JPH0663603B2 - Steam supply amount maintenance device for tea making boiler - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an apparatus for maintaining a constant supply amount of steam in a tea manufacturing boiler, and more particularly, to an apparatus capable of adjusting a pressure inside a steam chamber to a predetermined pressure. It is a thing.

(Prior Art) In order to produce green tea, raw tea leaves collected from a tea garden are first subjected to steam heat treatment, and then subjected to treatments such as rough kneading, kneading, middle kneading, and fine kneading.

Therefore, a boiler is connected to the steamer to supply steam to the steamer.

Of course, in this case, the adequacy of the steam supply amount affects the quality of the product green tea. If the steam supply amount is small, steaming will be insufficient, and if it is too large, the steaming will be excessive and the quality of the product green tea will be improved. It will decrease.

For this reason, the present inventor has developed a device for making the steam supply amount constant in the tea making boiler, and has already applied for a patent (Japanese Patent Application No. 60-194493) [JP-A-62-55042].
No. publication].

In this one, a switch for opening and closing the fuel supply valve in response to an output signal from a controller is attached to a fuel supply valve of a burner of a boiler, and an orifice is formed at an appropriate position of a supply pipe from the boiler to a steamer. A pressure detector is installed on the boiler side near the orifice, the steam pressure fluctuation is detected at this position, and the burner heating power is adjusted according to this pressure fluctuation to adjust the steam flow fluctuation range. Is set within a certain range, so that steam is quantitatively supplied.

By the way, fresh tea leaves picked up at tea plants are brought to tea factories, but these tea gardens have different ages of tea trees, and there is a difference in the degree of growth of tea buds. The nature of each tea garden is different. Therefore, when steaming the raw tea leaves, it is necessary to adjust the amount of steam to be supplied and adjust the temperature of the steam according to the properties of the raw tea leaves, as described above.

Of course, a conventional boiler was also equipped with a mechanism to control the pressure in the steam chamber and the amount of steam supplied, but the steamer requires a small amount of steam, and the difference in steam temperature due to the difference in the properties of the raw tea leaves. Is small and its temperature is low, 100 ℃
Therefore, it is necessary to control the temperature and supply amount of steam within a very small range, but it is impossible for the conventional control mechanism to perform such control. The heat treatment conditions had a certain degree of unevenness.

On the other hand, the above-mentioned device that keeps the amount of steam supplied constant can control the amount of steam supplied to be almost constant, but the pressure in the steam chamber of the boiler can be changed quickly every time the raw tea leaves to be treated change. It could not be changed.

(Summary of the Invention) The present invention has been made in view of the above points, and an electric valve is attached in front of a pressure detector of a device that makes the supply amount of steam described above constant, and a pressure is applied to a steam chamber of a boiler. Attach a detector or a temperature detector, connect them via a separate control device, set the steam pressure or temperature in the steam chamber, and respond if the pressure or temperature deviates from the set value. By adjusting the opening / closing amount of the electric valve, the pressure or temperature of the steam in the steam chamber and the supply of steam to the steamer are controlled.

(Examples) The present invention will be specifically described below based on illustrated examples.

