JP6058107B1 - Gas water washing device - Google Patents

Abstract

To provide a gas water rinsing apparatus capable of preventing a gas introduction part of a water washing tower for removing water-soluble components contained in exhaust gas from being blocked by precipitation of the water-soluble components. A water washing tower 20 that removes water-soluble components in a heat treatment gas by water washing, and a clog prevention device 30 that prevents clogging of a gas introduction part 25 that introduces exhaust gas into the water washing tower 20 are provided to prevent clogging. The apparatus 30 is a gas water washing apparatus 10 having a heating unit 33 that heats the heat treatment gas and a precipitate removing unit 36 that removes precipitates of water-soluble components. [Selection] Figure 2

Description

  The present invention relates to a gas water rinsing apparatus for rinsing exhaust gas discharged from a processing apparatus for fly ash collected in an exhaust gas line such as a waste incinerator or melting furnace to remove water-soluble components contained in the exhaust gas. .

  The exhaust gas discharged from the fly ash treatment apparatus contains a water-soluble component of ammonium salts that precipitates when processing at a temperature suitable for exhaust gas treatment. In order to remove this water-soluble component, the exhaust gas line is provided with a water washing tower for injecting water into the exhaust gas to dissolve and remove the water-soluble component in water.

JP 2001-232324 A

  However, when the exhaust gas is cooled in the exhaust gas line leading to the water washing tower, for example, ammonia gas and hydrogen chloride contained in the exhaust gas are combined to produce ammonium chloride, which is deposited near the gas introduction part of the water washing tower and gas There was a risk of blocking the inlet.

  Then, an object of this invention is to provide the gas washing apparatus which can prevent that the gas introduction part of a washing tower is obstruct | occluded by a deposit.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

That is, the gas water washing apparatus according to the present invention prevents clogging of a water washing tower that removes water-soluble components in exhaust gas generated by treating fly ash by water washing, and a gas introduction part that introduces exhaust gas into the water washing tower. A clogging prevention device, and an inspection port provided opposite to the opening of the gas introduction unit , wherein the clogging prevention device is a heating unit that heats exhaust gas, and a precipitate that removes precipitates of the water-soluble components. A deposit removing section, and provided in the gas introducing section and having one end connected to the water washing tower, the deposit removing section being provided in the gas introducing section and the introduction The introduction upstream pipe connected to the intermediate part of the downstream pipe is provided with the heating unit, and the inspection port is configured so that the opening of the gas introduction part or the inner wall surface of the introduction downstream pipe can be visually observed .

  According to the above configuration, the generation of precipitates of water-soluble components is generated by heating the exhaust gas on the wall surface of the heating unit in order to suppress the temperature decrease of the gas introduction unit due to the temperature decrease of the entire gas water rinsing device by rinsing in the rinsing tower. Can be prevented. Further, when a precipitate of a water-soluble component is generated as the temperature of the gas introduction part is lowered due to the water washing in the washing tower, the precipitate can be removed by the precipitate removing part. Thereby, obstruction | occlusion by the deposit of the gas introduction part of a washing tower can be prevented.

  According to the above configuration, generation of precipitates on the wall surface of the upstream inlet pipe heated by the heating unit is suppressed, and precipitates of the water-soluble components deposited and adhered to the downstream pipe by the precipitate removal unit are removed. The blockage of the gas introduction part of the washing tower can be effectively prevented.

  In the above-described configuration, the present invention has an injection nozzle that is installed at the other end portion of the introduction downstream pipe in the deposit removing portion and injects spray water toward the one end portion.

  According to the said structure, the deposit of a water-soluble component can be effectively removed with the injection water injected from an injection nozzle.

The present invention having the above structure, the closure prevention device, have a removal control unit for controlling at least one of the injection time and the injection interval of the injection water in the precipitate removal unit, the removal control unit, the gas The injection time and the injection interval are controlled based on the amount of precipitate deposited on the opening of the introduction part or the inner wall surface of the introduction downstream pipe .

  According to the said structure, obstruction | occlusion of the gas introduction part of a water-washing tower can be efficiently prevented by controlling at least one among the injection time and the injection space | interval in the deposit removal part by a removal control part.

  According to the present invention, it is possible to prevent the gas introduction part of the washing tower from being blocked by the precipitate of the water-soluble component contained in the exhaust gas.

It is the schematic which shows the structure of the fly ash heat processing equipment provided with the gas water washing apparatus which concerns on this invention. It is front sectional drawing of the gas water washing apparatus which concerns on this invention. It is a block diagram which shows the control system in the gas water washing apparatus which concerns on this invention.

