阅读说明：本技术 一种核用蒸汽重整控制系统 (Nuclear steam reforming control system ) 是由 吴洪君 章航洲 张少伟 李文钰 赵聆兵 林力 谢庆勇 胥箫 蒋礼军 何子昂 杨静 于 2019-11-25 设计创作，主要内容包括：本发明公开了一种核用蒸汽重整控制系统,包括动力分配柜和DCS控制柜；DCS控制柜分别与安全设备控制柜和安全设备及仪表信号连接；DCS控制柜通过RJ45接口与PC端信号连接；DCS控制柜、PC端、安全设备控制柜和安全设备及仪表均与不间断电源供电柜电连接；动力分配柜输入端与市电连接,其输出端分别与市电供电柜、不间断电源供电柜和UPS电源连接；UPS电源与电池组电连接；市电供电柜与非安全设备电连接；DCS控制柜内置两块CPU；与动力分配柜连接的市电至少包括两个不同的变电所进行供电；DCS控制柜分别与进料系统、蒸汽供应系统、蒸汽重整系统、全氧化系统和尾气处理系统中的设备和仪器电连接。(The invention discloses a nuclear steam reforming control system, which comprises a power distribution cabinet and a DCS (distributed control system) control cabinet; the DCS control cabinet is respectively in signal connection with the safety equipment control cabinet, the safety equipment and the instrument; the DCS control cabinet is in signal connection with the PC end through an RJ45 interface; the DCS control cabinet, the PC terminal, the safety equipment control cabinet, the safety equipment and the instrument are all electrically connected with the uninterruptible power supply cabinet; the input end of the power distribution cabinet is connected with the mains supply, and the output end of the power distribution cabinet is respectively connected with the mains supply cabinet, the uninterruptible power supply cabinet and the UPS; the UPS power supply is electrically connected with the battery pack; the commercial power supply cabinet is electrically connected with the non-safety equipment; two CPUs are arranged in the DCS control cabinet; the commercial power connected with the power distribution cabinet at least comprises two different substations for supplying power; the DCS control cabinet is respectively and electrically connected with equipment and instruments in the feeding system, the steam supply system, the steam reforming system, the total oxidation system and the tail gas treatment system.)

1. A nuclear steam reforming control system, characterized by: comprises a power distribution cabinet and a DCS control cabinet; the DCS control cabinet is respectively in signal connection with the safety equipment control cabinet, the safety equipment and the instrument; the DCS control cabinet is in signal connection with a PC end through an RJ45 interface; the DCS control cabinet, the PC terminal, the safety equipment control cabinet, the safety equipment and the instrument are all electrically connected with the uninterruptible power supply cabinet; the input end of the power distribution cabinet is connected with a mains supply, and the output end of the power distribution cabinet is respectively connected with the mains supply cabinet, the uninterruptible power supply cabinet and the UPS; the UPS power supply is electrically connected with the battery pack; and the commercial power supply cabinet is electrically connected with the non-safety equipment.

2. The nuclear steam reforming control system of claim 1, wherein: two CPUs are arranged in the DCS control cabinet.

3. The nuclear steam reforming control system of claim 1, wherein: and the commercial power connected with the power distribution cabinet at least comprises two different substations for supplying power.

4. The nuclear steam reforming control system of claim 1, wherein: and the DCS control cabinet is respectively and electrically connected with equipment and instruments in the feeding system, the steam supply system, the steam reforming system, the total oxidation system and the tail gas treatment system.

5. The nuclear steam reforming control system of claim 4, wherein: the feeding system and the steam supply system are both connected with the steam reforming system; the steam reforming system is connected with the total oxidation system and the tail gas treatment system in sequence.

6. The nuclear steam reforming control system of claim 5, wherein: the feeding system comprises a feeder and a quantitative feeder connected with the feeder; the steam supply system comprises a steam generator and a steam superheater communicated with the steam generator; the steam reforming system comprises a fluidized bed which is respectively communicated with the constant feeder and the steam superheater; the fluidized bed is sequentially connected with the cyclone separator and the high-temperature filter; the cyclone separator and the high-temperature device are both connected with the waste solid collector; the total oxidation system comprises a total oxidation furnace connected with the high-temperature filter; the tail gas treatment system comprises a spray tower communicated with the full-oxidation furnace; the spray tower is communicated with the gas-liquid separator, the vacuum pump and the chimney in sequence.

