CN103423740B - Process of Circulating Fluidized Bed Boiler automatic control system and method - Google Patents

Abstract

The invention discloses a kind of Process of Circulating Fluidized Bed Boiler automatic control system and method, system comprise that the field intelligent instrument, database, the data that are connected with CFBB are made an excuse, control station and host computer; Field intelligent instrument is connected with control station, database and host computer, and control station comprises: signal acquisition module, for gathering the live signal of boiler operating parameter from field intelligent instrument; Combustion System module, for the change according to boiler operatiopn condition, produces the actuator command signal of air quantity, coal amount, lime stone amount automatically; Command output module, for being sent to on-the-spot actuator by described actuator command signal; Operation display module.The present invention can in real time according to the change of boiler operatiopn condition, automatic adjustment air quantity, coal amount, lime stone amount, disturbance cancelling, keeps stable steam quality, thus effectively improve the security of CFBB, the feature of environmental protection and economy, and fully reduce the labour intensity of operating personnel.

Description

Process of Circulating Fluidized Bed Boiler automatic control system and method

Technical field

The present invention relates to energy project field, especially, relate to a kind of Process of Circulating Fluidized Bed Boiler automatic control system and method.

Background technology

CFBB has the advantages such as pollutant emission is few, fuel tolerance wide, Load Regulation ability is strong, obtains in recent years applying more and more widely in the industry such as electric power, heat supply.Combustion system is a Major Systems of CFBB, and the Control platform of combustion system has influence on security and the economy of boiler operatiopn.But Process of Circulating Fluidized Bed Boiler has multi-parameter, non-linear, large time delay and the closely-coupled feature of multivariable, give and automatically control to bring very large difficulty.The CFBB ubiquity of current domestic operation cannot realize the problem that combustion process controls automatically, causes larger obstacle to the safety of unit, economical operation.Set up a set of excellent combustion process of combustion process automatic control system to boiler effectively automatically to control, to raising CFBB security and economy, the labour intensity reducing operating personnel is significant.

Summary of the invention

Summary of the invention

The object of the invention is to for the deficiencies in the prior art, a kind of CFBB heat loss due to exhaust gas prognoses system and method are provided.

The technical solution adopted for the present invention to solve the technical problems is: a kind of Process of Circulating Fluidized Bed Boiler automatic control system, comprises the field intelligent instrument, database, data-interface, control station and the host computer that are connected with CFBB; Field intelligent instrument is connected with control station, database and host computer, and described control station comprises:

Signal acquisition module, for the sampling time interval by setting, gather the live signal of main steam pressure, main steam flow, main steam temperature, feed temperature, primary air flow, secondary air flow, #1 coal supply machine-made egg-shaped or honey-comb coal briquets amount, #2 coal supply machine-made egg-shaped or honey-comb coal briquets amount, lime stone amount, flue gas oxygen content, SO 2 from fume content from field intelligent instrument, be designated as x respectively ₁(t), x ₂(t) ..., x ₁₁(t).

Combustion System module, for the load variations according to boiler, is automatically regulated air quantity, coal amount, lime stone amount, disturbance cancelling, keeps stable steam quality, realized by following submodule:

2.1) boiler master module, for maintaining main steam pressure, and producing the instruction of t boiler load, being realized by following formula:

$u_1\left(t\right)=K_{P,1}\{S_1-x_1\left(t\right)+\frac{1}{T_{I,1}}{\∫}_0^t[S_1-x_1\left(t\right)]\mathrm{dt}+T_{D,1}\frac{d[S_1-x_1\left(t\right)]}{\mathrm{dt}}\}+90\frac{x_2\left(t\right)}{F_{d,e}}---\left(1\right)$

Wherein, u ₁t boiler load instruction that () exports for t boiler master, t represents the time, unit is second; K _{p, 1}, T _{i, 1}, T _{d, 1}be respectively the proportionality coefficient of boiler master controller, the time of integration, derivative time, determined by field adjustable; S ₁for the setting value of main steam pressure; F _d,efor the specified main steam flow of boiler, determined by the design parameter of boiler.

2.2) wind/combustion Coordination module, for the desired signal by paired for boiler load instruction transformation total blast volume, total coal amount, lime stone amount, by following process implementation:

2.2.1) the standard coal amount asking boiler heat consumption corresponding by following formula:

$u_{16}\left(t\right)=\frac{x_2[f_1(x_1,x_3)-f_2\left(x_4\right)]}{K_1}---\left(2\right)$

Wherein, u ₁₆t boiler load instruction that () exports for t boiler master, t represents the time, unit is second; f ₁() represents the main steam enthalpy determined by main steam pressure, main steam temperature, is realized by the physical property module of standard; f ₂() represents the Enthalpy of Feed Water determined by feed temperature, is realized by the physical property module of standard; K ₁for the caloric value of unit standard coal amount, equal the low heat valve of boiler design coal.

2.2.2) total for current reality coal-supplying amount is converted to standard coal amount, and coal conversion factor is marked in adjustment automatically, is produced by (3), (4) formula loop iteration:

u ₁₈(t)=[x ₇(t)+x ₈(t)]u ₁₇(t) （3）

$u_{17}\left(t\right)=1+\frac{1}{250}\left\{\frac{1}{T_{I,2}}{\∫}_0^t\right[u_{16}\left(t\right)-u_{18}\left(t\right)]\mathrm{dt}-50\}---\left(4\right)$

Wherein, u ₁₈t () is t standard coal amount; u ₁₇t () is t mark coal conversion factor, t represents the time, unit is second; T _{i, 2}for the automatic regulation time constant of mark coal conversion factor, determined by field adjustable.

2.2.3) t total blast volume desired signal is produced by following formula:

u ₂(t)=max[K ₂u ₁(t),0.95K ₃u ₁₈(t))] （5）

Wherein, u ₂t () is t total blast volume desired signal, t represents the time, unit is second; K ₂for the basic total blast volume demand of unit load instruction, determined by the design parameter of boiler; K ₃for the basic total blast volume demand of unit standard coal amount, determined by the design parameter of boiler; A numerical value larger in a, b is got in max (a, b) expression.

2.2.4) t total coal amount desired signal is produced by following formula:

$u_3\left(t\right)=\min \{K_4{u}_1\left(t\right),1.05\frac{1}{K_3}[x_5\left(t\right)+x_6\left(t\right)\left]\right\}---\left(6\right)$

Wherein, u ₃t () is t total coal amount desired signal, t represents the time, unit is second; K ₄for basic total coal amount demand of unit load instruction, determined by the design parameter of boiler; A numerical value less in a, b is got in min (a, b) expression.

2.2.5) t lime stone amount desired signal is produced by following formula:

$u_4\left(t\right)=\frac{u_3\left(t\right)}{K_5}---\left(7\right)$

Wherein, u ₄t () is t lime stone amount desired signal, t represents the time, unit is second; K ₅coal amount is coarse adjustment coefficient with the ratio of lime stone amount, determines according to boiler design parameter.

2.3) Boiler pressure control module, for ensureing the requirement of boiler load instruction to total blast volume and primary air flow, secondary air flow, and overcomes the disturbance from wind side, by following process implementation:

2.3.1) t total blast volume command signal is produced by following formula:

$u_5\left(t\right)=K_{P,3}[u_2\left(t\right)-x_5\left(t\right)-x_6\left(t\right)+\frac{1}{T_{I,3}}{\∫}_0^t(u_2\left(t\right)-x_5\left(t\right)-x_6\left(t\right))\mathrm{dt}]$

Wherein, u ₅(t) for t total blast volume command signal, t represent the time, unit is second; K _{p, 3}, T _{i, 3}be respectively the proportionality coefficient of total air volume control device, the time of integration, determined by field adjustable.

2.3.2) t oxygen amount corrected signal is produced by following formula:

$u_{19}\left(t\right)=1+\frac{1}{250}\left\{K_{P,4}\right\{[S_2-x_{10}\left(t\right)]+\frac{1}{T_{I,4}}{\∫}_0^t[S_2-x_{10}\left(t\right)]\mathrm{dt}\}-50\}---\left(9\right)$

Wherein, u ₁₉t () is t oxygen amount corrected signal; K _{p, 4}, T _{i, 4}be respectively the proportionality coefficient of total air volume control device, the time of integration, determined by field adjustable; S ₂for the setting value of flue gas oxygen content.

