CN203431924U - Pneumatic secondary air door control system of tangentially-fired boiler - Google Patents
Pneumatic secondary air door control system of tangentially-fired boiler Download PDFInfo
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- CN203431924U CN203431924U CN201320382152.3U CN201320382152U CN203431924U CN 203431924 U CN203431924 U CN 203431924U CN 201320382152 U CN201320382152 U CN 201320382152U CN 203431924 U CN203431924 U CN 203431924U
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Abstract
The utility model discloses a pneumatic secondary air door control system of a tangentially-fired boiler, and belongs to the technical field of industrial control. The system comprises a secondary air pneumatic actuator, an intelligent positioning device, control cables, a distributed control system, an instrument air source primary pipe and an instrument air source branch pipe. The secondary air pneumatic actuator and the intelligent positioning device are connected with the instrument air source primary pipe through the instrument air source branch pipe, and the secondary air pneumatic actuator and the intelligent positioning device are directly connected with the distributed control system through the control cables. The control system solves the problems that in the prior art, hidden safety risks exist, control precision is low and installation cost is high, and is safe and precise to control and low in cost.
Description
Technical field
The utility model belongs to industrial control technology field, relates in particular to the pneumatic secondary air register control system of a kind of coner firing boiler.
Background technology
DCS:DCS is the english abbreviation (Distributed Control System) of Distributed Control System, be a kind of novel computer control system for Centralized Control System, it is on the basis of Centralized Control System, to develop, develop and come.Be one by process control level and process monitoring level, formed take the multi-level computer system that communication network is tie, combine computer, the 4C technology such as communication, demonstration and control, its basic thought is that decentralised control, centralized operation, differentiated control, flexible configuration and configuration are convenient.
Fieldbus FCS: the data/address bus that is mounted in the field apparatus/instrument in production process region and a kind of serial between the automaton/system in control room, digital, multiple spot, two-way communication.Be to using the digitlization of single dispersion, intelligentized measurement and control appliance as the node of network, with data/address bus, be connected, realize mutual exchange message, jointly complete network system and the control system of controlling function.
PROFIBUS: mainly being supported by Siemens, is the standard for Fieldbus of working out according to ISO/OSI reference model.By Profibus-FMS, Profibus-DP, tri-compatible parts of Profibus-PA, formed.Profibus-FMS is local communication standard, for workshop level monitor network, is a token structure, real-time many master networks.Profibus-DP is the low-cost communication of a kind of high speed, for device level control system and distributing I/O communication.Profibus-PA is a kind of process automation design that aims at, and can make sensor and actuator be associated in a bus, and have intrinsic safety standard.
The pneumatic secondary air register control system of traditional coner firing boiler is: Secondary Air pneumatic actuator is controlled by gas control cabinet on the spot, 4, every stove of gas control cabinet, wherein control 4 layers of pneumatic actuator for 1, all the other 3 cabinets are controlled respectively 3 layers of pneumatic actuator, totally 13 layers of 52 pneumatic actuator.Gas control cabinet is comprised of electropneumatic transducer, servo amplifier, three-way magnetic valve, position transmitter, protection when losing signal device, mechanical locator, latching valve etc.4～20mA DC layer control the signal being come by DCS becomes gas signal through current to pneumatic converter, then by mechanical locator, goes to control with 4 Secondary Air pneumatic actuator of layer after servo amplifier amplifies.The displacement of executing agency is converted to 4～20mA DC feedback signal to DCS by position transmitter.By protection when losing signal device, three-way magnetic valve, latching valve etc., form the three disconnected protective devices with 4 actuator of layer, when break signal, power-off, while dying source, actuator keeps original position.Pneumatic actuator adopts
stainless steel tube distribution, every Secondary Air pneumatic actuator needs 3 road sources of the gas, is respectively and drives source of the gas, signal source of the gas, protects a position source of the gas, actuator is except driving source of the gas to get source of the gas nearby, signal source of the gas, protects a position source of the gas and is from Pneumatic controlled box to actuator all.This engineering Pneumatic controlled box is arranged in #1, the right 12 meters of layers of #2 angle burner intermediate furnace, #1, #2 angle actuator signal source of the gas, a guarantor position source of the gas pipe arrangement be about 20mX2X13X2=1040m altogether, #1, #2 angle actuator driven source of the gas pipe arrangement be about 10mX1X13X2=260m altogether, #3, #4 angle actuator signal source of the gas, a guarantor position source of the gas pipe arrangement be about 50mX2X13X2=2600m altogether, #3, #4 angle actuator driven source of the gas pipe arrangement be about 10mX1X13X2=260m altogether, four jiaos of Secondary Air actuators (not containing tilting burner)
source of the gas pipe arrangement about 4160m altogether.Secondary Air actuator source of the gas pipe arrangement large usage quantity, installation cost is higher, and solder joint is many, and workload is large, long in time limit, and easily leaks.
