KR100784138B1 - Device for preventing dew in coke dry quenching facilities - Google Patents

Abstract

An apparatus for preventing dew of a coke dry quenching system is provided to prevent dew formation in a pipe of a supply water heat exchanger by additionally forming an auxiliary passage for circulating circulation gas of a high temperature, and automatically prevent dew formation of the heat exchanger by automatically controlling a circulation gas switch valve according to temperature of the supply water heat exchanger. An apparatus for preventing dew formation of a coke dry quenching system comprises: a circulation gas passage(107) connected to a chamber(103) to form a moving path of circulation gas; a circulation fan(113) mounted on the circulation gas passage to withdraw circulation gas with a high temperature from the chamber; a boiler(110) mounted on the circulation gas passage between the chamber and the circulation fan to perform a heat exchange operation of circulation gas; a supply water heat exchanger(115) mounted on the circulation gas passage between the circulation fan and the chamber to perform a heat exchange operation of circulation gas flown in from the boiler; and a circulation gas supply control part that connects the boiler and the supply water heat exchanger to control a flow of circulation gas that is supplied from the boiler into the supply water heat exchanger.

Description

DEVICE FOR PREVENTING DEW IN COKE DRY QUENCHING FACILITIES}

1 is a view showing the configuration of a general coke dry fire extinguishing equipment.

2 is a view showing the condensation preventing device of the coke dry fire extinguishing system according to a first embodiment of the present invention.

3 is a view showing the condensation preventing device of the coke dry fire extinguishing system according to a second embodiment of the present invention.

4 is a view showing a condensation preventing device of the coke dry fire extinguishing system according to a third embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

110; Boiler 110a; An ammunition machine

115; Feed water heat exchanger 150; Secondary passage

152; Circulating gas opening and closing control valve 154; Temperature detector

156; Control

The present invention relates to a coke dry fire extinguishing system, and more particularly, to a condensation preventing device of a coke dry fire extinguishing system.

Typically, the coal charged into the carbonization chamber of the coke oven is coagulated by coagulation for a certain time. Coke Coke is extracted from a carbonization chamber, and after extraction, it is digested in a coke dry extinguishing system using an inert circulating gas (nitrogen) in a COKE DRY QUENCHING FACILITIES (commonly referred to as CDQ).

The coke dry fire extinguishing facility is a waste heat recovery facility that produces steam and electric power from a power plant using waste heat generated during extinguishing.

1 is a schematic diagram showing the overall process of a typical coke dry fire extinguishing system.

Referring to FIG. 1, the coke dry fire extinguishing facility uses a waste heat generated from the chamber 103 during cold coking of the red coke 101 extruded from the coke oven to start the boiler 110 and steam by Steam) A facility that produces power generated.

At the start of the coke dry fire extinguishing system, the circulation fan 113 is started to circulate the circulating gas 108 to cool the coke 101. However, the first circulating gas 108 passes through the feedwater heat exchanger 115 and causes the pipe surface in the feedwater heat exchanger 115 to fall below 120 degrees. Then, condensation occurs on the pipe surface in the feedwater heat exchanger 115 so that dust in the circulating gas 108 adheres to the pipe surface. As a result, the thermal efficiency of the pipe drops sharply.

If the circulation fan 113 is driven during the initial start-up of the coke dry fire extinguishing system, the temperature of the feedwater heat exchanger 115 drops below 120 degrees and gradually rises in temperature. There is no way. However, the rotation of the circulation fan 113 waited only for the temperature of the feedwater heat exchanger 115 to rise.

It is an object of the present invention to provide a condensation preventing device of a coke dry fire extinguishing system capable of supplying high temperature circulating gas to a feedwater heat exchanger to prevent condensation of pipes of the feedwater heat exchanger.

In order to achieve the above object, the present invention provides a coke dry fire extinguishing system, a circulation gas passage connected to the chamber to form a movement path of the circulating gas, a circulation gas passage mounted to the circulation gas passage to withdraw the high temperature circulating gas from the chamber Boiler mounted between the chamber and the circulating fan in the circulating gas passage to exchange heat for the circulating gas, water supply heat exchanger mounted between the circulating fan and the chamber in the circulating gas passage and heat-exchanging the circulating gas from the boiler, boiler and feed water It includes a circulating gas supply control unit for connecting the heat exchanger to regulate the flow of the circulating gas supplied from the boiler to the feed water heat exchanger.

