JPH0146688B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a medium purification device for a low boiling point medium power generation plant. In particular, it relates to an intermediate heat medium purification device in a plant where a low boiling point medium is mixed with an intermediate heat medium in an evaporator and evaporated, and a turbine is rotated by the low boiling point medium vapor to generate electricity. The present invention relates to an intermediate heat medium purification device for a low boiling point medium power generation plant, which has a purification system that can be operated without being affected by the operating state of the system.

[Background of the Invention] FIGS. 1 and 2 show a low boiling point medium power generation plant equipped with a conventional purification device.

The main components are a distiller 1, a turbine 2, a generator 3, a condenser 4, a feed pump 5, a preheater 6, a pressure reducing valve 7, a filter 8, an adsorption tower 9, a tank 10, and a transfer pump 11.

This plant recovers heat from a heat source fluid 18 to an intermediate heat medium 12 in a distiller 1, thereby generating low boiling point medium steam as a working medium, which rotates a turbine 2 and drives a generator 3. After power generation, a main system is provided in which the steam is liquefied in a condenser 4 and the liquid is supplied to a preheater 6 and an evaporator 1 by a liquid supply pump 5. Furthermore, this plant utilizes the pressure difference between the evaporator 1 and the tank 10 to introduce the intermediate heat medium 12 in the evaporator 1 into the filter 8 and the adsorption tower 15 for purification, and recovers it in the tank 10. When the collected amount reaches a specified amount, the transfer pump 11 is activated to return the collected water to the evaporator 1.

In the intermediate heat medium purification system in such a conventional low boiling point medium power generation plant, the temperature and pressure of the evaporator 1 directly act on it, and therefore the pressure reducing valve 7
Thereafter, since the low boiling point medium accompanying the intermediate heat medium flashes, the tank 10, vent pipe 13, and condenser 4
There is a problem that the load increases and it is difficult to secure the purification processing amount. Moreover, in this case, the amount of the low boiling point medium accompanying the intermediate heat medium is as large as 50 to 80% by weight, which makes this problem even more disadvantageous.

In addition, the adsorption tower 9 uses activated Shiraki as an adsorbent, but this is because the temperature of the intermediate heat medium is high, and the adsorption performance is significantly reduced, so that the intermediate heat medium cannot be purified sufficiently. However, the shortcoming was that the life of the intermediate heat medium was short.

Furthermore, in this prior art, when exchanging the intermediate heat medium, the operation of the evaporator 1 is temporarily stopped, and the intermediate heat medium 12 is replaced.
The new intermediate heat medium 12 and the low boiling point medium are collected in the tank 10 and extracted outside the plant.
Since the evaporator must be filled with water, stirred and mixed, and then transferred to the evaporator 1 by the transfer pump 11, there were drawbacks such as the need to stop the evaporator for a long period of time.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an intermediate heat medium purification device that can purify an intermediate heat medium regardless of the operating state of a power generation plant and can perform the purification efficiently. For example, by making it possible to intermittently stop the operation of the evaporator and replace the entire amount of intermediate heat medium in the evaporator with a purified medium at an appropriate time, the life of the intermediate heat medium can be extended. As well as extending
It is an object of the present invention to provide an intermediate heat medium purification device that can be configured to effectively remove fine impurities, dissolved substances, and polymerized substances in the intermediate medium under suitable conditions unaffected by evaporator pressure and temperature. I'm aiming for it.

[Summary of the invention]

In order to achieve the above object, the present invention provides a low boiling point medium power generation plant in which a low boiling point medium is mixed with an intermediate heat medium in an evaporator and evaporated, and the low boiling point medium vapor rotates a turbine to drive a generator. A purification system for an intermediate heat medium is provided with a purification system that can purify the intermediate heat medium regardless of the operating state of the plant, and the purification system includes a heater that heats the intermediate heat medium to be purified, and a heater that heats the intermediate heat medium to be purified. It is configured to include at least an adsorption section that purifies the heated intermediate heat medium.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described based on FIG. 3.

