CN113266764A - Natural gas pressure regulating station and method for supercritical circulating fluidized bed boiler gas supply - Google Patents
Natural gas pressure regulating station and method for supercritical circulating fluidized bed boiler gas supply Download PDFInfo
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- CN113266764A CN113266764A CN202110419159.7A CN202110419159A CN113266764A CN 113266764 A CN113266764 A CN 113266764A CN 202110419159 A CN202110419159 A CN 202110419159A CN 113266764 A CN113266764 A CN 113266764A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
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Abstract
The invention relates to a natural gas pressure regulating station and a method for supplying gas to a supercritical circulating fluidized bed boiler, belonging to the technical field of natural gas application. The invention comprises an inlet main pipe, a filtering and metering unit, a pressure regulating unit, a diffusing unit, an odorizing unit, an outlet main pipe and a sewage disposal pool, wherein the inlet main pipe is connected with the filtering and metering unit, the filtering and metering unit is connected with the pressure regulating unit and the sewage disposal pool, the pressure regulating unit is connected with the outlet main pipe, the inlet main pipe, the filtering and metering unit, the pressure regulating unit and the outlet main pipe are all connected with the diffusing unit, and the odorizing unit is connected with the outlet main pipe. The natural gas pressure regulating station is qualified in trial operation, smoothly passes through the whole set of start trial operation of the unit and the examination of loads at all stages, is stable and reliable in operation, has accurate pressure regulation of the pressure regulating unit, stable gas filtration of the filtering and metering unit, small difference value of inlet and outlet pressures and normal pollution discharge.
Description
Technical Field
The invention relates to a natural gas pressure regulating station and a method for supplying gas to a supercritical circulating fluidized bed boiler, belonging to the technical field of natural gas application.
Background
The Circulating Fluidized Bed (CFB) is one of the internationally recognized clean coal technologies with the best commercialization degree, has wide fuel application, and can burn and use various conventional coals and inferior fuels such as petroleum coke, coal gangue and the like. The supercritical circulating fluidized bed boiler (CSCFB) has the advantages of both the circulating fluidized bed combustion technology and the supercritical parameter steam circulation, is a new generation circulating fluidized bed combustion technology, has low initial investment and operation cost for flue gas purification, is a high-efficiency clean coal technology suitable for mass popularization, and has rapid development at home and abroad. However, the CSCFB boilers put into production at home and abroad are only used for power generation and heat supply, and no double-backpressure pure steam supply unit exists, so that no related technology is put into production or implemented at home and abroad for the problem of natural gas supply of the CSCFB double-backpressure steam supply unit.
In view of this, patent document No. 201410050802.3 discloses a natural gas pressure regulating station system, and patent document No. 201821800984.1 discloses a compressed natural gas pressure regulating station.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a natural gas pressure regulating station and a method for supplying gas to a supercritical circulating fluidized bed boiler, which have reasonable structural design.
The technical scheme adopted by the invention for solving the problems is as follows: this a natural gas pressure regulating station for supercritical circulating fluidized bed boiler air feed, its structural feature lies in: the device comprises an inlet main pipe, a filtering and metering unit, a pressure regulating unit, a diffusing unit, an odorizing unit, an outlet main pipe and a sewage disposal pool, wherein the inlet main pipe is connected with the filtering and metering unit, the filtering and metering unit is connected with the pressure regulating unit and the sewage disposal pool, the pressure regulating unit is connected with the outlet main pipe, the inlet main pipe, the filtering and metering unit, the pressure regulating unit and the outlet main pipe are all connected with the diffusing unit, and the odorizing unit is connected with the outlet main pipe;
the filtering and metering unit comprises a filtering and metering pipeline, a filtering and metering bypass, a filter differential pressure gauge and a filter liquid level gauge, wherein the filtering and metering pipeline is sequentially provided with an electric overpressure stop valve, a filter, a rectifier, an ultrasonic flowmeter and an electric overpressure stop valve;
the pressure regulating unit comprises a pressure regulating pipeline, an electric overpressure stop valve, a pressure gauge, an electromagnetic valve, a pressure regulator, a pressure gauge and a manual ball valve are sequentially arranged on the pressure regulating pipeline, a throttling check valve is respectively arranged on a bypass of the electric overpressure stop valve and a bypass of the pressure regulating pipeline, the filtering and metering unit is connected with the pressure regulating pipeline, the pressure regulating pipeline is connected with an outlet main pipe, and a nitrogen charging port is arranged on the pressure regulating pipeline;
the diffusing unit comprises a first diffusing pipeline, a second diffusing pipeline, a first diffusing port, a second diffusing port and a diffusing pipe, the inlet main pipe and the filtering and metering unit are connected with the first diffusing pipeline, the first diffusing pipeline is connected with the first diffusing port, the pressure regulating unit and the outlet main pipe are connected with the second diffusing pipeline, the second diffusing pipeline is connected with the second diffusing port, the first diffusing port and the second diffusing port are connected with the diffusing pipe, and the first diffusing pipeline and the second diffusing pipeline are respectively provided with a throttling check valve;
the odorizing unit comprises an odorizing pipeline, a photoelectric switch, a filtering tank, a metering tank and an odorizing liquid level meter, one end of the odorizing pipeline is connected with an outlet female pipe, the other end of the odorizing pipeline is connected with the photoelectric switch and the metering tank, the filtering tank and the odorizing liquid level meter are connected with the metering tank, and a water pump is connected between the photoelectric switch and the filtering tank.
