JPS6337282B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an electric steam generator for the purpose of supplying steam for soot blowing to a heat medium type exhaust gas heater in a ship employing a heat medium heating system without any steam generator. It is related to vessels.

In ships, heat is generally recovered from the exhaust gas of the main engine using an exhaust gas boiler or a heat medium type exhaust gas boiler, and is used for heating various equipment on the ship. Under these current circumstances, high-pressure water or high-pressure air is generally used to clean soot from heat-medium exhaust gas heaters on ships that use only a heat-medium heating system without using any steam generators. It is. However, conventional methods have poor soot removal efficiency, require increased capacity with limited equipment, and are labor intensive.

In view of the above points, the present invention is configured to generate steam using a clean water line installed in a ship and electricity, and automatically clean the heat transfer surface of a heat transfer type exhaust gas heater. This is an electric steam generator featuring:

The present invention will be explained based on the drawings. The figure is an explanatory diagram regarding the electric steam generator in the present invention. In the figure, 1 is the main body of the electric steam generator. 2
is an electric heater inserted into the main body 1 of the electric steam generator, and while the electric steam generator is in operation, the water in the main body 1 of the electric steam generator is always in a energized state, that is, the water in the main body 1 of the electric steam generator is in a heated state. 5 is a water supply pipe to the electric steam generator main body 1, and a water supply electric valve 6 is inserted in the middle of the water supply pipe 5. The upstream side of the water supply pipe 5 is connected to a fresh water line (not shown) inside the ship, and is always in a pressurized state (water can be supplied). 9 is a heating medium type exhaust gas heater that uses exhaust gas from the main engine and auxiliary engine of the ship. 3
is a steam pipe for cleaning soot from the heat transfer surface of the heat medium type exhaust gas heater, and connects between the exhaust gas heater 9 of the heat medium type exhaust gas heater and the electric steam generator main body 1. A steam electric valve 4 is inserted into the steam pipe 3. Reference numeral 7 denotes a water level detection device, which is inserted into the water level control section of the electric steam generator main body 1. When a specified water level within the electric steam generator main body 1 is detected, a signal is sent to the electric water supply valve 6 to close the electric valve. 8 is a steam pressure switch, which is attached to the steam part of the electric steam generator main body 1, and when it detects a pressure higher than the high setting pressure, it sends a signal to the steam electric valve 4 to open it, and thus, The heat transfer surface of the heat transfer exhaust gas heater is cleaned of soot using steam generated from the self-evaporation of steam and water in the electric steam generator. If a pressure lower than the low set pressure is detected, the steam electric valve 4 is closed to stop soot cleaning, and the water supply electric valve 6 is opened to maintain the pressure of the clean water line (not shown) in the electric steam generator main body 1. supply water to

Next, the effect will be explained. First, at the time of starting, the electric heater 2 is energized and at the same time the pressure switch 8 is turned on.
A signal indicating a pressure lower than the low set pressure is issued and the electric water supply valve is opened. When the water level in the electric steam generator main body 1 rises and the water level detection device 7 detects the water level, a signal is sent to the electric water supply valve 6 to close the valve and stop water supply. Note that during this time, the water in the electric steam generator is being heated by the electric heater 2. Thus, the vapor pressure within the electric generator main body 1 gradually increases. When the steam pressure exceeds the high setting pressure, a signal is issued from the steam pressure switch, the steam electric valve is opened, and the steam in the electric steam generator main body 1 and the steam generated by self-evaporation are transferred to the heat transfer surface of the heat medium type exhaust gas heater. Spray to clean soot. Steam is supplied for soot cleaning, and when the steam pressure switch detects a pressure below the low set pressure, it sends a signal to the steam motorized valve 4 and the water supply motorized valve 5. The steam electric valve 4 closes to stop cleaning the soot on the heat transfer surface of the heat medium type exhaust gas heater, and the water supply electric valve 6 opens to resume water supply. Thereafter, the water level detection rod and the steam pressure switch are used for a fixed cycle (for example, 10 hours or 20 hours depending on the appropriate combination of heater capacity and retained water amount).
The above operation is repeated at intervals of time, etc.).

As explained in detail above, the present invention provides an electrically heated steam generator with an electric water supply valve and a steam electric valve, and uses a water level detection rod and a pressure switch to automatically supply water and take out steam at regular intervals. It is something. According to the present invention, it is possible to provide an electric generator that has a simple structure and can be easily installed for cleaning soot from a heat medium type exhaust gas heater employed in a ship without any steam generator.

[Brief explanation of the drawing]

The figure is an explanatory diagram regarding the electric steam generator in the present invention. 1 is the main body of the electric steam generator, 2 is the electric heater, 3 is the steam pipe, 4 is the steam electric valve, 5 is the water supply pipe,
6 is a water supply electric valve, 7 is a water level detection device, 8 is a steam pressure switch, and 9 is a heat medium type exhaust gas heater.

Claims (1)

[Scope of Claims] 1. The following means: An electric steam generator main body 1 disposed in the fresh water line of a ship, which is inserted into the electric steam generator main body 1 and is constantly operated while the electric steam generator is in operation. An electric heater 2 which is in an energized state, that is, a heating state, a steam electric valve 4 installed in a steam pipe 3 piped from the steam part of the electric steam generator main body 1 to the load side, an electric steam generator A water supply motorized valve 6 installed in a water supply pipe 5 piped to the water section of the main body 1 is inserted into the water level control section of the electric steam generator main body 1, and closes the water supply motorized valve 6 when the water level is detected. A water level detection device 7 that emits a signal to detect the steam pressure of the electric steam generator main body 1, opens the steam motorized valve 4 if it is above the high set pressure, and closes the steam motorized valve 4 if it is below the low set pressure to supply water. An electric steam generator comprising: a pressure switch 8 that issues a signal to open an electric valve.