2.3.3) produce the desired value of t primary air flow, secondary air flow according to the requirement of total blast volume command signal and bed temperature correction, oxygen amount correction, realized by (10), (11) formula:

u ₆(t)=K ₆f ₃[x ₂(t)]u ₅(t)+0.001S ₃f _p,max（10）

u ₇(t)=u ₁₉(t){(1-K ₆)f ₄[x ₂(t)]u ₅(t)-0.001S ₃f _p,max} （11）

Wherein, u ₆t () is the desired value of t primary air flow; K ₆represent that primary air flow accounts for the coarse adjustment proportionality coefficient of total blast volume, span is 0.2 ~ 0.8, determines according to boiler design parameter; f ₃() represents the polygronal function that boiler load factor is revised primary air flow distribution coefficient, and output area is 0.8 ~ 1.2, determines when Boiler debugging; S ₃for bed temperature correction factor, span is-50 ~ 50, is arranged according to practical operation situation by operating personnel; f _{p, max}for maximum primary air flow, determine according to primary air fan parameter; u ₇t () is the desired value of t secondary air flow; f ₄() represents the polygronal function that boiler load factor is revised secondary air flow distribution coefficient, and output area is 0.8 ~ 1.2, determines when Boiler debugging.

2.3.4) according to the desired value of primary air flow, secondary air flow, the command signal of t primary air flow, secondary air flow actuator is produced by (12), (13) formula:

$u_8\left(t\right)=K_{P,5}\{u_6\left(t\right)-x_5\left(t\right)+\frac{1}{T_{I,5}}{\∫}_0^t[u_6\left(t\right)-x_5\left(t\right)\left]\mathrm{dt}\right\}---\left(12\right)$

$u_9\left(t\right)=K_{P,6}\{u_7\left(t\right)-x_6\left(t\right)+\frac{1}{T_{I,6}}{\∫}_0^t[u_7\left(t\right)-x_6\left(t\right)\left]\mathrm{dt}\right\}---\left(13\right)$

Wherein, u ₈t () is the command signal of t primary air flow actuator; K _{p, 5}, T _{i, 5}be respectively the proportionality coefficient of Primary air flow control device, the time of integration, determined by field adjustable; u ₉t () is the command signal of t secondary air flow actuator; K _{p, 6}, T _{i, 6}be respectively the proportionality coefficient of secondary air flow controller, the time of integration, determined by field adjustable.

2.4) coal amount control module, for ensureing the requirement of boiler load instruction to total coal amount, #1 coal supply machine-made egg-shaped or honey-comb coal briquets amount, #2 coal supply machine-made egg-shaped or honey-comb coal briquets amount, and overcoming the disturbance from fuel-side, being realized by (14) ~ (16) formula:

$u_{10}\left(t\right)=K_{P,7}\{u_3\left(t\right)-x_7\left(t\right)-x_8\left(t\right)+\frac{1}{T_{I,7}}{\∫}_0^t[u_3\left(t\right)-x_7\left(t\right)-x_8\left(t\right)\left]\mathrm{dt}\right\}---\left(14\right)$

u ₁₁(t)=u ₁₀(t)+S ₄（15）

u ₁₂(t)=u ₁₀(t)-S ₄（16）

Wherein, u ₁₀t coal amount command signal that () exports for the total coal amount control of t; K _{p, 7}, T _{i, 7}be respectively the proportionality coefficient of total coal amount controller, the time of integration, determined by field adjustable; u ₁₁(t), u ₁₂t () is respectively the command signal of t #1, #2 feeder actuator; S ₄for Coal feeder bias setting value, span is-20 ~ 20, is arranged according to practical operation situation by operating personnel.

2.5) Wind rate control module, for by the adjustment to lime stone amount, makes SO 2 from fume content meet the demands, and is realized by (17), (18) formula:

$u_{13}\left(t\right)=u_4\left(t\right)K_{P,8}\{S_5-x_{11}\left(t\right)+\frac{1}{T_{I,8}}{\∫}_0^t[S_5-x_{11}\left(t\right)\left]\mathrm{dt}\right\}---\left(17\right)$

$u_{14}\left(t\right)=K_{P,9}\{u_{13}\left(t\right)-x_9\left(t\right)+\frac{1}{T_{I,9}}{\∫}_0^t[u_{13}\left(t\right)-x_9\left(t\right)\left]\mathrm{dt}\right\}---\left(18\right)$

Wherein, u ₁₃t () is the desired value of t lime stone amount; K _{p, 8}, T _{i, 8}be respectively the proportionality coefficient of lime stone amount master controller, the time of integration, determined by field adjustable; S ₅for the setting value of SO 2 from fume content; u ₁₄t () is the command signal of t lime stone feed actuator; K _{p, 9}, T _{i, 9}be respectively the proportionality coefficient of lime stone amount submaster controller, the time of integration, determined by field adjustable.

Command output module, for being sent to on-the-spot actuator by the above actuator command signal.

Operation display module, for the duty of the real-time parameter and each controller that show CFBB, and accepts the setting value input of operator, the manual/auto switching of controller and the input of manual control signal.

A kind of Process of Circulating Fluidized Bed Boiler autocontrol method, described autocontrol method comprises the following steps:

1) by the sampling time interval of setting, gather the live signal of main steam pressure, main steam flow, main steam temperature, feed temperature, primary air flow, secondary air flow, #1 coal supply machine-made egg-shaped or honey-comb coal briquets amount, #2 coal supply machine-made egg-shaped or honey-comb coal briquets amount, lime stone amount, flue gas oxygen content, SO 2 from fume content from field intelligent instrument, be designated as x respectively ₁(t), x ₂(t) ..., x ₁₁(t).

2) according to the load variations of boiler, automatically regulate air quantity, coal amount, lime stone amount, disturbance cancelling, keep stable steam quality, realized by following sub-step:

2.1) maintain main steam pressure, and produce the instruction of t boiler load, realized by following formula:

$u_1\left(t\right)=K_{P,1}\{S_1-x_1\left(t\right)+\frac{1}{T_{I,1}}{\∫}_0^t[S_1-x_1\left(t\right)]\mathrm{dt}+T_{D,1}\frac{d[S_1-x_1\left(t\right)]}{\mathrm{dt}}\}+90\frac{x_2\left(t\right)}{F_{d,e}}---\left(1\right)$

Wherein, u ₁t boiler load instruction that () exports for t boiler master, t represents the time, unit is second; K _{p, 1}, T _{i, 1}, T _{d, 1}be respectively the proportionality coefficient of boiler master controller, the time of integration, derivative time, determined by field adjustable; S ₁for the setting value of main steam pressure; F _d,efor the specified main steam flow of boiler, determined by the design parameter of boiler.

2.2) by the desired signal of paired for boiler load instruction transformation total blast volume, total coal amount, lime stone amount, by following process implementation:

2.2.1) the standard coal amount asking boiler heat consumption corresponding by following formula:

$u_{16}\left(t\right)=\frac{x_2[f_1(x_1,x_3)-f_2\left(x_4\right)]}{K_1}---\left(2\right)$

Wherein, u ₁₆t boiler load instruction that () exports for t boiler master, t represents the time, unit is second; f ₁() represents the main steam enthalpy determined by main steam pressure, main steam temperature, is realized by the physical property module of standard; f ₂() represents the Enthalpy of Feed Water determined by feed temperature, is realized by the physical property module of standard; K ₁for the caloric value of unit standard coal amount, equal the low heat valve of boiler design coal.

2.2.2) total for current reality coal-supplying amount is converted to standard coal amount, and coal conversion factor is marked in adjustment automatically, is produced by (3), (4) formula loop iteration:

u ₁₈(t)=[x ₇(t)+x ₈(t)]u ₁₇(t) （3）

$u_{17}\left(t\right)=1+\frac{1}{250}\left\{\frac{1}{T_{I,2}}{\∫}_0^t\right[u_{16}\left(t\right)-u_{18}\left(t\right)]\mathrm{dt}-50\}---\left(4\right)$

Wherein, u ₁₈t () is t standard coal amount; u ₁₇t () is t mark coal conversion factor, t represents the time, unit is second; T _{i, 2}for the automatic regulation time constant of mark coal conversion factor, determined by field adjustable.

2.2.3) t total blast volume desired signal is produced by following formula:

u ₂(t)=max[K ₂u ₁(t),0.95K ₃u ₁₈(t))] （5）

Wherein, u ₂t () is t total blast volume desired signal, t represents the time, unit is second; K ₂for the basic total blast volume demand of unit load instruction, determined by the design parameter of boiler; K ₃for the basic total blast volume demand of unit standard coal amount, determined by the design parameter of boiler; A numerical value larger in a, b is got in max (a, b) expression.

2.2.4) t total coal amount desired signal is produced by following formula:

$u_3\left(t\right)=\min \{K_4{u}_1\left(t\right),1.05\frac{1}{K_3}[x_5\left(t\right)+x_6\left(t\right)\left]\right\}---\left(6\right)$

Wherein, u ₃t () is t total coal amount desired signal, t represents the time, unit is second; K ₄for basic total coal amount demand of unit load instruction, determined by the design parameter of boiler; A numerical value less in a, b is got in min (a, b) expression.

