CN111536547A - Spring type self-stabilizing device for fuel oil system - Google Patents
Spring type self-stabilizing device for fuel oil system Download PDFInfo
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- CN111536547A CN111536547A CN202010383227.4A CN202010383227A CN111536547A CN 111536547 A CN111536547 A CN 111536547A CN 202010383227 A CN202010383227 A CN 202010383227A CN 111536547 A CN111536547 A CN 111536547A
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- oil
- fuel
- storage tank
- tank
- oil tank
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K5/00—Feeding or distributing other fuel to combustion apparatus
- F23K5/02—Liquid fuel
- F23K5/04—Feeding or distributing systems using pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K5/00—Feeding or distributing other fuel to combustion apparatus
- F23K5/02—Liquid fuel
- F23K5/14—Details thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K5/00—Feeding or distributing other fuel to combustion apparatus
- F23K5/02—Liquid fuel
- F23K5/14—Details thereof
- F23K5/142—Fuel pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K5/00—Feeding or distributing other fuel to combustion apparatus
- F23K5/02—Liquid fuel
- F23K5/14—Details thereof
- F23K5/147—Valves
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Feeding And Controlling Fuel (AREA)
Abstract
The invention discloses a spring type self-stabilizing device for a fuel oil system, which comprises an oil tank and an oil storage tank, wherein 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 stokehole fuel oil system through a stokehole electric valve, the other path of the outlet of the check valve is connected with the bottom of the oil storage tank through a fuel oil tank electric valve, a stokehole fuel oil pressure transmitter is arranged on the pipeline between the stokehole electric valve and the stokehole fuel oil system, the stroke switch, the high liquid level sensor, the low liquid level sensor, the fuel oil tank pressure transmitter, the oil pump, the fuel oil tank electric valve, the stokehole electric valve and the stokehole fuel oil pressure transmitter are respectively connected with an automatic control cabinet through cables, and the automatic control cabinet is used for controlling the starting or. 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
Technical Field
The invention relates to the technical field of fuel oil systems of thermal power boilers, in particular to a spring type self-stabilizing device for a fuel oil system.
Background
When the thermal power boiler is in an emergency state (for example, a critical device fails) or runs at a low load, an oil gun needs to be put into use for stable combustion, so that a fuel oil system needs to be in a standby state at any time, and the oil pump needs to run for a long time. The oil pump supplies oil to two boilers at the same time, and the cumulative operating hours of the oil pump all the year round exceed 6000 hours, but in reality, the cumulative operating time of the oil gun all the year round is within 200 hours on average, that is, 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 causes great waste of electric energy.
Aiming at the problem, the current power plant mainly adopts a method of oil pump frequency conversion modification to reduce the power consumption. Although the method can save a part of electric energy, the oil pump cannot be completely stopped, and still has larger energy consumption.
Disclosure of Invention
In order to solve the defects and shortcomings of the prior art, the spring type self-stabilizing device for the fuel oil system is provided, the principle is advanced, the structure is simple, the device can enable the oil pressure of the fuel oil system in front of a boiler to be automatically stabilized at a design value under the condition that an oil pump stops running and any energy is not consumed, the requirement for combustion supporting of an oil gun can be met at any time, the requirement for the pressure and the flow of combustion supporting fuel oil can be met during the starting period of the oil pump (generally, the time is not more than 20 minutes), the purpose that the oil pump does not need to be started in the normal running stage of a boiler and is started only when oil is required to be thrown is achieved, a large amount of electricity consumption of the oil pump can be saved, the service life of the oil pump is prolonged, and.
