阅读说明：本技术 一种复合型回转式空气预热器防堵塞自动控制系统 (A kind of compound rotary regenerative air preheater anti-clogging automatic control system ) 是由 吴天顺 白涛 董珍柱 于 2019-09-20 设计创作，主要内容包括：本发明涉及一种复合型回转式空气预热器防堵塞自动控制系统,包括回转式空气预热器、驱动电机、变速器、压力变送器、控制器以及DCS系统；所述压力变送器包括若干分别设置于所述回转式空气预热器的空气侧的进、出口处和烟气侧的进、出口处的压差传感器；所述控制器分别与所述压差传感器、所述变速器以及所述DCS系统电信号连接；所述驱动电机用于驱动所述回转式空气预热器的转轴转动；所述变速器用于调节所述驱动电机的转速；控制器接收来自压差传感器的信号,通过变速器控制驱动电机的转动,调节回转式空气预热器的转轴的转速。(The present invention relates to a kind of compound rotary regenerative air preheater anti-clogging automatic control systems, including rotary regenerative air preheater, driving motor, speed changer, pressure transmitter, controller and DCS system；The pressure transmitter includes the differential pressure pickup at the import and export of several air sides for being respectively arranged at the rotary regenerative air preheater and at the import and export of fume side；The controller is connect with the differential pressure pickup, the speed changer and the DCS system electric signal respectively；The driving motor is for driving the shaft of the rotary regenerative air preheater to rotate；The speed changer is used to adjust the revolving speed of the driving motor；Controller receives the signal from differential pressure pickup and adjusts the revolving speed of the shaft of rotary regenerative air preheater by the rotation of transmission control driving motor.)

1. a kind of compound rotary regenerative air preheater anti-clogging automatic control system, it is characterised in that: including rotary air Preheater (1), driving motor (2), speed changer (3), pressure transmitter (5), controller (8) and DCS system (9)；The pressure Power transmitter (5) includes at the import and export of several air sides for being respectively arranged at the rotary regenerative air preheater (1) and flue gas Differential pressure pickup (51) at the import and export of side；The controller (8) respectively with the differential pressure pickup (51), the speed change Device (3) and the connection of the DCS system (9) electric signal；The driving motor (2) is for driving the rotary regenerative air preheater (1) shaft (11) rotation；The speed changer (3) is used to adjust the revolving speed of the driving motor (2)；Controller (8), which receives, to be come The signal of owner pressure difference sensor (51) adjusts rotary air preheat by the rotation of speed changer (3) control driving motor (2) The revolving speed of the shaft (11) of device (1).

2. compound rotary regenerative air preheater anti-clogging automatic control system according to claim 1, it is characterised in that: also Including temperature transmitter (4)；The temperature transmitter (4) includes several being respectively arranged at the rotary regenerative air preheater (1) Air side import and export at and the import and export of fume side at temperature sensor (41)；The controller (8) and the temperature The connection of gap sensor (41) electric signal；Controller (8) receives the signal for coming from temperature sensor (41), is controlled by speed changer (3) The rotation of driving motor (2) processed adjusts the revolving speed of the shaft (11) of rotary regenerative air preheater (1).

3. compound rotary regenerative air preheater anti-clogging automatic control system according to claim 2, it is characterised in that: institute State temperature sensor (41) and the differential pressure pickup (51) arranged crosswise；The temperature sensor (41) and the pressure difference sensing The projection of device (51) in the horizontal plane is in X font.

4. compound rotary regenerative air preheater anti-clogging automatic control system according to claim 1, it is characterised in that: also Including current transducer (6)；The current transducer (6) includes the current sensor (61) being set on the speed changer (3)； The controller (8) connect with the current sensor (61) electric signal；Controller (8) is received from current sensor (61) Signal adjusts turning for the shaft (11) of rotary regenerative air preheater (1) by the rotation of speed changer (3) control driving motor (2) Speed.

5. compound rotary regenerative air preheater anti-clogging automatic control system according to claim 1, it is characterised in that: also Including rotating speed transducer (7)；The rotating speed transducer (7) includes the speed probe (71) being set on the shaft (11)； The controller (8) connect with the speed probe (71) electric signal；Controller (8) is received from speed probe (71) Signal adjusts turning for the shaft (11) of rotary regenerative air preheater (1) by the rotation of speed changer (3) control driving motor (2) Speed.

6. compound rotary regenerative air preheater anti-clogging automatic control system according to claim 1, it is characterised in that: institute Stating speed changer (3) can be used frequency control, permanent magnetic speed-adjusting, the speed regulation of liquid coupling, pole-changing control, serial-resistance speed-regulation or gear speed regulation Mode carries out speed change.

