CN111536549A - Leather bag type self-stabilizing device for fuel oil system - Google Patents

Abstract

The invention discloses a leather bag type self-stabilizing device for a fuel oil system, which comprises an oil tank and an inert gas chamber, wherein a flange is connected at an opening of a rubber air bag, the oil tank is sequentially connected with an oil pump and a check valve through a pipeline, one path of an outlet of the check valve is connected with a furnace front fuel oil system through a furnace front electric valve and a furnace front fuel oil pressure transmitter, the other path of the outlet of the check valve is connected with an air bag electric valve, an outlet of the air bag electric valve is divided into two paths, one path is connected with the flange, the other path is connected with the oil tank through an accident oil drain valve, an air bag pressure transmitter and an air bag local pressure meter are sequentially arranged on the pipeline between the air bag electric valve and the flange, the furnace front fuel oil pressure transmitter, the air bag pressure transmitter and the air chamber pressure transmitter. The invention not only can save a large amount of electricity consumption of the oil pump, but also prolongs the service life of the oil pump and reduces the maintenance workload of vulnerable parts of a fuel system.

Description

A bladder-type self-stabilizing device for fuel system

technical field

The invention relates to the field of fuel oil systems of thermal power boilers, in particular to a bladder-type self-stabilizing device for fuel systems.

Background technique

In case of emergency (such as failure of key equipment) or low-load operation, the thermal power boiler needs to be put into the oil gun for stable combustion, so the fuel system needs to be in a standby state at all times, which will make the oil pump run for a long time. According to the estimation that the oil pump supplies oil to two boilers at the same time, the cumulative operating hours of the oil pump exceeds 6,000 hours in the whole year, but in fact, the average cumulative time of the oil gun in operation throughout the year is less than 200 hours, that is to say, the actual utilization rate of the oil pump is only 3.3 %, and 96.7% of the time is in a no-load idling state, which will cause a great waste of electric energy.

In response to this problem, at present, power plants mainly adopt the method of frequency conversion of oil pumps to reduce power consumption. Although this method can save a part of electric energy, it cannot stop the operation of the oil pump, and there is still a large energy consumption.

SUMMARY OF THE INVENTION

In order to solve the shortcomings and deficiencies of the prior art, a bladder-type self-stabilizing device for the fuel system is provided. The principle is advanced and the structure is simple, which can make the fuel oil in front of the furnace stop when the oil pump stops running and does not need to consume any energy. The oil pressure of the system is automatically stabilized at the design value, which can not only meet the conditions that the oil gun can be put into combustion support at any time, but also meet the requirements of the fuel pressure and fuel flow when the boiler is put into fuel combustion support within the set time (usually not more than 20 minutes). It is required to achieve the purpose of "do not need to start the oil pump during the normal operation stage of the boiler, and start the oil pump only when the oil needs to be put in", which can not only save a lot of power consumption of the oil pump, but also prolong the service life of the oil pump and reduce the wearing parts of the fuel system. maintenance workload.

A bladder-type self-stabilizing device for a fuel system provided to achieve the purpose of the present invention includes an oil tank and an inert gas chamber, wherein a rubber air bag for storing high-pressure fuel is arranged in the inert gas chamber, and the rubber air bag A flange is connected to the opening of the fuel tank, an oil pump and a check valve are sequentially connected to the oil tank through a pipeline, and the outlet of the check valve is connected to the fuel system in front of the furnace through the electric valve in front of the furnace and the fuel pressure transmitter in front of the furnace. , the other way is connected with the airbag electric valve, the outlet of the airbag electric valve is divided into two ways, one way is connected with the flange, the other way is connected with the oil tank through the accident drain valve, and the airbag electric valve is connected with the The pipeline between the flanges is sequentially provided with an airbag pressure transmitter and an airbag on-site pressure gauge, and the inert gas chamber wall is provided with a gas chamber pressure transmitter, a gas chamber on-site pressure gauge, a safety valve, a discharge Gas electric valve, maintenance manhole, the inert gas chamber is connected with the collecting header through the pipeline provided with the intake electric valve, the collecting header is connected with the gas supply cylinder group through the high-pressure hose, the electric valve in front of the furnace There is a fuel pressure transmitter in front of the furnace on the pipeline between the fuel system in front of the furnace. The fuel pressure transmitter in front of the furnace, the pressure transmitter in the air bag and the pressure transmitter in the air chamber are all connected to the automatic control cabinet through cables. Connection, the automatic control cabinet is used to control the start or stop of the oil pump.