7. The nuclear steam reforming control system of claim 6, wherein: and a burner and an ignition device are arranged in the total oxidation furnace.

8. The nuclear steam reforming control system of claim 1, wherein: the DCS control cabinet is electrically connected with safety equipment and instruments respectively, and the safety equipment and the instruments comprise a feeder, a constant feeder, a fluidized bed, a cyclone separator, a high-temperature filter, a full-oxidation furnace, a spray tower, a vacuum pump, a steam generator, a steam superheater, an electromagnetic flow meter, a pressure sensor, a differential pressure sensor, a flow controller, an electric stop valve, an electric opening valve, a radar liquid level meter, a thermocouple, a thermal resistor, a temperature sensor, a fan, a manual ball valve, a safety valve, a feeding system and a pipeline.

Technical Field

The invention belongs to the technical field of steam reforming, and particularly relates to a nuclear steam reforming control system.

Background

At present, in domestic nuclear power plants, radioactive organic wastes, particularly waste water, waste resin and sludge are treated by a process of conveying the wastes from a storage plant to a disposal plant through a pipeline and then entering a cement curing plant through a pumping way. In the whole process, the pipeline transportation has the difficulty of post maintenance, organic waste enters a disposal plant to carry out a cement solidification plant, and the method belongs to a capacity increasing means for radioactive substance disposal and indirectly increases the waste storage load.

The steam reforming technology is an advanced technology for treating and reducing the volume of medium and low radioactive waste resin in the nuclear post-treatment at present, radioactive organic waste is decomposed into inorganic matters, low molecular organic compounds and the like (hereinafter referred to as flue gas) through high temperature, radioactive heavy metals are contained in the inorganic matters through a special process, and finally the inorganic matters are collected and the organic compounds are discharged through purification.

The nuclear power plant has high emission requirements on waste solids, waste liquid and waste gas, particularly the waste solids, the waste liquid and the waste gas after being irradiated are treated and then discharged in a special treatment center, the steam reforming technology also faces the emission of the waste gas, in the steam reforming technology, organic waste resin is decomposed into inorganic matters and organic compounds through a series of treatment processes, the inorganic matters determine the yield due to the characteristics of the waste resin, and the waste gas consists of the organic compounds, secondary combustion waste gas, combustion-supporting air, heat exchange air and the like in the treatment process, so that the waste gas quantity is large, and the waste generated by the treated waste gas is large when the waste gas quantity is large.

Although the steam reforming technology can effectively solve the problem of decomposition of the radioactive waste resin, how to realize efficient and stable control of the whole steam reforming technology is still a problem.

Disclosure of Invention

The present invention addresses the above-identified deficiencies in the art by providing a nuclear steam reforming control system that solves or ameliorates the above-identified problems.

In order to achieve the purpose, the invention adopts the technical scheme that:

a nuclear steam reforming control system comprises a power distribution cabinet and a DCS control cabinet; the DCS control cabinet is respectively in signal connection with the safety equipment control cabinet, the safety equipment and the instrument; the DCS control cabinet is in signal connection with the PC end through an RJ45 interface; the DCS control cabinet, the PC terminal, the safety equipment control cabinet, the safety equipment and the instrument are all electrically connected with the uninterruptible power supply cabinet; the input end of the power distribution cabinet is connected with the mains supply, and the output end of the power distribution cabinet is respectively connected with the mains supply cabinet, the uninterruptible power supply cabinet and the UPS; the UPS power supply is electrically connected with the battery pack; the commercial power supply cabinet is electrically connected with the non-safety equipment.

Preferably, two CPUs are arranged in the DCS control cabinet.

Preferably, the utility power connected to the power distribution cabinet comprises at least two different power substations for supplying power.

Preferably, the DCS control cabinet is electrically connected to the equipment and instruments in the feed system, the steam supply system, the steam reforming system, the total oxidation system and the tail gas treatment system, respectively.

Preferably, the feed system and the steam supply system are both connected to the steam reforming system; the steam reforming system is connected with the total oxidation system and the tail gas treatment system in sequence.