  First, the fly ash heat treatment equipment 1 provided with the gas water washing apparatus 10 which concerns on this invention is demonstrated. In addition, the gas water washing apparatus 10 which concerns on this invention is not limited to what is provided in the fly ash heat processing equipment 1 demonstrated below, The exhaust gas discharged | emitted from a waste incinerator, a melting furnace, etc. is processed. It may be provided in the exhaust gas treatment facility.

  As shown in FIG. 1, the fly ash heat treatment equipment 1 decomposes dioxins by heat-treating fly ash collected in an exhaust gas line such as an incinerator (not shown) of the incineration equipment. The fly ash heat treatment equipment 1 is heated by a fly ash storage hopper 2 that stores fly ash, a heater 4 that heats the fly ash to a predetermined temperature (for example, 350 ° C. to 400 ° C.) and decomposes dioxins. The heat treatment gas (an example of “exhaust gas”) introduced through the exhaust gas introduction line 9 from the cooler 5 for cooling the fly ash and the dust filter 8 provided in the heater 4 is washed with water to obtain a water-soluble component. A water rinsing apparatus 10 for removing water, a condenser 6 for cooling the heat-treated gas washed by the gas water rinsing apparatus 10, and a drain tank 7 for receiving waste water that is discharged from the gas water rinsing apparatus 10 and the condenser 6 and into which water-soluble components are dissolved. And.

Next, the gas water washing apparatus 10 according to the present invention will be described with reference to FIG. 2. This gas water washing apparatus 10 removes water-soluble components such as hydrogen chloride and ammonia gas contained in the heat treatment gas by water washing. . When the temperature of the heat treatment gas discharged from the heater 4 is relatively low and is cooled in the exhaust gas introduction line 9, hydrogen chloride and ammonia gas contained in the heat treatment gas are combined to form an ammonium chloride salt. Is deposited. And this deposit adheres and solidifies on the pipe inner peripheral surface and inlet of the gas introduction part 25 of the water-washing tower 20, and blocks | blocks introduction of heat processing gas. Therefore, the gas water rinsing apparatus 10 includes a clogging prevention device 30 that prevents the introduction of the heat treatment gas in the gas water rinsing apparatus 10 from being clogged due to adhesion and solidification of the precipitate of the water-soluble component.

  That is, the gas water rinsing apparatus 10 includes a rinsing tower 20 for rinsing the heat treatment gas to remove water-soluble components, and a gas introduction portion 25 of the water rinsing tower 20 blocked by precipitates of water-soluble components precipitated from the heat treatment gas. And an occlusion prevention device 30 that prevents this from occurring.

  The flush tower 20 includes a cylindrical tower main body 20a arranged upright in the vertical direction. The washing tower 20 is provided in a washing water introduction part 21 having a watering nozzle 22 for spraying washing water downward from the upper end part of the tower body 20a, and a body part of the tower body 20a. Hydrogen chloride and ammonia gas contained in the heat treatment gas, provided at the lower end of the tower body 20a, with a filler layer 23 having a contact promoting filler (for example, Raschig ring or the like) that promotes contact and efficiently performs washing with water. A cleaning water discharge unit 24 that discharges cleaning water in which water-soluble components such as water are dissolved, and a gas introduction that introduces a heat treatment gas that is opened on the peripheral side surface at the lower end side higher than the cleaning water discharge unit 24 of the tower body 20a. And a gas discharge unit 26 that is provided at the upper end of the tower body 20a and discharges the heat-treated gas after washing with water.

  In the washing tower 20, washing water is evenly sprinkled in the tower main body 20a downward from the watering nozzle 22 by the washing water introduction section 21. This washing water forms a water film with the filler layer 23. Then, the heat treatment gas introduced into the tower main body 20 a from the gas introduction part 25 is sent upward as a counter flow of the washing water and passes through the filler layer 23. In the filler layer 23, the heat treatment gas and the water film formed on the filler layer 23 are effectively brought into contact, and the water-soluble component contained in the heat treatment gas is effectively dissolved in the cleaning water. Then, the washed heat treatment gas is discharged from the gas discharge unit 26. In addition, the cleaning water containing the water-soluble component is discharged from the cleaning water discharge unit 24.

  The clogging prevention device 30 includes an introduction downstream pipe 31 having one end connected to the gas introduction section 25, an introduction upstream pipe 32 connected to an intermediate portion of the introduction downstream pipe 31 and flowing the heat treatment gas to the introduction downstream pipe 31; A precipitate removing unit 36 provided in the introduction downstream pipe 31 and a heating unit 33 that heats the heat treatment gas passing through the introduction upstream pipe 32 are provided.

