JPS5832640B2 - Freeze-thaw sludge treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a freeze-thaw type sludge treatment apparatus that improves dewatering performance by freezing and then thawing sludge.

A conventional sludge treatment apparatus of this type is shown in FIG.

In Fig. 1, 1 is a pipe body that has a constant cross section in the pipe axis direction, and consists of a part that freezes and a part that thaws the sludge (not shown) contained therein, and 2, a plurality of pipe bodies. 1, 3a and 3b are first and second chambers formed by the casing 2 around the freezing and thawing sections of the pipe body 1, and 4 is a housing for each chamber 3a, 3b. This is a partition plate for uniformly bringing the flowing cooling medium and heating medium (not shown) into contact with the outer peripheral surface of the tube body 1.

Reference numerals 5 and 6 refer to a mud supply chamber and a mud removal chamber which are open at both ends of the pipe body 1, 7 and 8 a mud supply pipe and a mud discharge pipe that communicate with both chambers 5 and 6, and 9 a mud supply pipe and a mud discharge pipe that are open at both ends of the pipe body 1. A stopper 10 is installed in the side wall of the sludge discharge chamber 6 to prevent movement of frozen sludge, and 10 is a sludge injection pump for supplying raw sludge into the apparatus.

Furthermore, 11 is an evaporator 11a, a condenser 11b, a compressor 1
1c and an expansion valve 11d; 12 is a pipe connecting the first chamber 3a and the evaporator 11a; 13 is a pipe connecting the second chamber 3b and the condenser 11b; 14 is a pipe connecting the second chamber 3b and the condenser 11b; A refrigerant circuit in the refrigeration device 11, 15 a heating medium pipe line used for melting the surface layer of frozen sludge, 16 a pipe line connecting the condenser 3b and a heat exchanger to be described later, and 17 a pipe line in the first chamber 3a. Pipe line for extracting heat medium, 18 is air release pipe line, 19a to 1
9j is an on-off valve provided in each of these pipelines 12, 13, 15-18, 20.21 is a heat medium storage tank, 22-
24 is a pump, 25 is a cooling tower, and 26 is a heat exchanger.

In such a conventional device, when the heat medium is circulated within the system by operating the valves 19a to 19j and the pumps 22.23, the heat medium cooled by the evaporator 11a is
The heat medium flows into the second chamber 3a and freezes the raw sludge in the part surrounded by the first chamber 3a in the tube body 1, and the heat medium heated by the condenser 11b flows into the second chamber 3b. The frozen sludge in the area surrounded by the second chamber 3b in the tube body 1 is thawed.

After freezing and thawing are completed in this way, each of the valves 19
When a to 19j are operated again, the heating medium in the heating medium storage tank 21 will flow to the first chamber 3a, and the surface layer of frozen sludge in the part surrounded by the first chamber 3a in the pipe body 1 will be Melt it into a very thin layer and make it movable.

When raw sludge is supplied from this state by the sludge injection pump 10, the frozen sludge is pushed up inside the tube 1 from the sludge supply side to the sludge discharge side until it is stopped by the stopper 9. When the filling of the raw sludge is completed, the sludge that has been previously thawed in the area surrounded by the second chamber 3b in the pipe body 1 will be discharged to the outside as the frozen sludge moves. .

Thereafter, the above-mentioned operations are repeated by switching the respective valves 19a to 19j again, and the sludge is frozen and thawed.

However, in such a conventional device, when the surface layer of the frozen sludge is partially thawed after freezing and thawing the sludge as described above, the heating medium is made to flow only in a certain direction within the first chamber 3a. Since the pipes are configured and controlled, the melting of the surface layer of frozen sludge becomes uneven in the axial direction of the tube due to differences in the heat medium temperature or heat transfer coefficient in the axial direction of the tube body 1.

Therefore, even if melting progresses more than necessary in a certain part and the gap between the inner surface of the tube body 1 and the outer surface of the frozen sludge becomes large,
Other parts may not even be melted at all, and before the frozen sludge begins to move to the upper side of the pipe body 1, the raw sludge that is press-in is likely to mix into the molten sludge through the above-mentioned gap, and
There is a problem that even after the frozen sludge moves to the upper part of the pipe body 1 and stops at the stopper 9, the raw sludge may be mixed into the molten sludge.

An object of the present invention is to provide a freeze-thaw type sludge treatment apparatus that eliminates the above-mentioned drawbacks by reducing uneven melting of the frozen sludge surface layer.

The present invention will be described in detail below with reference to FIGS. 2 to 4.