2.2.5) t lime stone amount desired signal is produced by following formula:

$u_4\left(t\right)=\frac{u_3\left(t\right)}{K_5}---\left(7\right)$

Wherein, u ₄t () is t lime stone amount desired signal, t represents the time, unit is second; K ₅coal amount is coarse adjustment coefficient with the ratio of lime stone amount, determines according to boiler design parameter.

2.3) ensure the boiler load instruction requirement to total blast volume and primary air flow, secondary air flow, and overcome the disturbance from wind side, by following process implementation:

2.3.1) t total blast volume command signal is produced by following formula:

$u_5\left(t\right)=K_{P,3}[u_2\left(t\right)-x_5\left(t\right)-x_6\left(t\right)+\frac{1}{T_{I,3}}{\∫}_0^t(u_2\left(t\right)-x_5\left(t\right)-x_6\left(t\right))\mathrm{dt}]$

Wherein, u ₅(t) for t total blast volume command signal, t represent the time, unit is second; K _{p, 3}, T _{i, 3}be respectively the proportionality coefficient of total air volume control device, the time of integration, determined by field adjustable.

2.3.2) t oxygen amount corrected signal is produced by following formula:

$u_{19}\left(t\right)=1+\frac{1}{250}\left\{K_{P,4}\right\{[S_2-x_{10}\left(t\right)]+\frac{1}{T_{I,4}}{\∫}_0^t[S_2-x_{10}\left(t\right)]\mathrm{dt}\}-50\}---\left(9\right)$

Wherein, u ₁₉t () is t oxygen amount corrected signal; K _{p, 4}, T _{i, 4}be respectively the proportionality coefficient of total air volume control device, the time of integration, determined by field adjustable; S ₂for the setting value of flue gas oxygen content.

2.3.3) produce the desired value of t primary air flow, secondary air flow according to the requirement of total blast volume command signal and bed temperature correction, oxygen amount correction, realized by (10), (11) formula:

u ₆(t)=K ₆f ₃[x ₂(t)]u ₅(t)+0.001S ₃f _p,max（10）

u ₇(t)=u ₁₉(t){(1-K ₆)f ₄[x ₂(t)]u ₅(t)-0.001S ₃f _p,max} （11）

Wherein, u ₆t () is the desired value of t primary air flow, t represents the time, unit is second; K ₆represent that primary air flow accounts for the coarse adjustment proportionality coefficient of total blast volume, span is 0.2 ~ 0.8, determines according to boiler design parameter; f ₃() represents the polygronal function that boiler load factor is revised primary air flow distribution coefficient, and output area is 0.8 ~ 1.2, determines when Boiler debugging; S ₃for bed temperature correction factor, span is-50 ~ 50, is arranged according to practical operation situation by operating personnel; f _{p, max}for maximum primary air flow, determine according to primary air fan parameter; u ₇t () is the desired value of t secondary air flow; f ₄() represents the polygronal function that boiler load factor is revised secondary air flow distribution coefficient, and output area is 0.8 ~ 1.2, determines when Boiler debugging.

2.3.4) according to the desired value of primary air flow, secondary air flow, the command signal of t primary air flow, secondary air flow actuator is produced by (12), (13) formula:

$u_8\left(t\right)=K_{P,5}\{u_6\left(t\right)-x_5\left(t\right)+\frac{1}{T_{I,5}}{\∫}_0^t[u_6\left(t\right)-x_5\left(t\right)\left]\mathrm{dt}\right\}---\left(12\right)$

$u_9\left(t\right)=K_{P,6}\{u_7\left(t\right)-x_6\left(t\right)+\frac{1}{T_{I,6}}{\∫}_0^t[u_7\left(t\right)-x_6\left(t\right)\left]\mathrm{dt}\right\}---\left(13\right)$

Wherein, u ₈t () is the command signal of t primary air flow actuator, t represents the time, unit is second; K _{p, 5}, T _{i, 5}be respectively the proportionality coefficient of Primary air flow control device, the time of integration, determined by field adjustable; u ₉t () is the command signal of t secondary air flow actuator; K _{p, 6}, T _{i, 6}be respectively the proportionality coefficient of secondary air flow controller, the time of integration, determined by field adjustable.

2.4) ensure that boiler load instruction is to the requirement of total coal amount, #1 coal supply machine-made egg-shaped or honey-comb coal briquets amount, #2 coal supply machine-made egg-shaped or honey-comb coal briquets amount, and overcome the disturbance from fuel-side, realized by (14) ~ (16) formula:

$u_{10}\left(t\right)=K_{P,7}\{u_3\left(t\right)-x_7\left(t\right)-x_8\left(t\right)+\frac{1}{T_{I,7}}{\∫}_0^t[u_3\left(t\right)-x_7\left(t\right)-x_8\left(t\right)\left]\mathrm{dt}\right\}---\left(14\right)$

u ₁₁(t)=u ₁₀(t)+S ₄（15）

u ₁₂(t)=u ₁₀(t)-S ₄（16）

Wherein, u ₁₀t coal amount command signal that () exports for the total coal amount control of t, t represents the time, unit is second; K _{p, 7}, T _{i, 7}be respectively the proportionality coefficient of total coal amount controller, the time of integration, determined by field adjustable; u ₁₁(t), u ₁₂t () is respectively the command signal of t #1, #2 feeder actuator; S ₄for Coal feeder bias setting value, span is-20 ~ 20, is arranged according to practical operation situation by operating personnel.

2.5) by the adjustment to lime stone amount, SO 2 from fume content is met the demands, is realized by (17), (18) formula:

$u_{13}\left(t\right)=u_4\left(t\right)K_{P,8}\{S_5-x_{11}\left(t\right)+\frac{1}{T_{I,8}}{\∫}_0^t[S_5-x_{11}\left(t\right)\left]\mathrm{dt}\right\}---\left(17\right)$

$u_{14}\left(t\right)=K_{P,9}\{u_{13}\left(t\right)-x_9\left(t\right)+\frac{1}{T_{I,9}}{\∫}_0^t[u_{13}\left(t\right)-x_9\left(t\right)\left]\mathrm{dt}\right\}---\left(18\right)$

Wherein, u ₁₃t () is the desired value of t lime stone amount, t represents the time, unit is second; K _{p, 8}, T _{i, 8}be respectively the proportionality coefficient of lime stone amount master controller, the time of integration, determined by field adjustable; S ₅for the setting value of SO 2 from fume content; u ₁₄t () is the command signal of t lime stone feed actuator; K _{p, 9}, T _{i, 9}be respectively the proportionality coefficient of lime stone amount submaster controller, the time of integration, determined by field adjustable.

3) the above actuator command signal is sent to on-the-spot actuator.

4) show the real-time parameter of CFBB and the duty of each controller, and accept the setting value input of operator, the manual/auto switching of controller and the input of manual control signal.

Beneficial effect of the present invention is mainly manifested in: in real time according to the change of boiler operatiopn condition, automatic adjustment air quantity, coal amount, lime stone amount, disturbance cancelling, keep stable steam quality, thus effectively improve the security of CFBB, the feature of environmental protection and economy, and fully reduce the labour intensity of operating personnel.

Accompanying drawing explanation

Fig. 1 is the hardware structure diagram of system proposed by the invention.

Fig. 2 is the functional block diagram of control station of the present invention.

Fig. 3 is the sub-function module figure of Combustion System module of the present invention.

Detailed description of the invention

Below in conjunction with drawings and Examples, the invention will be further described.

Embodiment 1

With reference to Fig. 1, Fig. 2, Fig. 3, a kind of Process of Circulating Fluidized Bed Boiler automatic control system, comprise the field intelligent instrument 2, data-interface 3, database 4, control station 5 and the host computer 6 that are connected with CFBB 1, field intelligent instrument 2 is connected with fieldbus, data/address bus is connected with data-interface 3, data-interface 3 is connected with database 4, control station 5 and host computer 6, and described control station 6 comprises:

Signal acquisition module 7, for the sampling time interval by setting, gather the live signal of main steam pressure, main steam flow, main steam temperature, feed temperature, primary air flow, secondary air flow, #1 coal supply machine-made egg-shaped or honey-comb coal briquets amount, #2 coal supply machine-made egg-shaped or honey-comb coal briquets amount, lime stone amount, flue gas oxygen content, SO 2 from fume content from field intelligent instrument, be designated as x respectively ₁(t), x ₂(t) ..., x ₁₁(t).

