JP2005291608A - Gas pressure regulating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To maintain gas pressure in a secondary side pipe at first set supply pressure and prevent a rapid maintenance operation for re-starting earlier normal gas supply through a first governor from being requested by making a sufficient amount of gas flow from which dust is removed from a primary side pipe into the first governor so that the first governor can be effectively utilized even if a first filter device in a main governor circuit is clogged. <P>SOLUTION: The main governor circuit 12 in which the first filter device 9 is connected to the first governor 11 and a preliminary governor circuit 16 in which a second filter device 13 is connected to a second governor 15 are connected parallel with each other. The gas inflow side of the first governor is connected to the gas outflow side of the second filter device through a bypass passage 22. The apparatus also comprises a normally closed valve 23 capable of opening and closing the bypass valve, and a control part 24 controlling a valve so as as to be opened when the dropped amount of gas pressure across the first filter device exceeds a set drop amount. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention provides a gas from the primary side pipe to the secondary side pipe while adjusting the flow rate so that the gas pressure in the secondary side pipe becomes a first set supply pressure lower than the gas pressure in the primary side pipe. A main governor circuit in which a first filter device for filtering gas flowing into the first governor from the primary side pipe is connected to a first governor capable of flowing through, and a gas pressure in the secondary side pipe is The primary side pipe is connected to a second governor that allows gas to flow from the primary side pipe to the secondary side pipe while adjusting the flow rate so that the second set supply pressure is lower than the first set supply pressure. And a spare governor circuit to which a second filter device for filtering gas flowing into the second governor is connected, the gas inflow sides of the first and second filter devices communicate with the primary pipe, And gas outlet side of the second governor Wherein a gas pressure control equipment is connected in parallel so as to communicate with the secondary pipe.

In the gas pressure adjusting equipment, an abnormality occurs in the operation of the first governor in the main governor circuit, and the flow of gas into the first governor is stopped by, for example, closing the shutoff valve. When the gas pressure becomes lower than the first set supply pressure, the operation of the second governor in the spare governor circuit causes the gas pressure in the secondary side pipe to become a second set supply pressure lower than the first set supply pressure. The flow rate is adjusted so that gas flows from the primary side pipe to the secondary side pipe so that the gas supply amount to the secondary side pipe can be secured, and the secondary side is passed through the first governor. When the gas is allowed to flow through the side pipe, or when the gas is allowed to flow through the second governor to the secondary side pipe, the malfunction of the first and second governors due to adhesion of dust such as scale will not occur. , Main governor circuit and spare governor In each circuit, the first and second filter devices for removing dust corresponding to the first and second governors are connected to prevent the dust from flowing into the first and second governors. Yes.
In the conventional gas pressure adjusting equipment, the first filter device in the main governor circuit is clogged, and the amount of gas flowing into the first governor through the first filter device is reduced. As a result, the first governor Even when there is no abnormality in operation, even when the gas pressure in the secondary side pipe becomes lower than the first set supply pressure, the secondary governor circuit operates to the secondary side pipe by the operation of the second governor. The gas supply amount can be secured (a conventional technique, and information on prior art documents cannot be disclosed).

For this reason, when the first filter device in the main governor circuit is clogged, there is a defect that the first governor cannot be effectively used even though there is no abnormality in the operation of the first governor. The main governor circuit is inspected so that the normal gas supply through the one governor can be resumed at an early stage, and the cause of the gas pressure in the secondary side piping being lower than the first set supply pressure is investigated. There is a drawback in that when it is found that the filter device is clogged, maintenance work such as eliminating the clogging of the first filter device must be performed quickly.
The present invention has been made in view of the above circumstances, and even when the first filter device in the main governor circuit is clogged, a sufficient amount of dust is removed so that the first governor can be used effectively. To allow gas to flow from the primary side pipe to the first governor to maintain the gas pressure in the secondary side pipe at the first set supply pressure, and to resume normal gas supply through the first governor at an early stage. The purpose of this is not to require a quick maintenance work.