Fig. 2 is a schematic configuration diagram showing an embodiment of the freeze-thaw sludge treatment apparatus according to the present invention, and Fig. 3 is a cross-sectional view showing an example of the main parts of the same apparatus from above.
3d is a chamber through which the heating medium flows.

Since the other parts are the same as those in FIG. 1, the same parts are given the same reference numerals and the explanation thereof will be omitted. In the apparatus of this invention, the tube body 1 is installed in a horizontal state.

That is, in this invention, the pipe body 1 is placed horizontally, and the heating medium used for melting the surface layer of frozen sludge is filled into the first chamber 3a while maintaining the liquid level of the heating medium horizontally. 1
Chambers 3c and 3d are provided at both ends of the chamber 3a, and no cooling medium is allowed to flow into these chambers 3c and 3d, but only a heating medium is allowed to flow therein.

In the above-mentioned apparatus of the present invention, by placing the tube body 1 horizontally as shown in FIGS. 2 and 3, and by arranging the partition plate 4 as shown, first, when freezing is completed, the first vessel The cooling medium is extracted from the chamber 3a, and then the heating medium in the heat medium storage tank 21 is filled into the first chamber 3a while maintaining the liquid level horizontally. The unevenness of the temperature and heat transfer coefficient of the heating medium in the axial direction of the tube body 1 is reduced, and the unevenness of melting of the surface layer of frozen sludge is reduced.

Further, chambers 3c and 3d are provided at both ends of the first chamber 3a, and these chambers 3c and 3d remain empty when the cooling medium is flowing into the first chamber 3a, and are frozen. When melting only the surface layer of sludge, a heating medium is flowed.

In this way, it is possible to solve the problem that it takes a long time to melt the surface layer due to poor heat transfer at the edges when the surface layer is melted, and the movement of the frozen sludge becomes smooth.

FIG. 4 is a sectional view showing the main part of another embodiment of the present invention from the side, in which the arrangement of the partition plate 4 is changed in order to increase the heat transfer coefficient during freezing. By attaching the header 27 for melting the surface layer, it is possible to fill the heating medium for melting the surface layer so as to maintain the same liquid level in each chamber partitioned into several by the partition plate 4. As in the example, uneven melting of the surface layer can be reduced.

In FIG. 4, the same parts as in FIG. 3 are given the same reference numerals.

As described above, according to the present invention, the pipe body 1 is placed horizontally and the heating medium for melting the surface layer of frozen sludge is filled while maintaining the liquid level horizontally.
Uneven melting of the surface layer of frozen sludge can be reduced, and mixing of raw sludge into molten sludge can be prevented.

Further, by providing chambers 3c to 93d at both ends of the first chamber 3a, through which only a heating medium is allowed to flow without a cooling medium, there is an effect that the movement of frozen sludge can be made smoother. .

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a schematic configuration diagram of a conventional device, Fig. 2 is a schematic configuration diagram showing an embodiment of the freeze-thaw sludge treatment device according to the present invention, and Fig. 3 is a main part of the same device. FIG. 4 is a cross-sectional view showing an example from above, and FIG. 4 is a cross-sectional view showing main parts of another embodiment of the invention from the side. DESCRIPTION OF SYMBOLS 1... Pipe body, 3a, 3b... 1st and 2nd chamber, 3 c p 3 d... Container chamber, 10... Sludge injection pump, 11... Freezing device, 12, 13.15～
18... Pipes, 19a-19j... Opening/closing valves. In addition, the same reference numerals in the drawings indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. A tube body having a constant pipe cross section in the tube axis direction, first and second chambers provided around the tube body on the inlet side and the outlet side, respectively, and a first chamber. a means for pressurizing raw sludge into a tube surrounded by a first chamber; a means for supplying a cooling medium to a first chamber to freeze the raw sludge in the tube surrounded by the first chamber; Freezer equipped with a medium supply mechanism for supplying a heating medium for melting a layer and for supplying a heating medium for melting frozen sludge that has been moved into a second vessel chamber by pressurizing raw sludge into a tube surrounded by the vessel chamber. In melting sludge treatment equipment,
The pipe body is installed in a horizontal state, and the medium supply mechanism is configured to supply the heating medium used for melting the surface layer of frozen sludge into the first chamber so that the liquid level is horizontal. Freeze-thaw sludge treatment equipment featuring: 2. Claim 1, characterized in that chambers are provided at both ends of the first chamber, the chambers being left empty when the sludge is frozen, and allowing a heating medium to flow through when the surface layer of the frozen sludge is thawing. Freeze-thaw sludge treatment equipment.