Furthermore, an insulating joint, a manual ball valve and an electric overpressure stop valve are sequentially arranged on the inlet main pipe, a throttling check valve is arranged on a bypass of the electric overpressure stop valve, the inlet main pipe is connected with the filtering and metering unit, and a nitrogen charging port is arranged on the inlet main pipe.
Further, install electronic superpressure trip valve, manual ball valve and insulating joint on the female pipe of export in proper order, install the throttle check valve on the bypass of electronic superpressure trip valve, the pressure regulating unit is connected with the female pipe of export, be provided with on the female pipe of export and fill the nitrogen mouth.
Furthermore, the number of the filtering metering units and the number of the pressure regulating units are two, one filtering metering unit is a common filtering metering unit, the other filtering metering unit is a standby filtering metering unit, one pressure regulating unit is a common pressure regulating unit, and the other pressure regulating unit is a standby pressure regulating unit.
Further, another technical object of the present invention is to provide a method of operating a natural gas pressure regulating station for supplying gas to a supercritical circulating fluidized bed boiler.
The technical purpose of the invention is realized by the following technical scheme.
A working method of a natural gas pressure regulating station for supplying gas to a supercritical circulating fluidized bed boiler is characterized in that: before the natural gas pressure regulating station is put into operation, the work such as checking and accepting a valve, an inlet main pipe, a filtering and metering unit, a pressure regulating unit, a diffusing unit, an odorizing unit, an outlet main pipe tightness test, gas replacement and the like needs to be finished, and the operation method of the gas replacement is as follows: closing the electric overpressure stop valve and a throttling check valve of a bypass thereof; opening a manual ball valve arranged in nitrogen, opening a safety valve, slowly opening a throttling check valve of a safety valve bypass, and controlling the boosting speed to be not more than 0.2MPa/min to sample from a first bleeding hole; observing the pressure displayed by the pressure gauge, and repeatedly and slowly opening a throttling check valve of a next safety valve bypass when the pressure does not rise any more, so that the operation is repeated until a pipeline system of the natural gas pressure regulating station is filled with nitrogen and the oxygen content in the diffused mixed gas reaches below 1% (volume content); and after the oxygen content in the diffused sample gas meets the requirement, closing the nitrogen displacement electric overpressure stop valve and the safety valve.
Further, the step of feeding the natural gas into the pipeline of the natural gas pressure regulating station comprises the following steps: slowly opening the electric overpressure stop valve and a bypass throttling check valve, and controlling the boosting speed to be not more than 0.3 MPa/min; observing the pressure displayed by the pressure gauge, and closing the throttling check valve of the bypass when the pressure does not rise any more; then repeatedly and slowly opening the throttling check valve and the manual ball valve of the next bypass, and closing the throttling check valve of the bypass when the pressure does not rise any more; and repeating the steps until the pipeline of the natural gas pressure regulating station is filled with natural gas.
Furthermore, the design pressure of the pipeline before pressure is 2.0MPa, the design pressure of the pipeline after pressure regulation is 0.4MPa, and the equipment is ensured that the processing capacity reaches 44000Nm when the lowest station entering pressure is reached3/h。
Compared with the prior art, the invention has the following advantages: the natural gas pressure regulating station is qualified in trial operation, smoothly passes through the whole set of start trial operation of the unit and the examination of loads at all stages, is stable and reliable in operation, has accurate pressure regulation of the pressure regulating unit, stable gas filtration of the filtering and metering unit, small difference value of inlet and outlet pressures and normal pollution discharge. The combustible gas detection device has high detection sensitivity and accurate alarm. The deodorizing device can meet the requirement of natural gas flow. All indexes meet the design requirements. The natural gas pressure regulating station is the first natural gas pressure regulating station for supplying steam to the CSCFB boiler double-backpressure unit, provides effective guarantee for stable steam supply of the unit, and has high practical significance and engineering value.
Drawings
Fig. 1 is a schematic structural diagram of a natural gas pressure regulating station according to an embodiment of the present invention.
FIG. 2 is a schematic structural view of an inlet header according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a filtering and metering unit according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a voltage regulating unit according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a diffusing unit according to an embodiment of the present invention.
Fig. 6 is a schematic structural view of an odorizing unit according to an embodiment of the present invention.
FIG. 7 is a schematic structural view of an outlet header according to an embodiment of the present invention.
In the figure: an inlet main pipe A, a filtering and metering unit B, a pressure regulating unit C, a diffusing unit D, an odorizing unit E, an outlet main pipe F, a sewage disposal pool G,
A filtering metering pipeline B1, a filtering metering bypass B2, a filter differential pressure gauge B3, a filter liquid level gauge B4,
A pressure regulating pipeline C1,
A first diffusing pipeline D1, a second diffusing pipeline D2, a first diffusing port D3, a second diffusing port D4, a diffusing pipe D5,
Odorizing pipeline E1, photoelectric switch E2, filter tank E3, metering tank E4, odorizing liquid level meter E5,
The device comprises a manual ball valve 1, a filter 2, a pressure regulator 3, a safety valve 4, a throttling check valve 5, an electric overpressure cut-off valve 6, an ultrasonic flowmeter 7, an electromagnetic valve 8, an insulating joint 9, a rectifier 10, a pressure gauge 11 and a water pump 12.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Examples are given.
Referring to fig. 1 to 7, it should be understood that the structures, ratios, sizes, and the like shown in the drawings attached to the present specification are only used for matching the disclosure of the present specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the function and the achievable purpose of the present invention. In the present specification, the terms "upper", "lower", "left", "right", "middle" and "one" are used for clarity of description, and are not used to limit the scope of the present invention, and the relative relationship between the terms and the relative positions may be changed or adjusted without substantial technical changes.