  The first characteristic configuration of the present invention is that the flow rate is adjusted so that the gas pressure in the secondary side pipe is lower than the gas pressure in the primary side pipe, and the second side pipe is used to adjust the flow rate from the primary side pipe. A main governor circuit in which a first filter device for filtering gas flowing into the first governor from the primary side pipe is connected to a first governor capable of flowing gas to the secondary side pipe; and the secondary side pipe A second governor capable of flowing gas from the primary side pipe to the secondary side pipe while adjusting the flow rate so that the gas pressure inside becomes a second set supply pressure lower than the first set supply pressure. A spare governor circuit connected to a second filter device for filtering gas flowing into the second governor from the primary side pipe, and a gas inflow side of the first and second filter devices communicating with the primary side pipe. And the first and second governors A gas pressure adjusting facility connected in parallel so that a gas outflow side of the gas is connected to the secondary side pipe, the gas inflow side of the first governor on the downstream side of the first filter device, and the first The gas before and after passing through the first filter device is provided by connecting the gas outflow side of the second filter device upstream of the two governors with a bypass passage, and providing a normally closed valve that can open and close the bypass passage. A control unit is provided for controlling the valve to open when the pressure drop exceeds the set drop.

[Action and effect]
The gas inflow side of the first governor on the downstream side of the first filter device and the gas outflow side of the second filter device on the upstream side of the second governor are connected by a bypass path, and the bypass path can be freely opened and closed. Since a normally closed valve is provided and a control unit is provided to control the valve to open when the gas pressure drop amount before and after passing through the first filter device exceeds the set drop amount, the first filter device is provided. The clogged state is determined based on the amount of gas pressure drop before and after passing through the gas filter, the gas pressure drop amount is less than the set drop amount, and the first filter device is not clogged or is in an allowable range. Can be determined, the gas outflow side of the second filter device and the gas inflow side of the first governor do not communicate with each other, and the gas filtered by the first filter device flows into the first governor and enters the secondary side pipe. Gas pressure can adjust the flow rate such that the first set supply pressure lower than the gas pressure in the primary side in the pipe.
Further, when the gas pressure drop amount exceeds the set drop amount and it can be determined that the clogging of the first filter device exceeds the allowable range valve, the valve opens and the gas of the second filter device is opened. The outflow side communicates with the gas inflow side of the first governor, the gas filtered by the second filter device flows into the first governor, and the gas pressure in the secondary side pipe is higher than the gas pressure in the primary side pipe. The flow rate can be adjusted to be a low first set supply pressure.
Therefore, even if the first filter device in the main governor circuit is clogged, a sufficient amount of gas from which dust has been removed is allowed to flow from the primary side pipe to the first governor so that the first governor can be used effectively. Thus, the gas pressure in the secondary side pipe can be maintained at the first set supply pressure, and a quick maintenance operation for resuming normal gas supply through the first governor at an early stage is not particularly required.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a gas pressure adjusting facility A for supplying city gas according to the present invention, wherein a lead-in pipe 2 provided with a gas shut-off device 1 and a primary side pipe 3 of the gas pressure adjusting facility A are connected to an insulating joint 4. And the secondary side pipe 5 of the gas pressure adjusting equipment A is connected to the user side gas consuming device B via the gas meter 6 and the gas plug 7, and the secondary side pipe 5 is sealed with water. A type safety device 8 is provided.

  The gas pressure adjusting equipment A includes a first filter device 9, a first pressure increase prevention valve (shutoff valve) 10 and a first governor 11 for preventing an increase in secondary pressure from the primary side pipe 3 side. The main governor circuit 12 connected in series in the order of description, the second filter device 13, the second pressure rise prevention valve (shutoff valve) 14 for preventing the secondary pressure from rising, and the second governor 15, The spare governor circuit 16 connected in series in the order of description from the primary side pipe 3 side is connected to the primary side pipe 3 on the gas inflow side of the first and second filter devices 9, 13, and the first and second governors 11. , 15 are connected in parallel between the primary side pipe 3 and the secondary side pipe 5 so that the gas outflow side communicates with the secondary side pipe 5.

  Each of the first filter device 9 and the second filter device 13 is constituted by a dringer-type or angle-type filter device in which a filter element is detachably mounted in the pressure vessel 17, and the gas inflow side is The first inlet valve 18 and the second inlet valve 19 communicate with the primary pipe 3 side, and the gas outlet side communicates with the corresponding first pressure rise prevention valve 10 side and second pressure rise prevention valve 14 side. In connection, the first filter device 9 filters the gas flowing into the first governor 11 from the primary side pipe 3, and the second filter device 13 filters the gas flowing into the second governor 15 from the primary side pipe 3 It is provided to do.

  The first governor 11 is connected to the secondary side pipe 3 from the primary side pipe 3 while adjusting the flow rate so that the gas pressure in the secondary side pipe 5 becomes a first set supply pressure lower than the gas pressure in the primary side pipe 3. The gas is allowed to flow through the first outlet valve 20 in the side pipe 5.

  The first pressure rise prevention valve 10 is provided integrally with the first filter device 9, and when the gas pressure in the secondary side pipe 5 exceeds the first set pressure higher than the first set supply pressure, the first pressure rise prevention valve 10 is provided. The gas flow to the secondary side pipe 5 through the governor 11 is configured to be blocked.