Combustion System module 8, for the load variations according to boiler, is automatically regulated air quantity, coal amount, lime stone amount, disturbance cancelling, keeps stable steam quality, realized by following submodule:

2.1) boiler master module 11, for maintaining main steam pressure, and producing the instruction of t boiler load, being realized by following formula:

$u_1\left(t\right)=K_{P,1}\{S_1-x_1\left(t\right)+\frac{1}{T_{I,1}}{\∫}_0^t[S_1-x_1\left(t\right)]\mathrm{dt}+T_{D,1}\frac{d[S_1-x_1\left(t\right)]}{\mathrm{dt}}\}+90\frac{x_2\left(t\right)}{F_{d,e}}---\left(1\right)$

Wherein, u ₁t boiler load instruction that () exports for t boiler master, t represents the time, unit is second; K _{p, 1}, T _{i, 1}, T _{d, 1}be respectively the proportionality coefficient of boiler master controller, the time of integration, derivative time, determined by field adjustable; S ₁for the setting value of main steam pressure; F _d,efor the specified main steam flow of boiler, determined by the design parameter of boiler.

2.2) wind/combustion Coordination module 12, for the desired signal by paired for boiler load instruction transformation total blast volume, total coal amount, lime stone amount, by following process implementation:

2.2.1) the standard coal amount asking boiler heat consumption corresponding by following formula:

$u_{16}\left(t\right)=\frac{x_2[f_1(x_1,x_3)-f_2\left(x_4\right)]}{K_1}---\left(2\right)$

Wherein, u ₁₆t boiler load instruction that () exports for t boiler master, t represents the time, unit is second; f ₁() represents the main steam enthalpy determined by main steam pressure, main steam temperature, is realized by the physical property module of standard; f ₂() represents the Enthalpy of Feed Water determined by feed temperature, is realized by the physical property module of standard; K ₁for the caloric value of unit standard coal amount, equal the low heat valve of boiler design coal.

2.2.2) total for current reality coal-supplying amount is converted to standard coal amount, and coal conversion factor is marked in adjustment automatically, is produced by (3), (4) formula loop iteration:

u ₁₈(t)=[x ₇(t)+x ₈(t)]u ₁₇(t) （3）

$u_{17}\left(t\right)=1+\frac{1}{250}\left\{\frac{1}{T_{I,2}}{\∫}_0^t\right[u_{16}\left(t\right)-u_{18}\left(t\right)]\mathrm{dt}-50\}---\left(4\right)$

Wherein, u ₁₈t () is t standard coal amount; u ₁₇t () is t mark coal conversion factor, t represents the time, unit is second; T _{i, 2}for the automatic regulation time constant of mark coal conversion factor, determined by field adjustable.

2.2.3) t total blast volume desired signal is produced by following formula:

u ₂(t)=max[K ₂u ₁(t),0.95K ₃u ₁₈(t))] （5）

Wherein, u ₂t () is t total blast volume desired signal, t represents the time, unit is second; K ₂for the basic total blast volume demand of unit load instruction, determined by the design parameter of boiler; K ₃for the basic total blast volume demand of unit standard coal amount, determined by the design parameter of boiler; A numerical value larger in a, b is got in max (a, b) expression.

2.2.4) t total coal amount desired signal is produced by following formula:

$u_3\left(t\right)=\min \{K_4{u}_1\left(t\right),1.05\frac{1}{K_3}[x_5\left(t\right)+x_6\left(t\right)\left]\right\}---\left(6\right)$

Wherein, u ₃t () is t total coal amount desired signal, t represents the time, unit is second; K ₄for basic total coal amount demand of unit load instruction, determined by the design parameter of boiler; A numerical value less in a, b is got in min (a, b) expression.

2.2.5) t lime stone amount desired signal is produced by following formula:

$u_4\left(t\right)=\frac{u_3\left(t\right)}{K_5}---\left(7\right)$

Wherein, u ₄t () is t lime stone amount desired signal, t represents the time, unit is second; K ₅coal amount is coarse adjustment coefficient with the ratio of lime stone amount, determines according to boiler design parameter.

2.3) Boiler pressure control module 13, for ensureing the requirement of boiler load instruction to total blast volume and primary air flow, secondary air flow, and overcomes the disturbance from wind side, by following process implementation:

2.3.1) t total blast volume command signal is produced by following formula:

$u_5\left(t\right)=K_{P,3}[u_2\left(t\right)-x_5\left(t\right)-x_6\left(t\right)+\frac{1}{T_{I,3}}{\∫}_0^t(u_2\left(t\right)-x_5\left(t\right)-x_6\left(t\right))\mathrm{dt}]$

Wherein, u ₅(t) for t total blast volume command signal, t represent the time, unit is second; K _{p, 3}, T _{i, 3}be respectively the proportionality coefficient of total air volume control device, the time of integration, determined by field adjustable.

2.3.2) t oxygen amount corrected signal is produced by following formula:

$u_{19}\left(t\right)=1+\frac{1}{250}\left\{K_{P,4}\right\{[S_2-x_{10}\left(t\right)]+\frac{1}{T_{I,4}}{\∫}_0^t[S_2-x_{10}\left(t\right)]\mathrm{dt}\}-50\}---\left(9\right)$

Wherein, u ₁₉t () is oxygen amount corrected signal; K _{p, 4}, T _{i, 4}be respectively the proportionality coefficient of total air volume control device, the time of integration, determined by field adjustable; S ₂for the setting value of flue gas oxygen content.

2.3.3) produce the desired value of t primary air flow, secondary air flow according to the requirement of total blast volume command signal and bed temperature correction, oxygen amount correction, realized by (10), (11) formula:

u ₆(t)=K ₆f ₃[x ₂(t)]u ₅(t)+0.001S ₃f _p,max（10）

u ₇(t)=u ₁₉(t){(1-K ₆)f ₄[x ₂(t)]u ₅(t)-0.001S ₃f _p,max} （11）

Wherein, u ₆t () is the desired value of t primary air flow, t represents the time, unit is second; K ₆represent that primary air flow accounts for the coarse adjustment proportionality coefficient of total blast volume, span is 0.2 ~ 0.8, determines according to boiler design parameter; f ₃() represents the polygronal function that boiler load factor is revised primary air flow distribution coefficient, and output area is 0.8 ~ 1.2, determines when Boiler debugging; S ₃for bed temperature correction factor, span is-50 ~ 50, is arranged according to practical operation situation by operating personnel; f _{p, max}for maximum primary air flow, determine according to primary air fan parameter; u ₇t () is the desired value of t secondary air flow; f ₄() represents the polygronal function that boiler load factor is revised secondary air flow distribution coefficient, and output area is 0.8 ~ 1.2, determines when Boiler debugging.

2.3.4) according to the desired value of primary air flow, secondary air flow, the command signal of t primary air flow, secondary air flow actuator is produced by (12), (13) formula:

$u_8\left(t\right)=K_{P,5}\{u_6\left(t\right)-x_5\left(t\right)+\frac{1}{T_{I,5}}{\∫}_0^t[u_6\left(t\right)-x_5\left(t\right)\left]\mathrm{dt}\right\}---\left(12\right)$

$u_9\left(t\right)=K_{P,6}\{u_7\left(t\right)-x_6\left(t\right)+\frac{1}{T_{I,6}}{\∫}_0^t[u_7\left(t\right)-x_6\left(t\right)\left]\mathrm{dt}\right\}---\left(13\right)$

Wherein, u ₈t () is the command signal of t primary air flow actuator, t represents the time, unit is second; K _{p, 5}, T _{i, 5}be respectively the proportionality coefficient of Primary air flow control device, the time of integration, determined by field adjustable; u ₉t () is the command signal of t secondary air flow actuator; K _{p, 6}, T _{i, 6}be respectively the proportionality coefficient of secondary air flow controller, the time of integration, determined by field adjustable.

2.4) coal amount control module 14, for ensureing the requirement of boiler load instruction to total coal amount, #1 coal supply machine-made egg-shaped or honey-comb coal briquets amount, #2 coal supply machine-made egg-shaped or honey-comb coal briquets amount, and overcoming the disturbance from fuel-side, being realized by (14) ~ (16) formula:

$u_{10}\left(t\right)=K_{P,7}\{u_3\left(t\right)-x_7\left(t\right)-x_8\left(t\right)+\frac{1}{T_{I,7}}{\∫}_0^t[u_3\left(t\right)-x_7\left(t\right)-x_8\left(t\right)\left]\mathrm{dt}\right\}---\left(14\right)$

u ₁₁(t)=u ₁₀(t)+S ₄（15）

u ₁₂(t)=u ₁₀(t)-S ₄（16）

Wherein, u ₁₀t coal amount command signal that () exports for the total coal amount control of t, t represents the time, unit is second; K _{p, 7}, T _{i, 7}be respectively the proportionality coefficient of total coal amount controller, the time of integration, determined by field adjustable; u ₁₁(t), u ₁₂t () is respectively the command signal of t #1, #2 feeder actuator; S ₄for Coal feeder bias setting value, span is-20 ~ 20, is arranged according to practical operation situation by operating personnel.

