KR100650602B1 - Drain passage variation type regenerator by discharging gas temperature - Google Patents

Abstract

A heat storage having variable discharge paths according to temperature of exhaust gas is provided to reduce low-temperature corrosion caused by low temperature of exhaust gas by changing an exhaust gas path in the heat storage according to temperature of the rear end of the heat storage. A heat storage having variable discharge paths according to temperature of exhaust gas comprises a housing(1); a heat storing body(4) inserted into the housing; a chamber installed at the lower side of the heat storing body; plural buffering chambers(8a,8b,8c) divided of the chamber by partition walls(W1,W2); plural pipes(9a,9b,9c) installed at the outer side of the housing to a corresponding number to the buffering chambers; blocking valves(10a,10b) installed on the rest pipes except at least one pipe; a main pipe(11) connecting the pipes as one; a switch valve(12) installed on the main pipe; a control unit connected with the blocking valve and the switch valve to automatically regulate opening degree; and a temperature sensor installed at the rear end of a discharge port of the main pipe to transmit/receive signals with the control unit.

Description

DRAIN PASSAGE VARIATION TYPE REGENERATOR BY DISCHARGING GAS TEMPERATURE}

1 is a schematic configuration diagram showing the shape of a heat storage device according to the prior art,

Figure 2 is a schematic diagram showing the shape of the heat accumulator according to the present invention.

♧ description of the symbols for the main parts of the drawing ♧

1..Housing 2,3 ... screen

4 .... Regenerator 5 .... Burner Inlet

8a, b, c .... buffer chamber 9a, b, c ..

10a, b..isolating valve 11 .... main piping

12 ... switching valve

The present invention relates to a heat accumulator, and more particularly, according to an improved exhaust gas discharge temperature so as to prevent low-temperature corrosion by lowering the exhaust gas by varying the flow path of air and the exhaust gas according to the exhaust gas discharge temperature of the heat accumulator. It relates to a flow path variable heat storage device.

Regenerators that directly recover exhaust gas arrays from regenerative burners or regenerative combustion systems are very important.

As a heat storage body used for such a heat storage device, a spherical heat storage body or a honeycomb heat storage body is usually used.

In particular, in a heat storage device using a spherical heat storage body, the heat storage body 4 is inserted into a rectangular housing 1 having a relatively wide bottom surface as shown in FIG. 1, and the housing ( 1) Screens 2 and 3 are provided inside.

Thus, the high-temperature exhaust gas is introduced through the burner inlet 5 and then cooled through the space in which the heat accumulators 4 are layered, and then pressure stability and temperature uniformity are achieved through the empty chamber 8. After being discharged to the stack (Stack) through the switching valve (6).

On the other hand, the air is introduced into the chamber 8 through the switching valve 6 and then dispersed in the heat accumulator 4 layer, and then supplied to the burner (not shown) through the burner inlet 5.

In this process, the operator checks the state of the heat accumulator 4 through the heat accumulator observation door 7, and the exhaust gas and the air are stirred and supplied to each other.

At this time, since the upper side of the housing 1 adjacent to the burner inlet 5 is a high temperature region, heat insulation is required, but the lower side does not need to be insulated because the high temperature is less affected.

These heat accumulators are usually designed for the heat flow conditions under normal combustion loads, but they are not operated only at the same combustion loads when operating burners, but the combustion loads are within 40% of the rated load depending on the type of material to be heated, the loading amount and the heating conditions. Frequently it is necessary to drive in.

However, since the conventional heat accumulator is not designed to cope with problems that may occur in low load operation, low temperature corrosion due to the low temperature of the exhaust gas has reached a serious level.

That is, pipe oxidation due to water condensation in flue gas generated due to lower exhaust gas discharge temperature during low load operation (usually less than 200 ℃), and pipe corrosion due to sulfuric acid generated by condensation of moisture and sulfur components (usually called 'cold corrosion'). The condensation of ash in saturated steam condition is attached to the inside of the pipe, which leads to a change in the cross-sectional area of the pipe and the porosity in the regenerator, resulting in disturbance of supply / exhaust of air / exhaust gas as well as an increase in pressure loss. This will cause difficulties in normal system operation.

The present invention has been made in view of the above-mentioned problems of the prior art, and has been created to solve this problem. By reducing the exhaust gas flow rate inside the heat accumulator according to the rear end temperature of the heat accumulator, the low temperature corrosion phenomenon due to the low temperature of the exhaust gas is reduced. The main purpose is to provide a flow path variable heat accumulator according to exhaust gas discharge temperature.

The present invention provides a plurality of buffers in which a chamber is divided by a partition in a heat storage device having a housing, a heat storage body loaded therein, and a chamber provided under the heat storage body, in order to achieve the above technical problem. A chamber; A plurality of pipes having a number corresponding to the buffer chamber and installed outside the housing; A shutoff valve installed on the remaining pipe except at least one of the pipes; A main pipe connecting the pipes together; A switching valve installed on the main pipe; A control unit connected to the shutoff valve and the switching valve and automatically controlling the opening and closing thereof; The technical feature of the present invention is to provide a variable heat accumulator according to the exhaust gas discharge temperature is configured to include a temperature sensor installed in the rear end of the main pipe and communicated with the controller.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment according to the present invention.

