JP4584238B2 - Exhaust gas cooling method and apparatus - Google Patents

Description

  The present invention relates to an exhaust gas cooling method and apparatus, and more particularly to an exhaust gas cooling method by indirect air cooling and an improvement of the apparatus.

  2. Description of the Related Art Conventionally, as a cooling method using indirect air cooling of exhaust gas, a method using a cooling device shown in FIG. 2 has been proposed.

The exhaust gas cooling device 20 used in this exhaust gas cooling method is a housing divided into a cooling air chamber A and gas chambers G, G opposed to each other across the cooling air chamber A by partition walls 2b, 2b. 2, a cooling fan F for supplying cooling air to the cooling air chamber A, and a number of cooling pipes 2 a communicating between the gas chambers G that pass through the cooling air chamber A and face each other.
At the lower part of the gas chamber G, a funnel-shaped dust hopper 2c is formed to store dust released from the passing exhaust gas. By opening and closing the two-stage damper D at an appropriate time, it is sent to the discharge conveyor 9, It is trying to discharge to the place.
In the illustrated example, the casing 2 is connected in series by an exhaust gas relay pipe 5 that communicates with one gas chamber G and a cooling air relay pipe 8 that communicates with the cooling air chamber A. The number of bodies 2 is not limited to three.

  And this cooling device 20 receives the high temperature exhaust gas discharged | emitted from a garbage incinerator, an electric furnace, etc. (illustration omitted) from the inlet 3, The gas chamber G in the housing | casing 2 of the 1st (left side of the figure) , Passing through the cooling pipe 2a, the gas chamber G and the relay pipe 5, passing through the second and third casings 2, and being sent from the discharge port 4 to a dust collector (not shown) as the next process. Yes.

The exhaust gas is cooled when passing through the cooling pipe 2a cooled by the cooling air sent from the cooling fan F through the cooling air supply pipe 6 to the cooling air chamber A. For example, the exhaust gas at about 400 to 450 ° C. is 200 Cool to ~ 250 ° C.
The cooling air is supplied to the cooling air supply pipe 6 from the cooling fan F, and is cooled via the cooling air chamber A of the casing 2 and the cooling air relay pipe 8 that communicates the cooling air chamber A of each casing 2. It is discharged from the air discharge pipe 7.

  By the way, this exhaust gas cooling device 20 sucks outside air with the cooling fan F and introduces it into the cooling air chamber A to cool the cooling pipe 2a. When the outside air temperature is high, the cooling efficiency is lowered and the exhaust gas temperature is reduced. When the temperature is higher than expected, there is a problem that the cooling pipe in the upstream casing is easily consumed due to the effect of high temperature oxidation.

  In view of the problems of the conventional exhaust gas cooling method and apparatus therefor, the present invention does not decrease the cooling efficiency even when the outside air temperature is high, and when the exhaust gas temperature becomes higher than expected. Another object of the present invention is to provide an exhaust gas cooling method and apparatus capable of preventing the cooling pipe in the upstream casing from being consumed due to the effect of high-temperature oxidation.

To achieve the above object, a method of cooling an exhaust gas of the present invention, by cooling by the cooling air outside surface of the cooling tube high-temperature exhaust gas passes through the interior, in the cooling method of the exhaust gas cooling gas, the cooling contacting the liquid in the cooling air in the piping where air passes, and wherein lowering the temperature of the cooling air.

  In this case, the temperature of the cooling air to be supplied and the exhaust gas temperature to be introduced are measured, and the supply amount of the cooling air and the supply amount of the liquid brought into contact with the cooling air can be controlled based on the measured values.

  Further, the exhaust gas cooling device of the present invention for carrying out the above method includes a casing partitioned by a partition into a cooling air chamber and a gas chamber located opposite to each other with the cooling air chamber interposed therebetween, and cooling to the cooling air chamber. In an exhaust gas cooling apparatus comprising a cooling fan for supplying air and a large number of cooling pipes communicating between gas chambers that pass through the cooling air chamber and face each other, a liquid is supplied to the cooling air, and the cooling air is supplied. A liquid supply mechanism for cooling the liquid is provided.

  In this case, the liquid supply mechanism can be composed of a liquid injection nozzle disposed in a pipe through which cooling air passes and a pump that supplies liquid to the liquid injection nozzle.

  In addition, a temperature sensor that measures the temperature of the cooling air to be supplied and the temperature of the exhaust gas to be introduced is provided, and a control mechanism that controls the cooling fan and the liquid supply mechanism according to the value measured by the temperature sensor can be provided. .

