JPS6082775A - Method of drying hydrous substance - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an energy-saving method for drying water-containing materials generated in various industrial fields, particularly when a process for drying water-containing materials and a process requiring low temperature and low-humidity air coexist. The present invention relates to a drying method that can be effectively applied to.

Conventionally, drying of water-containing materials generally requires a large amount of fuel such as heavy oil, kerosene, gas, or electricity, and is extremely energy consuming.

In addition, in the treatment of sewage, human waste, and various industrial wastewater, blowers are installed for the purpose of supplying air for biological treatment and aerobic digestion of paid sludge, and low-temperature, low-humidity air is used for various types of cooling. A processor is also installed for use. However, these blowers only perform a single function, which is to simply supply air.

There was no question about this, and there was no technical idea -3- to give these blowers a post-finishing function.

The present invention was completed by focusing on the energy of the blower, which has not been considered at all in the past. In other words, since the blower is an air compressor, as shown in the adiabatic compression theory of gases in thermodynamics, the temperature of the blower discharge air is much higher than the temperature of the intake air, and when the atmospheric temperature is 10 to 20 degrees Celsius, , the temperature of the blower discharge air is 80-1
The present invention was completed by focusing on the fact that the temperature reaches 00°C.

An object of the present invention is to provide an energy-saving drying method that skillfully recovers and effectively utilizes the heat retained in blower discharge air and can dry water-containing materials without requiring any fuel. be.

The present invention uses a blower to suck air in a drying chamber for drying water-containing materials, uses the retained heat of the blower discharge air as a drying heat source in the drying chamber, and transfers the cooled blower discharge air to the refrigerant evaporation section of a heat pump. At the same time, the heat dissipated from the refrigerant condensing section of the heat pump is used as a heat source for drying in the drying chamber, and the heat dissipated from the refrigerant condensing section of the heat pump is used as a heat source for drying. This system is characterized by supplying low-temperature, low-humidity blower discharge air to aeration air in organic wastewater treatment, pressurized air for cooling, and other air utilization processes that require low-temperature, low-humidity air.

An embodiment of the present invention will be described below by taking a sewage treatment facility as an example.

A drying chamber 2 containing dehydrated cake of sewage sludge and other water-containing solids 1 to be dried generated in sewage treatment facilities.
The wall A of the drying room 2 is isolated from the outside air with insulation material.
The air 3 inside is sucked and compressed by the aeration blower 4, but in this process, compression heat is generated, and the temperature of the blower discharge air 5 rises to about 80 to 100°C. In order to recover the heat of this blower discharge air 5, the blower discharge air 5 is caused to flow into a heat exchanger 6 to warm the outside air 7, and the obtained warm air 7'
is introduced into the drying chamber 2 and used as a heat source for drying the water-containing solid material 1.

On the other hand, the blower discharge air, whose temperature has been lowered by heating the outside air 7 by the heat exchanger 6, contains a large amount of water vapor evaporated from the hydrated solid material 1 to be dried. Therefore, the latent heat held by this water vapor is also recovered and used as a heat source for drying. For this purpose, the high-humidity air 5' is cooled by contacting with a refrigerant evaporator 8 such as freon of the heat pump, and the latent heat of condensation is recovered by condensing the water vapor, and the generated condensed water is discharged from the drain 9.

Therefore, the refrigerant condensing section 10 (heat radiation section) of the heat pump
Since the sum of the latent heat of water vapor condensation recovered from the high-humidity air 5' and the amount of heat (1 m = 860 kcal) that is converted to the power input to the refrigerant compressor 11 of the heat pump is dissipated, this heat is also used for drying. Use as a heat source.

Note that 12 indicates a refrigerant expansion valve.

In addition, the low-temperature, low-humidity air 5'' flowing out from the refrigerant evaporation section 8 (cooling and dehumidifying section for high-humidity air 5') of the heat pump still has a high pressure, and the air is diffused in the aeration tank 13 for activated sludge treatment of sewage. 6- It is supplied to the equipment 14 or used for cooling spaces where people are active, such as the administration building 1 work building.

Note that when the low-temperature, low-humidity air 5'' is supplied to the aeration tank 16 for activated sludge treatment of sewage, a special deodorizing process is not required.In other words, although foul-smelling gas is generated when drying a dehydrated cake of sewage sludge, etc. As a result of this dry exhaust gas being supplied to the aeration tank 13 and used for aeration, it is biologically deodorized by the activated sludge microorganisms living in large quantities in the aeration tank 13.
Eliminates the need for deodorizing equipment and operating costs.

Furthermore, other embodiments of the present invention will be described as follows.