In the above configuration, the circulating gas supply control unit may include an auxiliary passage connecting the boiler and the water supply heat exchanger, and a circulating gas opening and closing control valve mounted on the auxiliary passage to adjust the flow of the circulating gas according to the opening and closing amount.

And it is mounted on one side of the water supply heat exchanger and the temperature detection unit for detecting the temperature in the water supply heat exchanger to generate a corresponding temperature detection signal, the temperature detection signal input from the temperature detection unit analyzes the circulating gas opening and closing according to the internal temperature of the water supply heat exchanger It may further include a control unit for performing a control operation for adjusting the opening and closing amount of the control valve.

In the above configuration, when the temperature detection signal is input from the temperature detector, the controller compares the current temperature of the feedwater heat exchanger with the temperature of the set feedwater heat exchanger, and the temperature of the feedwater heat exchanger in which the current temperature of the feedwater heat exchanger input from the temperature detector is set. If less than or equal to the driving signal to the circulating gas opening and closing control valve can be operated to open the circulating gas opening and closing control valve.

Here, the temperature of the circulating gas flowing into the feed water heat exchanger from the boiler through the auxiliary passage may be 250 degrees to 300 degrees.

In addition, the circulating gas flowing from the boiler to the feed water heat exchanger through the auxiliary passage may be made of the circulating gas before passing through the coal blower constituting the boiler.

On the other hand, the auxiliary passage may further include an auxiliary circulation fan for supplying the circulating gas of the boiler to the feed water heat exchanger.

The auxiliary circulation fan may be mounted between the circulating gas open / close control valve and the feed water heat exchanger.

A temperature detecting unit installed at one side of the water supply heat exchanger and detecting a temperature in the water supply heat exchanger to generate a corresponding temperature detection signal, and analyzing a temperature detection signal input from the temperature detection unit. The controller may further include a driving control unit.

In the above configuration, when the temperature detection signal is input from the temperature detector, the controller compares the current temperature of the feedwater heat exchanger with the temperature of the set feedwater heat exchanger, and the temperature of the feedwater heat exchanger in which the current temperature of the feedwater heat exchanger input from the temperature detector is set. If it is less than or equal to the auxiliary circulation fan it can be supplied to the drive control signal to drive the auxiliary circulation fan.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

2 is a view showing the condensation preventing device of the coke dry fire extinguishing system according to a first embodiment of the present invention.

Referring to FIG. 2, the coke dry fire extinguishing system 100 includes a chamber 103, a circulating gas passage 107, a circulation fan 113, a boiler 110, a dust catcher 121, and a dust cyclone 112. ), A feed water heat exchanger 115, a circulating gas supply control unit.

The chamber 103 is formed in a cylindrical structure into which the glowing coke 101 is charged.

The circulating gas passage 107 is connected to the upper portion of the chamber 103 to guide the hot circulating gas flow.

The circulation fan 113 is connected to the circulation gas passage 107 to withdraw the high temperature circulating gas from the chamber 103 to circulate through the circulation gas passage 107.

The boiler 110 is mounted between the chamber 103 and the circulation fan 113 in the circulation gas passage 107 to produce superheated steam through heat exchange from the high temperature circulating gas drawn from the chamber 103.

The dust catcher 121 is installed at one side of the circulating gas passage 107 to remove dust coke and dust containing the circulating gas from the circulating gas.

The multi-cyclone 112 is a secondary dust collector.

The feedwater heat exchanger 115 is a device installed between the circulation fan 113 and the chamber 103 in the circulating gas passage 107 to finally heat exchange the circulating gas flowing from the boiler 110.

Here, when charging or discharging the red coke 101 into the chamber 103, which is the main body, there is a fluctuation in the pressure inside the chamber 103. When the pressure is excessive, the flame is ejected to the outside and the pressure is negative. Since the explosion phenomenon occurs in the interior of the chamber 103 is to be maintained properly to maintain a stable operation.

Accordingly, in the coke dry fire extinguishing system according to the first embodiment of the present invention, a pipe is formed on a part of the circulating gas passage 107 to maintain a constant pressure in the chamber 103, thereby externally supplying a gas having a temperature of 120 ° C. or higher. Pressure control unit to discharge to the installation is installed.

The pressure control unit includes a kitchen outlet pipe 140 in which the pressure control valve 141 is controlled and operated by the controller at any time, and the control valve 143 is manually operated in consideration of the inoperable state of the pressure control valve 141. Is further provided with a preliminary discharge pipe 142 is installed is to enable stable equipment operation.