The beneficial effects of the present invention are:

1. The present invention can use the oil pump to store a certain amount of high-pressure fuel in the rubber air bag. That is to say, when the boiler does not need oil to assist combustion, the electric valve in front of the furnace can be closed, the electric valve of the air bag can be opened, and the oil pump can be started at this time, and the fuel can be transported into the rubber air bag for storage. When the air bag pressure transmitter detects When the pressure rises to the design value (the value is set according to the lift of the oil pump), the oil pump is automatically stopped, the oil storage process of the rubber air bag is over, and then the electric valve in front of the furnace is automatically opened, and the high-pressure fuel stored in the rubber air bag is used to keep the fuel in front of the furnace. The pressure of the system meets the design requirements. At the same time, since a check valve is installed at the outlet of the oil pump, the fuel in the oil storage tank will not flow back to the oil tank when the oil pump stops running.

2. In the present invention, the oil pump can be in a stopped state during the normal operation stage of the boiler (that is, when no oil injection is required), because the present invention can utilize the rubber air bag to meet the oil consumption required by the boiler to inject oil to support combustion during the startup of the oil pump. Its working process can be described as: when the boiler is in normal operation, the oil pump is stopped; when the boiler has an emergency situation (such as some equipment failure), when the oil needs to be injected to assist combustion, the fuel oil stored in the rubber air bag is first used to control the boiler. To stabilize the combustion, start the oil pump at the same time. When the oil pump runs normally and can deliver the fuel to the fuel system in front of the furnace, the electric valve of the air bag is closed, and the oil pump provides the required combustion-supporting oil at this time. Therefore, the fuel oil stored in the rubber airbag can meet the fuel consumption required during the start-up of the oil pump, so as to obtain sufficient time for starting the oil pump, so that the oil pump can be in a stopped state when no fuel injection is needed to support combustion, thereby reducing the The power consumption of the oil pump and the loss of the oil pump itself.

3. The present invention can make use of the inert gas in the inert gas chamber to automatically stabilize the oil pressure of the fuel oil system in front of the furnace at the design value. It can be described as: fuel is an incompressible liquid, so when its volume is reduced, the pressure will drop rapidly, so when the rubber bladder is used to supply fuel for combustion, if there is no other external force, its oil pressure will drop rapidly, resulting in a fuel system. Can not work normally. In order to solve this problem, the present invention arranges the rubber airbag in the inert gas chamber, and uses the high-pressure inert gas (such as nitrogen, carbon dioxide) previously filled in the inert gas chamber to form a strong pressure on the rubber airbag, so that the rubber airbag is continuously supplied during the oil supply process. The ground is compressed, which greatly slows down the rate of oil pressure drop. Considering that the oil pressure in the rubber airbag is basically equal to the lift of the oil pump, and the lift of the oil pump is equal to the sum of the actual oil pressure required by the fuel system in front of the furnace and the resistance loss along the way, the oil pressure in the rubber airbag is higher than the actual oil pressure required before the furnace. The oil pressure should be high, so as long as the space of the inert gas chamber is large enough and enough inert gas is stored in it, the oil supply in the rubber air bag can be completed when the oil pressure in the rubber air bag drops to the oil pressure required before the furnace. task, so that the oil pressure can meet the actual needs during the whole process of oil supply of the rubber airbag.