Secondary air register is in operation and finds that part secondary air register fits badly, and also has part pneumatic actuator to close not in place, causes four jiaos of secondary air register air distributions uneven, in burner hearth, leaks out, and affects Furnace Aerodynamic Field.Trace it to its cause is because secondary air register pneumatic actuator control mode is unreasonable, use a current to pneumatic converter to control four secondary air registers of one deck simultaneously, can not meet the needs of safety in production, and bring larger potential safety hazard, if control current to pneumatic converter or the servo amplifier fault of same layer, by causing, 4 secondary air registers with layer are out of control; And the quality of mechanical type locator own is unreliable, often occur that executing agency's switch is dumb, switched linear degree is bad, locator bite, response time not etc., the problem such as feedback signal drift, have a strong impact on the control of operations staff to Secondary Air air distribution, to Boiler Stable Combustion, bring potential safety hazard, and control accuracy is poor, air consumption is larger.。Can only program control (with four jiaos of secondary air register of layer) with this traditional control program DCS of gas control cabinet on the spot, can not control separately every secondary air register, the in the situation that of air flow unbalance, owing to taking gas control cabinet, control, all accessories all harden and solidify, and bring very large difficulty to debugging and maintenance.
Utility model content
The purpose of this utility model is to provide a kind of novel boiler pneumatic secondary air register control system, overcome the problems such as the potential safety hazard, the control accuracy that exist in prior art are low, installation cost is high, realize a kind of safe, accurately control and lower-cost control system.
For realizing above object, the utility model proposes the pneumatic secondary air register control system of a kind of coner firing boiler, this system comprises: Secondary Air pneumatic actuator, intelligent positioner, control cables, Distributed Control System, the female pipe of instrument air, instrument air arm, wherein: described Secondary Air pneumatic actuator is connected by the female pipe of instrument air arm and instrument air with intelligent positioner; Described Secondary Air pneumatic actuator is directly connected with Distributed Control System by control cables with intelligent positioner.
According to an aspect of the present utility model, any one jiao of described coner firing boiler all has corresponding Secondary Air pneumatic actuator and intelligent positioner.
According to an aspect of the present utility model, the quantity of described Secondary Air pneumatic actuator is relevant to model and the evaporation capacity of boiler.
According to an aspect of the present utility model, it is the instrument stainless steel tube of Φ 14 * 2 that described instrument air arm adopts specification.
According to an aspect of the present utility model, described Secondary Air pneumatic actuator comprises additional ventilation flap Secondary Air actuator, fuel air door Secondary Air actuator, after-flame air door Secondary Air actuator.
According to an aspect of the present utility model, described Distributed Control System comprises control rack, and described control cables transfers to Secondary Air pneumatic actuator for the control signal that described control rack is sent.
According to an aspect of the present utility model, described intelligent positioner is the intelligent positioner with fieldbus function; Described control cables is bus cable; And wherein said bus cable transfers to Secondary Air pneumatic actuator for the Fieldbus Control signal that described control rack is sent.
According to an aspect of the present utility model, wherein said Fieldbus Control signal is followed PROFIBUS or FF bus protocol.