A natural gas pressure regulating station for supercritical circulating fluidized bed boiler air feed in this embodiment, including female pipe A of import, filter metering unit B, pressure regulating unit C, diffuse unit D, add smelly unit E, female pipe F of export and blowdown pond G, female pipe A of import is connected with filter metering unit B, filter metering unit B and pressure regulating unit C and blowdown pond G are connected, pressure regulating unit C is connected with female pipe F of export, female pipe A of import, filter metering unit B, pressure regulating unit C and female pipe F of export all are connected with diffuse unit D, it is connected with female pipe F of export to add smelly unit E.
The inlet main pipe A in the embodiment is sequentially provided with an insulating joint 9, a manual ball valve 1 and an electric overpressure stop valve 6, a bypass of the electric overpressure stop valve 6 is provided with a throttling check valve 5, the inlet main pipe A is connected with a filtering and metering unit B, and the inlet main pipe A is provided with a nitrogen charging port.
The filtering and metering unit B in the embodiment comprises a filtering and metering pipeline B1, a filtering and metering bypass B2, a filter differential pressure gauge B3 and a filter liquid level gauge B4, wherein an electric overpressure stop valve 6, a filter 2, a rectifier 10, an ultrasonic flowmeter 7 and an electric overpressure stop valve 6 are sequentially installed on the filtering and metering pipeline B1, a throttling check valve 5 is installed on a bypass of the electric overpressure stop valve 6, the filtering and metering bypass B2 is connected with a filtering and metering pipeline B1, a manual ball valve 1, a filter differential pressure gauge B3 and a manual ball valve 1 are sequentially installed on the filtering and metering bypass B2, a filter liquid level gauge B4 is installed on the filter 2, the filter 2 is connected with a sewage disposal pool G, an inlet main pipe A is connected with the filtering and metering pipeline B1, a filtering and metering pipeline B1 is connected with a pressure regulating unit C, and a nitrogen charging port is arranged on the filtering and metering pipeline B1.
Pressure regulating unit C in this embodiment includes pressure regulating pipeline C1, install electronic superpressure trip valve 6 on the pressure regulating pipeline C1 in proper order, manometer 11, solenoid valve 8, voltage regulator 3, manometer 11 and manual ball valve 1, respectively install a throttle check valve 5 on the bypass of electronic superpressure trip valve 6 and pressure regulating pipeline C1, filter metering unit B and pressure regulating pipeline C1 and be connected, pressure regulating pipeline C1 is connected with female pipe F in the export, be provided with on the pressure regulating pipeline C1 and fill the nitrogen mouth.
The diffusing unit D in the embodiment comprises a first diffusing pipeline D1, a second diffusing pipeline D2, a first diffusing port D3, a second diffusing port D4 and a diffusing pipe D5, an inlet main pipe A and a filtering metering unit B are both connected with the first diffusing pipeline D1, a first diffusing pipeline D1 is connected with the first diffusing port D3, a pressure regulating unit C and an outlet main pipe F are both connected with the second diffusing pipeline D2, a second diffusing pipeline D2 is connected with the second diffusing port D4, a first diffusing port D3 and a second diffusing port D4 are both connected with the diffusing pipe D5, and a throttling check valve 5 is respectively installed on the first diffusing pipeline D1 and the second diffusing pipeline D2.
The odorizing unit E in the embodiment comprises an odorizing pipeline E1, a photoelectric switch E2, a filter tank E3, a metering tank E4 and an odorizing liquid level meter E5, one end of the odorizing pipeline E1 is connected with an outlet main pipe F, the other end of the odorizing pipeline E1 is connected with the photoelectric switch E2 and the metering tank E4, the filter tank E3 and the odorizing liquid level meter E5 are both connected with the metering tank E4, and a water pump 12 is connected between the photoelectric switch E2 and the filter tank E3.
An electric overpressure stop valve 6, a manual ball valve 1 and an insulating joint 9 are sequentially installed on an outlet main pipe F in the embodiment, a throttling check valve 5 is installed on a bypass of the electric overpressure stop valve 6, a pressure regulating unit C is connected with the outlet main pipe F, and a nitrogen charging opening is formed in the outlet main pipe F.
The number of the filtering metering units B and the number of the pressure regulating units C in this embodiment are both two, one of the filtering metering units B is a common filtering metering unit, the other filtering metering unit B is a standby filtering metering unit, and one of the pressure regulating units C is a common pressure regulating unit and the other pressure regulating unit C is a standby pressure regulating unit.
The working method of the natural gas pressure regulating station for supplying gas to the supercritical circulating fluidized bed boiler in the embodiment is as follows, the natural gas pressure regulating station needs to complete the work of checking and accepting the valve, the inlet main pipe A, the filtering and metering unit B, the pressure regulating unit C, the diffusing unit D, the odorizing unit E, the outlet main pipe F tightness test, gas replacement and the like before being put into operation, and the operation method of the gas replacement is as follows: closing the electric overpressure stop valve 6 and the bypass throttling check valve 5 thereof; opening a manual ball valve 1 arranged in nitrogen, opening a safety valve 4, slowly opening a throttling check valve 5 of a bypass of the safety valve 4, and controlling the boosting speed to be not more than 0.2MPa/min to sample from a first bleeding opening D3; observing the pressure displayed by the pressure gauge 11, when the pressure does not rise any more, repeatedly and slowly opening the throttling check valve 5 of the bypass of the next safety valve 4, and repeating the steps until the pipeline system of the natural gas pressure regulating station is filled with nitrogen and the oxygen content in the diffused mixed gas reaches below 1% by volume; and after the oxygen content in the diffused sample gas meets the requirement, closing the nitrogen displacement electric overpressure stop valve 6 and the safety valve 4.