2.5) Wind rate control module 15, for by the adjustment to lime stone amount, makes SO 2 from fume content meet the demands, and is realized by (17), (18) formula:

$u_{13}\left(t\right)=u_4\left(t\right)K_{P,8}\{S_5-x_{11}\left(t\right)+\frac{1}{T_{I,8}}{\∫}_0^t[S_5-x_{11}\left(t\right)\left]\mathrm{dt}\right\}---\left(17\right)$

$u_{14}\left(t\right)=K_{P,9}\{u_{13}\left(t\right)-x_9\left(t\right)+\frac{1}{T_{I,9}}{\∫}_0^t[u_{13}\left(t\right)-x_9\left(t\right)\left]\mathrm{dt}\right\}---\left(18\right)$

Wherein, u ₁₃t () is the desired value of t lime stone amount, t represents the time, unit is second; K _{p, 8}, T _{i, 8}be respectively the proportionality coefficient of lime stone amount master controller, the time of integration, determined by field adjustable; S ₅for the setting value of SO 2 from fume content; u ₁₄t () is the command signal of t lime stone feed actuator; K _{p, 9}, T _{i, 9}be respectively the proportionality coefficient of lime stone amount submaster controller, the time of integration, determined by field adjustable.

Command output module 9, for being sent to on-the-spot actuator by the above actuator command signal.

Operation display module 10, for the duty of the real-time parameter and each controller that show CFBB, and accepts the setting value input of operator, the manual/auto switching of controller and the input of manual control signal.

Embodiment 2

With reference to Fig. 1, Fig. 2, Fig. 3, a kind of Process of Circulating Fluidized Bed Boiler autocontrol method, described Forecasting Methodology comprises the following steps:

1) by the sampling time interval of setting, gather the live signal of main steam pressure, main steam flow, main steam temperature, feed temperature, primary air flow, secondary air flow, #1 coal supply machine-made egg-shaped or honey-comb coal briquets amount, #2 coal supply machine-made egg-shaped or honey-comb coal briquets amount, lime stone amount, flue gas oxygen content, SO 2 from fume content from field intelligent instrument, be designated as x respectively ₁(t), x ₂(t) ..., x ₁₁(t).

2) according to the load variations of boiler, automatically regulate air quantity, coal amount, lime stone amount, disturbance cancelling, keep stable steam quality, realized by following sub-step:

2.1) maintain main steam pressure, and produce the instruction of t boiler load, realized by following formula:

$u_1\left(t\right)=K_{P,1}\{S_1-x_1\left(t\right)+\frac{1}{T_{I,1}}{\∫}_0^t[S_1-x_1\left(t\right)]\mathrm{dt}+T_{D,1}\frac{d[S_1-x_1\left(t\right)]}{\mathrm{dt}}\}+90\frac{x_2\left(t\right)}{F_{d,e}}---\left(1\right)$

Wherein, u ₁t boiler load instruction that () exports for t boiler master, t represents the time, unit is second; K _{p, 1}, T _{i, 1}, T _{d, 1}be respectively the proportionality coefficient of boiler master controller, the time of integration, derivative time, determined by field adjustable; S ₁for the setting value of main steam pressure; F _d,efor the specified main steam flow of boiler, determined by the design parameter of boiler.

2.2) by the desired signal of paired for boiler load instruction transformation total blast volume, total coal amount, lime stone amount, by following process implementation:

2.2.1) the standard coal amount asking boiler heat consumption corresponding by following formula:

$u_{16}\left(t\right)=\frac{x_2[f_1(x_1,x_3)-f_2\left(x_4\right)]}{K_1}---\left(2\right)$

Wherein, u ₁₆t boiler load instruction that () exports for t boiler master, t represents the time, unit is second; f ₁() represents the main steam enthalpy determined by main steam pressure, main steam temperature, is realized by the physical property module of standard; f ₂() represents the Enthalpy of Feed Water determined by feed temperature, is realized by the physical property module of standard; K ₁for the caloric value of unit standard coal amount, equal the low heat valve of boiler design coal.

2.2.2) total for current reality coal-supplying amount is converted to standard coal amount, and coal conversion factor is marked in adjustment automatically, is produced by (3), (4) formula loop iteration:

u ₁₈(t)=[x ₇(t)+x ₈(t)]u ₁₇(t) （3）

$u_{17}\left(t\right)=1+\frac{1}{250}\left\{\frac{1}{T_{I,2}}{\∫}_0^t\right[u_{16}\left(t\right)-u_{18}\left(t\right)]\mathrm{dt}-50\}---\left(4\right)$

Wherein, u ₁₈t () is t standard coal amount; u ₁₇t () is t mark coal conversion factor, t represents the time, unit is second; T _{i, 2}for the automatic regulation time constant of mark coal conversion factor, determined by field adjustable.

2.2.3) t total blast volume desired signal is produced by following formula:

u ₂(t)=max[K ₂u ₁(t),0.95K ₃u ₁₈(t))] （5）

Wherein, u ₂t () is t total blast volume desired signal, t represents the time, unit is second; K ₂for the basic total blast volume demand of unit load instruction, determined by the design parameter of boiler; K ₃for the basic total blast volume demand of unit standard coal amount, determined by the design parameter of boiler; A numerical value larger in a, b is got in max (a, b) expression.

2.2.4) t total coal amount desired signal is produced by following formula:

$u_3\left(t\right)=\min \{K_4{u}_1\left(t\right),1.05\frac{1}{K_3}[x_5\left(t\right)+x_6\left(t\right)\left]\right\}---\left(6\right)$

Wherein, u ₃t () is t total coal amount desired signal, t represents the time, unit is second; K ₄for basic total coal amount demand of unit load instruction, determined by the design parameter of boiler; A numerical value less in a, b is got in min (a, b) expression.

2.2.5) t lime stone amount desired signal is produced by following formula:

$u_4\left(t\right)=\frac{u_3\left(t\right)}{K_5}---\left(7\right)$

Wherein, u ₄t () is t lime stone amount desired signal, t represents the time, unit is second; K ₅coal amount is coarse adjustment coefficient with the ratio of lime stone amount, determines according to boiler design parameter.

2.3) ensure the boiler load instruction requirement to total blast volume and primary air flow, secondary air flow, and overcome the disturbance from wind side, by following process implementation:

2.3.1) t total blast volume command signal is produced by following formula:

$u_5\left(t\right)=K_{P,3}[u_2\left(t\right)-x_5\left(t\right)-x_6\left(t\right)+\frac{1}{T_{I,3}}{\∫}_0^t(u_2\left(t\right)-x_5\left(t\right)-x_6\left(t\right))\mathrm{dt}]$

Wherein, u ₅(t) for t total blast volume command signal, t represent the time, unit is second; K _{p, 3}, T _{i, 3}be respectively the proportionality coefficient of total air volume control device, the time of integration, determined by field adjustable.

2.3.2) t oxygen amount corrected signal is produced by following formula:

$u_{19}\left(t\right)=1+\frac{1}{250}\left\{K_{P,4}\right\{[S_2-x_{10}\left(t\right)]+\frac{1}{T_{I,4}}{\∫}_0^t[S_2-x_{10}\left(t\right)]\mathrm{dt}\}-50\}---\left(9\right)$

Wherein, u ₁₉t () is oxygen amount corrected signal; K _{p, 4}, T _{i, 4}be respectively the proportionality coefficient of total air volume control device, the time of integration, determined by field adjustable; S ₂for the setting value of flue gas oxygen content.

2.3.3) produce the desired value of t primary air flow, secondary air flow according to the requirement of total blast volume command signal and bed temperature correction, oxygen amount correction, realized by (10), (11) formula:

u ₆(t)=K ₆f ₃[x ₂(t)]u ₅(t)+0.001S ₃f _p,max（10）

u ₇(t)=u ₁₉(t){(1-K ₆)f ₄[x ₂(t)]u ₅(t)-0.001S ₃f _p,max} （11）

Wherein, u ₆t () is the desired value of t primary air flow, t represents the time, unit is second; K ₆represent that primary air flow accounts for the coarse adjustment proportionality coefficient of total blast volume, span is 0.2 ~ 0.8, determines according to boiler design parameter; f ₃() represents the polygronal function that boiler load factor is revised primary air flow distribution coefficient, and output area is 0.8 ~ 1.2, determines when Boiler debugging; S ₃for bed temperature correction factor, span is-50 ~ 50, is arranged according to practical operation situation by operating personnel; f _{p, max}for maximum primary air flow, determine according to primary air fan parameter; u ₇t () is the desired value of t secondary air flow; f ₄() represents the polygronal function that boiler load factor is revised secondary air flow distribution coefficient, and output area is 0.8 ~ 1.2, determines when Boiler debugging.