(2) If the drying chamber 2 has a sealed structure, the hot air 7' will automatically flow into the drying chamber 2 by the suction force of the blower 4, so there is no need to provide a separate fan.

(2) If the blower 4 is installed in the drying chamber 2, the heat generated from the blower 4 body is dissipated into the drying chamber 2, increasing the amount of heat that can be used for drying.

(2) The refrigerant condensing section 10 of the heat pump may be disposed inside the drying chamber 2, or may directly exchange heat with the warm air 7' heated by the heat exchanger 6.

- The drying chamber 2 can be of either a single drying force type or a continuous drying type.

As described above, one aspect of the present invention is to recover the heat retained in the air discharged from the blower, which conventionally only had a single function of simply supplying air.

This is because it is effectively used for drying water-containing materials.

You can discover very important effects such as:

■ This is because blower compression heat is used to dry water-containing materials that conventionally required fuel, such as heavy oil.

It has a remarkable energy saving effect and eliminates the need for drying fuel.

■ The latent heat of the water evaporated during drying of the water-containing material is recovered and used as a heat source for drying along with the compression heat of the blower, resulting in further energy savings.
) Allows for drying.

■ Low temperature as a result of drying water-containing materials.

Since low-humidity air is automatically obtained, this air can be used for cooling purposes, eliminating the need for energy consumption for air conditioning.

[Brief explanation of drawings]

The drawing is a system explanatory diagram showing an embodiment of the present invention. 1...Water-containing solid matter, 2...Drying room, 3...Air. 4... Prower, 5... Prower discharge air, 5'...
High humidity air, 5''...low temperature, low humidity air, 6...heat exchanger, 7...outside air, 7'...warm air, 8...refrigerant evaporation section, 10...refrigerant condensation section , 11... refrigerant compressor, 13
...Aeration tank. Patent applicant: Patent attorney representing Ebara Infilco Co., Ltd.
Masayuki Takagi, Patent Attorney, Sen 1) Minoru, Patent Attorney, Takashi Maruyama Procedural Amendment November 22, 1988 Commissioner of the Patent Office Kazuo Chikusugi■, Indication of Case 1988 Patent Application No. 190629 Issue 2/ Departure II
') Name Method for drying hydrated material 3, Relationship with the case of the person making the amendment Patent applicant's address (residence) Engineering R (1) ""°) Ebara I""I" Co., Ltd. 4, agent's amendment Original application In the specification, 1. The claims column is corrected as shown in the attached sheet. 2. "Paid sludge" in line 13 of page 2 is corrected to "organic sludge." 3. The first line of page 6 is corrected as follows. "Supplied to equipment 14, used for aeration in the aeration process of organic sludge, administration building, work building, etc." 4. Insert the following sentence after line 12 on page 6. "The blower discharge air used as the drying heat source in the above-mentioned present invention includes the discharge air of an air compressor, etc." 5, page 8, lines 2 to 5 as follows: correct. [■ As a result of drying water-containing materials, low-temperature, low-humidity air that retains pressure is automatically obtained, so this air can be used for aeration of organic sewage and organic sludge and for air conditioning. Power, air conditioning moving cuff′″
``'!'' 1.1 Scope of Claims t Air in a drying chamber for drying water-containing materials is sucked by a blower, and the heat retained in the air discharged from the blower is used as a heat source for drying in the drying chamber to lower its temperature. The blower discharge air is brought into contact with the refrigerant evaporation section of the heat pump to be cooled and dehumidified, and the heat released from the refrigerant condensation section of the heat pump is used as a heat source for drying in the drying chamber, and further flows out from the refrigerant evaporation section of the heat pump. A method for drying a hydrated material characterized by using low temperature, low humidity blower discharge air in an air utilization process. A method for drying a water-containing material according to claim 1. 6. The method for drying a water-containing material according to claim 1 or 2, wherein heat generated by the blower body is dissipated into the drying chamber. 2- or more

Claims (1)

[Claims] 1. The air in the drying chamber for drying the water-containing material is sucked by a blower, the heat retained in the air discharged from the blower is used as a heat source for drying in the drying chamber, and the cooled air discharged from the blower is used as a heat source for drying in the drying chamber. The blower discharges low temperature and low humidity, which is brought into contact with the refrigerant evaporation section of the heat pump for cooling and dehumidification, and utilizes heat radiation from the refrigerant condensation section of the heat pump as a heat source for drying in the drying chamber, and further flows out from the refrigerant evaporation section of the heat pump. A method for drying a water-containing material, characterized in that air is used in an air utilization process. 2. The method for drying a water-containing material according to claim 1, wherein the drying chamber has a closed structure. 3. The method for drying a water-containing material according to claim 1 or 2, wherein the blower is installed in a drying chamber.