Drying device

Abstract

The hot air coming out of the high temperature oxidation deodorization furnace is so hot that if this hot air is introduced directly into the blower, the blower will be damaged. Also, there is a loss when installing the conventional heat exchanger. [Solution] The drying apparatus of the present invention includes a cylindrical drying tank and a high-temperature oxidation deodorization furnace for deodorizing waste steam discharged from the drying tank, the waste steam discharged from the drying tank is introduced into the high-temperature oxidation deodorization furnace, and high-temperature, humid gas discharged from the high-temperature oxidation deodorization furnace is introduced into the drying tank, The system is characterized in that a heat exchanger is provided for exchanging heat between the hot air coming out of the high-temperature oxidation deodorization furnace and the hot air coming out of the drying tank, an inner pipe joining the heat exchanger and the deodorization furnace and an outer pipe joining the heat exchanger and the deodorization furnace are connected to the high-temperature oxidation deodorization furnace, a first outer pipe for introducing the lowered hot air into the blower, and a second inner pipe for introducing the increased hot air into the high-temperature oxidation deodorization furnace are provided.

Description

[Technical field]

[0001] The present invention relates to an apparatus for drying (or carbonizing) waste materials such as factory sludge, dewatered cake, sludge, wastewater, leachate, plating waste liquid, heavy metal waste liquid, slurry, and food waste. [Background technology]

[0002] A drying apparatus has a cylindrical drying tank and a high-temperature oxidation deodorization furnace for deodorizing waste steam discharged from the drying tank, the drying apparatus being characterized in that the waste steam discharged from the drying tank is introduced into the high-temperature oxidation deodorization furnace from above, and high-temperature, humid gas discharged from a lower part of the high-temperature oxidation deodorization furnace is introduced into the drying tank. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-4599 A [Patent Document 2] Patent No. 7135174 Summary of the Invention [Problem to be solved by the invention]

[0004] The hot air coming out of the high temperature oxidation deodorization furnace is so hot that if this hot air is introduced directly into the blower, the blower will be damaged. Also, there is a loss when installing the conventional heat exchanger. [Means for solving the problem]

[0005] The drying apparatus of the present invention includes a cylindrical drying tank and a high-temperature oxidation deodorization furnace for deodorizing waste steam discharged from the drying tank, the waste steam discharged from the drying tank is introduced into the high-temperature oxidation deodorization furnace, and high-temperature, humid gas discharged from the high-temperature oxidation deodorization furnace is introduced into the drying tank, The apparatus is characterized in that it is equipped with a heat exchanger that exchanges heat between the hot air coming out of the high-temperature oxidation deodorization furnace and the hot air coming out of the drying tank, an inner pipe that joins the heat exchanger and the high-temperature oxidation deodorization furnace, and an outer pipe that joins the heat exchanger and the high-temperature oxidation deodorization furnace, and that it is possible to introduce lowered-temperature hot air into a blower and raise-temperature hot air into the high-temperature oxidation deodorization furnace. Effect of the Invention

[0006] According to the drying apparatus of the present invention, the hot air coming out of the high-temperature oxidation deodorization furnace and the hot air coming out of the drying tank are heat exchanged in a heat exchanger, and the lowered temperature hot air is introduced into the blower, and the higher temperature hot air is introduced into the high-temperature oxidation deodorization furnace. This prevents damage to the blower, eliminates loss at the attachment point of the heat exchanger, and provides good thermal efficiency. [Brief description of the drawings]

[0007] [Figure 1] 1A and 1B are schematic diagrams of a drying device of the present invention, in which (a) is a horizontal cross-sectional view and (b) is a vertical cross-sectional view. [Diagram 2] 1A and 1B are schematic diagrams of a drying device in a deodorizing furnace that does not use ceramic radiant tubes, where (a) is a horizontal cross-sectional view and (b) is a vertical cross-sectional view. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] The drying apparatus of the present invention will be specifically described based on examples. The hot air coming out of the high-temperature oxidation deodorization furnace is so hot that if this hot air is introduced directly into the blower, the blower will be damaged. Also, if the waste steam from the drying tank is introduced directly into the high-temperature oxidation deodorization furnace, the thermal efficiency will decrease. Therefore, the following was adopted. Note that the following example shows one embodiment of the drying apparatus of the present invention, and the configuration of the drying apparatus of the present invention is not limited to this.

[0009] FIG. 1 is a schematic diagram showing one embodiment of the drying device of the present invention, where (a) is a horizontal sectional view and (b) is a vertical sectional view.

[0010] The drying apparatus (100) of the present invention is a new system in which a heat exchanger (132) is provided to exchange heat between hot air from the high-temperature oxidation deodorization furnace and hot air from the drying tank, an inner pipe (133) that connects the heat exchanger and the deodorization furnace is connected to the high-temperature oxidation deodorization furnace, an outer pipe (134) that connects the heat exchanger and the deodorization furnace is connected to the high-temperature oxidation deodorization furnace, and a first outer pipe that introduces lowered-temperature hot air to the blower and a second inner pipe that introduces higher-temperature hot air to the high-temperature oxidation deodorization furnace are provided, so that the blower is not damaged and thermal efficiency is good. Also, a ceramic RT (radiant tube) (120) that can withstand high temperatures is used for the wall (heat transfer surface) (120A) of the high-temperature oxidation deodorization furnace (103).