2.3.4) according to the desired value of primary air flow, secondary air flow, the command signal of t primary air flow, secondary air flow actuator is produced by (12), (13) formula:

$u_8\left(t\right)=K_{P,5}\{u_6\left(t\right)-x_5\left(t\right)+\frac{1}{T_{I,5}}{\∫}_0^t[u_6\left(t\right)-x_5\left(t\right)\left]\mathrm{dt}\right\}---\left(12\right)$

$u_9\left(t\right)=K_{P,6}\{u_7\left(t\right)-x_6\left(t\right)+\frac{1}{T_{I,6}}{\∫}_0^t[u_7\left(t\right)-x_6\left(t\right)\left]\mathrm{dt}\right\}---\left(13\right)$

Wherein, u ₈t () is the command signal of t primary air flow actuator, t represents the time, unit is second; K _{p, 5}, T _{i, 5}be respectively the proportionality coefficient of Primary air flow control device, the time of integration, determined by field adjustable; u ₉t () is the command signal of t secondary air flow actuator; K _{p, 6}, T _{i, 6}be respectively the proportionality coefficient of secondary air flow controller, the time of integration, determined by field adjustable.

2.4) ensure that boiler load instruction is to the requirement of total coal amount, #1 coal supply machine-made egg-shaped or honey-comb coal briquets amount, #2 coal supply machine-made egg-shaped or honey-comb coal briquets amount, and overcome the disturbance from fuel-side, realized by (14) ~ (16) formula:

$u_{10}\left(t\right)=K_{P,7}\{u_3\left(t\right)-x_7\left(t\right)-x_8\left(t\right)+\frac{1}{T_{I,7}}{\∫}_0^t[u_3\left(t\right)-x_7\left(t\right)-x_8\left(t\right)\left]\mathrm{dt}\right\}---\left(14\right)$

u ₁₁(t)=u ₁₀(t)+S ₄（15）

u ₁₂(t)=u ₁₀(t)-S ₄（16）

Wherein, u ₁₀t coal amount command signal that () exports for the total coal amount control of t, t represents the time, unit is second; K _{p, 7}, T _{i, 7}be respectively the proportionality coefficient of total coal amount controller, the time of integration, determined by field adjustable; u ₁₁(t), u ₁₂t () is respectively the command signal of t #1, #2 feeder actuator; S ₄for Coal feeder bias setting value, span is-20 ~ 20, is arranged according to practical operation situation by operating personnel.

2.5) by the adjustment to lime stone amount, SO 2 from fume content is met the demands, is realized by (17), (18) formula:

$u_{13}\left(t\right)=u_4\left(t\right)K_{P,8}\{S_5-x_{11}\left(t\right)+\frac{1}{T_{I,8}}{\∫}_0^t[S_5-x_{11}\left(t\right)\left]\mathrm{dt}\right\}---\left(17\right)$

$u_{14}\left(t\right)=K_{P,9}\{u_{13}\left(t\right)-x_9\left(t\right)+\frac{1}{T_{I,9}}{\∫}_0^t[u_{13}\left(t\right)-x_9\left(t\right)\left]\mathrm{dt}\right\}---\left(18\right)$

Wherein, u ₁₃t () is the desired value of t lime stone amount, t represents the time, unit is second; K _{p, 8}, T _{i, 8}be respectively the proportionality coefficient of lime stone amount master controller, the time of integration, determined by field adjustable; S ₅for the setting value of SO 2 from fume content; u ₁₄t () is the command signal of t lime stone feed actuator; K _{p, 9}, T _{i, 9}be respectively the proportionality coefficient of lime stone amount submaster controller, the time of integration, determined by field adjustable.

3) the above actuator command signal is sent to on-the-spot actuator.

4) show the real-time parameter of CFBB and the duty of each controller, and accept the setting value input of operator, the manual/auto switching of controller and the input of manual control signal.

Process of Circulating Fluidized Bed Boiler automatic control system proposed by the invention and method, be described by above-mentioned concrete implementation step, person skilled obviously can not depart from content of the present invention, spirit and scope device as herein described and method of operating are changed or suitably change with combination, realize the technology of the present invention.Special needs to be pointed out is, all similar replacements and change apparent to one skilled in the art, they all can be deemed to be included in spirit of the present invention, scope and content.

Claims (2)

1. a Process of Circulating Fluidized Bed Boiler automatic control system, is characterized in that, comprises the field intelligent instrument, control station and the host computer that are connected with CFBB; Field intelligent instrument is connected with control station, database and host computer, and described host computer comprises:

Signal acquisition module, for the sampling time interval by setting, gather the live signal of main steam pressure, main steam flow, main steam temperature, feed temperature, primary air flow, secondary air flow, #1 coal supply machine-made egg-shaped or honey-comb coal briquets amount, #2 coal supply machine-made egg-shaped or honey-comb coal briquets amount, lime stone amount, flue gas oxygen content, SO 2 from fume content from field intelligent instrument, be designated as x respectively ₁(t), x ₂(t) ..., x ₁₁(t), t represents the time, unit is second;

Combustion System module, for the load variations according to boiler, is automatically regulated air quantity, coal amount, lime stone amount, disturbance cancelling, keeps stable steam quality, realized by following submodule:

2.1) boiler master module, for maintaining main steam pressure, and producing the instruction of t boiler load, being realized by following formula:

$u_1\left(t\right)=K_{P,1}\{S_1-x_1\left(t\right)+\frac{1}{T_{I,1}}{\∫}_0^t[S_1-x_1\left(t\right)]\mathrm{dt}+T_{D,1}\frac{d[S_1-x_1\left(t\right)]}{\mathrm{dt}}\}+90\frac{x_2\left(t\right)}{F_{d,e}}---\left(1\right)$

Wherein, u ₁t boiler load instruction that () exports for t boiler master, t represents the time, unit is second; K _{p, 1}, T _{i, 1}, T _{d, 1}be respectively the proportionality coefficient of boiler master controller, the time of integration, derivative time, determined by field adjustable; S ₁for the setting value of main steam pressure; F _d,efor the specified main steam flow of boiler, determined by the design parameter of boiler;

2.2) wind/combustion Coordination module, for the desired signal by paired for boiler load instruction transformation total blast volume, total coal amount, lime stone amount, by following process implementation:

2.2.1) ask by following formula the standard coal amount that t boiler heat consumption is corresponding:

$u_{16}\left(t\right)=\frac{x_2[f_1(x_1,x_3)-f_2\left(x_4\right)]}{K_1}---\left(2\right)$

Wherein, u ₁₆t () is standard coal amount corresponding to t boiler heat consumption, t represents the time, unit is second; f ₁() represents the main steam enthalpy determined by main steam pressure, main steam temperature, is realized by the physical property module of standard; f ₂() represents the Enthalpy of Feed Water determined by feed temperature, is realized by the physical property module of standard; K ₁for the caloric value of unit standard coal amount, equal the low heat valve of boiler design coal;

2.2.2) total for current reality coal-supplying amount is converted to standard coal amount, and coal conversion factor is marked in adjustment automatically, is produced by (3), (4) formula loop iteration:

u ₁₈(t)＝[x ₇(t)+x ₈(t)]u ₁₇(t) (3)

$u_{17}\left(t\right)=1+\frac{1}{250}\left\{\frac{1}{T_{I,2}}{\∫}_0^t\right[u_{16}\left(t\right)-u_{18}\left(t\right)]\mathrm{dt}-50\}---\left(4\right)$

Wherein, u ₁₈t () is t standard coal amount; u ₁₇t () is t mark coal conversion factor, t represents the time, unit is second; T _{i, 2}for the automatic regulation time constant of mark coal conversion factor, determined by field adjustable;

2.2.3) t total blast volume desired signal is produced by following formula:

u ₂(t)＝max[K ₂u ₁(t),0.95K ₃u ₁₈(t))] (5)

Wherein, u ₂t () is t total blast volume desired signal, t represents the time, unit is second; K ₂for the basic total blast volume demand of unit load instruction, determined by the design parameter of boiler; K ₃for the basic total blast volume demand of unit standard coal amount, determined by the design parameter of boiler; A numerical value larger in a, b is got in max (a, b) expression;

2.2.4) t total coal amount desired signal is produced by following formula:

$u_3\left(t\right)=\min \{K_4{u}_1\left(t\right),1.05\frac{1}{K_3}[x_5\left(t\right)+x_6\left(t\right)\left]\right\}---\left(6\right)$

Wherein, u ₃t () is t total coal amount desired signal, t represents the time, unit is second; K ₄for basic total coal amount demand of unit load instruction, determined by the design parameter of boiler; A numerical value less in a, b is got in min (a, b) expression;

2.2.5) t lime stone amount desired signal is produced by following formula:

$u_4\left(t\right)=\frac{u_3\left(t\right)}{K_5}---\left(7\right)$

Wherein, u ₄t () is t lime stone amount desired signal, t represents the time, unit is second; K ₅coal amount is coarse adjustment coefficient with the ratio of lime stone amount, determines according to boiler design parameter;

