JPS6350584Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a gas cooling system for an incinerator, and mainly relates to a gas cooling system for an incinerator that has a gas cooling chamber directly connected to the upper part of the gas outlet of the furnace body.

In incinerators for municipal waste, etc., the combustion exhaust gas generated in the combustion section of the furnace is at a fairly high temperature of 800 to 900 degrees Celsius or higher. Over time, various inconveniences occur. Therefore, the exhaust gas is sent to a gas cooling chamber and cooled to around 300°C by water cooling.

As the method for reducing the temperature of the exhaust gas, the cooling water spray nozzle facing into the gas cooling chamber may be of a normal spray type or may be of a so-called return type to return excess water. Both methods are similar in that they spray cooling water, but the conventional spray method has drawbacks such as the fact that the tip of the nozzle is heated, making it more likely to be damaged by heat. On the other hand, in the case of the return method, the water supply side piping and the return side piping are connected to the nozzle, and the water flow is constantly flowing through the return side piping, so there is no risk of the nozzle tip being damaged by heating, and the exhaust gas temperature It is also convenient for controlling the temperature to a set temperature.

However, in the case of the above-mentioned return method, when the amount of sprayed water decreases due to a decrease in exhaust gas temperature, a part of the surplus water overflows from the nozzle tip and drips. That is, since water is always present in the return side piping, when the amount of sprayed water is reduced, all of the excess water cannot be returned, and a portion of it overflows from the nozzle tip. For example, the first
By arranging multiple nozzles A, B, C, and D in the vertical direction as shown in the figure, and by reducing the amount of water sprayed, the water in the upper portions a, b, and c of the pipes will flow to the nozzles B and C. , D will overflow. This is even more noticeable when valve M is completely closed. The water that overflows in this way drips as water droplets, and in the case of an incinerator with a gas cooling chamber directly installed above the gas outlet of the furnace body, the water droplets drip onto the hearth below and damage the hearth. However, there are disadvantages such as lower combustion efficiency in the furnace.

The present invention was developed in view of the above, and is a gas cooling system that has a structure in which a return-type cooling water spray nozzle, in which the water supply side piping from the pump and the return side piping are connected, faces into the gas cooling chamber. In order to improve the drainage inside the pipes, especially when the amount of water sprayed from the nozzle is 0, all the water in the water supply side pipe and return side pipe is removed at once, so that the water at the top of the pipe does not flow into other nozzles. So,
This prevents excess water from overflowing from the nozzle.

That is, in the present invention, a part of the water supply side piping is provided with a valve that closes when the exhaust gas temperature falls below a predetermined value, a bypass is provided to bypass this valve, and a part of the return side piping is also provided with a bypass. The present invention is characterized in that a bypass is provided to bypass the flow rate adjustment valve, a valve that opens when the exhaust gas temperature falls below a predetermined value is provided in both of these bypasses, and a drain pipe is connected to both of the bypasses.

Next, embodiments of the present invention will be described based on the drawings.
In Figure 2, 1 is the furnace body of the incinerator, 2 is the gas cooling chamber, and 3 is the electrostatic precipitator. It is directly connected to the upper part of the gas outlet 4. Reference numerals 5a and 5b are return type cooling water spray nozzles that face two places, upper and lower, in the upper part of the gas cooling chamber 2, and the water supply side piping 6 and the return side piping 7 from the pump P are part of them, respectively. They are branched and connected at the upper part by branch pipes 6a, 6b and 7a, 7b.

A part of the water supply side piping 6 is provided with a valve M ₁ such as an electric valve or an electromagnetic valve that is electrically connected to a temperature sensor T provided in the exhaust gas path from the gas cooling chamber 2 to the electrostatic precipitator 3. The valve _M1 is set to be closed by electrical communication when the exhaust gas temperature detected by the temperature sensor T falls below a predetermined temperature. This water supply side piping 6 is provided with a bypass 8 that detours around the valve _M1 . Also, in a part of the return side piping 7, there is a flow rate adjustment valve such as an electric or electromagnetic valve electrically connected to the temperature sensor T.
Hv is provided, which opens and closes depending on the exhaust gas temperature to adjust the amount of water sprayed from the nozzles 5a and 5b and control the temperature to a set temperature. This return side piping 7 is also provided with a bypass 9 that bypasses the flow rate adjustment valve Hv. Each of the bypasses 8 and 9 on the water supply side and the return side is provided with valves M ₂ and M ₃ such as electric or electromagnetic valves electrically connected to the temperature sensor T, and especially these two valves M ₂ Contrary to the above-described valve M ₁ , valve M ₃ is normally closed and is set to close when the exhaust gas temperature falls below a predetermined temperature. Furthermore, both bypasses 8
and 9 are connected to a drain pipe 10. In the figure, 11 indicates a port for receiving return water from the return side piping 7, and 12 indicates a port for receiving drainage from the drain pipe 10.

In addition, although the above-mentioned Example showed the case where two cooling water spray nozzles 5a and 5b were provided, it can also be implemented by providing one or three or more cooling water spray nozzles.

The present invention is constructed as described above, and when the normal pump P is in operation, the flow rate adjustment valve Hv of the return side piping 7 is opened according to the exhaust gas temperature, and the amount of water sprayed from the nozzles 5a and 5b is to control the set temperature. When the exhaust gas temperature falls below a preset temperature, the valve _M1 of the water supply pipe 6 closes to cut off the water supply from the pump P, and the nozzles 5a, 5
The amount of spray water from b becomes 0, and at the same time valves M ₂ of bypasses 8 and 9 on the water supply side and return side
Since _M3 is opened, the water in the nozzles 5a, 5b and the pipes 6, 7 is immediately discharged to the outside of the pipe via the drain pipe 10 via the bypasses 8, 9.

Therefore, according to the present invention, not only is unnecessary spraying not performed when the exhaust gas temperature is below a predetermined temperature, but also when the amount of spray water is 0, the water in the pipe is quickly discharged outside the pipe, so that excess water is No water overflows from the nozzle and drips as water droplets. In particular, even when a plurality of nozzles are arranged above and below, water in the upper part of the piping will not flow into the nozzle in the lower part but will be discharged. In particular, since there is no risk of water droplets dripping from the nozzle tip, the hearth will not be damaged or the combustion efficiency will be harmed even when the gas cooling chamber is provided above the gas outlet of the furnace body.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an example of conventional gas cooling equipment, and FIG. 2 is a system diagram showing an embodiment of the present invention. 1...furnace body, 2...gas cooling chamber, 3...electrostatic precipitator,
4...Gas outlet, 5a, 5b...Cooling water spray nozzle,
6...Water supply side piping, 7...Return side piping, 8, 9...
Bypass, 10...Drain pipe, _M1 , _M2 , _M3 ...Valve, Hv...Flow rate adjustment valve.

Claims (1)

[Scope of utility model registration request] In the gas cooling equipment for an incinerator, a gas cooling chamber is provided in the exhaust gas path, and a return type cooling water spray nozzle connected to a water supply side piping from a pump and a return side piping is faced into the gas cooling chamber, A part of the water supply side piping is equipped with a valve that closes when the exhaust gas temperature falls below a certain level, and a bypass is installed to bypass this valve, and a part of the return side piping is also equipped with a bypass that bypasses the flow rate adjustment valve. 1. A gas cooling system for an incinerator, characterized in that both bypasses are provided with valves that are opened when the exhaust gas temperature falls below a predetermined value, and drain pipes are connected to both bypasses.