JPS6153524B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for recovering the thermal energy of intermittent steam.

Traditionally, water injection cooling has been used to cool red-hot coke and red-hot slabs coming out of coke ovens, but at that time, high-temperature steam is generated, and this steam is dissipated into the atmosphere, making it difficult to utilize the thermal energy in any way. The current situation is that they are being discarded without being treated.

The reason for this is, for example, in the case of steam generated when extinguishing red-hot coke, conventional fire-extinguishing equipment requires only one box to receive the red-hot coke. Since steam is generated intermittently until the next process, this poses a major obstacle to recovering the thermal energy in the steam and reusing it as continuous power. There is.

The present invention aims to solve the problems of the prior art, and provides an energy recovery method that allows the thermal energy of the steam that is intermittently supplied to be used as continuous power. be.

A feature of the present invention is that the thermal energy of steam generated intermittently from a closed pressure container for pressure extinguishing red-hot coke is stored in a first accumulator having a first heat exchanger that uses water as a heat exchange medium. At the same time, a second heat exchanger connected in series with the first heat exchanger via a second accumulator recovers the thermal energy of the organic medium Rankine cycle system, and the thermal energy stored in the accumulator is recovered as the thermal energy of the organic medium Rankine cycle system. An energy recovery method is characterized in that power is continuously extracted from intermittently supplied steam by supplementary use as heat energy in a Rankine cycle system.

An example in which the present invention is applied to extinguishing red-hot coke will be described below.

In Fig. 1, 1 is a pressure container for pressure extinguishing, 2 is a cyclone for removing dust generated during coke cooling, and 3 is a boiler that uses water gas as fuel supplied from a water gas separation and recovery device 14, which will be described later. , 4 is a first heat exchanger, 5 is an accumulator, 6 is a circulation pump, and 7 is a heat exchanger built into the accumulator 5. 8 is a second heat exchanger;
9 is an accumulator, 10 is an organic medium turbine,
11 is a generator, 12 is a condenser, and 13 is a circulation pump. The organic medium Rankine cycle system R is composed of the second heat exchanger 8, the accumulator 9, the turbine 10, the generator 11, the condenser 12, and the circulation pump 13. There is. 14 is a water gas separation and recovery device, which separates and recovers water gas from heat-recovered steam; for example, the device described in Japanese Patent Application Laid-open No. 73002/1983 is used. 15 is a water treatment device that removes impurities from steam or hot water.
16 is a three-way valve that bypasses steam back into the system when no steam is generated from the fire extinguishing container. Furthermore, V-1, V-2, and V-3 are flow control valves.

In the above process, red-hot coke is first put into a fire-extinguishing container 1 and sealed, and extinguished under pressure by hot water sprayed into the container 1. At this time, high-temperature superheated steam containing a large amount of water gas is generated. Since this superheated steam contains a large amount of dust, the dust is removed by the cyclone 2 and then sent to the first heat exchanger 4. and the heat exchanger 4
As a result, high-temperature thermal energy is stored in the accumulator. In addition, molten salt, water, etc. are used as a heat storage material used in the accumulator 5. Further, the heat exchanger 4 can also be built into the accumulator 5 as in the embodiment shown in FIG. The steam whose heat has been recovered in the first heat exchanger 4 and has become low temperature is transferred to the second heat exchanger 4.
In the heat exchanger 8, the thermal energy is recovered as energy for the organic medium Rankine cycle system R. That is, a low boiling point medium such as Freon is used as the organic medium, and the medium is
Thermal energy of the low-temperature steam is recovered by a heat exchanger 8, stored in an accumulator 9, drives a turbine 10, and further rotates a generator 11 to recover energy as electric power. Thus the second
The steam that has released thermal energy in the heat exchanger 8 is sent to the water gas separation and recovery device 14, where the water gas contained in the steam is separated and recovered.
On the other hand, a portion of the steam becomes drain, and the water treatment device 15 is removed to be used again for fire extinguishing. However, during the coke extinguishing suspension period, the valve 16 is switched to supply water to the boiler 3, where it becomes high-temperature steam. The heat exchanger 4 is fed to the heat exchanger 4 and recycled into the system.

Therefore, according to the present invention, while the steam is being supplied from the steam generation source, the thermal energy of the high temperature steam is stored in the accumulator 5 by the first heat exchanger 4, and the thermal energy of the low temperature steam is stored. directly rotates the turbine in the organic medium Rankine cycle system R, and when the steam supply from the steam generation source is inactive, the thermal energy stored in the accumulator 5 serves as the energy source for the organic medium Rankine cycle system R. Therefore, it is possible to rotate the turbine even if the supply of steam is stopped, and it is possible to continuously extract power.

Furthermore, when steam contains a large amount of water gas, such as when extinguishing red-hot coke, when the steam supply from the steam generation source is idle, the water gas from the water gas separation and recovery equipment is used as fuel to run the boiler. 3, the organic medium Rankine cycle system R can be continuously operated by generating high-temperature steam and recycling it into the system.

As described above, the present invention is capable of continuously and stably recovering power from the thermal energy of intermittently supplied steam.

Furthermore, since the present invention uses a two-stage heat exchanger, heat above a certain temperature is not applied to the medium side of the organic medium Rankine cycle, so that thermal decomposition into the working organic medium can be prevented.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram showing one embodiment of the present invention, Figure 2 is a schematic diagram showing one embodiment of the present invention.
The figure is a schematic diagram showing another embodiment. DESCRIPTION OF SYMBOLS 1... Fire extinguishing container, 3... Boiler, 4... First heat exchanger, 5... Accumulator (heat storage device), 8... Second heat exchanger, 10... Organic medium turbine, 12...
Condenser, 13...Circulation pump, 14...Water gas separation and recovery device, 16...Three-way valve, R...Organic medium Rankine cycle system, V-1, V-2, V-3...
valve.

Claims (1)

[Claims] 1 The thermal energy of steam generated intermittently from a closed pressure container for pressure extinguishing red-hot coke is stored in a first accumulator having a first heat exchanger that uses water as a heat exchange medium, and A second heat exchanger connected in series with the first heat exchanger via a second accumulator recovers thermal energy for the organic medium Rankine cycle system, and the thermal energy stored in the accumulator is used for the Rankine cycle system. An energy recovery method characterized by continuously extracting power from intermittently supplied steam by supplementing it as thermal energy.