The invention provides a spring type self-stabilizing device for a fuel oil system, which comprises an oil tank and an oil storage tank, wherein 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 stokehole fuel oil system through a stokehole electric valve, the other path of the outlet of the check valve is connected with the bottom of the oil storage tank through a fuel oil tank electric valve, a stokehole fuel oil pressure transmitter is arranged on the pipeline between the stokehole electric valve and the stokehole fuel oil system, a piston is movably arranged in the oil storage tank, the piston is hermetically connected with the oil storage tank through an O-shaped ring, an upper limit block and a lower limit block which are used for limiting the position of the piston are symmetrically arranged at two sides of the inner wall of the oil storage tank, a travel switch, a high liquid level sensor and a low liquid level sensor are, the outer wall both sides of batch oil tank are provided with batch oil tank pressure transmitter, batch oil tank manometer on the spot respectively in the below of stopper down, travel switch, high level sensor, low level sensor, batch oil tank pressure transmitter, oil pump, batch oil tank motorised valve, stokehold fuel oil pressure transmitter all are connected with the automatic control cabinet through the cable separately, and the automatic control cabinet is used for controlling the start-up or the stop of oil pump to and control opening or closing of batch oil tank motorised valve and stokehold motorised valve, the even welding of the upper surface of piston has a plurality of fixed cover, be provided with high strength spring in the fixed cover, high strength spring's external diameter slightly is less than the internal diameter of fixed cover to high strength spring's lower extreme and the last surface direct contact of piston, porous mounting panel has been arranged to fixed cover top, the equipartition has a plurality of, threaded connection has the pressure regulating bolt in the mounting hole, the lower extreme of pressure regulating bolt stretches in the fixed cover, with high strength spring upper end butt, the outside and the original spandrel girder welded connection of boiler of porous mounting panel.
The invention has the beneficial effects that:
compared with the prior art, the method has the advantages that,
1. the invention can automatically store a certain amount of pressurized fuel oil in the oil storage tank by using the oil pump. The automatic oil filling process can be described as follows: when the low liquid level sensor can not detect the liquid level, sending a signal of insufficient oil storage of the oil storage tank to the automatic control cabinet, firstly detecting and ensuring that an electric valve of the oil storage tank is in an open position by the automatic control cabinet, and then starting an oil pump to start to fill oil into the oil storage tank; when the high liquid level sensor detects the liquid level, a signal of 'full oil in the oil storage tank' is sent to the automatic control cabinet, the automatic control cabinet stops the operation of the oil pump, the oil filling process is finished, then the furnace front electric valve is detected and ensured to be in an open state, and the pressure of the furnace front fuel oil system is kept to meet the design requirement by using the high-pressure fuel oil stored in the oil storage tank. Meanwhile, the check valve is arranged at the outlet of the oil pump, so that the fuel oil in the oil storage tank cannot flow back to the oil tank when the oil pump stops running.
2. The oil pump of the invention can be in a stop state in the normal operation stage of the boiler (namely when oil is not required to be added), because the oil storage tank stores the oil consumption required by meeting the oil adding and combustion supporting of the boiler during the starting period of the oil pump. The working process can be described as follows: when the boiler normally operates, the oil pump stops operating; when the boiler has an emergency (such as some equipment faults) and needs to be charged with oil for combustion supporting, firstly, the boiler is stably combusted by using the fuel oil stored in the oil storage tank, and the oil pump is started. Therefore, the fuel oil stored in the oil storage tank can meet the oil consumption required during the starting of the oil pump, sufficient time is strived for starting the oil pump, and therefore the oil pump can be in a stop state when oil is not required to be thrown and combustion is supported, and the power consumption of the oil pump and the loss of the oil pump are greatly reduced.
3. The invention can utilize the high-strength spring to automatically stabilize the oil pressure of the fuel oil system in front of the furnace at a design value. Can be described as: a plurality of groups of high-strength springs are uniformly arranged between the porous mounting plate and the piston, and when the springs are compressed, huge elastic force is generated, and the elastic force acts on fuel in the fuel storage tank through the piston to increase the pressure of the fuel. The compression amount of the springs can be adjusted through the pressure regulating bolts, when the pressure regulating bolts are screwed downwards, the generated elastic force is increased, the oil pressure is increased along with the generated elastic force, and when the pressure regulating bolts are withdrawn upwards, the generated elastic force of the springs is reduced, and the oil pressure is reduced along with the generated elastic force. Therefore, the oil pressure in the oil storage tank can meet the actual requirement by adjusting the position of the pressure regulating bolt.
