CN104556146A - Device for rapidly responding to required ammonia amount changes in urea-hydrolysis ammonia preparation and implementation method of device - Google Patents
Device for rapidly responding to required ammonia amount changes in urea-hydrolysis ammonia preparation and implementation method of device Download PDFInfo
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- CN104556146A CN104556146A CN201410801336.8A CN201410801336A CN104556146A CN 104556146 A CN104556146 A CN 104556146A CN 201410801336 A CN201410801336 A CN 201410801336A CN 104556146 A CN104556146 A CN 104556146A
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Abstract
The invention discloses a device for rapidly responding to required ammonia amount changes in urea-hydrolysis ammonia preparation and an implementation method of the device, and mainly aims to solve the problem of low response speed in urea-hydrolysis ammonia preparation in the prior art. The device comprises a hydrolyzer, an ammonia gas flow control valve, a urine flow control valve, a urine input pipe, an ammonia gas output pipe, a signal analysis display alarming controller, a first signal converter and a second signal converter, wherein one end of the urine input pipe and one end of the ammonia gas output pipe are both communicated with the hydrolyzer; a signal output end of the signal analysis display alarming controller is connected with a signal input end of the first signal converter and the signal input end of the second signal converter respectively by signal wires; the signal output end of the first signal converter is connected with the ammonia gas flow control valve; the signal output end of the second signal converter is connected with the urine flow control valve. According to the scheme, the device disclosed by the invention has the advantage of realizing the aim of randomly controlling the yield of ammonia gas according to the amount of required ammonia and achieving high response speed in the urea-hydrolysis ammonia preparation.
Description
Technical field
The present invention relates to hydrolysis of urea responding device, specifically, relate to hydrolysis of urea ammonia and respond fast and need ammonia amount changeable device and and its implementation.
Background technology
Containing the NO that can cause severe contamination to air in coal-fired boiler in power plant tail gas
x(mainly NO and NO
2) emission, country promulgates that strict standard is limiting NO
xdischarge.In order to control NO in tail gas
xcontent, usually adopt selective catalytic reduction (SCR) and SNCR method (SNCR) to NO
xremove, and no matter adopt any of above two kinds of technology, all can use reductive agent NH
3.NH
3source mainly contain liquid ammonia process for caustic soda purification, Ammonia Process and urea method, because reparation technology is simple, in the past adopted liquid ammonia process for caustic soda purification more, but due to liquefied ammonia danger higher, country progressively requires that cancelling liquid ammonia process for caustic soda purification produces NH
3, and urea method due to security high and be used widely.Urea method is divided into pyrolysismethod and Hydrolyze method, and pyrolysismethod has the fast feature of response power plant load, but need use fuel, and operating cost is higher.Hydrolyze method response speed is slow, but uses steam to make thermal source, mild condition, and operating cost is lower, and the power plant for byproduct steam has obvious advantage in operating cost.But due to urea hydrolyzation and reaction rate low, therefore, when power plant's fast lifting load needs ammonia amount to increase, can not make an immediate response according to the urea increment being calculated gained by certain stoichiometric reaction equation and now actually need advancing the speed of ammonia amount, cause the problem adopting hydrolysis ammonia response speed processed slow.
Summary of the invention
The object of the present invention is to provide hydrolysis of urea ammonia to respond fast and need ammonia amount changeable device and its implementation, mainly solve the problem that in prior art, hydrolysis of urea ammonia response speed is slow.
To achieve these goals, the technical solution used in the present invention is as follows:
Hydrolysis of urea ammonia responds fast needs ammonia amount changeable device, comprise hydrolyzer, urine input pipe, gas ammonia efferent duct, be arranged on the gas ammonia flowrate control valve on gas ammonia efferent duct, be arranged on the urine flow control valve on urine input pipe, the signal analysis display alarm controller of ammonia amount signal is needed for receiving process, first signal converter and secondary signal converter, one end of described urine input pipe is all communicated with described hydrolyzer with one end of described gas ammonia efferent duct, the signal output part of described signal analysis display alarm controller is connected with the signal input part of described first signal converter and the signal input part of described secondary signal converter respectively by signal wire, the signal output part of described first signal converter is connected with described gas ammonia flowrate control valve, the signal output part of described secondary signal converter is connected with described urine flow control valve, said structure is used for according to the actual inlet needing the raw material urine of ammonia amount production control gas ammonia, regulates generation and the outflow of gas ammonia, prevents and blindly produce gas ammonia, the under-supply or gas ammonia production surplus caused.