Technical field

The technical field for removing dust stratification the present invention relates to heat exchange equipment is particularly related to a kind of solution air preheater The method and automatic control system that incrustation is removed.

Background technique

Currently, rotary regenerative air preheater is widely applied on thermal power generation unit as combustion air heating equipment.By In China's fired power generating unit, the problem of burning coal stability is poor and load frequent fluctuation, the corrosion of Yi Fasheng heat accumulation plate or blocking. There are mainly three types of reasons, one is sulphur content in coal-fired coal quality is higher, will cause SO in flue gas₃Content increases, when flue gas reaches sky When air preheater cold end, smoke temperature is lower than flue gas acid dew point temperature, and part acid condensation causes heat accumulation plate to corrode；Second is coal-fired coal Ash content is higher in matter, and ash concentration in flue gas will be caused to increase, reach loose dust stratification easy to form in air preheater；The third is Since current environmental requirement is stringent, most of power plant uses SCR denitration technology, which, which mainly uses, sprays ammonium hydroxide to drop in flue gas Low nitrogen oxides in effluent content, after denitrating system longtime running, catalyst plates are easy to wear and dust stratification, and system will be forced excessive Ammonia is sprayed, causes amount of ammonia slip in system to increase, the SO in excess ammonia and flue gas₃Hydrogen sulfate ammonia, air preheater cold-end air can be generated Temperature lower than hydrogen sulfate ammonia condensing temperature (dew-point temperature of hydrogen sulfate ammonia be 147 DEG C), hydrogen sulfate ammonia condensing be viscous fluid simultaneously It is hardened with grey combination cooling, cause air preheater to block.

Currently, the conventional method for solving air preheater blocking mainly has high pressure water flushing, high pressure steam rinse, air pre- Hot device increases compartment to improve cold end air themperature, all plays certain effect, and still, high pressure water, which rinses hypertonia, will make to store Hot plate deformation, and part flying dust is mixed in flushing water, as Industrial Wastewater Treatment difficulty；High pressure steam rinse effect is obvious, but Part high-quality steam need to be lost, unit heat consumption is caused to increase；Air preheater increases compartment technology and is just locating as emerging technology In promotional period, but improvement cost is high, is still the main problem that the technology faces.

Summary of the invention

In order to overcome the above problem, the present invention provides a kind of compound rotary regenerative air preheater anti-clogging automatic control system System, to solve the environmental protection and economic problems in air preheater fouling cleaning process.

Technical scheme is as follows:

A kind of compound rotary regenerative air preheater anti-clogging automatic control system, including rotary regenerative air preheater, driving electricity Machine, speed changer, pressure transmitter, controller and DCS system；The pressure transmitter includes several is respectively arranged at described time Differential pressure pickup at the import and export of the air side of rotary air preheater and at the import and export of fume side；The controller point It is not connect with the differential pressure pickup, the speed changer and the DCS system electric signal；The driving motor is for driving institute State the shaft rotation of rotary regenerative air preheater；The speed changer is used to adjust the revolving speed of the driving motor；Controller receives Signal from differential pressure pickup adjusts the shaft of rotary regenerative air preheater by the rotation of transmission control driving motor Revolving speed.

It further, further include temperature transmitter；The temperature transmitter include it is several be respectively arranged at it is described rotary Temperature sensor at the import and export of the air side of air preheater and at the import and export of fume side；The controller with it is described The connection of temperature sensor electric signal；Controller receives the signal from temperature sensor, passes through transmission control driving motor Rotation, adjusts the revolving speed of the shaft of rotary regenerative air preheater.

Further, the temperature sensor and the differential pressure pickup arranged crosswise；The temperature sensor with it is described The projection of differential pressure pickup in the horizontal plane is in X font.

It further, further include current transducer；The current transducer includes the electric current being set on the speed changer Sensor；The controller is connect with the current sensor electric signal；Controller receives the signal from current sensor, leads to The rotation for crossing transmission control driving motor adjusts the revolving speed of the shaft of rotary regenerative air preheater.

It further, further include rotating speed transducer；The rotating speed transducer includes that the revolving speed being set in the shaft passes Sensor；The controller is connect with the speed probe electric signal；Controller receives the signal from speed probe, passes through The rotation of transmission control driving motor adjusts the revolving speed of the shaft of rotary regenerative air preheater.

Further, frequency control, permanent magnetic speed-adjusting, the speed regulation of liquid coupling, pole-changing control, string resistance tune can be used in the speed changer Speed or the mode of gear speed regulation carry out speed change.

