JPH0346341Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention provides a method for measuring the flow rate of granular materials such as copper concentrate supplied to the concentrate burner of a flash smelting furnace for copper smelting using an impact type flowmeter installed in the flow path. The present invention relates to a device for reducing measurement errors.

Conventionally, when measuring the flow rate of the granular material to be supplied to the concentrate burner of a flash furnace, as shown in FIG. A casing 6 is provided in the casing 6, and a detection plate 4a is provided in the casing 6 to measure the horizontal component of the impact force generated when the powder and granules flowing down from the raw material feeder 1 to the concentrate burner 2 collide with the detection plate 4a. By measuring the flow rate, the raw material feeder 1 controls the amount of raw material charged. However, the gas pressure at the tip 2a of the burner 2 becomes negative due to the hot air supplied from the hot air pipe 7 and flowing around its outer periphery at high speed, so that a large amount of air is sucked in from the supply pipe 3 together with the raw material. As a result, the detection plate 4a measures the horizontal component of the impact force caused by the impact of the raw material and the air flow, which poses a problem in that errors in measuring the raw material occur. Furthermore, this negative pressure fluctuation is not constant due to changes in the furnace conditions of the flash furnace, combustion conditions of the burner, and hot air volume, so the fluctuation of measurement errors is large, and the temperature of the air flowing in with the raw materials is low, so it is difficult to reduce the fuel consumption rate. There were also problems such as worsening the situation.

As a countermeasure against this problem, if a pressure equalizing pipe 5 is provided that connects the upstream and downstream sides of the detection plate 4a, if the diameter of this pressure equalizing pipe 5 is small, not only will the effect be small, but the raw material will adhere to the inner wall of the pipe and cause blockage. There are easy problems,
If the diameter of the pressure equalization tube 5 is increased, the above-mentioned problem is solved, but a problem arises in that a part of the raw material flows into the pressure equalization tube together with the air flow and bypasses it, so that it is not measured. Furthermore, in either case, deterioration of the thermal economy due to the inflow of cold air is unavoidable.

The object of the present invention is to provide a measuring device that solves the above problems.

In order to achieve this purpose, the present invention includes a casing installed in the middle of the supply pipe connecting the concentrate burner of the flash furnace and the raw material feeder, a detection plate placed inside the casing, and a casing that connects the raw material feeder to the concentrate burner. In a measuring device that has a measuring device that measures the horizontal component force generated when the powder or granular material that passes and flows down collides with the detection plate, there is a pressure gauge that measures the gas pressure inside the casing, and a pressure gauge that is connected to the pressure gauge. A regulator operated by a meter, a hot air pipe that supplies hot air to the tip of the concentrate burner, a branch pipe that connects the casing of the supply pipe and the concentrate burner, and a regulator operated in the middle of the branch pipe. The present invention consists in configuring a metering device that is provided with a control valve that is provided to be controlled.

An embodiment thereof will be described below with reference to the drawings.

FIG. 2 is an explanatory view of the apparatus of the present invention, in which a concentrate burner 2 is vertically provided at the upper end of a copper smelting flash furnace (not shown). A supply pipe 3 is provided that connects the vicinity of the upper end of the side surface of the concentrate burner 2 and the raw material feeder 1 provided above it. Supply pipe 3
A detection plate 4a is disposed inside the casing 6 provided in the middle of the casing 6, and a measuring device 4 is disposed outside the casing 6 to detect the horizontal component force generated when powder particles collide with the detection plate 4a. . Further, a branch pipe 8 is provided which connects the hot air pipe 7 to the middle of the supply pipe 3 between the casing 6 and the concentrate burner 2. A control valve 9 is provided in the middle of the branch pipe 8. A pressure gauge 10 is provided to measure the gas pressure inside the casing 6, and the control valve 9 is opened and closed by a regulator 11 connected to the pressure gauge 10 and operated by the pressure gauge 10. . Therefore, if the regulator 11 is set to maintain the desired air pressure inside the casing 6, if the air pressure inside the casing 6 drops below the set air pressure, the opening of the control valve 9 will increase and the hot air on the positive pressure side will be diverted. It flows into the supply pipe 3 on the negative pressure side through the pipe 8, and once the desired pressure is reached, the opening degree of the control valve 9 is maintained so as to maintain this pressure. Conversely, if the air pressure inside the casing 6 becomes higher than the set value, the opening degree of the control valve 9 is reduced to maintain a constant pressure.

As a result of installing the device of the present invention in a flash smelting furnace for copper smelting and operating it by setting the air pressure inside the casing 6 to -10 to -20 mmH ₂ O, the measurement error was 7.
The temperature was improved from ~17% to less than 3%, and as a result, the supply of raw materials was stabilized, and the intake cold air was replaced with hot air, resulting in better combustion in the burner, stabilizing the furnace condition, and lowering the fuel consumption rate. Very remarkable effects were obtained. The device of the present invention can reduce measurement errors caused by free air if applied not only to flash furnaces but also to situations where there is a pressure difference between the upstream and downstream sides of the casing of a meter and there is a risk of sucking in free air.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a conventional measuring device, and FIG. 2 is an explanatory diagram of a measuring device of the present invention. 1... Raw material feeder, 2... Concentrate burner,
3... Supply pipe, 4... Measuring device, 4a... Detection plate,
5... Pressure equalization pipe, 6... Casing, 7... Hot air pipe, 8... Branch pipe, 9... Control valve, 10... Pressure gauge, 11... Regulator.

Claims (1)

[Scope of utility model registration request] A casing installed in the middle of the supply pipe connecting the concentrate burner of the flash furnace and the raw material feeder, a detection plate placed inside the casing, and the powder and granules flowing down from the raw material feeder to the concentrate burner through the casing. A measuring device that has a pressure gauge that measures the gas pressure in the casing, a regulator that is connected to the pressure gauge and is operated by the pressure gauge, and , a hot air pipe that supplies hot air to the tip of the concentrate burner, a branch pipe that connects the casing of the supply pipe and the concentrate burner, and a branch pipe that is provided in the middle of the branch pipe so as to be controlled by a regulator. A measuring device for powder and granular material charged into a flash furnace, characterized in that it is provided with a control valve.