Further, hydrolysis of urea ammonia responds fast needs ammonia amount changeable device also to comprise steam input pipe road, be arranged on the flow adjusting valve for steam on described steam input pipe road, 3rd signal converter and temperature survey processing mechanism, the signal input part of described 3rd signal converter is connected with the signal output part of described signal analysis display alarm controller and the signal output part of described temperature survey processing mechanism respectively by signal wire, the signal output part of described 3rd signal converter is connected with described steam flow valve, the signal input part of described temperature survey processing mechanism is connected with described hydrolyzer, the one end in described steam input pipe road is communicated with described hydrolyzer, said structure, for controlling the influx of steam, by the exothermic effects of steam, in normal range hydrolyzer temperature being remained on be hydrolyzed ammonia processed, makes the percent hydrolysis of urine be protected.
Particularly, described temperature survey processing mechanism comprises temperature signal processor and the many groups of temperature survey converting units be made up of the 6th signal converter and temperature sensor, the signal output part of described temperature signal processor is the signal output part of described temperature survey processing mechanism, described temperature sensor is the signal input part of described temperature survey processing mechanism, the signal output part of described temperature sensor is connected with the signal input part of described 6th signal converter, the signal output part of described 6th signal converter is connected by the signal input part of signal wire with described temperature signal processor.
Further, element hydrolysis ammonia processed responds fast and needs ammonia amount changeable device also to comprise liquid level gauge, 7th signal converter, liquid level signal processor, discharging of waste liquid pipe, 8th signal converter, be arranged on the waste liquor stream control valve on described discharging of waste liquid pipe, desalted water input pipe, 9th signal converter and the desalted water flowrate control valve be arranged on described desalted water input pipe, described liquid level gauge is connected with described hydrolyzer, the signal output part of described liquid level gauge is connected with the signal input part of described 7th signal converter, the signal output part of described 7th signal converter is connected by the signal input part of signal wire with described liquid level signal processor, the signal output part of described liquid level signal processor is connected with the signal input part of described 8th signal converter and the signal input part of described 9th signal converter respectively by signal wire, the signal output part of described 8th signal converter is connected with described waste liquor stream control valve, described 9th signal converter is connected with described desalted water flowrate control valve, one end of described discharging of waste liquid pipe is all communicated with described hydrolyzer with one end of described desalted water input pipe, said structure reaches monitoring to liquid level in hydrolyzer and adjustment for the flow controlling waste liquid and desalted water, hydrolyzer is remained within the scope of normal liquid level, avoids the impact of too high or too low liquid level on gas ammonia production rate.
Further, hydrolysis of urea ammonia responds fast needs ammonia amount changeable device, also comprise pressure signal processor, 4th signal converter, tail gas efferent duct, be arranged on the exhaust relief valve on described tail gas efferent duct, 5th signal converter and pressure transducer, described pressure transducer is connected with described hydrolyzer, the signal output part of described pressure transducer is connected with the signal input part of described 5th signal converter, the signal output part of described 5th signal converter is connected by the signal input part of signal wire with described pressure signal processor, the output terminal of described pressure signal processor is connected by the signal input part of signal wire with described 4th signal converter, the signal output part of described 4th signal converter is connected with described exhaust relief valve, one end of described tail gas efferent duct is communicated with described hydrolyzer, said structure, for controlling exhaust emissions amount, makes pressure in hydrolyzer remain in normal scope, avoids the impact of too high pressure on hydrolyzer and gas ammonia production rate.