4. In the combustion-supporting process of the oil storage tank, the oil pressure in the oil storage tank is changed within a certain range. This is because: the oil pressure in the oil reservoir is generated by the elastic force of a plurality of sets of high-strength springs, and the elastic force of the springs is related to the compression amount of the springs. When the level of fuel in the reservoir is at a high level, the spring is compressed the most, and the oil pressure generated is the highest, and when the level of fuel in the reservoir is at a minimum, the spring is compressed the least, and the oil pressure generated is also the lowest. Therefore, the oil pressure in the oil reservoir changes with the change in the liquid level. In order to make the oil pump smoothly fill the fuel to the high level of the oil storage tank, the pressure generated by the spring at the high level should be lower than the oil pressure generated when the oil pump delivers the fuel to the oil storage tank, and the oil pressure at the high level is usually between 1.0MPa and 2.0MPa in view of reducing the cost of the spring and prolonging the service life of the spring. The oil pressure at low level is usually set according to the atomization mode of the oil gun used by the user, and is usually between 0.5MPa and 1.0 MPa.
5. The invention can meet the actual use requirement by utilizing the oil pressure generated by the high-strength spring. Can be explained as follows: among various oil guns, a purely mechanical oil gun requires the highest oil pressure, and normally requires an oil pressure of 2.0MPa or more in cold use. Although the oil pressure generated by the invention at a low liquid level is lower, usually about 0.5MPa-1.0MPa, the invention is only put into use when oil is put into the boiler and the combustion is stable in the operation process of the boiler, the combustion temperature in the boiler is above 1000 ℃, and the ignition temperature of diesel oil is about 250 ℃, so that the extremely high temperature in the boiler can sufficiently compensate the problem of poor atomization effect caused by the reduction of the oil pressure. When the boiler is started in cold state, the oil pump supplies oil directly to the oil gun. Therefore, by comprehensively considering the factors, the invention can meet the requirements of oil injection and stable combustion of various oil guns including mechanical oil guns.
6. The oil storage tank of the invention can meet the actual requirement only by a small volume, and can be described as that two oil guns are usually required to be put into combustion supporting under the emergency condition of a boiler, the output of each oil gun is about 1 ton/hour, the starting time of an oil pump from starting to normal operation is about 20 minutes, and the density of fuel oil is about 0.85 × 103Kilogram/m3Therefore, the required fuel volume flow during the start of the oil pump is 2 × 1 × (20/60)/(0.85 × 10)3)≈0.79m3. The effective volume in the reservoir (i.e. the volume between the lower surface of the piston and the upper surface of the lower stop block) need only be greater than 0.79m3The actual need can be met. The volume of the reservoir is therefore relatively small.
7. The self-voltage stabilizer has perfect functions. The expression is as follows:
(1) the oil storage tank is provided with the high liquid level sensor and the low liquid level sensor, so that the automatic oil filling process of the oil storage tank can be automatically completed.
(2) In the process that the oil pump feeds the fuel oil into the oil storage tank, in order to prevent the piston from being ejected out of the oil storage tank by the fuel oil in the oil storage tank under the condition that the high liquid level sensor and the low liquid level sensor are damaged, the invention is provided with the upper limit block at the top of the oil storage tank, when the piston rises to be in contact with the upper limit block, the piston cannot rise further under the limit of the upper limit block, thereby avoiding the accident that the piston is ejected out of the oil storage tank by the fuel oil, and simultaneously, when the piston is in contact with the upper limit block, the travel switch is closed, a signal is given to the automatic control cabinet, and the automatic control cabinet gives a 'high liquid level device fault' alarm signal to remind related personnel to process.
