JPS60119433A - Smoke diffusion model testing device - Google Patents

Abstract

PURPOSE:To grasp qualitatively an exhaust gas diffusion state in a space by exhausting a reaction gas from a topographical model, and observing a color change state of a discoloring reagent-applied tape placed on the upper face of the topographical model. CONSTITUTION:A topographical model 4 is set to a prescribed wind direction by rotating a rotary plate 5. A discoloring reagent is impregnated into a tape 21 stuck to the upper face of the topographical model 4, and a mixed gas having a quality for discoloring this discoloring reagent is exhausted into a measuring drum 1 from a chimney model 2 through a path 19. This mixed gas is diffused by a wind made by controlling a revolving speed of a fan 14 and a turning state of an air current control device 15 so as to obtain a prescribed air current condition. When the diffused gas contacts the tape 21, the tape 21 becomes discolored, therefore, a diffusion state on the ground of the mixed gas exhausted from the chimney model 2 can be known with the naked eye or by a recording means.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for qualitatively testing, using a model, the situation in which gases emitted from chimneys and buildings are diffused in space.

In recent years, with the development of industry, preventing air pollution from exhaust gases emitted from power plants, chemical factories, etc. has become a pressing issue. In order to establish such popular pollution countermeasures, it is necessary to qualitatively understand the popularity and ground surface diffusion status of these polluted exhaust gases, and choose the most effective and economical chimney installation location according to location conditions, scale, etc. 7 data that determines the height, exhaust gas discharge speed, etc. I need to do it.

As a means of gathering such data, calculation methods,
There are two methods: on-site testing and model testing.

As a calculation method, Sasoton (S u 1. t
On) theoretical formulas, board formulas, and the British Met Office's empirical formulas have been published, but none of them take into account the influence of topography. In addition, there have recently been cases in which the effects of topography on these equations have been determined by numerical M analysis using a computer, but both require experimental verification.

The method used for field testing can only be tested after the actual chimney has been constructed, and conducting tests in a wide area with complex topography would be extremely costly and labor intensive. Moreover, it is difficult to freely select the chimney height, wind direction, etc., and data can only be obtained at the - point.

As for tests using models, it has not been possible to discharge gas from a chimney model and observe the diffusion of the gas with the naked eye. This is especially near impossible when the terrain is complex.

Furthermore, with conventional airflow control devices, it has been impossible to exhibit airflow characteristics with a relatively large degree of turbulence within the terrain model range.

Furthermore, if we were to try to understand the state of dispersion on the ground in various wind directions, we would need topographical models for each wind direction, which would require an enormous amount of work and effort.

This invention was provided in order to eliminate the shortcomings of conventional model testing equipment such as those described above, and to qualitatively grasp the exhaust gas diffusion situation in a space with the naked eye or with records. 1. A topographical model placed in the measurement barrel of the wind tunnel, a rotary plate supporting the topographical model, a rotatable plate-shaped airflow control device placed upstream of the topographical model, and a A smoke dispersion mechanism that includes a discharge mechanism for discharging a reactive gas, and a tape coated with a chemical that changes color and reacts with the gas discharged from the discharge mechanism, which is placed on the plane of the topographic model. This is a model test wind tunnel.

The present invention will be explained below with reference to embodiments shown in the drawings.

Figures 1, 2, and 3 are diagrams of the shrine, and 1 in each figure shows the measurement cylinder surrounded by transparent walls and ceiling.

2.3 and 04 are so-called topographical models such as chimneys, structures, and topography, which are coated with water-resistant and chemical-resistant paint, respectively.
5 is a rotating plate arranged on the wind tunnel floor 7, and a chimney model 2. It supports a house model 3 and a terrain model 4. In addition, this rotary plate 5! It is located downwind of the airflow control device 15 marked &. 6 is a hair ring for operating the rotating plate; 8 is a rotating shaft attached to the bottom surface of the rotating +125; 9. 10 is a pulley,]
1 is a drive source (motor) that prevents rotation of the rotating shaft 8, 12 is a controller for the driving source 11, and 13 is a driving source for transmitting power from the rotating shaft 8 to the rotating shaft 8.

14 is a fan that blows air into the measurement cylinder 1, and 15 and 16 are airflow control members for reproducing actual airflow conditions with a high degree of turbulence, and these may be arranged horizontally throughout the flow path. Reference numeral 15 denotes a rotatable airflow control device in the form of a rotatable hole plate arranged vertically throughout the flow path in the measurement barrel 1, and includes a wing-shaped diaphragm 15-.
1 has a plurality of slits. 15-2 is a reinforcing disk to which the diaphragm 15-1 is attached, and is attached to the upper and lower parts of the diaphragm 151. 15-3 is the diaphragm 15
-1 is a rotating shaft, and 15-4 is a bearing that supports the diaphragm co-rotating shaft 15-3. ] 5-5 is a guide plate for the reinforcing disk 15-2, +5-6 is a worm boiler, 15-7 is a pulse motor, 15-8 is a controller, ] 5-9 is a signal cable. +5-]0 indicates that the diaphragm 15-1 is swinging.

The airflow control material 16 is a plate placed on the floor surface 7 of the measurement cylinder, and is attached horizontally to the floor surface so as to be perpendicular to the wind.