Preferably, the feeding system comprises a feeder and a quantitative feeder connected with the feeder; the steam supply system comprises a steam generator and a steam superheater communicated with the steam generator; the steam reforming system comprises a fluidized bed which is respectively communicated with the constant feeder and the steam superheater; the fluidized bed is connected with the cyclone separator and the high-temperature filter in sequence; the cyclone separator and the high-temperature device are both connected with the waste solid collector; the total oxidation system comprises a total oxidation furnace connected with the high-temperature filter; the tail gas treatment system comprises a spray tower communicated with the full oxidation furnace; the spray tower is communicated with the gas-liquid separator, the vacuum pump and the chimney in sequence.

Preferably, the total oxidation furnace is equipped with a burner and an ignition device therein.

Preferably, the DCS control cabinet is electrically connected with safety equipment and instruments respectively, and the safety equipment and the instruments comprise a feeder, a quantitative feeder, a fluidized bed, a cyclone separator, a high-temperature filter, a full-oxidation furnace, a spray tower, a vacuum pump, a steam generator, a steam superheater, an electromagnetic flow meter, a pressure sensor, a differential pressure sensor, a flow controller, an electric stop valve, an electric opening valve, a radar liquid level meter, a thermocouple, a thermal resistor, a temperature sensor, a fan, a manual ball valve, a safety valve, a feeding system and a pipeline.

The nuclear steam reforming control system provided by the invention has the following beneficial effects:

the electrical equipment and the instrument are designed with the safety of nuclear use taken into consideration, the key power supply and control adopt a redundancy design, wherein the DCS adopts a CPU redundancy mode, once one CPU stops running or fails, the backup CPU is started to be in seamless connection within 5 ms; the key equipment and the DCS are powered by adopting a dual-power structure, once the UPS power supply starts to supply power after the commercial power is lost, dual commercial power is used for supplying power when the primary power supply is supplied, each group of power supplies come from different power substations, and if the fault source is a primary power supply unit, the capacity of the UPS power supply is enough for the system to carry out emergency treatment to close or open the key valve, so that the nuclear leakage is avoided.

The DCS control cabinet and the safety equipment control cabinet are respectively in signal connection with the equipment and the instruments in each system, real-time detection and control of each equipment are achieved, the detected operation conditions of each equipment and each instrument are transmitted to the PC end in real time, and timely control over each equipment and each instrument is achieved conveniently by the PC end.

Drawings

FIG. 1 is a functional block diagram of a nuclear steam reforming control system.

FIG. 2 is a functional block diagram of a steam reforming system.

FIG. 3 is a block diagram of a steam reforming system.

Wherein, 1, a feeder; 2. a constant feeder; 3. a fluidized bed; 4. a cyclone separator; 5. a high temperature filter; 6. a waste solids collector; 7. a total oxidation furnace; 8. a spray tower; 9. a gas-liquid separator; 10. a vacuum pump; 11. a chimney; 12. a constant delivery pump; 13. a steam generator; 14. a steam superheater.

Detailed Description

The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.

According to an embodiment of the application, referring to fig. 1, the nuclear steam reforming control system of the scheme comprises a power distribution cabinet and a DCS control cabinet.

The DCS control cabinet is respectively in signal connection with the safety equipment control cabinet, the safety equipment and the instrument, the DCS control cabinet is in signal connection with the PC end through the RJ45 interface, the PC end controls the DCS control cabinet and the safety equipment control cabinet, and then control over each safety equipment and the instrument is achieved.

The DCS control cabinet, the PC end, the safety equipment control cabinet, the safety equipment and the instrument are all electrically connected with the uninterrupted power supply cabinet, the input end of the power distribution cabinet is connected with the mains supply, and the output end of the power distribution cabinet is respectively connected with the mains supply cabinet, the uninterrupted power supply cabinet and the UPS; the UPS power supply is electrically connected with the battery pack; the commercial power supply cabinet is electrically connected with the non-safety equipment. The power supply control system is used for providing enough power supply power for the control system, can realize control on corresponding equipment even when the power supply fails, and avoids accidents such as nuclear leakage and the like.

The control system and steam reforming will be described in detail below

Referring to fig. 2, the complete system for steam reforming comprises: a feed system, a steam supply system, a steam reforming system, a total oxidation system, and a tail gas treatment system.

The feeding system and the steam supply system are both connected with the steam reforming system; the steam reforming system is connected with the total oxidation system and the tail gas treatment system in sequence.

Referring to fig. 3, the feeding system comprises a feeder 1 and a quantitative feeder 2 connected to the feeder 1 for receiving solid materials to be treated (such as resin, additives, carbon, catalyst, etc.) and quantitatively feeding the steam reforming fluidized bed 3 at a certain rate.

