JPS6029862B2 - Solar thermal steam generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a solar steam generation device using a heat medium, and particularly to a steam generation amount control means for stably supplying steam.

[Technical background of the invention]

One way to generate steam using solar heat is to collect sunlight and directly heat water, but there are problems in terms of efficiency.

Therefore, recently, a method has been adopted in which a heat medium with a high heat absorption rate is heated by sunlight, and water is heated by this heat medium. [Problems with Background Art] However, this method also has the following problems.

Since solar energy changes depending on the weather, the amount of heating of the heat medium is not constant. Therefore, the generation of steam is most generally not constant. For this reason, when steam utilization equipment requires a stable supply of steam, equipment for storing heat medium or steam as well as an auxiliary energy generation device are required, resulting in an increase in equipment costs. In addition,
In general industry, when steam is used in one workplace or building, it is often the case that the steam is divided into multiple steam types, such as for power generation, process use, heating use, etc.

Among these, there are those that require a stable supply, such as steam for process heating, and those that do not necessarily require a stable supply of steam. [Object of the invention] The present invention was made in view of the above circumstances,
The purpose is to provide a solar thermal steam generator with a simple configuration and low equipment cost, which can stably supply either high-pressure steam or low-pressure steam even if the amount of solar radiation changes.

[Summary of the invention]

In order to achieve the above object, the present invention is characterized by the following configuration.

That is, the present invention supplies a high-temperature heat medium heated by solar heat to a high-pressure steam generator to generate high-pressure steam, and also guides the heat medium used in the high-pressure steam generator to a low-pressure steam generator. A bypass pipe is provided to generate low-pressure steam and bypass the heat medium supplied to the high-pressure steam generator, and a control valve is provided to adjust the bypass amount of the heat medium by the bypass pipe. The present invention is characterized in that the supply amount of either high-pressure steam or low-pressure steam is stabilized regardless of changes in the amount of solar radiation by adjusting the amount according to changes in the amount.
[Embodiments of the Invention] The present invention will be described in detail below with reference to embodiments shown in the drawings.

The drawing is a block diagram showing the configuration of an embodiment of the present invention. Reference numeral 1 denotes a solar heat collector installed to collect solar heat and use the heat energy to heat a heat medium with a high heat absorption rate. The heat medium heated by the solar heat collecting device 1 is sequentially supplied in series to the high pressure steam generator 3A and the low pressure steam generator 3B via the heat medium circulation system 2, and then returned to the heat collecting device 1 again. and then reheated. The high-pressure steam generator 3A heats water introduced into the generator via the water supply pipe 4A with the heat medium to generate high-pressure steam, and sends this to the outside via the steam pipe 5A.

The low-pressure steam generator 3B heats water introduced through the water supply pipe 4B with the heat medium to generate low-pressure steam, and sends this to the outside through the steam pipe 5B. By the way, bypass pipes 6A and 6B are respectively disposed between the heat medium inlet and outlet of the high pressure steam generator 3A and the low pressure steam generator 3B'.

The bypass pipes 6A and 68 are provided with bypass amount adjusting valves 7A and 7B, respectively. In this embodiment, the control valve 7B is used as a maintenance valve and is not used for control. Further, a regulating valve 8 for adjusting the amount of heat medium inflow is provided at the heat medium inlet of the high pressure steam generator 3A.
The device configured as described above operates as follows. When the heat medium heated by the solar heat collector 1 is supplied to the high pressure steam generator 3A via the system 2, the water introduced into the high pressure steam generator 3A is heated and becomes high pressure steam, which is then passed through the steam pipe. It is sent to the outside via 5A. Furthermore, when the heat medium is supplied to the low pressure steam generator 3B, the water introduced into the low pressure steam generator 3B is heated and becomes low pressure steam.
This is sent to the outside via the steam pipe 5B. If it becomes necessary to ensure a stable supply of high-pressure steam, the amount of heat medium flowing through the bypass pipe 6A is controlled by the control valve 7A and It is adjusted by a regulating valve 8.

