JP3833462B2 - Evaporative drying method and evaporative drying equipment - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a process for the continuous steam Hatsuinui燥integrated waste such as sludge highly discharged water content from waste and water treatment equipment generated from the production facilities of various industrial devices.
[0002]
[Prior art]
As a method of treating wastes such as waste liquid and sludge having a high water content, they are treated by using a separate apparatus such as concentrating with various concentrating apparatuses and further drying with a drying apparatus.
[0003]
In the concentrating device in the previous section, since the residual moisture is 70% or more and cannot be discarded as it is, it is further processed in a drying device. For this reason, not only the equipment cost increases, but also there is a problem that a large installation area is required, energy consumption is high and running cost is high.
[0004]
[Problems to be solved by the invention]
In view of the problems described above, the sludge of the waste and high water content discharged from the production equipment and water treatment facilities in succession in a single device to efficiently concentrated Chijimiinui燥, economical and energy saving It aims at proposing the device which did.
[0005]
[Means for solving the plot]
To achieve the above object, in the vapor Hatsuinui燥方method according to the invention of claim 1, comprising the steps of evaporating water by indirect heat exchange effluent and sludge of high water content in the saturated vapor, drying by superheated steam The superheated steam uses only sensible heat in the drying process, and is converted to saturated steam and used as a heat source for the evaporation process. According to this method, the heating tube temperature in the drying process is substantially the same as the superheated steam temperature, the temperature difference between the dried product and the heat transfer surface is increased, and the heat transfer rate is dramatically increased. Further, the steam that has been saturated and vaporized uses latent heat in the evaporation process, and recirculates as saturated water to the boiler to effectively use the exhaust heat.
[0006]
Further, those of invention of claim 2 and an apparatus for carrying out the vapor Hatsuinui燥方method of claim 1, where for integrating this evaporative drying essential evaporation step in the practice of the method the drying step, is configured as a multistage It is. The heating tubes at each stage are annular and a plurality of concentric circles are arranged, and the tubes are finned to form a floor.
[0007]
The invention of claim 3 is an apparatus for carrying out the vapor Hatsuinui燥方method of claim 1, the floor of the drying step will be denoted by the fins on the outer surface center portion of the heat pipe, the upper surface is仂-out as a dry heating surface, The lower surface acts as a steam superheater.
[0008]
The invention of claim 4 is an apparatus for carrying out the vapor Hatsuinui燥方method of claim 1, the combustion furnace is provided in the lower portion of the drying process, by placing a water tube allowed formed boiler heat transfer surface to the combustion chamber Generate saturated steam. The ceiling of the combustion chamber is shared with the floor of the drying process of claim 3. Therefore, the floor of the drying process can act as a heating pipe at the top and a superheated steam pipe at the bottom.
[0009]
The invention of claim 5 is an apparatus for carrying out the vapor Hatsuinui燥方method of claim 1, moisture generated by the steam Hatsuinui燥step (base one par), since many of them have little with odor The vapor is discharged from the upper part of the apparatus and introduced into a combustion furnace for oxidative deodorization. Since the combustion furnace is generally heated to about 1200 ° C., it is effectively oxidized and deodorized.
[0010]
[Action]
According to evaporation Hatsuinui燥方method according to the invention of claim 1, sludge of waste and high moisture content water was evaporated by turned by indirect heating in the evaporation step which is located at the top, the concentration has been lower drying step In the drying process that flows in, superheated steam is used as a heat source for indirect heating, and the object to be dried is heated substantially equal to the superheated steam temperature, so that the heat transfer rate increases dramatically. The steam that has lost sensible heat in the drying process becomes saturated steam, is introduced into the heating pipe of the evaporation process, is discharged as saturated water using latent heat, and is recycled and used as boiler feed water.
[0011]
According to the steam drying apparatus of the second aspect of the invention , the evaporation step and the drying step are arranged up and down, the indirect heating pipes in each step are annular, a plurality of concentric circles are arranged, and “fins” are attached to the pipes. To form each floor. The transfer of the dried product with the tangent touching heat transfer by the heating heat transfer surface and be evaporated dry matter by such a structure can be improved can be smoothed.