2 is a schematic diagram showing the shape of a heat storage device according to the present invention.

As shown in FIG. 2, the heat storage device of the present invention divides the existing chamber ('8' of FIG. 1) into a plurality of compartments and divides the first, second, and third buffer chambers 8a, 8b, and 8c into and connects them. The first, second, and third pipes 9a, 9b, and 9c are arranged so that they can be connected to one main pipe 11 for control.

At this time, the first, second, and third buffer chambers 8a, 8b, and 8c are divided by the first and second partitions W1 and W2.

In addition, the first, second, and third buffer chambers 8a, 8b, and 8c may be divided into the same size, and may be configured by varying the volume (size) of each buffer chamber according to the heat storage installation environment. Of course.

The first and second shutoff valves 10a and 10b are installed in the first and second pipes 9a, 9b and 9c, and the switching valve 12 is installed in the main pipe 11.

In addition, the first and second shut-off valve (10a, 10b) and the switching valve 12 is preferably a solenoid valve capable of automatic opening and closing control.

In this case, the reason why only two shutoff valves are installed is because one of the three pipes should always supply air and discharge exhaust gas.

In addition, the number of pipes and shut-off valves including the divided number of buffer chambers may be variously changed according to the capacity of the heat storage device, the installation location, the object to be treated, etc. In the embodiment of the present invention, three buffer chambers, three pipes, and two The two shutoff valves will be described as an example.

On the other hand, a temperature sensor (not shown) is provided to measure the exhaust gas temperature of the heat accumulator, the temperature sensor is installed in the rear end of the main pipe 12 to measure the temperature of the exhaust gas, for example, PLC (Programmable The controller is configured to transmit measurement information to a controller (not shown) such as a logic controller or a microprocessor.

In addition, the controller is electrically connected to the first and second shut-off valves 10a and 10b and the switching valve 12 to control the opening and closing of these valves.

In addition, the heat accumulator 4 to be loaded into the housing 1, the screen (2, 3) and the burner inlet (5) for accommodating the same has the same configuration as before, and will be described using the same reference numerals. Shall be.

The operating relationship of the present invention made of such a configuration is as follows.

First, in the low load operation, the first and second shutoff valves 10a and 10b are all closed to control the supply of air / exhaust gas using only one third pipe 9c.

When the combustion load increases during this operation, the flow rate of air / exhaust gas increases, and when the exhaust gas discharge temperature of the lower heat accumulator detected by the temperature sensor becomes higher than 200 ° C., the control unit controls the first and second shut-off valves 10a and 10b. By opening any one of the heat accumulator (4) to cause the heat transfer to be controlled to lower the exhaust gas discharge temperature.

Thereafter, when the combustion load is further increased and the exhaust gas discharge temperature is increased to 250 ° C. or more, the controller controls all the remaining excess shutoff valves to be opened to correspond to the exhaust gas discharge temperature.

Through this process, when the combustion load gradually decreases and the exhaust gas discharge temperature is lower than the acid dew point, the amount of heat storage body 4 which is operated by closing one of the first and second shut-off valves 10a and 10b is reduced to reduce the exhaust gas discharge temperature. To increase it.

In this process, the control unit operates the regenerative burner through the feedback control according to the set temperature so that the control unit can actively operate in response to the fluctuation of the combustion load.

As described in detail above, the present invention by varying the area of the heat storage body used according to the combustion load to uniform the exhaust gas discharge temperature to prevent pipe corrosion due to moisture condensation, low temperature corrosion by sulfur components, deformation of the screen and By minimizing the damage and deterioration of equipment, it prolongs the service life of the equipment and prevents the pressure loss, thus providing excellent effect of suppressing flow disturbance.

Claims (3)

In a heat storage device having a housing, a heat storage body charged therein and a chamber provided below the heat storage body, A plurality of buffer chambers formed by dividing the chamber by partition walls; A plurality of pipes having a number corresponding to the buffer chamber and installed outside the housing; A shutoff valve installed on the remaining pipe except at least one of the pipes; A main pipe connecting the pipes together; A switching valve installed on the main pipe; A control unit connected to the shutoff valve and the switching valve and automatically controlling the opening and closing thereof; A discharge flow path variable heat accumulator according to the exhaust gas discharge temperature, characterized in that it comprises a temperature sensor installed in the rear end of the main pipe and installed in communication with the control unit. The method of claim 1, wherein the buffer chamber, Emission path variable heat storage according to the exhaust gas discharge temperature, characterized in that evenly or arbitrarily divided. The method according to claim 1, The shutoff valve and the switching valve, A variable heat accumulator according to the exhaust gas discharge temperature characterized in that the solenoid valve is automatically opened and closed.

Images