JPS6033319Y2 - Turbocharger with intake air heater for diesel engine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a supercharger for a diesel engine, and more particularly to a supercharger equipped with an intake air heater.

Conventionally, the temperature of the intake air at the air intake port of the supercharger of a diesel engine has not been particularly controlled, as it remains the indoor temperature at that time, that is, the indoor temperature depending on the season and weather.

Therefore, when the intake air temperature is low, the density of the air is high, so the amount of intake air increases, and the amount of air for combustion, that is, the excess air ratio increases, and the parts of the combustion gas system are supercooled, causing the sulfur dioxide in the gas to increase. Gas may be exposed and cause sulfuric acid corrosion.

Additionally, if an exhaust gas economizer is installed that recovers waste heat from exhaust gas to produce steam, if the excess air ratio increases and the exhaust gas temperature decreases, the amount of steam generated by the exhaust gas economizer decreases, resulting in a shortage of steam. Sometimes.

Therefore, when the outside air temperature is low, it is conceivable to preheat the intake air to bring the temperature above a certain level.

The purpose of the present invention is to provide a supercharger equipped with an intake air heater that preheats intake air, thereby eliminating insufficient steam volume and sulfuric acid corrosion in the exhaust gas economizer with a simple configuration.

The present invention is characterized in that a heating tube is placed opposite the air intake port of the supercharger, and the intake air is preheated by the heating tube and then flows into the air intake port of the supercharger.

The heating tube preferably comprises a finned annular heating tube having a pair of connecting portions, and a plurality of the annular heating tubes are arranged and connected to each other to form a series of fluid passages.

In this way, the heating capacity can be changed by changing the number of annular heating tubes, and the heating tubes can be standardized and manufactured at low cost.

An embodiment of the present invention will be described below based on the drawings.

First, to explain the entire system with reference to Fig. 1, 1 is a diesel engine, and its exhaust gas G drives a turbine 3 of a supercharger 2, and then is sent to an exhaust gas economizer 5, where it is cooled and released into the atmosphere. Ru.

On the other hand, combustion air A is compressed by a compressor 4 driven by a turbine 3 of the supercharger 2 and sent to the diesel engine 1.

An intake air heater 7 is attached to the air intake port 6 of the supercharger 2, and the intake air heater 7 uses the cooling water W of the cylinder jacket of the diesel engine 1 sent through the water supply pipe 8 as a heat source to heat the intake air A. heat up.

A flow rate control valve 9 for controlling the flow rate of cooling water W is interposed in the middle of the water supply pipe 8.

10a and 10b are temperature detectors provided near the air intake port 6 and the inlet of the exhaust gas economizer 5, respectively;
The detection signal is sent to a control box 11, and the flow rate control valve 9 is controlled by a command signal from the control box 11.

When the temperature detected by the temperature detectors 10a and 10b is below a set value, the control box 11 opens the flow rate control valve 9 according to the temperature difference, and heats the intake air so that the temperature becomes above the set value. .

As shown in FIGS. 2 and 3, the intake air heater 7 connects a plurality of finned annular heating tubes 13 to the air intake port 6 of the supercharger 2.
Each annular heating tube 13 is formed with a pair of connecting portions 14a and 14b in the diametrical direction, and by connecting the connecting portions 14a and 14b of adjacent annular heating tubes 13 as appropriate. A series of heated fluid passages communicating with the inlet 15 and the outlet 16 are formed.

The connecting portions 14a and 14b are formed by providing a connecting flange at the tip of a connecting tube that communicates with the inside of the annular heating tube 13 and extends laterally.

In addition, in the illustrated example of the intake air heater 7, the annular heating pipes 13 located on both sides thereof have connecting portions 14a and 14.
A connecting pipe is provided only on one side of one of the connecting parts of b,
Otherwise, connection pipes are provided on both sides, and each connection part 14a and 14b is connected between adjacent annular heating pipes 13, respectively.
The annular heating tubes 13 are connected in parallel.

However, the connection method of the annular heating pipes 13- can be selected arbitrarily, and connecting pipes are provided on both sides at the connecting parts 14a and 14b for all the annular heating pipes 13, thereby completely standardizing and eliminating unnecessary connecting pipes. A blind plate may be installed about the area.

If the intake air heater 7 is constructed of a plurality of annular heating tubes 13 connected to each other in this way, if the required heating capacity changes,
If the number of annular heating pipes 13 can be increased or decreased and therefore detailed control is not required, the annular heating pipes 13 can be added or removed depending on the season or the installation location, and the flow rate control valve shown in FIG. 9. The temperature detectors lea and 10b and the control box 11 can also be omitted.

According to the diesel engine supercharger of the present invention, as is clear from the above explanation, for example, one or two heating pipes enter the intake port in summer, and three or four heating pipes enter the inlet in winter. It is possible to control the temperature of the air as required.

It is also possible to control the temperature by appropriately increasing or decreasing the number of heating tubes depending on the temperature at the installation location.

Since temperature control can be greatly adjusted by increasing or decreasing the number of heating tubes as appropriate, it is possible to easily fine-tune the heating temperature by adjusting the flow rate and temperature of the heating medium flowing inside the heating tubes. It is.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of a diesel engine supply/exhaust system using a supercharger according to the present invention, Fig. 2 is a partial cross-sectional front view of an embodiment of the present invention, and Fig. 3 is the m of Fig. 2. -m arrow view. 1... Diesel engine, 2... Supercharger, 6... Air intake port, 7... Intake air heater, 13... Annular heating tube, 14a, 14b...
... Connection part, 15 ... Inflow port, 16 ...
... Outlet.

Claims (1)

[Scope of utility model registration request] An appropriate number of heating tubes are removably arranged facing the air intake port of the turbocharger, and an appropriate number of connecting portions are provided at appropriate locations on the inner surface of each heating tube, and the connecting portions are opposed to each other. A supercharger with an intake air heater for a diesel engine, characterized in that a series of fluid passages are formed by connecting them together.