[0011] The drying tank (105) has a cylindrical drying tank (105) and a high-temperature oxidation deodorization furnace (103) for deodorizing waste steam (131) discharged from the drying tank (105). Hot and humid gas discharged from the bottom of the high-temperature oxidation deodorization furnace (103) is introduced into the drying tank (105) via a blower (109). The drying tank (105) has a rotary winding blade (108) that rotates around a rotating shaft (107) by a drive motor (111). The material to be dried is dried by being struck against the wall of the rotary winding blade (108) with centrifugal force. The wall of the high-temperature oxidation deodorization furnace (103) can be used as a heat transfer surface (120A) using ceramic RT (120), and heat is efficiently transferred to the inside of the jacket (106). The material to be dried is dried by being struck against the wall with centrifugal force of the rotary winding blade (108). Furthermore, the pipe (115) for introducing the waste steam (131) discharged from the drying tank (105) into the high-temperature oxidation deodorization furnace (103) is provided between the ceiling of the drying tank (105) and the upper part of the high-temperature oxidation deodorization furnace (103), and the return pipe (104) introduces the hot and humid gas discharged from the lower part of the high-temperature oxidation deodorization furnace (103) into the lower part of the drying tank (105), thereby increasing the drying speed and making it highly efficient. Furthermore, the use of ceramic RT (120) for the heat transfer surface (120A) makes it resistant to high temperatures. Ceramics are used in the parts of the heat exchanger where the structure changes (including the joints). Ceramic radiant tubes will crack if water droplets get on them, so if you want to stop operation temporarily, you should preheat the tubes, and if you want to stop operation completely, you should use fans (109)(110) to make the temperature inside the dryer the same as the outside of the dryer, preventing condensation.

[0012] Furthermore, by making the outer peripheral surface of the sidewall of the deodorizing furnace into uneven fins, it became possible to increase the surface area of ​​the heat transfer surface, and an improvement in thermal efficiency of about 10% was observed. Also, by making the mounting part of the heat exchanger into uneven fins, performance can be improved. By making the heat transfer surface of the drying tank into uneven fins, performance can be improved.

[0013] A new high-temperature oxidation deodorization furnace that uses ceramic radiant tubes enables heat exchange at the joint between the heat exchanger and the new high-thermal efficiency deodorization furnace. This makes the heat exchange of the heat exchanger more efficient, and this deodorization furnace and heat exchanger set has a better heat exchange rate than ever before. The ceramic radiant tubes allow heat to be efficiently transferred to the jacket on the heat transfer surface, so the heat exchanger is used efficiently. This is because when the heat transfer surface of the pot bottom is 3.5 times larger, the evaporation rate increases by 30%. In other words, the hot air entering the heat exchanger uses gas heated on the heat transfer surface, so the heat exchanger is used more efficiently.

[0014] FIG. 2 shows a second embodiment of the high-temperature oxidation deodorization furnace (103) in which ceramic radiant tubes are not used due to their high cost. As is clear from Figure 2, the heat exchanger has been installed in a way that maximizes heat exchange efficiency. Even with this configuration, heat exchange is possible without any problems, and the same effects as those of the first embodiment are obtained. [Explanation of symbols]

[0015] 103 High-temperature oxidation deodorization furnace 104 Return pipe 105... Drying tank 106 ··· Jacket 107 Rotation axis 108 Rotating winding blade 109 ··· Hot air circulation blower 110 Dilution blower 111 Drive motor 115 Piping 120 Ceramic radiant tube 120A ··· RT heat transfer surface 131 Waste steam 132 ... heat exchanger 133 - Internal piping connecting heat exchanger and deodorizing furnace 134 External piping connecting the heat exchanger and the deodorizing furnace

Claims

1. A drying apparatus comprising: a cylindrical drying tank; and a high-temperature oxidation deodorization furnace for deodorizing waste steam discharged from the drying tank, the waste steam discharged from the drying tank being introduced into the high-temperature oxidation deodorization furnace, and a high-temperature, humid gas discharged from the high-temperature oxidation deodorization furnace being introduced into the drying tank, a heat exchanger for exchanging heat between the hot air coming out of the high-temperature oxidation deodorization furnace and the hot air coming out of the drying tank, an inner pipe connecting the heat exchanger and the high-temperature oxidation deodorization furnace, an outer pipe connecting the heat exchanger and the high-temperature oxidation deodorization furnace, and a blower for sending the hot air coming out of the high-temperature oxidation deodorization furnace to the drying tank, wherein the drying apparatus is characterized in that the hot air whose temperature has been reduced can be introduced into the blower and the hot air whose temperature has been increased can be introduced into the high-temperature oxidation deodorization furnace.

2. 2. The drying apparatus according to claim 1, wherein the high-temperature oxidation deodorization furnace has a furnace body made of a ceramic radiant tube and a jacket that houses a prehearth body, and the internal piping is connected to the furnace body.

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