 22e by connecting the upper upper connection pipe 22e to the upper end. The waste liquid heated by the heat exchanger 22a can be supplied to the circulating portion 23. In particular, the upper second connecting pipe 22e is also formed in a quarter arc shape.

  A cylindrical inner tube 23a is coaxially provided on the inner side of the middle portion of the circulating portion 23 having a cylindrical shape. In the circulation part 23, the double pipe part provided with the inner pipe 23a has a larger diameter than the single pipe part located above the double pipe part, and the inner diameter dimension of the single pipe part is The inner diameter of the inner tube 23a is larger.

  Furthermore, an upper funnel 23b that is widened upward is provided at the upper end of the inner tube 23a. In this way, the circulating portion 23 is provided with the inner tube 23a having an inner diameter smaller than the inner diameter of the single tube portion, and the upper funnel 23b is provided at the upper end of the inner tube 23a. The waste liquid that is concentrated by being heated by the two heating units 22 and increases in specific gravity and settles can be smoothly guided to the inside of the inner tube 23a. Therefore, it is possible to easily cause a downward flow of the waste liquid inside the inner pipe 23a, and it can be used as a driving force for promoting the circulation of the waste liquid.

  The waste liquid that has settled in the inner pipe 23a stays below the circulating portion 23. A concentrated waste liquid tank 28 is provided at a position directly below the recirculation part 23 via an on-off valve 27, and the waste liquid retained below the recirculation part 23 by opening the on-off valve 27 is transferred to the concentrated waste liquid tank 28. It can be discharged.

  Of the waste liquid settled in the inner pipe 23a, the waste liquid separated from the fine particles contained in the waste liquid during sedimentation has a reduced specific gravity due to the separation from the fine particles, and the lower first connecting pipe 21b or the lower first It will circulate to the 1st heating part 21 or the 2nd heating part 22 via 2 connecting pipes 22b.

  Alternatively, the waste liquid whose specific gravity is reduced by being separated from the fine particles rises in the circulating portion 23 and further rises through the outside of the inner tube 23a.

  At the lower end of the inner tube 23a, a lower funnel 23c that is expanded downward is provided, and this lower funnel 23c prevents the concentrated waste liquid from flowing into the outer side of the inner tube 23a. .

  The waste liquid that has risen and accumulated through the outside of the inner pipe 23a is connected to one end of the first heat exchanger 21a provided in the first heating unit 21 at a lower position, and the other end is connected to the upper funnel of the circulation unit 23. It is made to circulate by feeding to the 1st heating part 21 via the 1st auxiliary pipe 23d connected to the lower position of 23b. Further, a second auxiliary pipe 23e having one end connected in communication with the lower position of the second heat exchanger 22a provided in the second heating section 22 and the other end connected in communication with the lower position of the upper funnel 23b of the circulating section 23. It is made to circulate by feeding to the 2nd heating part 22 via.

  As described above, the first auxiliary pipe 23d and the second auxiliary pipe 23e are provided, and the waste liquid that is not sufficiently concentrated is recirculated to the first heating part 21 and the second heating part 22, thereby improving the concentration efficiency of the waste liquid. be able to. Here, the inner pipe 23a not only functions as a guide for the waste liquid that settles due to the increased specific gravity, but also separates the unconcentrated waste liquid in the settled waste liquid from the concentrated waste liquid and circulates it. It also functions as a separating means.

  A cylindrical steam chamber 29 extending upward is provided at a position above the circulating portion 23.

  In the concentrator 20, as shown in FIG. 1, the height of the liquid level L of the waste liquid is a height in the middle of the upper first connecting pipe 21 e and the upper second connecting pipe 22 e that are formed in a quarter arc shape. As described above, the angle between the inner peripheral surface of the upper first connecting pipe 21e and the upper second connecting pipe 22e and the liquid level L of the waste liquid is made smaller than 90 °.

  By doing so, the area of the liquid surface L can be increased, so that the evaporation of the waste liquid can be facilitated, the evaporation efficiency can be improved, and the upper first connecting pipe 21e and the upper second Since the attachment of flocs to the inner peripheral surface of the connecting tube 22e can be suppressed, maintenance can be facilitated. In particular, since the waste liquid that evaporates is boiling, even if floc adheres to the inner peripheral surface of the upper first connecting pipe 21e or the upper second connecting pipe 22e, the floc is washed away due to the liquid level fluctuation of the waste liquid accompanying the boiling. As a result, adhesion of flocs can be suppressed.

  One end of the steam pipe 40 is connected to the steam chamber 29 and the other end of the steam pipe 40 is connected to the first condenser 31 so that the steam in the steam chamber 29 is first connected to the steam chamber 29 via the steam pipe 40. It is sent to the condenser 31.

  As described above, in the first condenser 31, the waste liquid is used as a cooling medium to cool the steam, and not only the steam is simply cooled, but also the latent heat of the steam is recovered in the waste liquid to improve the thermal efficiency. .