The step of feeding natural gas into the pipeline of the natural gas pressure regulating station in the embodiment is as follows: slowly opening an electric overpressure stop valve 6 and a bypass throttling check valve 5, and controlling the boosting speed to be not more than 0.3 MPa/min; observing the pressure displayed by the pressure gauge 11, and closing the throttling check valve 5 of the bypass when the pressure does not rise any more; then repeatedly and slowly opening the throttling check valve 5 of the next bypass and the manual ball valve 1, and closing the throttling check valve 5 of the bypass when the pressure does not rise any more; and repeating the steps until the pipeline of the natural gas pressure regulating station is filled with natural gas.
In this embodiment, the design pressure of the pipeline before pressure is 2.0MPa, the design pressure of the pipeline after pressure regulation is 0.4MPa, and the equipment is ensured that the processing capacity reaches 44000Nm when the lowest station entering pressure is reached3/h。
The natural gas of the natural gas pressure regulating station adopts medium petroleum pipeline gas as a gas source (the pressure of the inlet station is 0.8-1.6 MPa), and the natural gas is conveyed to the station, filtered, measured, regulated in pressure and conveyed to a downstream gas using point (the pressure of the outlet station is 0.35 MPa).
The filtering and metering unit B is composed of two filtering and metering pipelines B1 (one used and one spare), the equipment and parameters of the two filtering and metering pipelines B1 are completely the same and are formed by sequentially connecting equipment such as an electric overpressure stop valve 6, a filter 2, a rectifier 10, an ultrasonic flowmeter 7 and the like, the pipe diameter of the filtering and metering pipeline B1 is 400mm, and a sewage disposal pool G is arranged at the downstream of the filter 2 and used for periodic sewage disposal.
The pressure regulating unit C is composed of two pressure regulating pipelines C1 (one for one), the two pressure regulating pipelines C1 are completely identical in equipment and parameters and are formed by sequentially connecting equipment such as an electric overpressure cut-off valve 6, a pressure gauge 11, an electromagnetic valve 8, a pressure regulator 3, a throttling check valve 5 and the like, and the diameter of the pressure regulating pipeline C1 is 400 mm.
The odorizing unit E consists of an odorizing meter, an odorizing liquid level meter E5, a metering tank E4, a filtering tank E3, two water pumps 12 and a photoelectric switch E2, and is used for leakage early warning when the CFB boiler and the gas-fired boiler use gas.
The diffusing unit D consists of a diffusing port D3, a diffusing port D4 and a diffusing pipe D5, and an inlet main pipe A, a filtering metering pipeline B1, a pressure regulating pipeline C1 and an outlet main pipe F of the natural gas pressure regulating station are all connected with the diffusing pipe D5 and used for exhausting natural gas in emergency.
The inlet main pipe A and the outlet main pipe F of the natural gas pressure regulating station are composed of an electric overpressure stop valve 6, a throttling check valve 5, a manual ball valve 1, an insulating joint 9 and the like and are used for connecting natural gas pipelines outside and inside a plant.
Examples in the drawings of the specification are shown in the following table:
before the pressure regulating station is started, whether each valve is opened or closed according to the specified technological process requirement is checked; whether the security accessory is valid; whether the pipeline has leakage or not; whether the connection part is effectively connected and has no looseness.
When the pressure regulating station is started, the bleeding and sewage draining valves are closed, the electric overpressure stop valve before the inlet filter is slowly opened to inflate until the pressure is balanced, the reading of the pressure gauge before the pressure regulator is checked, the reading of the pressure gauge is close to the expected pressure value finally, then the electric overpressure stop valve before the outlet electric overpressure stop valve and the flowmeter is slowly opened to inflate the downstream pipeline of the outlet electric overpressure stop valve until the pressure is balanced, and finally, the outlet electric overpressure stop valve is slowly opened to inflate the downstream pipeline of the outlet electric overpressure stop valve until the pressure is balanced.
When the pressure regulating station is shut down, if the pressure regulator fails, the inlet and outlet electric overpressure stop valves of the pressure regulating path are closed, then the gas in the pressure regulating path is exhausted through the safety valve, and the pressure regulator can be maintained on line later. The set pressure of the pressure regulator and the cut-off valve of the standby pressure regulating road is adjusted to be the set value of the pressure regulating road to be maintained, the set pressure of the pressure regulator and the electric overpressure cut-off valve of the standby pressure regulating road is set to be the original value after the pressure regulating road is maintained, if all the emergency cut-off valves on the pressure regulating road are closed, the pressure regulating station stops supplying air, and if any one emergency cut-off valve is closed, the pressure regulating station is required to be maintained.
When the pressure regulating station operates, the noise level should be noticed, whether the gas smell exists or not and whether the gas leakage noise exists or not are judged, and if the gas leakage noise exists, the leakage detection is carried out; whether the threaded connection is loosened is noticed when a fault occurs or not; paying attention to the change of pressure and flow and making operation record; regularly discharging water to the filter, opening a ball valve at the bottom of the filter, discharging the water in the filter until the fuel gas is discharged, and closing the ball valve at the moment; and reading and recording the differential pressure meter on the filter, and if the black pointer of the differential pressure meter is superposed with the red pointer on the set position or the red pointer is driven to exceed the set position, indicating that the filter element is seriously blocked, and timely replacing the filter element.