Hydrolysis of urea ammonia responds fast needs the implementation method of ammonia amount changeable device to comprise the following steps:
(A) signal analysis display alarm controller receives and needs ammonia amount signal;
(B) need ammonia amount signal according to what receive, obtain the value of the variable quantity needing ammonia amount;
(C) value of signal analysis display alarm controller to the variable quantity needing ammonia amount judges, when needing the value of the variable quantity of ammonia amount to be less than or equal to the setting of setting, regard as stability state or load reduction situation, carry into execution a plan 1, otherwise regard as load and increase situation fast, then carry into execution a plan 2.
Scheme 1 comprises the following steps:
The gentle ammonia flow control method of charging of hydrolyzer
(C
111) signal analysis display alarm controller is according to the flow needing the value of ammonia amount to calculate required urine charging, and account form calculates (x-need ammonia amount, y-urine feed rate) by formula y=ax;
(C
112) signal analysis display alarm controller is according to needing ammonia amount signal to draw gas ammonia flow and sending gas ammonia flow control signal to the first signal converter, sends urine flow control signal to secondary signal converter;
(C
113) the first signal converter is used for the aperture controlling gas ammonia flowrate control valve after being changed by gas ammonia flow control signal;
(C
114) secondary signal converter is used for the aperture controlling urine flow control valve after being changed by urine flow control signal;
The temperature-controlled process of hydrolyzer
(C
121) temperature of multiple temperature sensor measurement hydrolyzer different parts, and temperature information is sent to temperature signal processor;
(C
122) temperature signal processor calculates temperature averages, judges it whether in the temperature range of setting, is, then not to temperature averages information processing, no, then perform step (C
123) and (C
124);
(C
123) temperature signal processor calculates steam flow controlling value, and sends steam flow control information to the 3rd signal converter;
(C
124) the 3rd signal converter is used for controlling the aperture of flow adjusting valve for steam after steam flow control information being changed;
(C
125) circulation step (C
121) to (C
124) hydrolyzer, is made to remain in the temperature range of setting;
The liquid level controlling method of hydrolyzer
(C
131) liquid level of hydrolyzer measured by liquid level gauge, and sends liquid level information to the 7th signal converter;
(C
132) liquid level signal processor is sent to by signal wire after the 7th signal converter conversion liquid level information;
(C
133) liquid level signal processor judges liquid level whether within the scope of the liquid level of setting, is then do not process liquid level information, no, then, when liquid level exceedes the liquid level scope of setting, perform step (C
134) and (C
135), circulation step (C
134) and (C
135) be positioned at the liquid level scope of setting to liquid level, when liquid level is lower than the liquid level scope set, perform step (C
136) and (C
137), circulation step (C
136) and (C
137) the liquid level scope of setting is positioned to liquid level;
(C
134) liquid level signal processor calculates waste liquid flow control value according to liquid level information, and sends waste liquid flow control information to the 8th signal converter;
(C
135) the 8th signal converter is used for the aperture controlling waste liquor stream control valve after being changed by waste liquid flow control information;
(C
136) liquid level signal processor calculates desalted water flow control value according to liquid level information, and sends desalted water flow control information to the 9th signal converter;
(C
137) the 9th signal converter is used for the aperture controlling desalted water flowrate control valve after being changed by desalted water flow control information;
The compress control method of hydrolyzer
(C
141) pressure in hydrolyzer measured by pressure transducer, and pressure information is sent to the 5th signal converter;
(C
142) pressure signal processor is sent to by signal wire after the 5th signal converter transfer pressure information;
(C
143) pressure signal processor judges pressure whether in the scope of setting, is then do not process liquid level information, no, then perform step (C
144) and (C
145), circulation step (C
144) and (C
145) pressure limit of setting is low to moderate to Pressure Drop;
(C
144) pressure signal processor calculates earth pressure release amount controlling value according to pressure information, and sends the control information of earth pressure release amount to the 4th signal converter;
(C
145) the 4th signal converter is used for controlling the aperture of exhaust relief valve after the control information of earth pressure release amount being changed.