[0012]
According to the steam drying apparatus of the third aspect of the invention, the heating tube in the drying process is finned, the upper surface acts as a heating surface of the object to be dried, and the lower surface acts as a steam heating surface heated by the combustion gas. In addition, as a ceiling of the combustion furnace according to the fourth aspect, the hot gas is isolated.
[0013]
According to the vapor drying apparatus according to the invention of claim 4, the combustion furnace at the bottom of the drying step is provided, by disposing water tubes forming the boiler heat transfer surfaces in the combustion chamber, by which the saturated steam vapor Hatsuinui燥It is compact as a vapor Hatsuinui燥apparatus which apparatus because configured to generate the steam are continuously deployed integrally required.
[0014]
According to the vapor drying apparatus according to the invention of claim 5, discharging the base one Parr from the top of the apparatus for oxidizing deodorizing water (base one per) evaporated from the superheated material by evaporation Hatsuinui燥方method of claim 1 It is used to squeeze into a combustion furnace and oxidize with combustion gas to make it non-brominated.
[0015]
【Example】
Figure 1 shows an embodiment of the present invention, showing a longitudinal sectional view of a steam Hatsuinui燥device. In the figure, reference numeral 1 denotes an evaporation process bed, 2 denotes a drying process bed, and 3 denotes a combustion furnace arranged in multiple stages in a cylindrical shape.
[0016]
The indirect heating heat transfer surfaces of the evaporation step 1 and the drying step 2 are annular and arranged in several rows on a concentric circle, and “fins” are welded between the tubes to form a floor. The superheated steam passes through the inside of the tube in the drying step 2, and the material to be dried is in contact with the outside of the tube. Steam that has been saturated and vaporized through the drying process flows in the tube of the evaporation step 1, and a heated object in high moisture is in contact with the outside of the tube.
[0017]
A combustion furnace 3 is installed in the lower part of the drying step 2, and a water tube group 4 is arranged in the interior thereof to form a boiler heat transfer surface.
[0018]
The water pipe group 4 is gathered in the pipes 5 and 6, supplied with water from the pipe 5, generates steam in the water pipe group 4, and is sent to the pipe 7 of the drying process heat transfer pipe through the pipe 6.
[0019]
A heat transfer tube with an annular fin is assembled in the steam inlet pipe 7 of the drying process heat transfer tube, the lower part of the heat transfer tube acts as a superheater tube, and the upper surface acts as a contact heat transfer surface to the object to be dried. Yes.
[0020]
The outlet pipe 8 of the finned heat transfer pipe in the drying process is joined to the inlet pipe 9 of the evaporation process heat transfer pipe, used as a heat source for the evaporation process, and recycled to the boiler as saturated water through the outlet pipe 10.
[0021]
The combustion furnace 3 is equipped with a combustor 11 such as a heavy oil burner.
[0022]
The hot gas generated in the combustor 11 passes through the upper part of the water tube group 4, and circulates the combustion furnace 3 about half way, is turned back into the lower part, exchanges heat to generate steam, and is discharged to the exhaust pipe through the exhaust gas outlet 12.
[0023]
Waste water, sludge, and the like having a high water content are charged by a pump or the like from the inlet 13 at the top of the apparatus. The introduced waste liquid, sludge, etc. flow on the heating pipe on the floor of the evaporation process 1 and transfer to the floor of the drying process 2 while evaporating the water, contact with the heating surface, dried, dried to a predetermined moisture and discharged. It is stored via the outlet 14.
[0024]
The waste water and sludge having a high water content introduced from the introduction port 13 are transferred 360 ° on the floor of the evaporation step 1 and the drying step 2 by an extendable chain 16 attached to the rotary shaft 15 provided in the center of the apparatus. Since the stretchable chains 16 are moved on the respective floors to move the objects to be dried, the objects to be dried are stirred and the floor (heating tube) is cleaned, so that a decrease in thermal efficiency can be prevented.
[0025]
A rotating shaft 15 provided at the center of the apparatus is rotated by a drive device 19 using an electric motor and is of a variable speed type so that the speed can be changed depending on the moisture and dry state of an object to be dried.