The heat medium purification device according to this example is a low boiling point medium power generation plant in which a low boiling point medium is mixed with an intermediate heat medium 12 in an evaporator 1 and evaporated, and the low boiling point medium vapor rotates a turbine to drive a generator. It is used in This purification device is equipped with a purification system that can purify the intermediate heat medium regardless of the operating state of the plant, in addition to a normally installed purification system that purifies the intermediate heat medium during plant operation. Such a purification system includes a heater 2 that heats the intermediate heat medium to be purified.
4, a separation device that separates a low boiling point medium from an intermediate heat medium, and an adsorption section (adsorption removal device) 19 that purifies the heated intermediate heat medium by chemical adsorption.

More specifically, in this embodiment, the purification system other than the normal purification system is of a separate type, and this purification system has the A storage tank 15 as its main component.
A, B storage tank 15B, oil purification pump 16, warmer 2
4, an adsorption removal device 19, a contaminant removal device 17, a post-furnace filter 30, and valves for switching each device.

Based on this configuration, the entire exchange amount of intermediate heat medium is prepared in advance in the A storage tank 15A of this separate purification system, and the intermediate heat medium that has deteriorated within the purification processing limit is transferred from the evaporator 1 to the tank 10. After sequentially collecting the water in the B storage tank 15B of this purification system, the A storage tank 1
The purified intermediate heat medium in 5A is transferred to the evaporator 1. This allows the evaporator 1
A clean intermediate heat medium is provided to enable normal plant operation using this, while the degraded intermediate heat medium recovered in the B storage tank 15B is removed by an adsorption removal device in this separate purification system. 19. The contaminant removal device 17 allows purification to be performed regardless of the operating state of the evaporator 1. The treated clean intermediate heat medium purified in this system is stored in the A storage tank 15A in preparation for the next exchange with the degraded intermediate heat medium.

To explain the above purification procedure in more detail,
It is as follows.

First, the entire exchange amount of purified or new intermediate heat medium is prepared in advance in the storage tank 15A. Next, the degraded intermediate heat medium of the evaporator 1 is guided to the purification system according to the following procedure. The intermediate heat medium 12 held in the evaporator 1 is transferred to a pressure reducing valve 7, a filter 8, and an adsorption tower 9.
The entire amount is extracted into the tank 10 through the path shown by the arrow in the figure. The intermediate heat medium in the tank 10 is transferred to the transfer pump 11 by closing the return valve 26 and inlet gate valve 14.
A transfer to the B storage tank 15B. The route at that time is indicated by an arrow. Since the evaporator 1 is empty in this state, a clean intermediate heat medium is sent to the evaporator 1 in preparation for restarting the power plant operation. That is, the purified or new heat medium held in the A storage tank 15A is sent to the tank 10 via the A storage tank gate valve 27A by opening the A storage tank gate valve 27A and the outlet gate valve 14B by the purifying oil pump 16. This path is indicated by an arrow. At this time, close the warmer inlet valve 20, close the bypass valve 34, and close the bypass valve 34 to prevent the flow from flowing into other paths.
The adsorption removal device bypass valve 29 is closed and the adsorption removal device inlet valve 25 is closed. The purified or new heat medium sent to the tank 10 is transferred by the transfer pump 11 to close the inlet gate valve 14A and close the return valve 26.
In the open state, the intermediate heat medium is filled into the evaporator 1, and the evaporator 1 resumes operation.