According to the cooling method and apparatus for exhaust gas of the present invention, the liquid is brought into contact with the cooling air in the piping through which cooling air passes, by lowering the temperature of the cooling air by the evaporation heat of the liquid, a high outside air temperature even if, by increasing the vaporization heat of the liquid corresponding to the temperature rise of the cooling air lowers the temperature of the cooling air, the cooling efficiency can be prevented that you decrease.
Here, even if the exhaust gas temperature becomes higher than expected by making the contact between the cooling air and the liquid not only in the cooling air supply pipe but also in the cooling air relay pipe communicating with the cooling air chamber of each housing. It is possible to effectively prevent the cooling pipe in the upstream casing from being consumed due to the effect of high-temperature oxidation.

  In addition, when the temperature of the cooling air to be supplied and the exhaust gas temperature to be introduced are measured and the amount of liquid to be brought into contact with the cooling air is determined, when the outside air temperature is low, the amount of liquid to be brought into contact with the cooling air is reduced or stopped. In addition, the amount of liquid brought into contact with the cooling air is changed depending on the introduced exhaust gas temperature, so that condensation in the apparatus can be prevented.

Embodiments of the exhaust gas cooling method and apparatus of the present invention will be described below with reference to the drawings.
In addition, about the structure similar to the apparatus used for the conventional method, the same code | symbol and a series of code | symbol are attached | subjected, and description is abbreviate | omitted.

  FIG. 1 shows an embodiment of the exhaust gas cooling method and apparatus of the present invention.

An exhaust gas cooling device 1 used for this exhaust gas cooling method is a casing divided into a cooling air chamber A and gas chambers G and G located opposite to each other across the cooling air chamber A by partition walls 2b and 2b. 2, a cooling fan F for supplying cooling air to the cooling air chamber A, and a number of cooling pipes 2 a communicating between the gas chambers G that pass through the cooling air chamber A and face each other.
The exhaust gas cooling device 1 is a liquid supply comprising a liquid injection nozzle 11 disposed in a pipe through which the cooling air passes and a pump P for supplying liquid to the liquid injection nozzle 11 in order to cool the cooling air. In addition to the mechanism 10, a plurality of temperature sensors S for measuring the temperature of the cooling air to be supplied and the exhaust gas temperature to be introduced are provided, and the cooling fan F and the pump according to the values measured by these temperature sensors S A control mechanism 13 for controlling P is disposed.

  The liquid supply mechanism 10 is configured to spray liquid from the cooling liquid tank T to the cooling air supply pipe 6 and the cooling air relay pipe 8 communicating with the cooling air chamber A of each housing 2 via the pump P. Therefore, the liquid stored in the cooling liquid tank T is sent from the pump P to the liquid injection nozzle 11 disposed at appropriate positions of the cooling air supply pipe 6 and the cooling air relay pipe 8 through the cooling liquid pipe 12. Sprayed from the liquid jet nozzle 11.

The control mechanism 13 includes a temperature sensor S1 that measures the temperature of the cooling air to be supplied, and a temperature sensor S2 that measures the temperature of the exhaust gas to be introduced. The control mechanism 13 receives the measurement values measured by these temperature sensors S1 and S2, and performs measurement. Based on the value, the cooling fan F and the pump P are controlled. When the outside air temperature is low, the temperature of the cooling air is low. If the exhaust gas temperature to be introduced is within a predetermined range, the supply amount of the cooling air The amount of liquid supplied from the pump P is controlled so as to decrease or stop.
In this case, when the exhaust gas temperature to be introduced is equal to or higher than a predetermined value, a predetermined amount of liquid is supplied from the pump P while maintaining the supply amount of cooling air at a predetermined amount.
Also, when the outside air temperature is high, the temperature of the cooling air becomes high, so the supply amount of the cooling air is increased, and the amount of liquid supplied from the pump P is also supplied in a sufficient amount to increase the heat of vaporization of the liquid. To control.
Thereby, even when the outside air temperature is high, the temperature of the cooling air can be lowered, and the cooling efficiency is not lowered.

In addition to the temperature sensors S1 and S2, a temperature sensor S3 that measures the discharge temperature of the cooled exhaust gas, a temperature sensor S4 that measures the discharge temperature of the supplied cooling air, and a liquid sprayed on the cooling air, if necessary. A temperature sensor such as a temperature sensor S5 for measuring the temperature of can be arranged.
The temperature of each of the temperature sensors S3, S4, and S5 can be transmitted to the control mechanism 13, and the control mechanism 13 can comprehensively control the exhaust gas discharge temperature to be a predetermined temperature.