The natural gas pressure regulating station system adopts a power plant identification system, is executed according to the KKS power plant identification system coding rule of China Hua Electricity group, meets the requirements of the identification system on the power plant identification system coding standard and the related requirements of GB/T50549-plus 2010 at the same time, is deep to the element level, and has the coding range including a natural gas pressure regulating station system, equipment, main parts, structures and the like.
The valves, flow meters, etc. in the system should meet or exceed current specifications and standard requirements. The most stringent specifications should be followed if several specifications and standards are applicable to the same situation. The pressure regulating station can ensure continuous normal operation without replacing parts within 3 years, does not need integral disassembly and maintenance within 10 years, and ensures the service life to be 30 years at least under the field condition. The materials of all equipment of the pressure regulating station are selected to be suitable for the environmental temperature and the process conditions, the materials of cast iron, semisteel or nodular cast iron cannot be used, and the materials of the pressure bearing parts of instruments or equipment particularly attract attention when the environmental temperature is lower than minus 25 ℃. The process piping of the pressure regulating station can ensure that the flow rate of the medium is not more than 20m/s, the type selection of the flowmeter ensures that the flow rate of the medium is not more than 25m/s, all electrical parts meet the requirements of field explosion prevention and protection grades, the explosion prevention grade is not lower than Exd IIBT4 Gb, and the protection grade is not lower than IP 65.
The pressure drop of the normal operation of the filtering equipment is lower than 0.015MPa, the service cycle of the filtering element is not less than 12 whole months, the material of the filter element is acetate fiber or polyester fiber, the pressure difference of 0.65MPa can be borne at least, the specified strength requirement and corrosion resistance requirement are met at the design temperature and the design pressure, and the filtering equipment is safe and reliable in use. The filter adopts a vertical type and flange opening mode, a drain outlet is arranged, and a manufacturer provides the filter and is provided with a differential pressure transmitter.
In the metering system, the gas ultrasonic flowmeter is a derivation type flowmeter for obtaining gas flow by measuring the propagation time of high-frequency sound pulses, the flowmeter measures the propagation time of the sound pulses propagating in the pipe along the oblique line direction along the downstream direction and the upstream direction, and the average axial flow speed and the gas volume flow of gas passing through the flowmeter under the working condition are calculated by using a digital technology. The highest design working pressure of the flowmeter is the lowest highest design working pressure of all pressure bearing components (such as a flowmeter shell, a flange, a sensor joint and the like). The material of all parts of the flowmeter, which are in contact with the natural gas, is made of a material suitable for the natural gas, and the material do not influence each other. The flowmeter is provided with two pressure taking points for measuring static pressure and used for connecting the pressure transmitter for pressure compensation, a pressure taking hole is provided with a pressure taking stop valve, the size of the valve is DN15, the connecting threads are 1/2 NPTF, and the pressure grade is greater than or equal to that of the flowmeter.
In the signal processing unit, the signal processing unit of the gas ultrasonic flowmeter takes a microprocessor as a core, and accurately, stably and reliably converts the flow of a measured medium into a standard high-frequency pulse signal, a digital signal (RS-485) and an analog signal (4-20mA), and the power supply of the signal processing unit is 24 VDC. The signal processing unit has the capability of simultaneously providing independent flow signals to two mutually independent flow computers (devices) so as to complete the checking function of flow calculation. For a dual flow application, a flow state output signal may be provided. The flow computer (device) referred to herein is installed in the control room. The signal processing unit has a small flow cut-off function, i.e. when the flow is below a minimum flow, the flow output is set to zero. The cable sheathing, rubber, plastic and other exposed parts of the gas ultrasonic flow meter are all resistant to ultraviolet light, flame, oils and grease. The signal processing unit has the capability of resetting system parameters, various constants, and a self-diagnostic function in the field.
The flow computer is an intelligent instrument based on a microprocessor, a 64-bit microprocessor is selected, and the capacities of a memory and a storage can meet the requirements of flow calculation and data storage. After the calculation standard of the flow computer is determined, the flow computer is not influenced by other calculation standards when working normally. The flow computer storage is used for archiving the flow every 15 minutes, at least can store data information such as accumulated flow, pressure, temperature and the like of not less than 30 days, and can display the gas instantaneous flow, accumulated flow and energy flow in a standard state and can display the accumulated flow of the previous hour, the previous day and the current day; meanwhile, the information such as working pressure, temperature, instrument working state and the like can be displayed. The flow computer is a non-explosion disk-mounted instrument which is arranged on a control room metering cabinet.
The flow calculation cabinet is of a steel structure, the height of each cabinet is 2100mm, the width of each cabinet is 800mm, the depth of each cabinet is 600mm, and the thickness of each steel plate is 3 mm. A steel double-door standard-size cabinet is selected, the door can be opened at 180 degrees, and a safety lock is arranged on the door. The cables/wires enter and exit from the bottom of the cabinet, and the wires in the cabinet pass through the wiring grooves. The cabinet is provided with heat dissipation, ventilation, illumination and other facilities, the air inlet is provided with a filter screen which is convenient to detach and replace, and the noise of the fan is not more than 40 dBA. The wiring in the cabinet adopts copper core wires or special cables, and the insulation voltage-resistant grade is 2 times of the rated voltage. The section area of the core of the signal cable is 0.75mm2The section area of the core of the power cable is 2.5mm2The cable/wire for transmitting analog signals, pulse signals and communication signals adopts a twisted pair shielding type. The signal lines and the power lines are distinguished by colors and are laid in grooves. The cage-type spring clamping type wiring terminal is adopted to connect cables/wires, the tensile force value of the wiring terminal is superior to the IEC60999 requirement, and the connection between the wiring terminals adopts a short-circuit piece. The electric connection with the external cable/wire adopts a wiring terminal, and the wiring terminal is provided with more than 30% of allowance. The insulation withstand voltage grade of the wiring terminal should not be less than 500V.