4. The safety of the rubber airbag of the present invention is very good, and it is not easy to be damaged. This is because:

(1) The oil pressure in the rubber air bag is basically equal to the air pressure outside the rubber air bag, and the rubber air bag is in a balanced state and is basically free from force. The realization process is: the oil pressure in the rubber air bag is basically equal to the lift of the oil pump, and its pressure value is detected in real time through the air bag pressure transmitter, and the inert gas pressure outside the rubber air bag can be adjusted by the intake electric valve and the exhaust electric valve. , and continue to adjust until it is equal to the pressure in the rubber airbag, that is, when the air pressure is less than the oil pressure, the air intake electric valve is automatically opened, and the inert gas is added to the air chamber by the air cylinder group to increase the indoor pressure; when the air pressure is greater than the oil pressure , automatically open the exhaust electric valve to reduce the indoor pressure. Therefore, the internal and external pressures of the rubber airbag are balanced, the rubber airbag is basically free from force, and the service life is very long.

(2) When an abnormal situation occurs and the oil pressure and air pressure cannot be automatically adjusted to a balanced state, deal with it as follows: if the oil pressure is significantly higher than the air pressure, the accident drain valve will be opened automatically, and the fuel in the rubber airbag will flow through the pipeline. Return to the oil tank to quickly reduce the pressure in the rubber airbag; if the air pressure is significantly higher than the oil pressure, the safety valve installed on the air chamber will act to discharge the indoor gas and reduce the air pressure, and the rubber airbag is not easy to cause when it is under pressure. Damage to the rubber airbag (that is, when the pressure inside the rubber airbag is greater than the pressure outside the rubber airbag, it is easy to break the rubber airbag, but when the pressure outside the rubber airbag is greater than the pressure inside the rubber airbag, it is not easy to crush the rubber airbag). Therefore, even if there is an abnormal situation, the safety of the rubber airbag can still be guaranteed.

(3) In the present invention, inert gas such as nitrogen or carbon dioxide is used in the inert gas chamber, which will not have combustion reaction with the oil, and can suppress the combustion or explosion risk of the fuel oil, so the safety of the inert gas chamber and the rubber airbag can be guaranteed.

5. The rubber airbag of the present invention is not easy to leak, because:

(1) The rubber airbag is only connected by the flange and the pipeline, and there is no seal between the rubber airbag and the inert gas chamber, and there is no relative movement between the rubber airbag and the inert gas chamber, so the rubber airbag is not easy to occur during the working process. leakage;

(2) The rubber airbag can be regularly inspected and maintained through the maintenance manhole of the inert gas chamber to ensure that it is in good working condition.

6. In the present invention, the inert gas supply required in the inert gas chamber is very small, because the inert gas chamber will not lose inert gas during the normal working process, that is to say, after the inert gas chamber is filled with inert gas for the first time, Supplementary gas is basically no longer needed. Only in special circumstances, such as safety valve operation, maintenance and repair, need to supplement inert gas. Therefore, the present invention only needs to configure a small-capacity supplementary cylinder group to meet the actual needs.

7. The present invention can realize automatic adjustment of the whole system by using the automatic control cabinet and pressure transmitter. Its main control logic is as follows:

(1) In the stage when the boiler does not need to inject oil, if the oil pressure fed back by the airbag pressure transmitter is lower than the minimum set value (this value can be determined according to the actual needs of the user), the electric valve in front of the furnace will be automatically closed and the airbag will be opened. Electric valve, and start the oil pump to feed fuel into the rubber air bag, so that the rubber air bag is in a full state, and when the oil pressure reaches the highest set value (this value is usually determined according to the lift of the oil pump and considering a certain margin), the oil pump stops. Run, and then automatically open the electric valve in front of the furnace, and use the rubber air bag to keep the oil pressure in front of the furnace at a high level.

(2) When the boiler needs to inject oil to stabilize the combustion, first use the fuel oil provided in the rubber air bag, and automatically start the oil pump at the same time. When it works normally, the air bag electric valve is automatically closed. At this time, the oil supply is satisfied by the oil pump.