  The introduction downstream pipe 31 is a pipe connected from the gas introduction section 25 so as to protrude in the horizontal direction perpendicular to the axis of the column main body 20a, and an injection nozzle 37 constituting the precipitate removing section 36 is provided at the other end.

  The introduction upstream pipe 32 is a pipe that protrudes upward from the intermediate portion near the other end of the introduction downstream pipe 31 and extends in the vertical direction. Further, the exhaust upstream introduction pipe 9 is connected to the horizontally curved upper end via a flange portion. Is connected.

  The heating unit 33 includes an electric heater 34 that heats the introduction upstream pipe 32 and a thermometer 35 that measures the temperature of the introduction upstream pipe 32. The heater 34 a is wound around the outer peripheral wall of the introduction upstream pipe 32 of the electric heater 34. The electric heater 34 indirectly heats the heat treatment gas vented to the introduction upstream pipe 32 by heating the introduction upstream pipe 32 at a predetermined temperature (a temperature at which no precipitate is generated) by the heater portion 34a. The temperature of the heater portion 34 a of the electric heater 34 is monitored by a thermometer 35.

  The deposit removing unit 36 includes an injection nozzle 37 that ejects the spray water to remove the deposit, and a manual or electromagnetic on-off valve 38 that adjusts the jet of the spray water from the spray nozzle 37. The injection nozzle 37 is installed at the other end of the introduction downstream pipe 31 (the end opposite to the side connected to the gas introduction unit 25). In the injection nozzle 37, the injection port 37 a is provided toward one end of the introduction downstream pipe 31 (longitudinal direction of the introduction downstream pipe 31), and the injection water is supplied from the injection port 37 a to the inner peripheral wall of the introduction downstream pipe 31 and the gas introduction unit 25. It is injected toward the opening.

Next, the control system of the gas water rinsing apparatus 10 will be described with reference to FIG.
The operation of the gas water rinsing apparatus 10 is controlled by a controller 40 that is a removal controller. The controller 40 is a main part that controls the gas water rinsing apparatus 10. For example, the controller 40 is configured in a storage device such as a CPU, a memory, and a hard disk, and is controlled according to a control program (or data table) stored in the memory. Process.

  The controller 40 includes detection data of a thermometer 35 that detects the temperature of the heat treatment gas via the outer peripheral wall of the introduction upstream pipe 32, operation data of each device of the fly ash heat treatment facility 1, and inspections to be described later. Input data of the operation panel 41 operated by the operator according to the visual state from the mouth 27 is input. Then, the controller 40 controls the heating temperature of the introduction upstream pipe 32 via the operation part 34 b of the electric heater 34 based on the detection data of the thermometer 35. Further, based on the input signal of the operation panel 41, the timer 42 of the controller 40 is set, and the on-off valve 38 is operated via the on-off valve operating unit 39 to inject the injection time and the injection from the injection nozzle 37. Control at least one of the intervals.

  Here, the temperature and flow rate of the heat treatment gas detected by the thermometer 35 varies depending on the operating state of the fly ash heat treatment equipment 1, so the heating temperature by the electric heater 34 is controlled based on the detection data of the thermometer 35. To do.

Further, an operator adheres to the opening of the gas introduction part 25 or the inner wall surface of the introduction downstream pipe 31 from the inspection port 27 (FIG. 2) provided opposite to the opening of the gas introduction part 25 on the lower end side of the tower body 20 a. The amount of precipitation (precipitation state) is confirmed by visual observation, and is confirmed again after a predetermined time to detect the growth state. By inputting the growth state through the operation panel 41, the timer 42 is set in the controller 40. And at every predetermined time, the on-off valve 38 is operated via the on-off valve operation part 39, and at least one is controlled among the injection time of the injection water injected from the injection nozzle 37, and the injection space | interval.

  As described above, in the gas water rinsing apparatus 10, in order to introduce the heat treatment gas heated in the clogging prevention apparatus 30 into the water washing tower 20, the gas introduction unit 25 of the water washing tower 20 converts the water-soluble component from the heat treatment gas. Can be prevented from precipitating. Furthermore, even when a water-soluble component is precipitated from the heat treatment gas in the gas introduction part 25 of the water washing tower 20, the deposited water-soluble component can be removed by the precipitate removing part 36. Therefore, it is possible to prevent the gas introduction part 25 of the washing tower 20 from being blocked by the water-soluble component precipitated from the heat treatment gas.