The design and manufacture of the odorizing device comply with the requirements of the relevant standard specifications. The steel plate can meet the specified strength requirement and corrosion resistance requirement at the design temperature and the design pressure, and is safe and reliable to use and convenient to check and maintain. The odorizing device has the function of manual and full-automatic mutual switching, the metering precision (%) is less than or equal to +/-5%, the odorizing agent is THT (tetrahydrothiophene), the strength calculation and structural design are carried out according to the regulation of GB150, analysis design or other tests such as stress test and the like are carried out, and the capacity of the odorizing agent storage tank is not less than 3 months of usage. The electrical part of the odorator meets the requirements of on-site explosion prevention and protection grade, wherein the explosion prevention grade is Exd II BT4, and the protection grade is IP 55.
The pressure of the odorizing agent output by the diaphragm metering pump is 1.0MPa higher than the highest working pressure of the gas pipeline. The plunger diaphragm metering pump is provided with a safety valve with stepless setting, the single stroke output flow of the safety valve can be adjusted, and a calibrator of the single stroke output is configured. The output frequency of the diaphragm metering pump can be controlled and adjusted by a control system, the stroke frequency is not lower than 100 times/second, the installation positions of the diaphragm metering pump and the electromagnetic valve are an explosive gas atmosphere dangerous area II, and the electrical explosion-proof grade is Exd II BT 4;
the odorizing agent storage tank is used under normal pressure, the design pressure of the odorizing agent storage tank is not lower than 0.1MPa, a breather valve or a device for avoiding overpressure and negative pressure in the tank is arranged, and a danger warning mark is marked according to the specification of CJJ/T148, so that the odorizing agent filling amount is not more than 90%, and the storage time is not more than the quality guarantee period of the odorizing agent;
the pressure regulator is an indirect self-operated pressure regulator, the connection form of the pipeline is flange connection, the flange is in the form of an integral flange, the pressure level system and the specification of the flange are respectively matched with the pressure level system and the specification of the pressure regulator and the cut-off valve, and the sealing surface of the flange is in the form of a convex surface (RF). The pressure regulator should be one-stage pressure regulating, the regulating range is 100% of the maximum flow, and the regulating characteristic in the range is linear.
The filter is used for removing impurities such as dust and the like in natural gas transportation, is arranged on the outdoor ground belonging to an explosion danger environment II area, and can meet the requirements that the filtering precision is less than or equal to 5 mu m, the filtering efficiency is 99 percent and the allowable pressure drop is less than or equal to 0.015MPa under the condition of working temperature of-20-60 ℃; the filter element of the filter is of a filtering basket type structure, and the natural gas inlet and outlet pipelines are on the same horizontal plane and have an angle of 180 degrees; the filter belt safety protection device is designed, manufactured and tested according to the standard execution GB150 and TSG R0004. The cylinder material is Q245R steel plate.
Ball valves are used for the shut-off of process lines. The design pressure is 2.0MPa, the process pipeline is cut off, the nominal pressure PN25 of the ball valve is selected, and the design and manufacture standard is 'pipeline valve technical condition' GB/T19672. The maximum allowable leakage rate reaches class A specified in GB/T13927. The valve body channel of the valve is full-bore, the static electricity leading-out function is realized between the valve body and the ball body, and the ball valve meets the use condition of full-differential opening and closing. The passageway of spheroid is circular, should guarantee that spheroid passageway and valve body passageway are at same axis when the ball valve is full open, and manual ball valve adopts the worm gear operation, and the handle has prevents the mistake installation function, and handle or hand wheel operating force are not more than 250N.
The safety valve is used for safely discharging media, the safety valve arranged on the high-pressure process pipeline is a pilot spring closed full-open type safety valve and is of a two-stage action type, the valve seat is provided with a recoil mechanism, and the safety valve arranged on the medium-pressure process pipeline is a spring full-open type safety valve. When the safety valve reaches a set value, the safety valve can quickly jump to release pressure, the precision between the jump pressure of the safety valve and the set value is +/-1%, and the precision of recoil pressure is 4% -6%;
the throttling stop emptying valve is used for manually emptying media, the blowdown valve is mainly used for blowdown in equipment maintenance and production processes, and has the functions of reliable stopping, blowdown and throttling; the valve core is provided with a balance hole to ensure that the opening and closing torque is smaller, the valve core is convenient and flexible to open, the valve core structure can realize automatic slag removal so as to ensure the cleanness of the outer edge of the valve core and the inner wall of the valve sleeve, and the valve rod is provided with a grease injection port.
The blowdown valve is a valve sleeve type blowdown valve, is reliable in sealing, resistant to scouring and good in blowdown performance, has a cavity blowdown function, and can be opened to clean dirt in the valve when necessary; metal and nonmetal double sealing is adopted to ensure the sealing performance; the valve can guarantee normal open and close under the maximum pressure difference operating mode, and the valve is fire-proof safe type, and valve hand wheel or spanner have the switch direction sign.