In the figure, reference numeral 1 is a boiler, 2 is a steamer, 5 is a burner, 6 is a fuel supply valve, and 7 is a switch. These are the same as those for the tea manufacturing boiler (Japanese Patent Application No. 60-194493) already described. The water in the body is heated and then discharged into the atmosphere through the exhaust pipe 9. A steam supply pipe 11 is arranged between the steam chamber 10 and the steamer 2 to supply a predetermined amount of steam to the steamer 2. Further, the steamer 2 is provided with a constant-feeding conveyor 12 for fresh tea leaves so that the fresh tea leaves can be quantitatively charged into the steamer 2. Burner 5
Is no different from the usual one. That is, the fuel supply pipe 13 is connected to the burner 5 and the fuel supply valve 6 is attached to the burner 5 so that the amount of fuel supplied to the burner 5 is adjusted to control the amount of heat generated by the burner. The fuel supply valve 6 of the burner 5 receives the output signal from the first controller 15A and operates to operate the fuel supply valve 6
A switch 7 for automatically opening and closing is attached to the steam supply pipe 11, an orifice 3 is attached to the steam supply pipe 11 at a proper position, and a pressure detector 4 is attached to a position just before the orifice 3. It is connected to the controller 15A. These are a kind of vapor flow rate control mechanism, and the pressure detector 4 changes the pressure of the vapor in front of the orifice 3 into a resistance value and transmits this to the first controller 15A. 1
5A compares this resistance value with a preset value, converts the difference into a current of about 4 to 20 mA D.C. and transmits it to the switch 7, and opens and closes the fuel supply valve 6 according to the current value. With this, the heating power of the burner 5 is adjusted to adjust the steam pressure of the boiler, thereby maintaining the supply amount of steam to the steamer 2 within the set range. The boiler configured in this way is equipped with a mechanism for controlling the pressure of steam in the steam chamber 10,
The temperature of the steam supplied to the steamer 2 is adjusted. That is, a pressure detector 14 or a temperature detector is attached to the steam chamber 10 of the boiler 1 and is connected to the second controller 15B, and an electric valve 16 is attached to the steam supply pipe 11 before the pressure detector 4. This is connected to the second controller 15B. The pressure detector 14 is for detecting the pressure of the steam in the steam chamber 10,
As an example, a resistance type pressure sensor is provided for converting the pressure of steam into a resistance value and transmitting the resistance value to the second controller 15B, while the second controller 15B has a preset value and this resistance value. The values are compared, the difference between the two is converted into a current and transmitted to the electric valve 16, and the electric valve 16 is opened / closed according to the current value to adjust the flow rate of steam.

(Operation) When the boiler configured as described above is operated in a steady state, the set value of the pressure (temperature) of the steam in the steam chamber 10 is changed. As an example, when the set value is increased, a difference occurs between the set value and the pressure of the steam chamber by the pressure detector 14, and the detected value apparently decreases. Therefore, the second controller 15B transmits the difference between the two to the electric valve 16 and slightly throttles this valve to reduce the amount of steam flowing there. Then electric valve 16
The pressure of the steam in the steam supply pipe further decreases, and the detected value of the pressure of the steam in the pipe by the pressure detector 4 becomes the pressure detector 4.
Therefore, the first controller 15A transmits the difference to the switch 7 to open the fuel supply valve 6 to increase the amount of fuel supplied to the burner 5 and increase the heating power of the burner 5. To do. Therefore, the pressure of the steam in the steam chamber 10 gradually rises, and eventually reaches the set value.
16 also opens a predetermined amount and enters a steady state.

(Effect) As described in detail above, according to the present invention, in the boiler in which the pressure detector is attached to the steam supply pipe and is connected to the fuel supply valve of the burner through the first controller, the pressure detection of the steam supply pipe is performed. The electric valve is installed in front of the reactor, the pressure detector or temperature detector is attached to the steam chamber, and both are connected via the second controller, and the pressure (temperature) of the steam in the steam chamber and its set value are connected. A device for transmitting the difference to an electric valve to open and close it, thereby adjusting the pressure of steam in the steam chamber to a set value, and supplying a desired amount of steam at a desired temperature to the steam. Is.

[Brief description of drawings]

 The drawing is a schematic view showing an embodiment of the present invention. 1: Boiler, 2: Steamer 3: Orifice, 4: Pressure detector 5: Burner, 6: Fuel supply valve 7: Switch, 8: Furnace tube 9: Exhaust tube, 10: Steam chamber 11: Steam supply tube, 12 : Input conveyor 13: Fuel supply pipe, 14: Pressure detector 15A: First controller, 15B: Second controller 16: Motorized valve

Claims (1)

[Claims] 1. A fuel supply valve for a burner of a boiler is provided with a switch for opening and closing the fuel supply valve in response to an output signal from a first controller 15A, and an orifice is provided at an appropriate position of a steam supply pipe from the boiler to steam. Is formed, and the pressure detector 4 is attached to the boiler side, and the pressure detection output is
In the boiler for tea making which is transmitted to the controller 15A, the electric valve which opens and closes in response to the output signal from the second controller 15B is attached to the boiler side of the steam supply pipe with respect to the pressure detector 4. Install the pressure detector 14 or temperature detector in the steam chamber of the boiler, and attach it to the second controller.
A steam supply amount maintenance device in a tea making boiler, which is connected to 15B and transmits a detection output of pressure or temperature of steam in a steam chamber to a second controller 15B to open and close an electric valve.