[0026]
Incidentally, the device for the upper body to mixing treatment with the hot combustion gases from the base one per inlet 18 provided in the combustion furnace 3 via the base one per outlet 17 for the oxidation deodorization water vapor (base one per) generated by the steam Hatsuinui燥ing.
[0027]
【The invention's effect】
And drying by indirect heating using a further superheated steam and vapor Hatsuinui燥方step of concentrating by evaporation the water by indirect heat waste and sludge according to the method such as waste or sludge according to the invention of claim 1 The system is compact and can be used continuously, so the equipment is compact and heat energy can be used effectively, and both production and running costs are low and can be used stably over a long period of time.・
[0028]
According to the evaporative drying apparatus according to the invention of claim 2 is lower in the drying process is arranged three-dimensional evaporation step for evaporation Hatsuinui燥方method of claim 1 realized efficiently, the bed heat transfer tubes as finned The structure is formed to maintain good contact between the object to be evaporated and the heating surface, and to smoothly move the object to be dried and to prevent the object to be dried from adhering to the heating surface.
[0029]
According to the evaporative drying apparatus of the third aspect of the present invention, the floor of the finned tube forming the drying step has its upper surface in contact with the material to be dried, and its lower surface forms the ceiling of the combustion furnace of the fourth aspect, and the superheated heat transfer surface. In addition, the bed temperature is close to the superheated steam temperature due to the passage of steam even in contact with the high temperature gas in the combustion furnace, and burning can be prevented.
[0030]
As a boiler to generate steam the combustion furnace is provided therein at the bottom of the evaporation drying apparatus according Invite drying process according to the invention of claim 4 arranged water pipes, the evaporated Engineering as Drying process and multistage sequence By doing so, the apparatus is compact and can be integrated and processed continuously.
[0031]
In the evaporating and drying apparatus according to the invention of claim 5, waste liquid, sludge, and the like often emit odor from the evaporated water (normal), so that the vapor is drawn from the upper capital of the apparatus and the high temperature gas in the combustion furnace. Oxidation and deodorization by contact mixing to prevent bad odor pollution.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an example of an evaporation drying apparatus according to the present invention.
FIG. 2 is a plan view of the same.
FIG. 3 is a plan view of the evaporation step.
FIG. 4 is a plan view of the drying step.
FIG. 5 is a plan view of the combustion furnace.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Evaporation process bed 2 Drying process bed 3 Combustion furnace 4 Boiler water pipe group 5 Boiler pipe 6 Boiler pipe 7 Drying process steam inlet pipe 8 Drying process steam outlet pipe 9 Evaporation process steam inlet 10 Evaporation process steam outlet 11 Combustor 12 Exhaust gas outlet 13 Evaporated dry matter inlet 14 Dry matter outlet 15 Rotating shaft 16 Chain 17 Perpar outlet 18 Perpar inlet 19 Driving device

Claims (5)

The process of evaporating moisture by indirect heating of waste liquid or sludge with a high water content by steam and the process of further heating and drying by superheated steam are integrated and used in a continuous process. The superheated steam uses sensible heat for the drying process. and, steam Hatsuinui燥方method comprising the use as a heat source for saturated vapor of the evaporation process. An apparatus for carrying out the vapor Hatsuinui燥方method of claim 1, indirect heating tubes in each of steps in a multi-stage of arranging the drying step the lower part of the evaporation process is more arranged concentrically with the annular, tube finned Evaporative drying equipment that forms a floor. An apparatus for carrying out the vapor Hatsuinui燥方method of claim 1, the floor of the drying step the top surface to the material to be dried against the heating tube drying, lower surface superheated saturated vapor contact with the hot gas as the ceiling of the combustion chamber Evaporative drying device that acts as a superheated steam pipe. An apparatus for carrying out the vapor Hatsuinui燥方method of claim 1, the combustion furnace at the bottom of the drying step is provided, the upper portion of arranged water pipe to the combustion chamber to form a boiler heat transfer surface combustion chamber the drying step Evaporative drying equipment that constitutes the floor of the house. An apparatus for carrying out the vapor Hatsuinui燥方method of claim 1, introduced by oxidizing deodorize discharged該Be one Parr from the top of the device to moisture (the base one per) generated by evaporative drying to a combustion furnace evaporation Hatsuinui Drying device.

Images