The preliminary discharge pipe 142 operates while the control valve 143 is closed during normal operation, but when the pressure control valve 141 is not operated, the preliminary discharge pipe 142 is manually opened to release high temperature gas to the outside. It will work to discharge.

However, based on the pressure control valve 141 installed in the preliminary pressure control preliminary discharge tube 142, if the gas temperature in front of the preliminary discharge tube 142 is 120 ° C or higher and the temperature in the rear end is lower than this, the thermal conduction Condensation may occur in a pipe having a higher temperature than the outside due to a temperature difference between air that has become higher than the atmospheric temperature and has stagnated inside the pipe.

Condensation occurs seasonally, but as it continues, condensate accumulates on the top of the valve, and the condensate reacts with the gas to acidify to corrode the pipeline and valve to form scale. These scales accumulate and interfere with the operation of the valve, thus failing to perform the role of preliminary pressure adjustment in an emergency, and in severe cases, cause explosion of the chamber 103 and boiler 110 equipment.

The circulating gas supply control unit according to the first embodiment of the present invention connects the boiler 110 and the feedwater heat exchanger 115 to control the flow of the circulating gas supplied from the boiler 110 to the feedwater heat exchanger 115 to condensation. To prevent.

The circulating gas supply control unit includes an auxiliary passage 150 and a circulating gas open / close control valve 152.

The auxiliary passage 150 is configured separately from the circulating gas passage 107 and is a pipe connecting the boiler 110 and the feed water heat exchanger 115.

The circulating gas open / close control valve 152 is mounted in the auxiliary passage 150 to adjust the flow of the circulating gas according to the opening and closing amount.

On the other hand, the circulating gas supply control unit according to the first embodiment of the present invention may further include a temperature detector 154 and the controller 156 to automate the opening and closing operation of the circulating gas opening and closing control valve 152.

The temperature detector 154 is a temperature sensor mounted on one side of the feedwater heat exchanger 115 and detecting a temperature in the feedwater heat exchanger 115 to generate a corresponding temperature detection signal.

The controller 156 performs an overall control operation related to the circulation gas supply regulation of the present invention, and may be configured as a kind of microprocessor. The controller 156 analyzes the temperature detection signal input from the temperature detector 154 to perform a control operation of adjusting the opening / closing amount of the circulating gas open / close control valve 152 according to the internal temperature of the feedwater heat exchanger 115.

For example, when a temperature detection signal is input from the temperature detector 154, the controller 156 compares the current temperature of the feedwater heat exchanger 115 with the temperature of the set feedwater heat exchanger 115, and from the temperature detector 154. When the current temperature of the input water supply heat exchanger 115 is less than or equal to the temperature of the set water supply heat exchanger 115, a driving signal is supplied to the circulating gas open / close control valve 152 to open and operate the circulating gas open / close control valve 152.

Here, the temperature of the circulating gas flowing into the feed water heat exchanger 115 from the boiler 110 through the auxiliary passage 150 is 200 to 300 degrees (preferably 250 to 300 degrees). If the temperature of the circulating gas exceeds 300 degrees may affect the durability of the feed water heat exchanger 115, if the temperature of the circulating gas is less than 200 degrees, it is difficult to compensate for the temperature of the cooled feed water heat exchanger 115 have. For this reason, the circulating gas introduced from the boiler 110 to the feedwater heat exchanger 115 through the auxiliary passage 150 may be made of the circulating gas before passing through the coal blower 110a constituting the boiler 110. have.

With the above-described configuration, the first embodiment of the present invention is to supply the circulating gas to the feed water heat exchanger 115 through the auxiliary passage 150 to the high temperature circulating gas that does not pass through the cut mill 110a constituting the boiler 110. Sending compensates for the cooled temperature of feedwater heat exchanger 115. When the temperature of the feedwater heat exchanger 115 decreases, the circulating gas open / close control valve 152 is opened to compensate the temperature of the feedwater heat exchanger 115 to prevent condensation in the water supply heat exchanger 115. do. Therefore, the dust in the circulating gas is prevented from adhering to the pipe surface in the feedwater heat exchanger 115.

With reference to Figure 2 will be described the condensation prevention operation of the coke dry fire extinguishing system according to a first embodiment of the present invention.