The technical scheme the utility model proposes has improved control accuracy, and the control mode of realization is versatile and flexible, is convenient to site examining and repairing and maintenance; Reduce air consumption, cancel independent feed cable or cancel cable, play the effect of electricity saving and energy saving; Reduce Secondary Air pneumatic actuator instrument air pipe arrangement consumption, accelerated construction speed, improved construction quality, and saved mounting material.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of pneumatic secondary air register control system the first embodiment of coner firing boiler that the utility model proposes;
Fig. 2 is the schematic diagram of pneumatic secondary air register control system the second embodiment of coner firing boiler that the utility model proposes.
The specific embodiment
The following stated is better embodiment of the present utility model, does not therefore limit protection domain of the present utility model.
As shown in Figure 1, in the first embodiment, the Secondary Air pneumatic actuator at boiler #1 angle of take describes as example, and the Secondary Air pneumatic actuator at #2～#4 angle is identical with the Secondary Air pneumatic actuator at #1 angle.This programme is mainly controlled rack 4, the female pipe 5 of instrument air, instrument air arm 6 etc. by Secondary Air pneumatic actuator 1, intelligent positioner 2, control cables 3, DCS and is formed.Each layer, boiler #1～#4 angle Secondary Air pneumatic actuator 1 quantity is difference with the difference of boiler model and evaporation capacity, from each layer of secondary air register role, the secondary air register actuator at every angle is divided into again additional ventilation flap Secondary Air actuator, fuel air door Secondary Air actuator, after-flame air door Secondary Air actuator.The female pipe 5 of instrument air at every angle is taken to respectively the female pipe of air for instrument of technique specialty under operation level of boiler, and the Secondary Air pneumatic actuator 1 of each floor of every angle is by a road
instrument air arm 6 from the female pipe 5 of instrument air, get gas.From DCS, control 4～20mA control signal of rack 4 and control the Secondary Air actuator 1 of each layers of every angle by control cables 3, and then the secondary air register of controlling each layer of every angle is opened large or turns down.
As shown in Figure 2, in a second embodiment, the Secondary Air pneumatic actuator at boiler #1 angle of take describes as example, and the Secondary Air pneumatic actuator at #2～#4 angle is identical with the Secondary Air pneumatic actuator at #1 angle.This programme is mainly controlled rack 4, the female pipe 5 of instrument air, instrument air arm 6 etc. by Secondary Air pneumatic actuator 1, the intelligent positioner 2 with fieldbus function, bus cable 3, DCS and is formed.Each layer, boiler #1～#4 angle Secondary Air pneumatic actuator 1 quantity is difference with the difference of boiler model and evaporation capacity, from each layer of secondary air register role, the secondary air register actuator at every angle is divided into again additional ventilation flap Secondary Air actuator, fuel air door Secondary Air actuator, after-flame air door Secondary Air actuator.The female pipe 5 of instrument air at every angle is taken to respectively the female pipe of air for instrument of technique specialty under operation level of boiler, and the Secondary Air pneumatic actuator 1 of each floor of every angle is by a road
instrument air arm 6 from the female pipe 5 of instrument air, get gas.From DCS, control the Fieldbus Control signal (as bus protocols such as PROFIBUS or FF) of rack 4 and control the Secondary Air actuator 1 of each layers of every angle by bus cable 3, and then the secondary air register of controlling each layer of every angle is opened large or turns down.
As can be seen here, the technical scheme the utility model proposes has following characteristics:
1. cancel the pneumatic secondary air register of coner firing boiler gas control cabinet on the spot, the locator of Secondary Air pneumatic actuator adopts the man-to-man intelligent positioner of the ripe brand of import or has the intelligent positioner of fieldbus function, make Secondary Air pneumatic actuator positioning precision higher, life-span is longer, air consumption is minimum, saves operating cost.
2. every Secondary Air pneumatic actuator is only joined 1 road source of the gas, drives source of the gas, signal source of the gas, protects position source of the gas by actuator internal conversion, saves instrument air pipeline.
3.DCS directly controls every secondary air register, secondary air register is become by soft logic and realized from the hard-wired layer control of original gas control cabinet, controls of not only can having controlled separately but also can combine, no longer curing as gas control cabinet, airdoor control mode can not arbitrarily change, and is unfavorable for inspection and maintenance.