Next, the operation of the exhaust gas cooling device 1 will be described.
Exhaust gas generated from an exhaust gas generation source such as a garbage incinerator or electric furnace is introduced into the housing 2 from the inlet 3 by a suction fan (not shown) of a dust collector communicated with the outlet 4 of the cooling device 1. .
Then, the introduction temperature of the exhaust gas is transmitted to the control mechanism 13 by the temperature sensor S2.
At this time, the supply temperature of the cooling air measured by the temperature sensor S1 is also transmitted to the control mechanism 13, and based on the transmitted value, the supply amount of the cooling air passing through the cooling air chamber A and the pump P The supply amount of the liquid that is supplied and cools the cooling air is determined.

  The exhaust gas is controlled by the control mechanism 13 and is not particularly limited when passing through the cooling pipe 2a cooled by the cooling air having an appropriate temperature. For example, the exhaust gas is about 400 to 450 ° C. The exhaust gas is cooled to 200 to 250 ° C.

  In this way, the cooling air is brought into contact with the liquid in the pipe through which the cooling air passes, specifically, in the cooling air supply pipe 6 and the cooling air relay pipe 8 communicating with the cooling air chamber A of each housing 2. By reducing the temperature of the cooling air, the temperature of the cooling air introduced into the cooling air chamber can be reduced even when the outside air temperature is high, and the cooling efficiency can be prevented from being lowered.

  Note that water is usually used as the liquid for cooling the cooling air. And when using industrial water for this water, it can replace with the pump P and can also use the original pressure of industrial water.

  As mentioned above, although the exhaust gas cooling method and apparatus of the present invention have been described based on the embodiments, the present invention is not limited to the configurations described in the above-described embodiments, and may appropriately be used without departing from the spirit of the present invention. The configuration can be changed.

  The exhaust gas cooling method and apparatus according to the present invention can be suitably used even when the outside air temperature is high because the cooling air can be prevented from decreasing by bringing the cooling air into contact with the liquid in the pipe through which the cooling air passes. In addition to the new exhaust gas cooling device, it can also be applied to existing cooling devices by adding a liquid supply mechanism, temperature sensor, control mechanism, etc. it can.

It is a front view of the partial cross section which shows one Example of the cooling device of the waste gas of this invention. It is a front view of a partial cross section of a conventional exhaust gas cooling device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Exhaust gas cooling device 2 Case 2a Cooling pipe 2b Bulkhead 3 Inlet 4 Discharge 5 Relay pipe 6 Cooling air supply pipe 7 Cooling air discharge pipe 8 Cooling air relay pipe 9 Discharge conveyor 10 Liquid supply mechanism 11 Liquid injection nozzle 12 Cooling Liquid pipe 13 Control mechanism A Cooling air chamber G Gas chamber F Cooling fan P Pump S Temperature sensor

Claims (5)

By cooling by the cooling air outside surface of the cooling tube high-temperature exhaust gas passes through the interior, and in the cooling method of an exhaust gas to cool the exhaust gas is brought into contact with the liquid in the cooling air in the piping in which the cooling air passes, A method for cooling an exhaust gas, wherein the temperature of the cooling air is lowered.   The temperature of the cooling air to be supplied and the temperature of the exhaust gas to be introduced are measured, and the supply amount of the cooling air and the supply amount of the liquid brought into contact with the cooling air are controlled based on the measured values. Exhaust gas cooling method.   A housing divided into a cooling air chamber and a gas chamber located opposite to each other across the cooling air chamber by a partition, a cooling fan for supplying cooling air to the cooling air chamber, and the cooling air chamber penetrating the cooling air chamber An exhaust gas cooling apparatus comprising a large number of cooling pipes communicating between opposing gas chambers, wherein a liquid supply mechanism for supplying liquid to cooling air and cooling the cooling air is provided. Exhaust gas cooling device. The liquid supply mechanism, the liquid injection nozzle cooling air is disposed in a pipe passing through the cooling apparatus of an exhaust gas according to claim 3, characterized in that it consists of a pump for supplying liquid to the liquid injection nozzle. A temperature sensor for measuring the temperature of the cooling air to be supplied and the exhaust gas temperature to be introduced is arranged, and a control mechanism for controlling the cooling fan and the liquid supply mechanism according to the value measured by the temperature sensor is provided. cooling apparatus of an exhaust gas according to claim 3 or 4, wherein to.

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