2.3) Boiler pressure control module, for ensureing the requirement of boiler load instruction to total blast volume and primary air flow, secondary air flow, and overcomes the disturbance from wind side, by following process implementation:

2.3.1) t total blast volume command signal is produced by following formula:

$u_5\left(t\right)=K_{P,3}[u_2\left(t\right)-x_5\left(t\right)-x_6\left(t\right)+\frac{1}{T_{I,3}}{\∫}_0^t(u_2\left(t\right)-x_5\left(t\right)-x_6\left(t\right))\mathrm{dt}]$

Wherein, u ₅(t) for t total blast volume command signal, t represent the time, unit is second; K _{p, 3}, T _{i, 3}be respectively the proportionality coefficient of total air volume control device, the time of integration, determined by field adjustable;

2.3.2) t oxygen amount corrected signal is produced by following formula:

$u_{19}\left(t\right)=1+\frac{1}{250}\left\{K_{P,4}\right\{[S_2-x_{10}\left(t\right)]+\frac{1}{T_{I,4}}{\∫}_0^t[S_2-x_{10}\left(t\right)]\mathrm{dt}\}-50\}---\left(9\right)$

Wherein, u ₁₉(t) for t oxygen amount corrected signal, t represent the time, unit is second; K _{p, 4}, T _{i, 4}be respectively the proportionality coefficient of total air volume control device, the time of integration, determined by field adjustable; S ₂for the setting value of flue gas oxygen content;

2.3.3) produce the desired value of t primary air flow, secondary air flow according to the requirement of total blast volume command signal and bed temperature correction, oxygen amount correction, realized by (10), (11) formula:

u ₆(t)＝K ₆f ₃[x ₂(t)]u ₅(t)+0.001S ₃f _p,max(10)

u ₇(t)＝u ₁₉(t){(1-K ₆)f ₄[x ₂(t)]u ₅(t)-0.001S ₃f _p,max} (11)

Wherein, u ₆t () is the desired value of t primary air flow, t represents the time, unit is second; K ₆represent that primary air flow accounts for the coarse adjustment proportionality coefficient of total blast volume, span is 0.2 ~ 0.8, determines according to boiler design parameter; f ₃() represents the polygronal function that boiler load factor is revised primary air flow distribution coefficient, and output area is 0.8 ~ 1.2, determines when Boiler debugging; S ₃for bed temperature correction factor, span is-50 ~ 50, is arranged according to practical operation situation by operating personnel; f _{p, max}for maximum primary air flow, determine according to primary air fan parameter; u ₇t () is the desired value for t secondary air flow; f ₄() represents the polygronal function that boiler load factor is revised secondary air flow distribution coefficient, and output area is 0.8 ~ 1.2, determines when Boiler debugging;

2.3.4) according to the desired value of primary air flow, secondary air flow, the command signal of t primary air flow, secondary air flow actuator is produced by (12), (13) formula:

$u_8\left(t\right)=K_{P,5}\{u_6\left(t\right)-x_5\left(t\right)+\frac{1}{T_{I,5}}{\∫}_0^t[u_6\left(t\right)-x_5\left(t\right)\left]\mathrm{dt}\right\}---\left(12\right)$

$u_9\left(t\right)=K_{P,6}\{u_7\left(t\right)-x_6\left(t\right)+\frac{1}{T_{I,6}}{\∫}_0^t[u_7\left(t\right)-x_6\left(t\right)\left]\mathrm{dt}\right\}---\left(13\right)$

Wherein, u ₈t () is the command signal of t primary air flow actuator, t represents the time, unit is second; K _{p, 5}, T _{i, 5}be respectively the proportionality coefficient of Primary air flow control device, the time of integration, determined by field adjustable; u ₉t () is the command signal of t secondary air flow actuator; K _{p, 6}, T _{i, 6}be respectively the proportionality coefficient of secondary air flow controller, the time of integration, determined by field adjustable;

2.4) coal amount control module, for ensureing the requirement of boiler load instruction to total coal amount, #1 coal supply machine-made egg-shaped or honey-comb coal briquets amount, #2 coal supply machine-made egg-shaped or honey-comb coal briquets amount, and overcoming the disturbance from fuel-side, being realized by (14) ~ (16) formula:

$u_{10}\left(t\right)=K_{P,7}\{u_3\left(t\right)-x_7\left(t\right)-x_8\left(t\right)+\frac{1}{T_{I,7}}{\∫}_0^t[u_3\left(t\right)-x_7\left(t\right)-x_8\left(t\right)\left]\mathrm{dt}\right\}---\left(14\right)$

u ₁₁(t)＝u ₁₀(t)+S ₄(15)

u ₁₂(t)＝u ₁₀(t)-S ₄(16)

Wherein, u ₁₀t coal amount command signal that () exports for the total coal amount control of t, t represents the time, unit is second; K _{p, 7}, T _{i, 7}be respectively the proportionality coefficient of total coal amount controller, the time of integration, determined by field adjustable; u ₁₁(t), u ₁₂t () is respectively the command signal of t #1, #2 feeder actuator; S ₄for Coal feeder bias setting value, span is-20 ~ 20, is arranged according to practical operation situation by operating personnel;

2.5) Wind rate control module, for by the adjustment to lime stone amount, makes SO 2 from fume content meet the demands, and is realized by (17), (18) formula:

$u_{13}\left(t\right)=u_4\left(t\right)K_{P,8}\{S_5-x_{11}\left(t\right)+\frac{1}{T_{I,8}}{\∫}_0^t[S_5-x_{11}\left(t\right)\left]\mathrm{dt}\right\}---\left(17\right)$

$u_{14}\left(t\right)=K_{P,9}\{u_{13}\left(t\right)-x_9\left(t\right)+\frac{1}{T_{I,9}}{\∫}_0^t[u_{13}\left(t\right)-x_9\left(t\right)\left]\mathrm{dt}\right\}---\left(18\right)$

Wherein, u ₁₃t () is the desired value of t lime stone amount, t represents the time, unit is second; K _{p, 8}, T _{i, 8}be respectively the proportionality coefficient of lime stone amount master controller, the time of integration, determined by field adjustable; S ₅for the setting value of SO 2 from fume content; u ₁₄t () is the command signal of t lime stone feed actuator; K _{p, 9}, T _{i, 9}be respectively the proportionality coefficient of lime stone amount submaster controller, the time of integration, determined by field adjustable;

Command output module, for being sent to on-the-spot actuator by the above actuator command signal;

Operation display module, for the duty of the real-time parameter and each controller that show CFBB, and accepts the setting value input of operator, the manual/auto switching of controller and the input of manual control signal.

2., with the combustion process autocontrol method that Process of Circulating Fluidized Bed Boiler automatic control system according to claim 1 realizes, it is characterized in that, described autocontrol method comprises the following steps:

1) by the sampling time interval of setting, gather the live signal of main steam pressure, main steam flow, main steam temperature, feed temperature, primary air flow, secondary air flow, #1 coal supply machine-made egg-shaped or honey-comb coal briquets amount, #2 coal supply machine-made egg-shaped or honey-comb coal briquets amount, lime stone amount, flue gas oxygen content, SO 2 from fume content from field intelligent instrument, be designated as x respectively ₁(t), x ₂(t) ..., x ₁₁(t);

2) according to the load variations of boiler, automatically regulate air quantity, coal amount, lime stone amount, disturbance cancelling, keep stable steam quality, realized by following sub-step:

2.1) maintain main steam pressure, and produce the instruction of t boiler load, realized by following formula:

$u_1\left(t\right)=K_{P,1}\{S_1-x_1\left(t\right)+\frac{1}{T_{I,1}}{\∫}_0^t[S_1-x_1\left(t\right)]\mathrm{dt}+T_{D,1}\frac{d[S_1-x_1\left(t\right)]}{\mathrm{dt}}\}+90\frac{x_2\left(t\right)}{F_{d,e}}---\left(1\right)$

Wherein, u ₁t boiler load instruction that () exports for t boiler master, t represents the time, unit is second; K _{p, 1}, T _{i, 1}, T _{d, 1}be respectively the proportionality coefficient of boiler master controller, the time of integration, derivative time, determined by field adjustable; S ₁for the setting value of main steam pressure; F _d,efor the specified main steam flow of boiler, determined by the design parameter of boiler;

2.2) by the desired signal of paired for boiler load instruction transformation total blast volume, total coal amount, lime stone amount, by following process implementation:

2.2.1) the standard coal amount asking boiler heat consumption corresponding by following formula:

$u_{16}\left(t\right)=\frac{x_2[f_1(x_1,x_3)-f_2\left(x_4\right)]}{K_1}---\left(2\right)$