First, the hot coke 101 of the high temperature (about 1000 degreeC) which dry-drying was completed in the coke oven is extracted to the basket 102 of a fire truck in the carbonization chamber of a coke oven. The extracted red coke 101 is charged by the crane into the chamber 103 of the upright cylindrical structure. At this time, the high temperature circulating gas is withdrawn from the chamber 103 by the circulation fan 113 which is always operating in a coke dry fire extinguishing system. The circulated gas withdrawn is passed through the feedwater heat exchanger 115 and then the blasting device 104 located at the lower side of the chamber 103 at a set temperature and pressure (temperature of about 120 ° C. and pressure of +830 mmAq). Through the chamber 103. The coke 101 is gradually cooled by the flow of the circulating gas. In the lower portion of the chamber 103, the coke cooled down from the chamber 103 is drawn out to the belt conveyor 106 through the rotary valve 105 and transported to the outside.

In this process, the high-temperature circulating gas recovered while cooling the coke 101 in the chamber 103 is introduced into the boiler 110 at a temperature of about 980 ° C. and a pressure of −90 mm Aq through the circulating gas passage 107. Moved to the heat exchange is made in the boiler (110).

And, the superheated steam produced in the boiler 110 is sent to the power generation turbine 119 of the power generation facility 130 is started, it is made of a process for producing power through the generator 120. In this process, the circulating gas must be maintained at a constant temperature and flow rate at all times to enable smooth operation of the power plant 130 as well as the coke dry fire extinguishing facility.

In addition, in order to remove dust coke and dust contained in the circulating gas from one side of the circulating gas, a dust catcher 121 of gravity sedimentation type is provided on one side of the circulating gas passage 107 to collect the powder coke and dust. do. Thereafter, the high temperature circulating gas is passed through the boiler 110 which is a heat exchanger to exchange heat. And dust is removed from the multi-cyclone 112, the secondary dust collecting device.

In this way, the clean circulating gas from which the coke and the dust have been removed is moved to the circulation fan 113, and the remaining heat is exchanged again by the feedwater heat exchanger 115. Subsequently, circulation is continued while continuously supplying the circulating gas into the chamber 103 at a temperature of 120 ° C. and a pressure of +830 mmAq.

On the other hand, the coke dry fire extinguishing facility is operated by a pressure control unit to maintain a constant pressure in the chamber 103, the pressure control valve 141 is operated by the controller to control the high temperature circulating gas to the kitchen outlet pipe 140 Through the outside.

The water supply heat exchanger 115 is provided with a temperature detector 154 to detect the temperature of the water supply heat exchanger 115 in real time to supply a signal to the controller 156.

When the temperature detection signal is input from the temperature detector 154, the controller 156 analyzes the temperature detection signal input from the temperature detector 154 to determine the current temperature of the feedwater heat exchanger 115 and the temperature of the set feedwater heat exchanger 115. Compare (121 degrees). If the current temperature of the feedwater heat exchanger 115 input from the temperature detector 154 is equal to or lower than the set temperature of the feedwater heat exchanger 115 (121 degrees), the controller 156 opens and closes the circulating gas installed in the auxiliary passage 150. By supplying a driving signal to the control valve 152 performs a condensation prevention control operation to open the circulating gas opening and closing control valve 152.

As the circulating gas open / close control valve 152 is opened, the circulating gas at an appropriate temperature (about 250 degrees to 300 degrees) is introduced into the feedwater heat exchanger 115 through the auxiliary passage 150. That is, the front end of the cut mill 110a constituting the boiler 110 and the feedwater heat exchanger 115 are connected to the auxiliary passage 150 so that the circulating gas having a higher temperature than that of the feedwater heat exchanger 115 has the auxiliary passage 150. Through the feed water heat exchanger (115). In this operation, dew can be prevented from forming in the pipe in the feedwater heat exchanger 115.

On the other hand, the detailed description of the present invention has been described with reference to specific embodiments, of course, various modifications are possible without departing from the scope of the invention.

In the above-described embodiment, the auxiliary gas 150 has been described in which the circulating gas opening and closing control valve 152 is mounted. However, those skilled in the art may improve the above-described configuration.

For example, as shown in FIG. 3, the auxiliary circulation fan 160 may further include an auxiliary circulation fan 160 installed in the auxiliary passage 150 to supply the circulating gas of the boiler 110 to the feed water heat exchanger 115.

In the above configuration, when the temperature detection signal is input from the temperature detector 154, the controller 156 compares the current temperature of the feedwater heat exchanger 115 with the temperature of the set feedwater heat exchanger 115, and from the temperature detector 154. When the current temperature of the input water supply heat exchanger 115 is less than or equal to the temperature of the set water supply heat exchanger 115, a driving control signal may be supplied to the auxiliary circulation fan 160 to drive the auxiliary circulation fan.