Next, we will discuss purification in the purification system. B
The degraded intermediate heat medium transferred to the storage tank 15B is
Usually 50-80% by weight of low boiling medium is included.
However, when such a low boiling point medium is accompanied, the performance of removing dissolved substances and polymers in the adsorption removal device 19 is inhibited, and the performance of removing impurities in the contaminant removal device 17 is inhibited. Therefore, it is necessary to reduce the accompanying low boiling point medium.
In order to reduce this low boiling point medium, heating is performed using a heater 24. That is, the degraded intermediate heat medium in the B storage tank 15B is transferred to the B storage tank as shown by the arrow by opening the B storage tank outlet valve 27B, operating the purifying oil pump 16, opening the warmer inlet valve 20, and opening the warmer outlet valve 21. Storage tank 1
5B and the warmer 24. For this circulation, warmer bypass valve 2 connected to other paths
2 closed, bypass valve 34 closed, adsorption removal device bypass valve 29 closed, adsorption removal device inlet valve 25 closed, and outlet gate valve 14B closed. Due to this circulation, the intermediate heat medium is heated in the warmer 24 by the heating steam 23 (which has a temperature of, for example, 100° C.). The heated intermediate heat medium is sprayed into the B storage tank 15B through the spray pipe 35 in the B storage tank 15B. As a result, the low boiling point medium contained in the intermediate heat medium is vaporized and flows through the vent pipe 13 to the condenser 4 . This series of circulation reduces the low boiling point medium of the intermediate heat medium. For example, reduce it to 20% or less. Next, in order to remove impurities in the degraded intermediate heat medium, the B storage tank outlet valve 27B is opened, the oil purifying pump 16 is operated, the warmer inlet valve 20 is closed, the bypass valve 34 is closed, and the outlet gate valve 14B is closed. , the adsorption removal device inlet valve 25 is closed, the adsorption removal device bypass valve 29 is open, leading to the impurity removal device 17, and the post-filter inlet valve 31 is closed, and the post-filter bypass valve 28 is open.
By opening the storage tank inlet valve 37, the B storage tank 1 is opened as shown by the arrow.
5B and the contaminant removal device 17 are circulated. After the impurities have been removed from the degraded intermediate heat medium in this way, the intermediate heat medium is passed through an adsorption removal device 19 containing an adsorbent in order to remove dissolved substances and polymers from the intermediate heat medium.

In this case, in order to improve the adsorption performance of the adsorbent, it is necessary to heat the intermediate heat medium to increase the chemical adsorption reaction rate. For this heating, it is sufficient to provide an appropriate heating device upstream of the adsorption removal device 19, but in this example, the heating device 2
4 is also used for this heating. That is, by opening the B storage tank outlet valve 27B and opening the heating inlet valve 20, the purifying oil pump 16 is operated, and the intermediate heat medium is heated by the heating steam 23 in the warmer 24 (for example, 80 ° C.
). Warmer outlet valve 21 closed, bypass valve 34
Closed, the adsorption removal device bypass valve 29 is closed, the outlet gate valve 14B is closed, and the adsorption removal device inlet valve 25 is open, and the intermediate heat medium is passed through the path passing through the warmer 24 and the adsorption removal device 19 as shown by the arrow. Dissolved matter and polymerized matter are removed by an adsorbent through an adsorption removal device 19. If the adsorption performance is increased by heating in this manner, it is possible to sufficiently remove dissolved substances and polymerized substances with one pass (one-through) as in a normal adsorption section.

An adsorbent is then used to remove the effluent particles.
By closing the postfilter bypass valve 28 and opening the postfilter inlet valve 31, the contaminant removal device 17 and the postfilter 30 are allowed to pass. The contaminant removal device 17 mainly performs electrostatic purification, and the postfilter 30 performs mechanical filtration. Also, B storage tank inlet valve 37 is closed, A
By opening the storage tank 36, the cleaned intermediate heat medium flows as shown by the arrow and is held in the A storage tank 15A. In this case, if the cleanliness of the intermediate heat medium in the A storage tank 15A is insufficient, the cleaning pump 16 is operated, and the A storage tank outlet valve 27 is opened, the bypass valve 34 is opened, and the storage tank inlet valve 13 is opened. The intermediate heat medium is stored in B storage tank 1.
5B, and again subjected to the above-described adsorption and removal treatment of dissolved substances and polymers.

In addition, the purification system of this example can freely combine the storage tanks 15A, 15B, the warmer 24, the impurity removal device 17, and the adsorption removal device 19 for removing dissolved substances and polymerized substances by the configuration of the valves and piping. It has become possible to change. For example, by switching the valves 29, 34 and the valve 28, some work can be omitted.