(3) According to the principle of physics that pressure F is pressure P multiplied by force bearing area S, when the lower part of the oil storage tank has no lower limit block, the piston is tightly pressed on the bottom of the oil storage tank under the action of the gravity assembly, and the fuel oil pushes up the piston upwards to obtain the required fuel oil pressure P1 which is spring force F/cross-sectional area of the oil delivery pipe S1; when the lower limiting block is arranged at the lower part of the oil storage tank, the piston is supported by the lower limiting block, and the fuel pressure P2 required by the upward jacking of the piston by the fuel is equal to the spring force F/the cross-sectional area S2; obviously, under the condition that the spring force F is the same, since S2> S1, P2< P1. Therefore, on the premise that the lower limit block is arranged in the oil storage tank, the oil pump can jack the piston only by a small lift, which is very important under the condition that the diameter of the oil storage tank is larger. Therefore, the oil pump lift, the diameter of the oil delivery pipe, the diameter of the oil storage tank and the elastic force of the spring are matched and calculated, so that the oil storage tank can be ensured to jack the piston easily by fuel oil when the oil storage tank is filled with the oil, and the whole oil filling process is completed smoothly.
(4) And two O-shaped rings are adopted for sealing between the piston and the oil storage tank, so that the sealing reliability is improved, and the oil leakage phenomenon is prevented.
(5) The fixed sleeve is uniformly welded on the upper surface of the piston, and the springs are all arranged in the fixed sleeve, so that the phenomena of spring inclination or damage and the like caused by stress deflection are effectively prevented, and the spring can be well protected.
8. The invention can realize automatic adjustment of the whole system by utilizing the automatic control cabinet, the electric valve and the like. The main control logic steps are as follows:
the method comprises the following steps that firstly, when a boiler is in a normal operation state (at the moment, oil feeding and stable combustion are not needed), an oil pump is in a stop state, an electric valve of an oil storage tank and an electric valve in front of the boiler are opened, and the standby requirement of a fuel oil system is met by utilizing pressurized fuel oil stored in the oil storage tank.
And secondly, when the boiler needs to be fed with oil and stably combusted, firstly utilizing the fuel oil in the oil storage tank to support combustion of the boiler, starting the oil pump, automatically closing an electric valve of the oil storage tank after the oil pump runs normally, and switching the fuel oil system to a stage of supplying oil from the oil pump to support combustion.
And thirdly, when the boiler combustion supporting is finished, keeping the oil pump to continuously operate, automatically closing the furnace front electric valve, opening the oil storage tank electric valve, filling fuel oil into the oil storage tank, and stopping the oil pump from operating after a high liquid level sensor gives a signal of 'oil storage tank is full of oil'.
And fourthly, automatically opening the electric valve in front of the furnace, and enabling the fuel system to enter a standby state to complete a cycle.
Drawings
The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings, in which:
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
As shown in fig. 1, the fuel tank comprises an oil tank 1 and a fuel storage tank 10, wherein the oil tank 1 is sequentially connected with an oil pump 2 and a check valve 3 through a pipeline, one path of an outlet of the check valve 3 is connected with a stokehole fuel system 7 through a stokehole electric valve 5, the other path of the outlet is connected with the bottom of the fuel storage tank 10 through a fuel storage tank electric valve 4, a stokehole fuel pressure transmitter 6 is arranged on the pipeline between the stokehole electric valve 5 and the stokehole fuel system 7, a piston 14 is movably arranged in the fuel storage tank 10, the piston 14 is hermetically connected with the fuel storage tank 10 through an O-ring 13, an upper limit block 15 and a lower limit block 11 for limiting the position of the piston 14 are symmetrically arranged on two sides of the inner wall of the fuel storage tank 10, a travel switch 21, a high liquid level sensor 22 and a low liquid level sensor 9 are sequentially arranged on the outer, the utility model discloses a fuel tank, including the outer wall both sides of batch oil tank 10 be provided with batch oil tank pressure transmitter 8, batch oil tank manometer 12 on the spot respectively in the below of stopper 11 down, travel switch 21, high level sensor 22, low level sensor 9, batch oil tank pressure transmitter 8, oil pump 2, batch oil tank motorised valve 4, stokehold motorised valve 5, stokehold fuel pressure transmitter 6 all are connected with automatic control cabinet 23 through the cable separately, and automatic control cabinet 23 is used for controlling the start-up or the stop of oil pump 2 to and control opening or closing of batch oil tank motorised valve 4 and stokehold motorised valve 5, the even welding of upper surface of piston 14 has a plurality of fixed cover 18, be provided with high strength spring 16 in the fixed cover 18, the external diameter of high strength spring 16 slightly is less than the internal diameter of fixed cover 18 to the lower extreme of high strength spring 16 and the upper surface direct contact of piston 14, porous, the equipartition has a plurality of to process the mounting hole that has the internal screw thread on the porous mounting panel 20, threaded connection has pressure regulating bolt 19 in the mounting hole, in fixed cover 18 was stretched to pressure regulating bolt 19's lower extreme, with 16 upper end butts of high strength spring, the outside and the former spandrel girder 17 welded connection of boiler of porous mounting panel 20.