  In the present embodiment, the exhaust gas washed by the gas flushing device 10 is a heat treatment gas generated from the fly ash treated in the heater 4 of the fly ash heat treatment equipment 1. The exhaust gas is not limited and may be any exhaust gas in which a water-soluble component is precipitated due to a decrease in temperature.

  Further, in the present embodiment, the heating unit 33 that heats the heat treatment gas is configured by the electric heater 34 that heats the introduction upstream pipe 32, but is not limited thereto. For example, as a jacket structure (double pipe) with an outer pipe on the outer periphery of the introduction upstream pipe 32, heat treatment gas is heated via the introduction upstream pipe 32 by flowing high temperature steam, high temperature gas, heating fluid, etc. It may be. Accordingly, any structure that can be heated at a predetermined temperature at which the precipitate of the water-soluble component contained in the heat treatment gas is not deposited may be used.

  Furthermore, in the present embodiment, the precipitate removing unit 36 that removes the precipitate of the water-soluble component is configured by the spray nozzle 37 that sprays the spray water, but is not limited thereto. Any structure that can remove the deposit deposited and solidified on the gas introduction section 25 or the introduction downstream pipe 31 may be used. For example, it may be constituted by a mechanical removal device that can extrude while rotating a hole saw-shaped blade to scrape deposits and extrude it from the introduction downstream pipe 31 through the opening of the gas introduction section 25 into the tower body 20a. I do not care.

  Further, in the present embodiment, the control of the spray time and spray interval of the spray water sprayed from the spray nozzle 37 is based on the deposition amount (precipitation state) of the water-soluble component visually observed from the inspection port 27. Although it is performed manually, the present invention is not limited to this. For example, as shown in FIG. 3, a gas introduction unit created by an imaging device 45 such as a camera with an illuminator provided near the gas introduction unit 25. The controller 40 calculates the precipitation amount (precipitation state) of the precipitate of the water-soluble component based on the 25 openings or the inner wall image or moving image of the introduction downstream pipe 31 and automatically based on the calculation result. The control may be performed. Further, the pressure of the first pressure gauge 46 provided at the inlet of the introduction upstream pipe 32 (pressure at the inlet of the introduction upstream pipe 32) and the pressure of the second pressure gauge 47 provided at the lower part of the flush tower 20 ( The control controller 40 may compare the pressure in the lower part of the water washing tower 20 and automatically perform the control based on the comparison result. Further, the controller 40 is water-soluble based on a detection signal from a sensor (indirect detector) 48 that detects a laser, an ultrasonic wave, or the like irradiated on the opening of the gas introduction section 25 or the inner wall surface of the introduction downstream pipe 31. It is also possible to calculate the precipitation amount (deposition state) of the component precipitates and automatically perform the control based on the calculation result.

DESCRIPTION OF SYMBOLS 4 Heater 10 Gas washing apparatus 20 Water washing tower 25 Gas introduction part 30 Blocking prevention apparatus 31 Introduction downstream pipe 32 Introduction upstream pipe 33 Heating part 36 Precipitate removal part 37 Injection nozzle 40 Control controller (removal control part)

Claims (3)

A water-washing tower that removes water-soluble components in exhaust gas generated by treating fly ash by water washing,
A clogging prevention device for preventing clogging of a gas introduction part for introducing exhaust gas into the washing tower,
An inspection port provided opposite to the opening of the gas introduction part;
With
The occlusion prevention device includes:
A heating unit for heating the exhaust gas;
A precipitate removing section for removing the precipitate of the water-soluble component;
Have
In the introduction downstream pipe provided at the gas introduction part and connected to one end of the washing tower, the precipitate removal part is provided,
The introduction upstream pipe provided in the gas introduction part and connected to the intermediate part of the introduction downstream pipe includes the heating unit,
The gas flushing device according to claim 1, wherein the inspection port is configured so that an opening of the gas introduction part or an inner wall surface of the introduction downstream pipe is visible . The gas water rinsing apparatus according to claim 1 , further comprising an injection nozzle that is installed at the other end portion of the introduction downstream pipe and injects the injection water toward the one end portion in the precipitate removing unit . The clogging prevention device has a removal control unit that controls at least one of the jetting time and jetting interval of the jet water in the deposit removing unit,
The said removal control part controls the said injection time and injection interval based on the precipitation amount of the deposit adhering to the opening of the said gas introduction part, or the inner wall face of the said introduction downstream pipe | tube. Item 3. A gas water washing apparatus according to Item 2.

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