As a modification of the above, an electric heater or other heat source may be used instead of the heating steam 23 as the heating source of the warmer 24. Furthermore, it goes without saying that the present invention is not limited to the illustrated example, and other appropriate modifications can be made.

As mentioned above, in this embodiment, by providing a purification system separate from the plant operation system, the intermediate heat medium can be purified regardless of the operation of the plant such as the evaporator and without being affected by the plant. There is an effect that can be done.

Further, in this embodiment, since the intermediate heat medium to be sent to the adsorption/removal device 19 can be heated in advance by the warmer 24, the adsorption/removal performance is large and the efficiency is high.

Furthermore, as a special effect of the specific aspect of this embodiment, by separately providing the B storage tank for degraded intermediate heat medium and the A storage tank for clean intermediate heat medium, it is possible to obtain an effect that the clean intermediate heat medium is not contaminated. can. Moreover, it is easy to remove low boiling points entrained in the intermediate heat medium by heating, and this heating can also be used as a heater 24 to improve the adsorption and removal performance of dissolved substances and polymers by the adsorbent. This also has the effect of being effective in terms of device configuration.

〔Effect of the invention〕

As described above, according to the present invention, by providing a purification system separate from the plant operation system, it is possible to purify the intermediate heat medium regardless of the operation of the plant such as the evaporator and without being affected by the plant. There is an effect that it can be done. Further, since the intermediate heat medium sent to the adsorption removal device is heated in advance by the heater, the adsorption removal performance is large and the efficiency is high.

[Brief explanation of drawings]

FIGS. 1 and 2 are system diagrams showing the equipment configuration of a general low boiling point medium power generation plant for explaining the prior art. FIG. 3 is a system diagram showing one embodiment of the present invention. 1... Evaporator, 12... Intermediate heat medium, 15A...
...A storage tank, 15B... B storage tank, 17... Impurity removal device, 24... Warmer.

Claims (1)

[Claims] 1. An intermediate heat medium in a low boiling point medium power generation plant in which a low boiling point medium is mixed with an intermediate heat medium in an evaporator and evaporated, and the low boiling point medium vapor rotates a turbine to drive a generator. In the purification system, a separate purification system is provided that purifies the intermediate heat medium regardless of the operating state of the plant, and the purification system includes a heater that heats the intermediate heat medium to be purified, and a heated intermediate heat medium. 1. A medium purification device for a low boiling point medium power generation plant, comprising at least an adsorption section that purifies a heat medium by chemical adsorption. 2. The medium purification device for a low boiling point medium power generation plant according to claim 1, wherein the purification system includes a separation device that separates the low boiling point medium from the intermediate heat medium. 3 In addition to the purification system, the power generation plant has
The purification system that is normally installed is equipped with a device that removes impurities, dissolved substances, and polymers from the intermediate heat medium, and the purification system is separated from the normally installed purification system by a gate valve and is located separately. The purification system uses an intermediate heat medium
A low boiling point medium separator, a storage tank, a purification pump,
The medium purification device for a low-boiling point medium power generation plant according to claim 1, characterized in that it is comprised of a combination of a warmer, a contaminant removal device, and a dissolved matter/polymer adsorption/removal device. 4. The low boiling point medium power generation plant according to claim 1, wherein the purification system separately includes a storage tank for storing the medium before purification and a storage tank for storing the clean medium after purification. media purification device. 5. The warmer has a heating function to improve the performance of separating the low-boiling point medium from the intermediate heat medium, and also a heating function to improve the adsorption and removal performance of dissolved substances and polymers. A medium purification device for a low boiling point medium power generation plant according to claim 1, characterized in that it is configured as follows. 6. The purification system is equipped with piping and valves that can freely change the combination of the storage tank, the warmer, the impurity removal device, and the dissolved matter/polymer removal device. Range 1st to 5th
A medium purification device for a low-boiling point medium power generation plant according to any one of the items.