JPS63226501A - Engine exhaust-heat recovery type steam generator - 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] [Field of Industrial Application] The present invention is a device for generating steam that can be used as a heat source for hot water supply, space heating, etc. by using cooling exhaust heat of an engine. The present invention relates to an engine exhaust heat recovery type steam generation device that is provided with a separator that separates the coolant from the coolant jacket into gas and liquid, and a compressor that extracts and compresses the steam in the separator.

[Conventional technology]

In this type of engine exhaust heat recovery type steam generator,
The existence of a compressor allows the steam to be heated to a high temperature, which expands its range of uses as a heat source and allows the engine cooling exhaust heat to be used effectively throughout the year without wasting it. In order to achieve this, it is necessary to generate steam efficiently in the separator.

Therefore, in the past, the coolant in the separator was heated by engine exhaust gas to promote steam generation (for example, Japanese Utility Model Application Publication No. 128104/1983).

[Problem that the invention attempts to solve]

However, in the conventional method, by heating,
In order to promote evaporation, the pressure in the system that circulates the coolant between the coolant jacket and the separator is maintained at a pressure that does not generate steam in the coolant jacket, and the heat transfer surface of the coolant jacket is Although it is easy to prevent scale from adhering to the surface, it has the following disadvantages.

In other words, since steam is promoted by cooling and heating by engine exhaust heat, a heat exchanger between the coolant and the engine exhaust is essential, and soot containing sulfides in the engine exhaust adheres and accumulates on the heat exchanger. The heat exchanger corrodes prematurely, resulting in high running costs.

An object of the present invention is to enable efficient steam generation in a separator without causing such inconveniences.

[Means for solving problems]

The characteristic configuration of the engine exhaust heat recovery type steam generator according to the present invention is that a constant pressure expansion valve is interposed in the coolant flow path from the coolant jacket to the separator, and the functions and effects thereof are as follows. It is as follows.

[For production]

The compressor sucks steam from the separator to lower the pressure inside the separator, and this lower pressure promotes evaporation in the separator, so there is no need to heat the cooling liquid in the separator.
Alternatively, even if heating is required, it will only be auxiliary. Moreover, even though the pressure inside the separator is reduced as described above, a low-pressure expansion valve is provided to prevent the pressure inside the coolant jacket from becoming low, so evaporation of the coolant occurs inside the coolant jacket. No pressure can be maintained.

〔Effect of the invention〕

Therefore, according to the present invention, scale adhesion on the jacket heat transfer surface due to steam generation within the coolant jacket is prevented, and while the desired engine cooling is guaranteed, the coolant is heated by the engine exhaust. This eliminates the need for a heat exchanger, or only requires an auxiliary one that can be used less frequently, promoting steam generation at low running costs and creating an efficient and stable high-temperature heat source.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

An engine exhaust heat recovery type steam generator that uses the cooling exhaust heat of the engine (1) to generate steam that can be used as a heat source for various types of heat is basically generated from the cooling water jacket (2) of the engine (1). Separator (3) that separates high-temperature cooling water into gas and liquid
, a compressor (5) driven by a motor (4) to take out and compress the water vapor in the separator (3), and this compressor (
A condenser (7) that heats the heat medium circulated between the load device (6) and the load device (6) by the condensing action of the steam compressed in
).

and a separator (3) from the cooling water jacket (2).
A constant pressure expansion valve (9) is installed in the cooling water flow path (8) to change the cooling water isenthalpically and evaporate it, and the cooling water returns from the separator (3) to the cooling water jacket (2). The flow path (10) includes a cooling water trough (12) that cools the returned cooling water by heat exchange with the heat transfer medium supplied by the pump (11), a cooling water jacket (2), and a separator (3). ) is interposed with a circulation pump (13) for circulating cooling water between the two. and the condenser (7) and the separator (
3) means a return channel (1) equipped with a steam trap (14) to return condensed cooling water (saturated water) to the separator (3).
5) is connected.

Therefore, the steam generator absorbs engine exhaust heat by the cooling water in the cooling water jacket (2) and uses the constant pressure expansion valve (9).
between the cooling water jacket (2) and the separator (3), in which heat is radiated from the cooling water by evaporation in the separator (3), and heat is radiated from the cooling water in the cooling water colander (12). Cooling water circulation in the engine (1) cools the engine (1) and recovers waste heat, generates steam in the separator (3), increases the temperature by pressurizing the steam in the compressor (5), and cools the engine (1). ) are sequentially performed to heat the heat medium using recovered exhaust heat. And, the steam generator is
The structure is configured to reduce the pressure inside the separator (3) by extracting water vapor from the separator (3) by compression a (5) and promote evaporation in the separator (3). The valve (9) is configured to prevent the inside of the cooling water jacket (2) from lowering, thereby preventing steam generation within the cooling water jacket (2).

Next, the heat balance of the steam generator will be described with reference to specific numerical values.

Cooling water with a flow rate of 17,000 kg/h and a temperature of 75°C reaches 85°C due to heat absorption by the cooling water jacket (2) with a heating capacity of 170,0000 kcal/h, and is then heated to 85°C by the constant pressure expansion valve (9). The enthalpy changes, and in the separator (3), the pressure is 0.52 kg/cm" abs and the temperature is 82°.
C. Enthalpy is separated into saturated gas with 6319 kcal/kg and saturated water. The saturated steam has a flow rate of 94
．． 2kg/h and compressor (5) 2.03kg/cm”a
The pressure is increased to bs (saturation temperature 120°C),
Temperature is 345”C, enthalpy is 756.7kcal/
kg of steam and is supplied to the condenser (7), releasing a heat of condensation of 60.0 OOkcal/h, and the pressure becomes 2.0 kg.
03kg/cm"abs, the water becomes saturated water with a temperature of 120°C and returns to the separator (3). By evaporation from the saturated water in the separator (3), the amount of heat is 48, 200kcal /
h, the temperature reaches 82.2℃, and the cooling water cooler (1
2), and the temperature becomes 75°C.

In addition, the steam generator configured in this way is used as a heat source for various purposes such as exercise and ships, and the heat medium for heat radiation supplied to the cooling water cooler may be water cooled by a cooling tower or water cooled by a cooling tower. These are seawater and river water.

[Another example]

Another embodiment of the present invention will be shown below.

Although water is shown as the cooling liquid in the steam embodiment, any type of cooling liquid may be used.

A means for heating the coolant in the separator (3) may also be provided.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

The drawings are schematic configuration diagrams showing embodiments of the present invention. (1)...Engine, (2)...Cooling fluid jacket, (3)...Separator, (5)...
... Compressor, (8) ... Coolant flow path, (
9)... Constant pressure expansion valve.

Claims (1)

[Claims] A separator (3) for separating the coolant from the coolant jacket (2) of the engine (1) into gas and liquid is provided, and the separator (3)
This is an engine exhaust heat recovery type steam generator equipped with a compressor (5) for extracting and compressing steam from the engine, and the cooling liquid flow path (8) from the cooling liquid jacket (2) to the separator (3).
) is equipped with a constant pressure expansion valve (9).