Wherein, u ₁₆t () is standard coal amount corresponding to t boiler heat consumption, t represents the time, unit is second; f ₁() represents the main steam enthalpy determined by main steam pressure, main steam temperature, is realized by the physical property module of standard; f ₂() represents the Enthalpy of Feed Water determined by feed temperature, is realized by the physical property module of standard; K ₁for the caloric value of unit standard coal amount, equal the low heat valve of boiler design coal;

2.2.2) total for current reality coal-supplying amount is converted to standard coal amount, and coal conversion factor is marked in adjustment automatically, is produced by (3), (4) formula loop iteration:

u ₁₈(t)＝[x ₇(t)+x ₈(t)]u ₁₇(t) (3)

$u_{17}\left(t\right)=1+\frac{1}{250}\left\{\frac{1}{T_{I,2}}{\∫}_0^t\right[u_{16}\left(t\right)-u_{18}\left(t\right)]\mathrm{dt}-50\}---\left(4\right)$

Wherein, u ₁₈t () is t standard coal amount; u ₁₇t () is t mark coal conversion factor, t represents the time, unit is second; T _{i, 2}for the automatic regulation time constant of mark coal conversion factor, determined by field adjustable;

2.2.3) t total blast volume desired signal is produced by following formula:

u ₂(t)＝max[K ₂u ₁(t),0.95K ₃u ₁₈(t)] (5)

Wherein, u ₂(t) for t total blast volume desired signal, t represent the time, unit is second, K ₂for the basic total blast volume demand of unit load instruction, determined by the design parameter of boiler; K ₃for the basic total blast volume demand of unit standard coal amount, determined by the design parameter of boiler; A numerical value larger in a, b is got in max (a, b) expression;

2.2.4) t total coal amount desired signal is produced by following formula:

$u_3\left(t\right)=\min \{K_4{u}_1\left(t\right),1.05\frac{1}{K_3}[x_5\left(t\right)+x_6\left(t\right)\left]\right\}---\left(6\right)$

Wherein, u ₃t () is t total coal amount desired signal, t represents the time, unit is second, K ₄for basic total coal amount demand of unit load instruction, determined by the design parameter of boiler; A numerical value less in a, b is got in min (a, b) expression;

2.2.5) t lime stone amount desired signal is produced by following formula:

$u_4\left(t\right)=\frac{u_3\left(t\right)}{K_5}---\left(7\right)$

Wherein, u ₄t () is t lime stone amount desired signal, t represents the time, unit is second, K ₅coal amount is coarse adjustment coefficient with the ratio of lime stone amount, determines according to boiler design parameter;

2.3) ensure the boiler load instruction requirement to total blast volume and primary air flow, secondary air flow, and overcome the disturbance from wind side, by following process implementation:

2.3.1) t total blast volume command signal is produced by following formula:

$u_5\left(t\right)=K_{P,3}[u_2\left(t\right)-x_5\left(t\right)-x_6\left(t\right)+\frac{1}{T_{I,3}}{\∫}_0^t(u_2\left(t\right)-x_5\left(t\right)-x_6\left(t\right))\mathrm{dt}]$

Wherein, u ₅(t) for t total blast volume command signal, t represent the time, unit is second; K _{p, 3}, T _{i, 3}be respectively the proportionality coefficient of total air volume control device, the time of integration, determined by field adjustable;

2.3.2) t oxygen amount corrected signal is produced by following formula:

$u_{19}\left(t\right)=1+\frac{1}{250}\left\{K_{P,4}\right\{[S_2-x_{10}\left(t\right)]+\frac{1}{T_{I,4}}{\∫}_0^t[S_2-x_{10}\left(t\right)]\mathrm{dt}\}-50\}---\left(9\right)$

Wherein, u ₁₉t () is t oxygen amount corrected signal; K _{p, 4}, T _{i, 4}be respectively the proportionality coefficient of total air volume control device, the time of integration, determined by field adjustable; S ₂for the setting value of flue gas oxygen content;

2.3.3) produce the desired value of t primary air flow, secondary air flow according to the requirement of total blast volume command signal and bed temperature correction, oxygen amount correction, realized by (10), (11) formula:

u ₆(t)＝K ₆f ₃[x ₂(t)]u ₅(t)+0.001S ₃f _p,max(10)

u ₇(t)＝u ₁₉(t){(1-K ₆)f ₄[x ₂(t)]u ₅(t)-0.001S ₃f _p,max} (11)

Wherein, u ₆t () is the desired value of t primary air flow; K ₆represent that primary air flow accounts for the coarse adjustment proportionality coefficient of total blast volume, span is 0.2 ~ 0.8, determines according to boiler design parameter; f ₃() represents the polygronal function that boiler load factor is revised primary air flow distribution coefficient, and output area is 0.8 ~ 1.2, determines when Boiler debugging; S ₃for bed temperature correction factor, span is-50 ~ 50, is arranged according to practical operation situation by operating personnel; f _{p, max}for maximum primary air flow, determine according to primary air fan parameter; u ₇t () is the desired value of t secondary air flow; f ₄() represents the polygronal function that boiler load factor is revised secondary air flow distribution coefficient, and output area is 0.8 ~ 1.2, determines when Boiler debugging;

2.3.4) according to the desired value of primary air flow, secondary air flow, the command signal of t primary air flow, secondary air flow actuator is produced by (12), (13) formula:

$u_8\left(t\right)=K_{P,5}\{u_6\left(t\right)-x_5\left(t\right)+\frac{1}{T_{I,5}}{\∫}_0^t[u_6\left(t\right)-x_5\left(t\right)\left]\mathrm{dt}\right\}---\left(12\right)$

$u_9\left(t\right)=K_{P,6}\{u_7\left(t\right)-x_6\left(t\right)+\frac{1}{T_{I,6}}{\∫}_0^t[u_7\left(t\right)-x_6\left(t\right)\left]\mathrm{dt}\right\}---\left(13\right)$

Wherein, u ₈t () is the command signal of t primary air flow actuator; K _{p, 5}, T _{i, 5}be respectively the proportionality coefficient of Primary air flow control device, the time of integration, determined by field adjustable; u ₉t () is the command signal of t secondary air flow actuator; K _{p, 6}, T _{i, 6}be respectively the proportionality coefficient of secondary air flow controller, the time of integration, determined by field adjustable;

2.4) ensure that boiler load instruction is to the requirement of total coal amount, #1 coal supply machine-made egg-shaped or honey-comb coal briquets amount, #2 coal supply machine-made egg-shaped or honey-comb coal briquets amount, and overcome the disturbance from fuel-side, realized by (14) ~ (16) formula:

$u_{10}\left(t\right)=K_{P,7}\{u_3\left(t\right)-x_7\left(t\right)-x_8\left(t\right)+\frac{1}{T_{I,7}}{\∫}_0^t[u_3\left(t\right)-x_7\left(t\right)-x_8\left(t\right)\left]\mathrm{dt}\right\}---\left(14\right)$

u ₁₁(t)＝u ₁₀(t)+S ₄(15)

u ₁₂(t)＝u ₁₀(t)-S ₄(16)

Wherein, u ₁₀t coal amount command signal that () exports for the total coal amount control of t; K _{p, 7}, T _{i, 7}be respectively the proportionality coefficient of total coal amount controller, the time of integration, determined by field adjustable; u ₁₁(t), u ₁₂t () is respectively the command signal of t #1, #2 feeder actuator; S ₄for Coal feeder bias setting value, span is-20 ~ 20, is arranged according to practical operation situation by operating personnel;

2.5) by the adjustment to lime stone amount, SO 2 from fume content is met the demands, is realized by (17), (18) formula:

$u_{13}\left(t\right)=u_4\left(t\right)K_{P,8}\{S_5-x_{11}\left(t\right)+\frac{1}{T_{I,8}}{\∫}_0^t[S_5-x_{11}\left(t\right)\left]\mathrm{dt}\right\}---\left(17\right)$

$u_{14}\left(t\right)=K_{P,9}\{u_{13}\left(t\right)-x_9\left(t\right)+\frac{1}{T_{I,9}}{\∫}_0^t[u_{13}\left(t\right)-x_9\left(t\right)\left]\mathrm{dt}\right\}---\left(18\right)$

Wherein, u ₁₃t () is the desired value of t lime stone amount; K _{p, 8}, T _{i, 8}be respectively the proportionality coefficient of lime stone amount master controller, the time of integration, determined by field adjustable; S ₅for the setting value of SO 2 from fume content; u ₁₄t () is the command signal of t lime stone feed actuator; K _{p, 9}, T _{i, 9}be respectively the proportionality coefficient of lime stone amount submaster controller, the time of integration, determined by field adjustable;

3) the above actuator command signal is sent to on-the-spot actuator;

4) show the real-time parameter of CFBB and the duty of each controller, and accept the setting value input of operator, the manual/auto switching of controller and the input of manual control signal.