JPS6130060Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for recovering heat from a high temperature solid using a molten salt.

A general description of a conventional method for recovering heat from a high-temperature solid using molten salt will be given with reference to FIG.

The high-temperature solid 1 is immersed in a molten salt tank 3, and after heat is transferred to the lower-temperature molten salt 2, it is pulled out and placed in a washing water tank 5.
The adhering molten salt is washed off with washing water from the feed line 10, and the cooled solid 6 is sent to the next process. An evaporation pipe 7 is provided in the molten salt 2 in the tank 3, and the steam is separated in a steam drum 9 and sent to a consumer through a line 8. The evaporation pipe 7 is provided above the molten salt tank 3, and the molten salt 2 is naturally circulated, or a forced circulation device is provided so that the high temperature molten salt 2 and the evaporation pipe 7 come into contact with each other.

Here, focusing on the method for recovering the molten salt 2, conventionally the washing water 11 containing the molten salt is collected through the line 4.
The molten salt was sent little by little to the molten salt tank 3, and the water was evaporated in the tank to recover the molten salt. With this method, a large amount of washing water 11 cannot be sent to the molten salt tank 3, so
The salt concentration in the cleaning water tank 5 gradually increases and the cleaning effect decreases. Alternatively, when the salt concentration reaches a certain level, all of the washing water in the washing tank is drained and sent to another molten salt recovery device for treatment and recovery.

This invention solves the above-mentioned problems when recovering molten salt by transferring the washing water drained from the washing water tank to a vacuum concentrator (or a vacuum crystallizer that extracts it as completely dried microcrystal grains). The concentrated washing water (or precipitated salt) is returned to the molten salt tank and reused.It is used as a molten salt tank for heat recovery from high-temperature solids, and a washing water tank for washing molten salt adhered to solids. and a heat recovery device from high-temperature solids, which comprises a vacuum vessel connected to a washing water tank via a washing water extraction pipe and a molten salt tank via a concentrated washing water or precipitated molten salt extraction pipe. be.

The device of the present invention can be effectively applied to a steel plate heat treatment device using molten salt, a heat recovery device from a steel plate, and a heat recovery device from a wire rod.

The device of the present invention will be specifically explained using FIGS. 2 and 3.

A washing water drain pipe 4 is provided at the bottom of the washing water tank 5. The cleaning water 11 is pumped to the vacuum container 12 by the pump 17 or by the pressure difference between the cleaning water tank and the vacuum container without using a pump, and is sprayed and atomized within the container. When recovering the washing water as a concentrated liquid, as shown in Fig. 2, a filling layer 13 is provided in the container to increase the concentration efficiency, and a drain pipe 14 is provided at the bottom of the vacuum container.
will be established. The concentrated washing water is continuously or intermittently returned to the molten salt tank from the drain pipe 14. When recovering as dry salt, as shown in Figure 3,
A heater 19 is provided in the cleaning water outlet pipe 4, and a dry salt outlet pipe 18 is provided at the bottom of the vacuum container 12. Gas in the vacuum container 12 is extracted by a vacuum pump 16 via a mist separator 15. The other structure is the same as that in FIG.

By sending the cleaning water 11 drawn out from the cleaning water tank 5 into the vacuum container 12, vacuum evaporation of the cleaning water immediately occurs within the container. At this time, if the cleaning water is sprayed inside the container, the specific surface area of the water can be increased, and therefore the amount of evaporation can be significantly increased. The water as a solvent in the washing water sprayed into the container evaporates and is taken out either as a concentrated liquid or saturated liquid as shown in Figure 2, or as precipitated crystal grains as shown in Figure 3. be able to.

By using the device of the present invention, the following effects can be achieved.

1. Washing water can be continuously drawn out from the washing water tank and the same amount of washing water (pure water) can be replenished, increasing washing efficiency.

2. Molten salt concentrated or crystallized in a vacuum concentrator or vacuum crystallizer can be immediately reused by returning it to the molten salt tank.

[Brief explanation of drawings]

The attached drawings are schematic diagrams showing the outline of a heat recovery device from high-temperature solids.
Figure 3 shows the present invention. In the figure, 3 is a molten salt tank, 5 is a washing water tank, 12 is a vacuum container, 4 is a washing water extraction pipe, 14 is a concentrated washing water extraction pipe, 1
8 is a precipitated molten salt extraction pipe.

Claims (1)

[Scope of utility model registration request] It is connected to a molten salt tank for heat recovery from high-temperature solids, a washing water tank for washing molten salt attached to solids, and a washing water tank via a washing water extraction pipe, and is also connected to a washing water tank for removing concentrated washing water or precipitated molten salt via a extraction pipe. A device for recovering heat from high temperature solids, consisting of a vacuum vessel connected to a salt bath.