That is, when the amount of solar radiation is high, the flow rate of the heat medium flowing through the bypass pipe 6A is increased, and when the amount of solar radiation is low, the flow rate of the heat medium flowing through the bypass pipe 6A is decreased. By doing this, the high pressure steam generator 3A
The amount of heat of the heat medium supplied to the is kept constant. Therefore, the amount of high-pressure steam generated by the high-pressure steam generator 3A is made constant, and stable supply is achieved. In this case, a large amount of heat medium is supplied to the low pressure steam generator 3B when the amount of solar radiation is high, and a small amount of heat medium is supplied when the amount of solar radiation is low. Therefore, the amount of low-pressure steam generated changes in proportion to the amount of solar radiation. Next, when it becomes necessary to stably supply low-pressure steam, the bypass pipe 6A is
The flow rate of the heat medium flowing through is adjusted by the control valve 7A.

That is, when the amount of solar radiation is large, the bypass amount by the bypass pipe 6A is reduced, and a large amount of heat medium is supplied to the high pressure steam generator 3A. In this case, the amount of high-calorie heat medium directly supplied to the low-pressure steam generator 3B through the bypass pipe 6A is reduced. The amount of heat of the heat medium coming out of the high pressure steam generator 3A is low. As a result, even if the amount of solar radiation increases, the amount of heat of the heat medium supplied to the low pressure steam generator 3B can be kept constant. In this case, the extra thermal energy is effectively used in the high pressure steam generator 3A. When the amount of solar radiation is low, the amount of bypass by the bypass pipe 6A is increased so that the heat medium with a high calorific value is guided directly to the low pressure steam generator 3B. In this way, the low pressure steam generator 3B
It is possible to keep the amount of heat of the heat medium supplied to the device constant.
Therefore, low pressure steam can be stably generated and supplied. In this way, if you want to stably supply either high-pressure steam or low-pressure steam to steam-utilizing equipment, you can easily achieve this by simply adjusting the amount of bypass of the heat medium. Backup equipment becomes almost unnecessary.

If you want to stably supply both high-pressure steam and low-pressure steam, install backup equipment as necessary on either the high-pressure side or the low-pressure side, and apply the above-mentioned stabilization measures to the other side. Just do it. In this embodiment, the case has been described in which the control valve 7B provided in the bypass pipe 6B of the low-pressure steam generator 38 is used as a maintenance valve and is not used for control.

However, it is of course possible to use it as a control valve if necessary.In particular, a third steam generator is installed downstream of the low-pressure steam generator 3B, and the steam generator 3B is connected to the high-pressure steam generator. When the third steam generator is controlled as a low-pressure steam generator, it is used in the same way as the control valve 7A. [Effects of the Invention] According to the present invention, heat is supplied to either the high-pressure steam generator or the low-pressure steam generator by controlling the flow rate of the heat medium flowing through the heat medium bypass pipe attached to the high-pressure steam generator. Since the heat content of the medium is kept constant, even if the amount of solar radiation changes, either high-pressure steam or low-pressure steam can be stably supplied in a state that matches the energy requirements. Since backup equipment such as an energy generation device is not particularly required, the configuration is simple, and it is possible to provide a solar heat-utilizing steam generator that can reduce the equipment cost of the steam-utilizing equipment.

[Brief explanation of the drawing]

The drawing is a block diagram showing the configuration of an embodiment of the present invention. 1...Solar heat collector, 2...Heat medium circulation system, 3A...High pressure steam generator, 3B...
Low pressure steam generator, 4A, 48... Water supply pipe, 5A
, 5B...Steam pipe, 6A, 6B...Heat medium bypass pipe, 7A, 7B...Bypass amount adjustment valve, 8...Adjustment valve.

Claims (1)

[Claims] 1. A high-pressure steam generator that generates high-pressure steam using a high-temperature heat medium heated by solar heat, and a low-pressure steam generator that generates low-pressure steam using the heat medium used in this high-pressure steam generator. , consisting of a bypass pipe provided to bypass the heat medium supplied to the high-pressure steam generator, and a control valve provided to adjust the bypass amount by the bypass pipe, and the control valve is used to adjust the amount of solar radiation. A solar thermal steam generator characterized in that the supply amount of either high-pressure steam or low-pressure steam is stabilized by adjusting the amount according to the amount of supply.