The feeding system and the electric control system are composed of a PLC, an HMI, a servo controller, a servo motor and a weighing device. The feeding process is controlled by a DCS control cabinet.

The steam supply system comprises a steam generator 13 and a steam superheater 14 communicated with the steam generator 13, wherein the steam generator 13 is connected with the dosing pump 12 and is used for providing high-temperature steam for the fluidized bed 3; the steam generator 13 and the steam generator 13 are controlled by a DCS control cabinet.

The steam reforming system comprises a fluidized bed 3 which is respectively communicated with a constant feeder 2 and a steam superheater 14; the fluidized bed 3 is connected with a cyclone separator 4 and a high-temperature filter 5 in sequence; the cyclone 4 and the high temperature device are both connected with a waste solid collector 6.

The steam reforming system is used for pyrolyzing and reforming the fed materials to be treated, performing gas-solid separation on a gas mixture containing residues after pyrolysis, and collecting the separated small-volume reforming residues. Each electrical equipment and instrument in the steam reforming system are controlled by a DCS control cabinet and a safety equipment control cabinet.

The total oxidation system comprises a total oxidation furnace 7 connected with the high-temperature filter 5, and is used for burning combustible gas in the mixed gas generated by steam reforming of the fluidized bed 3 in the total oxidation furnace 7, completely oxidizing combustible gas components (carbon monoxide, hydrogen and the like), and ensuring that the content of the combustible gas in tail gas at the outlet of the total oxidation furnace 7 is below 0.01%.

The total oxidation system consists of a total oxidation furnace 7, a blower and other equipment, corresponding pipelines and valves, a burner, a high-energy ignition device and the like are installed in the total oxidation furnace 7, the shell is provided with heat preservation, and electrical equipment and instruments are controlled by a DCS control cabinet and a safety equipment control cabinet.

The tail gas treatment system comprises a spray tower 8 communicated with the total oxidation furnace 7; the spray tower 8 is communicated with a gas-liquid separator 109, a vacuum pump and a chimney 11 in sequence; the device is used for carrying out alkali washing on the burnt tail gas, and purifying the gas again in a spraying mode, so that the purification of the gas of the radioactive organic waste steam reforming device is realized.

In conclusion, the DCS switch board is connected with safety device and instrument electricity respectively, safety device and instrument include feeder 1, constant feeder 2, fluidized bed 3, cyclone 4, high temperature filter 5, full oxidation furnace 7, spray tower 8, the vacuum pump, steam generator 13, steam superheater 14, the electromagnetic flow meter, pressure sensor, differential pressure sensor, flow controller, electronic stop valve, electronic opening valve, the radar level gauge, the thermocouple, the thermal resistance, temperature sensor, the fan, manual ball valve, the relief valve, feed system and pipeline.

The DCS control cabinet and the safety equipment control cabinet are respectively in signal connection with the equipment and the instruments in each system, real-time detection and control of each equipment are achieved, the detected operation conditions of each equipment and each instrument are transmitted to the PC end in real time, and timely control over each equipment and each instrument is achieved conveniently by the PC end.

This system adopts UPS + battery cabinet combination, and the back is cut off the power supply to equipment, and UPS inserts in 5MS and uses the battery power supply, and after the external power source outage, the incessant monitoring instrument of DCS switch board, other equipment states, still accessible PC end read the data that the DCS switch board received, gathered, and the use of UPS power has also greatly reduced the potential safety hazard behind the abnormal power failure simultaneously.

The safety of nuclear application should be considered during the design of electric appliances and instruments, and the key power supply and control adopt a redundancy design, for example: the DCS gauge control gauge adopts a CPU redundancy mode, once one CPU stops running or fails, the backup CPU starts seamless connection within 5 ms.

The key equipment and the DCS control cabinet are powered by adopting a dual-power structure, once the UPS power supply starts to supply power after the commercial power is lost, dual commercial power is used for supplying power when the upper-level power supply is used, each group of power supplies come from different power substations, and if the fault source is a first-level power supply unit, the capacity of the UPS power supply is enough for the system to carry out emergency treatment to close or open a key valve, so that nuclear leakage is avoided.

While the embodiments of the invention have been described in detail in connection with the accompanying drawings, it is not intended to limit the scope of the invention. Various modifications and changes may be made by those skilled in the art without inventive step within the scope of the appended claims.