4. Secondary Air pneumatic actuator adopts import intelligent positioner or has the intelligent positioner of fieldbus function, be not with gas control cabinet on the spot, Secondary Air pneumatic actuator is directly controlled by 4～20mA DC by DCS or is directly controlled by Fieldbus Control signal (as bus protocols such as PROFIBUS or FF).
Should note; the specific embodiment that the utility model proposes and application be the object for illustrating only;, as the restriction to the utility model protection domain, those skilled in the art can not modify to meet actual needs to the specific embodiment of the present utility model.
Claims (8)
1. the pneumatic secondary air register control system of coner firing boiler, is characterized in that: described system comprises:
Secondary Air pneumatic actuator, intelligent positioner, control cables, Distributed Control System, the female pipe of instrument air, instrument air arm, wherein:
Described Secondary Air pneumatic actuator is connected by the female pipe of instrument air arm and instrument air with intelligent positioner;
Described Secondary Air pneumatic actuator is directly connected with Distributed Control System by control cables with intelligent positioner.
2. system according to claim 1, is characterized in that:
Any one jiao of described coner firing boiler all has corresponding Secondary Air pneumatic actuator and intelligent positioner.
3. system according to claim 1, is characterized in that:
The quantity of described Secondary Air pneumatic actuator is relevant to model and the evaporation capacity of boiler.
4. system according to claim 1, is characterized in that:
It is the instrument stainless steel tube of Φ 14 * 2 that described instrument air arm adopts specification.
5. system according to claim 1, is characterized in that:
Described Secondary Air pneumatic actuator comprises additional ventilation flap Secondary Air actuator, fuel air door Secondary Air actuator, after-flame air door Secondary Air actuator.
6. according to the arbitrary described system of claim 1-5, it is characterized in that:
Described Distributed Control System comprises control rack, and described control cables transfers to Secondary Air pneumatic actuator for the control signal that described control rack is sent.
7. system according to claim 6, is characterized in that:
Described intelligent positioner is the intelligent positioner with fieldbus function;
Described control cables is bus cable; And wherein
Described bus cable transfers to Secondary Air pneumatic actuator for the Fieldbus Control signal that described control rack is sent.
8. system according to claim 7, is characterized in that:
Wherein said Fieldbus Control signal is followed PROFIBUS or FF bus protocol.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320382152.3U CN203431924U (en) | 2013-06-29 | 2013-06-29 | Pneumatic secondary air door control system of tangentially-fired boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320382152.3U CN203431924U (en) | 2013-06-29 | 2013-06-29 | Pneumatic secondary air door control system of tangentially-fired boiler |
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| Publication Number | Publication Date |
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| CN203431924U true CN203431924U (en) | 2014-02-12 |
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| CN201320382152.3U Expired - Fee Related CN203431924U (en) | 2013-06-29 | 2013-06-29 | Pneumatic secondary air door control system of tangentially-fired boiler |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108766612A (en) * | 2018-04-17 | 2018-11-06 | 中国核电工程有限公司 | A kind of novel nuclear fuel reprocessing plant's evaporator process detection and debugging system |
-
2013
- 2013-06-29 CN CN201320382152.3U patent/CN203431924U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108766612A (en) * | 2018-04-17 | 2018-11-06 | 中国核电工程有限公司 | A kind of novel nuclear fuel reprocessing plant's evaporator process detection and debugging system |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: INNER MONGOLIA ELECTRIC POWER SURVEY DESIGN INSTIT Free format text: FORMER NAME: INNER MONGOLIA ELECTRICAL POWER INVESTIGATE AND DESIGN INSTITUTE |
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| CP01 | Change in the name or title of a patent holder |
Address after: 010010 Hohhot, the Inner Mongolia Autonomous Region Tin Road, No. 209 Patentee after: INNER MONGOLIA POWER SURVEY & DESIGN INSTITUTE Co.,Ltd. Address before: 010010 Hohhot, the Inner Mongolia Autonomous Region Tin Road, No. 209 Patentee before: Inner Mongolia Electric Power Survey Design Institute |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140212 |
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| CF01 | Termination of patent right due to non-payment of annual fee |