The above embodiments are not limited to the technical solutions of the embodiments themselves, and the embodiments may be combined with each other into a new embodiment. The above embodiments are only for illustrating the technical solutions of the present invention and are not limited thereto, and any modification or equivalent replacement without departing from the spirit and scope of the present invention should be covered within the technical solutions of the present invention.
Claims (1)
1. A spring type self-stabilizing device for a fuel system is characterized in that: including oil tank, batch oil tank, the oil tank has connected gradually oil pump, check valve through the pipeline, check valve's export is crossed stokehold motorised valve and is connected with stokehold fuel oil system all the way, another way pass the batch oil tank motorised valve with the batch oil tank bottom is connected, is provided with stokehold fuel pressure transmitter on the pipeline between stokehold motorised valve and stokehold fuel oil system, the batch oil tank internalization is provided with the piston, pass through O type circle sealing connection between piston and the batch oil tank, batch oil tank inner wall both sides symmetry is provided with and is used for restricting last spacing piece, the lower spacing piece of piston position, the outer wall of batch oil tank has set gradually travel switch, high level sensor, low level sensor between last spacing piece, the lower spacing piece from top to bottom, the outer wall both sides of batch oil tank are provided with batch oil tank pressure transmitter respectively under the spacing, The oil storage tank manometer on spot, travel switch, high level sensor, low level sensor, oil storage tank pressure transmitter, oil pump, oil storage tank motorised valve, stokehole fuel pressure transmitter all are connected with the automatic control cabinet through the cable separately, and the automatic control cabinet is used for controlling the start-up or the stop of oil pump to and the opening or closing of control oil storage tank motorised valve and stokehole motorised valve, the even welding of upper surface of piston has a plurality of fixed cover, be provided with high strength spring in the fixed cover, high strength spring's external diameter slightly is less than the internal diameter of fixed cover, and high strength spring's lower extreme and the upper surface direct contact of piston, porous mounting panel has been arranged to fixed cover top, the equipartition has a plurality of to process threaded mounting hole on the porous mounting panel, threaded connection has the pressure regulating bolt in the mounting hole, and the outer side of the porous mounting plate is connected with the original bearing beam of the boiler in a welding manner.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010383227.4A CN111536547B (en) | 2020-05-08 | 2020-05-08 | Spring type self-stabilizing device for fuel oil system |
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| CN202010383227.4A CN111536547B (en) | 2020-05-08 | 2020-05-08 | Spring type self-stabilizing device for fuel oil system |
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| CN111536547B CN111536547B (en) | 2021-05-14 |
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Cited By (2)
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| CN112664972A (en) * | 2020-12-29 | 2021-04-16 | 山西大学 | Pendulum type sealing device for rotary air preheater of thermal power boiler |
| CN113090949A (en) * | 2021-04-12 | 2021-07-09 | 中国大唐集团科学技术研究院有限公司华东电力试验研究院 | Boiler fuel pressure stabilizing system |
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| CN111536547B (en) | 2021-05-14 |
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