  As a result of the second governor 15 blocking the gas flow to the secondary side pipe 5 through the first governor 11 by the first pressure rise prevention valve 10, the gas pressure in the secondary side pipe 5 is reduced. Sometimes, the second side pipe 5 is changed from the primary side pipe 3 to the secondary side pipe 5 while adjusting the flow rate so that the gas pressure in the secondary side pipe 5 becomes the second set supply pressure lower than the first set supply pressure. A gas can be passed through the outlet valve 21.

  The second pressure rise prevention valve 14 is provided integrally with the second filter device 13, and when the gas pressure in the secondary pipe 5 exceeds a second set pressure higher than the second set supply pressure, the second pressure rise prevention valve 14 is second. The gas flow to the secondary side pipe 5 through the governor 15 is configured to be blocked.

  The gas inflow side of the first governor 11 on the downstream side of the first filter device 9 and the gas outflow side of the second filter device 13 on the upstream side of the second governor 15 are connected in communication by a bypass 22. In addition, a normally closed electromagnetic valve 23 that can open and close the bypass path 22 is provided, and when the amount of gas pressure drop before and after passing through the first filter device 9 exceeds the set drop amount, the solenoid valve 23 opens. A control unit 24 for controlling is provided.

  The control unit 24 detects a pressure of a gas flowing into the first filter device 9 and a first pressure sensor 25 that detects a pressure of the gas flowing out from the first filter device 9 through the first pressure rise prevention valve 10. 2 pressure sensor 26, and based on the detection information input from the first and second pressure sensors 25, 26, the gas pressure drop amount before and after passing through the first filter device 9 exceeds the set drop amount. If it is determined that the first filter device 9 is clogged, the solenoid valve 23 is energized to open, and the second filter device 13 and the first governor 11 are connected via the bypass 22. Communicate.

  Therefore, in addition to the gas from which the dust has been removed by the first filter device 9, the gas from which the dust has been removed by the second filter device 13 can also flow into the first governor 11, so that the first governor 11 can be used effectively. As described above, a sufficient amount of gas from which dust has been removed can be caused to flow from the primary side pipe 3 into the first governor 11 to maintain the gas pressure in the secondary side pipe 5 at the first set supply pressure.

[Other Embodiments]
1. The gas pressure adjusting equipment according to the present invention may be provided so that the set drop amount of the gas pressure can be changed.
2. The gas pressure adjusting equipment according to the present invention includes a control unit that controls to stop the flow of the gas that has passed through the first filter device into the first governor when the normally closed valve provided in the bypass passage is opened. It may be provided.
3. The gas pressure adjusting equipment according to the present invention may be provided to supply gas to a specific facility such as a factory, an apartment house, a hospital, or a school.
4). The gas pressure adjusting equipment according to the present invention may be provided to constitute a part of production equipment (plant) provided in a factory.
5). The gas pressure adjusting equipment according to the present invention may be provided for supplying propane gas in addition to a city gas supply system such as methane gas.

System diagram showing the outline of gas pressure control equipment

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 Primary side piping 5 Secondary side piping 9 1st filter apparatus 11 1st governor 12 Main governor circuit 13 2nd filter apparatus 15 2nd governor 16 Reserve governor circuit 22 Bypass path 23 Normally closed type valve 24 Control part

Claims (1)

Gas can flow from the primary side pipe to the secondary side pipe while adjusting the flow rate so that the gas pressure in the secondary side pipe becomes the first set supply pressure lower than the gas pressure in the primary side pipe A main governor circuit in which a first filter device for filtering gas flowing into the first governor from the primary pipe is connected to the first governor;
Gas can flow from the primary side pipe to the secondary side pipe while adjusting the flow rate so that the gas pressure in the secondary side pipe becomes a second set supply pressure lower than the first set supply pressure. A spare governor circuit in which a second filter device for filtering gas flowing into the second governor from the primary pipe is connected to the second governor,
Gas pressure adjustment connected in parallel so that the gas inflow sides of the first and second filter devices communicate with the primary side piping and the gas outflow sides of the first and second governors communicate with the secondary side piping. Equipment,
The bypass passage connects the gas inflow side of the first governor downstream of the first filter device and the gas outflow side of the second filter device upstream of the second governor by a bypass passage. A normally closed valve that can be opened and closed
A gas pressure adjusting facility provided with a control unit for controlling the valve to open when a gas pressure drop amount before and after passing through the first filter device exceeds a set drop amount.

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