The invention has the following beneficial effects:

1, when Scale Removal of the present invention, it is not necessarily to scouring media, only relies on the temperature of change air preheater to remove air preheat Incrustation in device avoids rotary regenerative air preheater due to incrustation, it can be achieved that automatic removing to rotary regenerative air preheater incrustation Load down operation occurs.

2, the present invention can determine the incrustation situation inside air preheater according to real data, determine that air preheater turns The control strategy of speed and the matching degree of air preheater revolving speed and load, it is ensured that elimination effect.

Detailed description of the invention

Fig. 1 is overall structure diagram of the invention.

Fig. 2 is the deployment scenarios schematic diagram of temperature sensor and differential pressure pickup in rotary regenerative air preheater.

Fig. 3 is the flow chart of automatic control system of the invention.

Fig. 4 is overall structure diagram of the invention.

Fig. 5 is control circuit part connection figure of the invention.

Appended drawing reference indicates in figure are as follows:

1, rotary regenerative air preheater；11, shaft；12, heat accumulation plate；2, driving motor；3, speed changer；4, temperature transmitter；41, Temperature sensor；5, pressure transmitter；51, differential pressure pickup；6, current transducer；61, current sensor；7, revolving speed pick-up Device；71, speed probe；8, controller；9, DCS system.

Specific embodiment

It is next in the following with reference to the drawings and specific embodiments that the present invention will be described in detail.

Particularly, the A in Fig. 1 indicates the direction of air flowing, and B indicates the direction of flow of flue gas.

Referring to Fig. 1-5, a kind of compound rotary regenerative air preheater anti-clogging automatic control system, including rotary air Preheater 1, driving motor 2, speed changer 3, pressure transmitter 5, controller 8 and DCS system 9；The pressure transmitter 5 includes Pressure at the import and export of several air sides for being respectively arranged at the rotary regenerative air preheater 1 and at the import and export of fume side Gap sensor 51；The controller 8 respectively with 9 telecommunications of the differential pressure pickup 51, the speed changer 3 and the DCS system Number connection；The driving motor 2 is for driving the shaft 11 of the rotary regenerative air preheater 1 to rotate；The speed changer 3 is used for Adjust the revolving speed of the driving motor 2；Controller 8 receives the signal from differential pressure pickup 51, is controlled and is driven by speed changer 3 The rotation of motor 2 adjusts the revolving speed of the shaft 11 of rotary regenerative air preheater 1.

The working principle of rotary regenerative air preheater is as follows:

In rotatable cylindrical rotor on the heating surface loaded on rotary regenerative air preheater 1, and if rotor is also divided simultaneously Dry fan-shaped storehouse lattice, and heat accumulation plate 12 is provided in each storehouse, and circular housing top and bottom is then split up and down Flue gas circulating area, main three parts in seal area air circulation area.Flue gas Circulation Area and fume side are connected with each other, and air stream Logical area is attached with air side, and the rotor of heating surface will allow heating surface to go to cigarette at this time with the rotation of 1 ~ 3r/min revolving speed Gas Circulation Area, flue gas can also flow through heating surface from top to bottom, and heating surface is absorbed with flue gas heat, cause to be heated, once When reaching air circulation region, heating surface will will absorb the heat come and carry out heat transmission from top to bottom, and the every rotation of rotor A heat exchange will be completed within one week, and flue gas volumetric ratio air is big, so exhaust gases passes account for the 40 ~ 50% of the gross area, and it is empty Gas channel only accounts for 30 ~ 40%, and being left part is seal area.

DCS(Distributed Control System) be dcs abbreviation, automatic control industry at home Also referred to as Distributed Control System is a kind of novel computer system for centralized control system.DCS system 9 It is connect with 8 electric signal of controller.Controller 8 transmits signal to DCS system 9, staff by DCS system 9 assign instruction to Controller 8 realizes the running of the compound rotary regenerative air preheater anti-clogging automatic control system.

It further, further include temperature transmitter 4；The temperature transmitter 4 is respectively arranged at the revolution including several Temperature sensor 41 at the import and export of the air side of regenerative air heater 1 and at the import and export of fume side；The controller 8 It is connect with 41 electric signal of temperature sensor；Controller 8 receives the signal from temperature sensor 41, is controlled by speed changer 3 The rotation of driving motor 2 processed adjusts the revolving speed of the shaft 11 of rotary regenerative air preheater 1.Temperature sensor 41 is used as and adjusts back The important evidence of the revolving speed of the shaft 11 of rotary air preheater 1 is sent with 51 mutual backup of differential pressure pickup to controller 8 Data；Meanwhile temperature sensor 41 also will be used to measure the variation of each space temperature variation in rotary regenerative air preheater 1, as return The foundation whether blocked inside rotary air preheater 1, the work for air preheater soot blower system provide reference.