  In the first condenser 31, steam may be generated from the waste liquid of the cooling medium as the latent heat is absorbed. The steam generated in the first condenser 31 is a spare pipe 41 having one end connected to the steam pipe 40. The steam pipe 40 is exhausted through

  The steam that has passed through the first condenser 31 is sent to the second condenser 32, where the steam is condensed in the second condenser 32, and the steam that has passed through the second condenser 32 is sent to the third condenser 33. Air is supplied and the vapor is condensed in the third condenser 33.

  In the second condenser 32 and the third condenser 33, groundwater is used as a cooling medium for condensing steam, and groundwater is supplied by a water supply 34. By using groundwater, the cooling medium can be obtained at a low cost, so that the operating cost of the waste liquid treatment apparatus can be reduced.

  Moreover, in this embodiment, the ground water heated when it condensed with the vapor | steam sent to the 2nd condenser 32 or the 3rd condenser 33 is utilized as the water for hot water supply in a factory, or a heat source. .

  The condensed liquid produced by condensing from the vapor in the second condenser 32 and the third condenser 33 is stored in the condensate tank 35. The condensed liquid stored in the condensed liquid tank 35 can be reused as a coolant liquid by adjusting the composition.

  In the present embodiment, the multistage condenser 30 including the first condenser 31, the second condenser 32, and the third condenser 33 is used to condense the vapor generated in the concentrator 20, but one You may comprise with a condenser and it does not necessarily need to be multistage.

  In the waste liquid treatment apparatus configured as described above, since the waste liquid can be concentrated while being naturally circulated by the concentrator 20, the waste liquid can be efficiently concentrated while preventing the occurrence of flock adhesion.

  In addition, solar heat and factory waste heat are used as the heat energy for heating, and groundwater is used as the heat energy for cooling. Can be a waste liquid treatment apparatus with very little.

It is a schematic explanatory drawing of the waste liquid processing apparatus which concerns on embodiment of this invention.

Explanation of symbols

10 Storage tank
11 Supply piping
12 Feeding pump
20 Concentrator
21 First heating section
21a First heat exchanger
21b Lower first connecting pipe
21c First guide piece
21d 1st inlet
21e Upper first connecting pipe
22 Second heating section
22a Second heat exchanger
22b Lower second connecting pipe
22c Second guide piece
22d 2nd inlet
22e Upper second connecting pipe
23 Circulation section
23a Inner pipe
23b upper funnel
23c Lower funnel
24 Hot water supply pipe
25 Drain pipe
26 Water heater
27 On-off valve
28 Concentrated waste liquid tank
29 Steam chamber
30 Multistage condenser
31 First condenser
32 Second condenser
33 Third condenser
34 Water supply
35 Condensate tank
40 Steam piping
41 Preliminary piping

Claims (7)

A storage tank for storing waste liquid before treatment;
A concentrator for heating and concentrating the waste liquid fed from the storage tank;
In a waste liquid treatment apparatus having a condenser for condensing steam generated with heating,
The concentrator
Cylindrical first and second heating units that are arranged in parallel with each other and heated while feeding the waste liquid from below to above,
A waste liquid treatment comprising: a cylindrical recirculation part that is arranged in parallel between the first heating part and the second heating part and has an upper end and a lower end connected to each other to feed the waste liquid from above to below. apparatus.   The waste liquid treatment apparatus according to claim 1, wherein a cylindrical inner pipe is coaxially provided inside the circulating portion, and a funnel that is widened upward is provided at an upper end of the inner pipe. One end is connected in communication with a lower position of the heating means provided in the first heating unit, and the other end is connected in communication with a lower position of the funnel in the reflux portion, so that the outer portion of the inner pipe in the reflux portion is connected. A first auxiliary pipe for feeding the waste liquid collected in the first heating section;
One end is connected to a lower position of the heating means provided in the second heating section, and the other end is connected to a lower position of the funnel of the circulation section so as to be outside the inner pipe in the circulation section. The waste liquid processing apparatus according to claim 2, further comprising a second auxiliary pipe that feeds the waste liquid accumulated in the second heating unit.   The first heating part and the second heating part have a reduced diameter toward the upper side at the upper positions of the lower first connecting pipe and the lower second connecting pipe that are connected to the circulating part at the lower end. The waste liquid treatment apparatus according to claim 3, wherein guide pieces are provided.   5. The waste liquid is heated by the condenser, wherein a middle portion of a supply pipe for feeding the waste liquid from the storage tank to the concentrator is connected in communication with the condenser. The waste liquid treatment apparatus according to item 1.   The waste liquid treatment apparatus according to claim 5, wherein the condenser condenses steam using groundwater.   The waste liquid treatment apparatus according to any one of claims 1 to 6, wherein the first heating unit and the second heating unit heat the waste liquid by thermal energy of solar heat or waste heat.

Images