Reference numeral 17 denotes a horn for storing gas that has been adjusted and mixed to a predetermined gas concentration; 18 and 19 are mixed gas flow rates G1 and mixed gas passages; 20 is a flow rate adjustment valve that adjusts the amount of mixed gas from the horn 17; A discharge mechanism is formed.

2I is a tape impregnated with a color-changing reagent consisting of an alcoholic solution of an indicator such as bromo thymol blue and starch paste;
The thumbtack 22 attached to the second side is a recording device (VTR, still camera, etc.) for recording the state of discoloration of the tape 21.

In such a device, first, the controller 12 applies an electric signal to the drive source 11 to operate the drive source II. The power from the drive source 11 is Boo'J-10, transmission heald 13
This is transmitted to the pulley 9 and rotating shaft 8, and rotates the rotating shaft 8.

As a result, the one-turn plate 5 rotates, and the terrain model 4 placed on the two-turn plate 5 is set to a predetermined wind direction.

Further, since the bearing 6 is provided, the rotating plate 5 is maintained horizontally and can rotate smoothly.

Note that a signal corresponding to a predetermined set angle of the wind direction is input to the controller 12 in advance.

Next, the tape 21 pasted on the top surface of the topographical model 4 is impregnated with a color-changing reagent consisting of an alcohol solution of an indicator such as brome thymol blue and starch paste (this color-changing reagent has the property of changing color). The mixed gas flow rate 5118 is monitored so that a predetermined amount of a mixed gas, such as a mixed gas of air and ammonia, is discharged.
Adjust 0. By this 41, 431 passages of the mixed gas l1
It is discharged from the chimney model 2 into the measurement cylinder 1 via 819.

In the measurement cylinder 1, air is generated from the chimney 2 by the air generated by a hole plate-shaped airflow control device that allows the fan 14 to rotate once to achieve predetermined airflow conditions (wind speed, wind distribution, turbulence, etc.). The discharged mixed gas +J is diffused.

The action of the airflow control device 15 is such that the controller 15-8 drives the pulse motor 15-7.
The rotational power is transmitted to the diaphragm rotating shaft 15-3 via the A-mpool 15-6.

As a result, the vibration tFj] 51 swings like the arrow +5-10, creating an airflow with a high degree of turbulence. The diaphragm 15-1 is vertically supported by a bearing 15-4. Note that the adjustment of 1 air flow condition (11 (turbulence degree)
51 deflection 11J, angular period, etc., so the predetermined airflow line is set in advance! Ib5 of the diaphragm 5-1 that can reproduce the diaphragm 5-1 [IJ, angular period, etc. data are input into the controller 15-8.

Furthermore, the vibration period of the I-percussion plate 15-1 is designed so that it can be carried out both regularly and irregularly.

Next, the diffused gas comes into contact with the tape 21 impregnated with a color-changing reagent attached to the surface of the topographical model 41, and the discolored paper changes color from orange-yellow to yellow-green to indigo. It is possible to know the diffusion status of the mixed gas discharged from the assistant.

The method for impregnating the tape 21 with the color-changing reagent described above may be by spraying the surface of the tape, or by immersing the entire tape in the color-changing reagent solution.

Further, the amount of impregnation may be determined depending on the time period indicating the state of discoloration. For example, if the maintenance time is to be increased, the amount of F should be increased, and if the maintenance time is to be shortened, the amount of F can be decreased.

Furthermore, if you observe with the naked eye or with a recording device 23 such as a camera how the discolored area expands over the course of 2 hours (usually about 1 to 2 minutes), it will be qualitatively clear that It is also possible to estimate the concentration distribution of the mixed gas.

As a substance mixed with air and discharged from the chimney model 4, i
;1: In addition to alkaline gases such as ammonia mentioned in the handbook examples, acids and gases such as sulfite scum and hydrogen chloride
1q゛gas can also be used.

According to this example, under conditions that reproduce airflow characteristics with relatively large turbulence, the gas discharged from the chimney - J
- A qualitative method using model tests to determine the diffusion area for any wind direction at low cost.

It can be set quickly and accurately.

Therefore, the basic data necessary for preventing the popular Iη staining caused by chimney exhaust gas etc. can be extremely effectively provided.

[Brief explanation of drawings]

FIG. 1 is a diagram of a smoke diffusion model testing device showing an embodiment of the present invention, FIG. 2 is an explanatory diagram of its main parts, and FIG. 3 is an enlarged perspective view of an airflow control device. 1. Measurement cylinder, 2; 3; 4. Terrain model. 5... Rotating plate, 15i16... Airflow control material. 2] Continued from page 1 of the tape 0 Inventor: Hata Ide, Akunoura-cho, Nagasaki City 0 Inventor: Shigeru Nishijima, Akunoura-cho, Nagasaki City

Claims (1)

[Claims] a wind tunnel, a topographic model disposed in a side body of the wind tunnel, a rotary plate supporting the topographic model, a rotatable plate-shaped airflow control device disposed upstream of the topographic model, and the above-mentioned The present invention is characterized by comprising a discharge mechanism for discharging gas from the terrain model, and a tape coated with a color-changing reagent that is placed on two sides of the J-biped terrain model and reacts with the gas discharged from the discharge mechanism. A smoke diffusion model test device.