Further, the temperature sensor 41 and 51 arranged crosswise of differential pressure pickup；The temperature sensor 41 It is in X font with the projection of the differential pressure pickup 51 in the horizontal plane.

It further, further include current transducer 6；The current transducer 6 includes the electricity being set on the speed changer 3 Flow sensor 61；The controller 8 is connect with 61 electric signal of current sensor；Controller 8, which receives, comes from current sensor 61 signal controls the rotation of driving motor 2 by speed changer 3, adjusts the revolving speed of the shaft 11 of rotary regenerative air preheater 1. Current sensor 61 is used to acquire the electric current of the driving motor 2 of shaft 11, on the one hand for comparing revolving speed and the control of shaft 11 The matching degree that device 8 is adjusted, on the other hand for comparing the matching degree of shaft 11 Yu unit load, it is ensured that rotary air is pre- The normal operation of hot device 1.

It further, further include rotating speed transducer 7；The rotating speed transducer 7 includes being set in the shaft 11 to turn Fast sensor 71；The controller 8 is connect with 71 electric signal of speed probe；Controller 8, which receives, comes from speed probe 71 signal controls the rotation of driving motor 2 by speed changer 3, adjusts the revolving speed of the shaft 11 of rotary regenerative air preheater 1. Speed probe 71 returns to controller 8 for measuring revolving speed of the shaft 11 under different operating conditions, and by tach signal.In controller In 8, the signal of speed probe 71 and the current signal of driving motor 2 are compared, adjust the revolving speed of shaft 11 in real time, really The temperature protected in rotary regenerative air preheater 1 is higher than hydrogen sulfate ammonia adiabatic condensation temperature, prevents incrustation, blocking.

Further, frequency control, permanent magnetic speed-adjusting, the speed regulation of liquid coupling, pole-changing control, string resistance can be used in the speed changer 3 The mode of speed regulation or gear speed regulation carries out speed change.

Particularly, differential pressure pickup 51 and temperature sensor 41 transmit a signal to controller 8, control speed changer 3 to drive Dynamic motor 2 sends rotary speed instruction；Meanwhile the current sensor 61 of differential pressure pickup 51, temperature sensor 41, driving motor 2, turn Signal is fed back to controller 8 by fast sensor 71 and DCS system 9, to guarantee that the pressure difference of rotary regenerative air preheater 1 reduces When, the revolving speed of 1 shaft 11 of rotary regenerative air preheater and the matching degree of unit load.

Referring to Fig. 5, a kind of compound rotary regenerative air preheater anti-clogging automatic control system, further includes control circuit, Control circuit includes single-chip microcontroller P1, display screen CMP1, touch screen CMP2 and driver P2.Single-chip microcontroller P1 uses 51 single-chip microcontrollers；It drives Relay driving chip, model XC2023 can be used in dynamic device P2；The display screen CMP1 and touch screen CMP2 and single-chip microcontroller The communication interface of P1 is bi-directionally connected, and the input terminal of driver P2 connects the control signal output of single-chip microcontroller P1, and single-chip microcontroller P1 is direct Read the load letter of differential pressure pickup 51, temperature sensor 41, current sensor 61, the data of speed probe 71 and unit Number, judge through discriminating program built in PLC, driver P2 output control signal controls speed changer 3, and display screen CMP1 is for temperature in real time The display of the parameters such as degree, pressure, electric current, revolving speed, touch screen CMP2 are used for the input of manual parameters.

The working principle of the invention:

Referring to Fig. 1-5, when the inlet outlet pressure differential that differential pressure pickup 51 measures rotary regenerative air preheater 1 is higher than under current loads At 1.2-1.5 times of design value, differential pressure pickup 51 sends a signal to controller 8, and controller 8 is issued to speed changer 3 and instructed, drop The slow-speed of revolution, the cold junction temperature of rotary regenerative air preheater 1 start to increase, and 12 hydrogen sulfate ammonia of heat accumulation plate are thermally decomposed, and are flowed Flue gas be carried from heat accumulation plate 12.After incrustation starts reduction between plate, the both ends pressure difference of rotary regenerative air preheater 1 starts to subtract Small, differential pressure pickup 51, temperature sensor 41, the current sensor 61 of driving motor 2, speed probe 71, DCS system 9 will Data are sent to controller 8, after determining revolving speed adjustment instruction by controller 8, are sent to speed changer 3, make rotary air preheat The revolving speed of device 1 matches with currently running load.In addition, temperature sensor 41 can be used when 51 failure of differential pressure pickup It is substituted, sends signal to controller 8.When automatic control system breaks down, it also can switch to and manually adjust, by DCS System 9 is directly controlled.

The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills Art field, is included within the scope of the present invention.