(3) Real-time monitoring of the internal and external pressure of the rubber airbag through the airbag pressure transmitter and the air chamber pressure transmitter, and synchronously controlling the intake electric valve and the exhaust electric valve to automatically adjust the air chamber pressure, so that the oil pressure and air pressure are finally reach equilibrium.

(4) If the difference between oil pressure and air pressure exceeds the set value, the accident oil relief valve will be opened automatically to reduce the oil pressure in the rubber air bag.

Description of drawings

The specific embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings, wherein:

FIG. 1 is a schematic structural diagram of the present invention.

Detailed ways

As shown in FIG. 1 , a bladder-type self-stabilizing device for a fuel system provided by the present invention includes an oil tank 1, an inert gas chamber 13, and a rubber bladder 12 for storing high-pressure fuel is arranged in the inert gas chamber 13. , the opening of the rubber airbag 12 is connected with a flange 18, and the oil tank 1 is connected with an oil pump 2 and a check valve 3 in turn through a pipeline. The outlet of the check valve 3 passes through the electric valve 14 in front of the furnace, and the fuel pressure transmitter in front of the furnace 15 is connected to the fuel system 17 in front of the furnace, and the other is connected to the airbag electric valve 4. The outlet of the airbag electric valve 4 is divided into two ways, one is connected to the flange 18, and the other is connected to the oil tank 1 through the accident drain valve 23. The pipeline between the airbag electric valve 4 and the flange 18 is sequentially provided with the airbag pressure transmitter 5, the airbag on-site pressure gauge 6, the inert gas chamber 13 wall is provided with the air chamber pressure transmitter 7, and the air chamber is on the spot The pressure gauge 8, the safety valve 9, the exhaust electric valve 22, the inspection manhole 19, the inert gas chamber 13 are connected with the collecting header 11 through the pipeline provided with the intake electric valve 10, and the collecting header 11 is connected to the collecting header 11 through the high pressure hose 20. The gas supply cylinder group 16 is connected, and the pipeline between the electric valve 14 in front of the furnace and the fuel system 17 in front of the furnace is provided with a fuel pressure transmitter 15 in front of the furnace, a fuel pressure transmitter 15 in front of the furnace, and an air bag pressure transmitter 5, The air chamber pressure transmitters 7 are each connected to the automatic control cabinet 21 through cables, and the automatic control cabinet 21 is used to control the start or stop of the oil pump 2 .

The above embodiments are not limited to the technical solutions of the embodiments themselves, and the embodiments can be combined with each other to form new embodiments. The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be included within the scope of the technical solutions of the present invention.

Claims (1)

1. A leather bag type self-stabilizing device for a fuel system is characterized in that: the fuel oil tank is connected with an oil pump and a check valve in sequence through a pipeline, one path of an outlet of the check valve is connected with a stokehole fuel oil system through a stokehole electric valve and a stokehole fuel oil pressure transmitter, the other path of the outlet of the check valve is connected with an air bag electric valve, the outlet of the air bag electric valve is divided into two paths, one path of the outlet is connected with the flange, the other path of the outlet is connected with the oil tank through an accident oil drainage valve, the air bag electric valve and the pipeline between the flanges are sequentially provided with an air bag pressure transmitter and an air bag on-site pressure meter, the wall surface of the inert gas chamber is provided with an air chamber pressure transmitter, an air chamber on-site pressure meter, a safety valve, an exhaust electric valve and an inspection manhole, and the inert gas chamber is communicated with a collecting connection box through the pipeline provided with an air, the collecting header is connected with the air supplementing bottle group through a high-pressure hose, a stokehole fuel pressure transmitter is arranged on a pipeline between the stokehole electric valve and the stokehole fuel system, the stokehole fuel pressure transmitter, the air bag pressure transmitter and the air chamber pressure transmitter are respectively connected with the automatic control cabinet through cables, and the automatic control cabinet is used for controlling the starting or stopping of the oil pump.

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