The process pipeline is connected by adopting a welding mode, and is connected with equipment by adopting a flange, the flange is in a convex surface welding neck flange, and the flange gasket is a metal winding gasket. The flange, the fastener and the sealing element meet the standard requirements of HG 20592-20614. The pipe welding is carried out according to the specification of GB 50184, and the welding seam interval is not less than 150 mm. Other technical requirements of construction and installation are implemented according to the specification of GB 50540. The process pipeline circumferential weld is subjected to 100% ultrasonic flaw detection and 100% ray flaw detection, and the quality of the weld respectively reaches the quality standards of grade I in GB 11345 and grade II in GB/T12605.
An explosion-proof lighting lamp is arranged in the prying body, the lamp and the control electrical appliance are provided by a manufacturer in a complete set, and the illumination can meet the field operation requirement.
The lightning protection measure of the sledge body meets the relevant requirements of the lightning protection standard of the second type of lightning protection buildings in GB50057, and the grounding setting of the sledge body meets the relevant requirements of the environment grounding of the explosive gas of GB 50058. All the joints of metal pipelines and pipe fittings which are not connected by welding, such as flange plates, are bridged by copper conductors, a grounding main line is arranged in the sledge body, metal shells of all devices and equipment are reliably connected with the grounding main line, and 3 grounding terminals connected with the sledge body are reserved in the grounding main line in different directions.
The scale unit of the temperature instrument adopts the temperature (DEG C), and the temperature instrument is installed in a welding sleeve mode. The in-situ thermometer is a bimetallic thermometer with a dial diameter of phi 100mm, universal type and precision not lower than 1.5 grade. The remote transmission temperature instrument selects a pt100 thermal resistor, the precision grade of a measuring element is A grade, an intelligent HART type transmitter is matched, a two-wire system 4-20mA standard signal is output, the precision grade is not lower than 0.2 grade, and a gauge head is provided with a liquid crystal for on-site display.
The pressure gauge installed on site is spring tube pressure gauge with dial diameter of phi 100mm and precision not lower than 1.0 level. The pressure/differential pressure transmitter adopts an intelligent HART type, outputs a two-wire system 4-20mA standard signal, the precision grade is not lower than 0.1 grade, and a gauge head is provided with a liquid crystal display for on-site display. The pressure guiding pipe and the related mounting material are made of stainless steel.
The combustible gas detector adopts a catalytic technology, is configured with an on-site meter head for displaying, can display the concentration (LEL) on line, has higher measurement precision, and has the measurement precision superior to +/-3 percent LEL (less than or equal to 50 percent LEL) and +/-5 percent LEL (more than 50 percent LEL). The response time of the combustible gas detector to the change of the combustible gas concentration is better than T50 and less than or equal to 10 seconds, T90 and less than or equal to 30 seconds, and the reaction sensitivity of the instrument is less than or equal to 0.5 percent.
The distance between the equipment and the pipeline is convenient to overhaul and maintain, the axial distance of the main pipeline is 1500mm, the length of the straight pipeline section of the process pipeline meets the running requirement of the equipment, the clear distance of the outer surface of the equipment is not less than 500mm, and the connection form of the process pipeline of the skid body and the process pipeline outside the skid (including a diffusing and sewage discharging pipeline) is flange connection.
In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an illustration of the structure of the present invention. Equivalent or simple changes in the structure, characteristics and principles of the invention are included in the protection scope of the patent. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (7)
1. A natural gas pressure regulating station for supercritical circulating fluidized bed boiler gas supply which characterized in that: the device comprises an inlet main pipe (A), a filtering and metering unit (B), a pressure regulating unit (C), a diffusing unit (D), an odorizing unit (E), an outlet main pipe (F) and a sewage disposal pool (G), wherein the inlet main pipe (A) is connected with the filtering and metering unit (B), the filtering and metering unit (B) is connected with the pressure regulating unit (C) and the sewage disposal pool (G), the pressure regulating unit (C) is connected with the outlet main pipe (F), the inlet main pipe (A), the filtering and metering unit (B), the pressure regulating unit (C) and the outlet main pipe (F) are all connected with the diffusing unit (D), and the odorizing unit (E) is connected with the outlet main pipe (F);
the filtering and metering unit (B) comprises a filtering and metering pipeline (B1), a filtering and metering bypass (B2), a filter differential pressure gauge (B3) and a filter liquid level meter (B4), wherein an electric overpressure stop valve (6), a filter (2), a rectifier (10), an ultrasonic flow meter (7) and an electric overpressure stop valve (6) are sequentially installed on the filtering and metering pipeline (B1), a throttling check valve (5) is installed on a bypass of the electric overpressure stop valve (6), the filtering and metering bypass (B2) is connected with a filtering and metering pipeline (B1), a manual ball valve (1), a filter differential pressure gauge (B3) and a manual ball valve (1) are sequentially installed on the filtering and metering bypass (B2), the filter liquid level meter (B4) is installed on the filter (2), the filter (2) is connected with a sewage drainage pool (G), an inlet main pipe (A) is connected with the filtering and metering pipeline (B1), the filtering metering pipeline (B1) is connected with the pressure regulating unit (C), and a nitrogen charging port is arranged on the filtering metering pipeline (B1);