The auxiliary circulation fan 160 may be mounted in the auxiliary passage 150 separately from the circulating gas opening and closing control valve 152, and the auxiliary passage 150 together with the circulating gas opening and closing control valve 152 is illustrated in FIG. 4. It can also be mounted on. In this case, the auxiliary circulation fan 160 may be mounted between the circulation gas opening and closing control valve 152 and the feed water heat exchanger 115.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the claims below but also by the equivalents of the claims.

As described above, the condensation preventing device of the coke dry fire extinguishing system according to the present invention prevents the condensation of the water supply heat exchanger by condensing the boiler and the water supply heat exchanger by separately forming an auxiliary passage for circulating high temperature circulating gas. can do.

In addition, the configuration of the temperature detector and the control unit automatically controls the opening and closing of the circulating gas open / close control valve according to the temperature of the water supply heat exchanger, thereby having an effect of automating the condensation prevention configuration of the air supply heat exchanger.

In addition, the configuration of the auxiliary circulation fan can increase the inflow rate of the circulating gas flowing into the feed water heat exchanger from the boiler, there is an effect that can quickly compensate the temperature of the cooled feed water heat exchanger.

Claims (10)

In the coke dry fire extinguishing system, A circulation gas passage connected to the chamber to form a movement path of the circulation gas; A circulation fan mounted in the circulation gas passage to draw hot circulating gas from the chamber; A boiler mounted between the chamber and the circulation fan in the circulation gas passage to heat exchange the circulation gas; A water supply heat exchanger mounted between the circulation fan and the chamber in the circulation gas passage and heat-exchanging the circulation gas flowing from the boiler; And a circulating gas supply control unit for connecting the boiler and the feed water heat exchanger to regulate a flow of circulating gas supplied from the boiler to the feed water heat exchanger. The method of claim 1, The circulating gas supply control unit An auxiliary passage connecting the boiler and the feed water heat exchanger; Condensation prevention device of the coke dry fire extinguishing system comprising a circulating gas opening and closing control valve mounted to the auxiliary passage to control the flow of the circulating gas in accordance with the opening and closing amount. The method of claim 2, A temperature detector mounted on one side of the feedwater heat exchanger to detect a temperature in the feedwater heat exchanger and generate a corresponding temperature detection signal; Condensation prevention of the coke dry fire extinguishing system further comprises a control unit for analyzing the temperature detection signal input from the temperature detection unit to perform a control operation for controlling the opening and closing amount of the circulating gas opening and closing control valve according to the internal temperature of the water supply heat exchanger. Device. The method of claim 3, When the temperature detection signal is input from the temperature detector, the controller compares the current temperature of the feedwater heat exchanger with the temperature of the set feedwater heat exchanger, and the temperature of the feedwater heat exchanger in which the current temperature of the feedwater heat exchanger input from the temperature detector is set. The condensation prevention apparatus of the coke dry type fire-extinguishing system which supplies a drive signal to the said circulating gas open / close control valve, and opens it. The method of claim 4, wherein Temperature of the circulating gas flowing from the boiler to the feed water heat exchanger through the auxiliary passage is 250 degrees to 300 degrees condensation preventing device of the coke dry fire extinguishing system. The method of claim 4, wherein The condensation prevention device of the coke dry fire extinguishing system which consists of the circulating gas before passing through the coal blower which comprises the said boiler through the said auxiliary passage to the said feed water heat exchanger from the said boiler. The method of claim 2, And an auxiliary circulation fan mounted to the auxiliary passage to supply the circulating gas of the boiler to the feed water heat exchanger. The method of claim 7, wherein The auxiliary circulation fan is a condensation preventing device of the coke dry fire extinguishing system is mounted between the circulating gas opening and closing control valve and the water supply heat exchanger. The method of claim 7, wherein A temperature detector mounted on one side of the feedwater heat exchanger to detect a temperature in the feedwater heat exchanger and generate a corresponding temperature detection signal; And a controller configured to analyze the temperature detection signal input from the temperature detector and to control driving of the auxiliary circulation fan according to the internal temperature of the feedwater heat exchanger. The method of claim 9, When the temperature detection signal is input from the temperature detector, the controller compares the current temperature of the feedwater heat exchanger with the temperature of the set feedwater heat exchanger. The condensation prevention apparatus of the coke dry type fire-extinguishing system which supplies a drive control signal to the said auxiliary circulation fan, and drives the said auxiliary circulation fan if it is below.

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