the pressure regulating unit (C) comprises a pressure regulating pipeline (C1), an electric overpressure stop valve (6), a pressure gauge (11), an electromagnetic valve (8), a pressure regulator (3), the pressure gauge (11), the pressure regulator (3), the pressure gauge (11) and a manual ball valve (1) are sequentially installed on the pressure regulating pipeline (C1), a throttling check valve (5) is installed on each bypass of the electric overpressure stop valve (6) and the pressure regulating pipeline (C1), the filtering metering unit (B) is connected with the pressure regulating pipeline (C1), the pressure regulating pipeline (C1) is connected with an outlet main pipe (F), and a nitrogen charging port is formed in the pressure regulating pipeline (C1);
the diffusing unit (D) comprises a first diffusing pipeline (D1), a second diffusing pipeline (D2), a first diffusing port (D3), a second diffusing port (D4) and a diffusing pipe (D5), the inlet main pipe (A) and the filtering metering unit (B) are connected with the first diffusing pipeline (D1), the first diffusing pipeline (D1) is connected with the first diffusing port (D3), the pressure regulating unit (C) and the outlet main pipe (F) are connected with the second diffusing pipeline (D2), the second diffusing pipeline (D2) is connected with the second diffusing port (D4), the first diffusing port (D3) and the second diffusing port (D4) are connected with the diffusing pipe (D5), and a throttle valve (5) is mounted on each of the first diffusing pipeline (D1) and the second diffusing pipeline (D2);
odorizing unit (E) is including odorizing pipeline (E1), photoelectric switch (E2), filter tank (E3), metering tank (E4) and odorizing level gauge (E5), the one end and the female pipe of export (F) of odorizing pipeline (E1) are connected, the other end and photoelectric switch (E2) and metering tank (E4) of odorizing pipeline (E1) are connected, filter tank (E3) and odorizing level gauge (E5) all are connected with metering tank (E4), be connected with water pump (12) between photoelectric switch (E2) and filter tank (E3).
2. The natural gas pressure regulating station for supercritical circulating fluidized bed boiler feed gas of claim 1, characterized in that: the device is characterized in that an insulating joint (9), a manual ball valve (1) and an electric overpressure stop valve (6) are sequentially installed on the inlet main pipe (A), a throttling check valve (5) is installed on a bypass of the electric overpressure stop valve (6), the inlet main pipe (A) is connected with a filtering and metering unit (B), and a nitrogen filling port is formed in the inlet main pipe (A).
3. The natural gas pressure regulating station for supercritical circulating fluidized bed boiler feed gas of claim 1, characterized in that: install electronic superpressure trip valve (6), manual ball valve (1) and insulating joint (9) on the female pipe of export (F) in proper order, install throttle check valve (5) on the bypass of electronic superpressure trip valve (6), pressure regulating unit (C) is connected with female pipe of export (F), be provided with on the female pipe of export (F) and fill nitrogen mouth.
4. The natural gas pressure regulating station for supercritical circulating fluidized bed boiler feed gas of claim 1, characterized in that: the filter metering unit (B) and the pressure regulating unit (C) are both two in number, one of the filter metering unit (B) is a common filter metering unit, the other filter metering unit (B) is a standby filter metering unit, and one of the pressure regulating unit (C) is a common pressure regulating unit and the other pressure regulating unit (C) is a standby pressure regulating unit.
5. A method of operating a natural gas pressure regulating station for supplying gas to a supercritical circulating fluidized bed boiler according to any one of claims 1 to 4, characterized by: before the natural gas pressure regulating station is put into operation, the tightness test and the gas replacement work of an acceptance check valve, an inlet main pipe (A), a filtering and metering unit (B), a pressure regulating unit (C), a diffusing unit (D), an odorizing unit (E) and an outlet main pipe (F) need to be finished, and the operation method of the gas replacement is as follows: closing the electric overpressure stop valve (6) and a throttling check valve (5) of a bypass thereof; opening a manual ball valve (1) arranged in nitrogen, opening a safety valve (4), slowly opening a throttling check valve (5) of a bypass of the safety valve (4), and controlling the pressure increasing speed to be not more than 0.2MPa/min to sample from a first diffusing port (D3); observing the pressure displayed by the pressure gauge (11), and repeatedly and slowly opening a throttling check valve (5) of a next safety valve (4) bypass when the pressure does not rise any more, so that the operation is repeated until a pipeline system of the natural gas pressure regulating station is filled with nitrogen and the oxygen content in the diffused mixed gas reaches below 1%; and after the oxygen content in the diffused sample gas meets the requirement, closing the nitrogen displacement electric overpressure stop valve (6) and the safety valve (4).
6. The method of operating a natural gas booster station for supercritical circulating fluidized bed boiler feed gas of claim 5, characterized by: the natural gas inlet step of the natural gas pressure regulating station comprises the following steps: slowly opening the electric overpressure stop valve (6) and the bypass throttling check valve (5), and controlling the boosting speed to be not more than 0.3 MPa/min; observing the pressure displayed by the pressure gauge (11), and closing the throttling check valve (5) of the bypass when the pressure does not rise any more; then, repeatedly and slowly opening the throttling check valve (5) of the next bypass and the manual ball valve (1), and closing the throttling check valve (5) of the bypass when the pressure does not rise any more; and repeating the steps until the pipeline of the natural gas pressure regulating station is filled with natural gas.
7. The method of claim 5, wherein the natural gas pressure regulating station is operated in a supercritical circulating fluidized bed boiler: the design pressure of the pipeline before pressure is 2.0MPa, the design pressure of the pipeline after pressure regulation is 0.4MPa, and the equipment is ensured that the treatment capacity reaches 44000Nm when the lowest station entering pressure is reached3/h。
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Application publication date: 20210817 |