Particularly, step (C
123) in when the scope set lower than normal level, liquid level can not lower than the liquid level being arranged on hydrolyzer internal heat exchange tubes place.
Scheme 2 comprises the following steps:
The charging of hydrolyzer, gas ammonia flow control plan and temperature-controlled process
(C
211) signal analysis display alarm controller calculates the flow of urine charging according to the value of the variable quantity needing ammonia amount, and computing formula is y=y
0+ Δ y
1+ y
1× t(y
0-load increases the urine flow of initial time fast, Δ y
1-urine initial charge flow added value, Δ y
1=a
1x+b
1, y
1-urine the feed rate needing to increase per minute, y
1=a
3x+b
3, x needs ammonia amount rate of change, and t is that load increases the duration, a
1, b
1, a
3, b
3be constant);
(C
212) signal analysis display alarm controller is according to needing ammonia amount signal to draw gas ammonia flow and sending gas ammonia flow control signal to the first signal converter, urine flow control signal is sent to secondary signal converter, calculate steam flow according to needing the value of ammonia amount variable quantity and send steam flow control signal to the 3rd signal converter, the computing formula of steam flow is y '=y
0+ Δ y
2+ y
2× t(y
0-load increases the steam flow of initial time fast, Δ y
2-steam initial time flow added value, Δ y
2=a
2x+b
2, y
2-steam the flow needing to increase per minute, y
2=a
4x+b
4, x needs ammonia amount rate of change, and t is that load increases the duration, a
2, b
2, a
4, b
4be constant);
(C
213) the first signal converter is used for the aperture controlling gas ammonia flowrate control valve after being changed by gas ammonia flow control signal;
(C
214) secondary signal converter is used for the aperture controlling urine flow control valve after being changed by urine flow control signal;
(C
215) the 3rd signal converter is used for controlling the aperture of flow adjusting valve for steam after steam flow control signal being changed;
The liquid level controlling method of hydrolyzer
(C
221) liquid level of hydrolyzer measured by liquid level gauge, and sends liquid level information to the 7th signal converter;
(C
222) liquid level signal processor is sent to by signal wire after the 7th signal converter conversion liquid level information;
(C
223) liquid level signal processor judges liquid level whether within the scope of the liquid level of setting, is then do not process liquid level information, no, then, when liquid level exceedes the liquid level scope of setting, perform step (C
224) and (C
225), circulation step (C
224) and (C
225) be positioned at the liquid level scope of setting to liquid level, when liquid level is lower than the liquid level scope set, perform step (C
226) and (C
227), circulation step (C
226) and (C
227) the liquid level scope of setting is positioned to liquid level;
(C
234) liquid level signal processor calculates waste liquid flow control value according to liquid level information, and sends waste liquid flow control information to the 8th signal converter;
(C
235) the 8th signal converter is used for the aperture controlling waste liquor stream control valve after being changed by waste liquid flow control information;
(C
236) liquid level signal processor calculates desalted water flow control value according to liquid level information, and sends desalted water flow control information to the 9th signal converter;
(C
237) the 9th signal converter is used for the aperture controlling desalted water flowrate control valve after being changed by desalted water flow control information;
The compress control method of hydrolyzer
(C
231) pressure in hydrolyzer measured by pressure transducer, and pressure information is sent to the 5th signal converter;
(C
232) pressure signal processor is sent to by signal wire after the 5th signal converter transfer pressure information;
(C
233) pressure signal processor judges pressure whether in the scope of setting, is then do not process pressure information, no, then perform step (C
234) and (C
235), circulation step (C
234) and (C
235) pressure limit of setting is low to moderate to Pressure Drop;
(C
234) pressure signal processor calculates earth pressure release amount controlling value according to pressure information, and sends the control information of earth pressure release amount to the 4th signal converter;
(C
235) the 4th signal converter is used for controlling the aperture of exhaust relief valve after the control information of earth pressure release amount being changed.
Compared with prior art, the present invention has following beneficial effect:
(1) in the present invention, signal analysis display alarm controller receives and processes and needs ammonia amount signal from power-plant flue gas denitration, the aperture of gas ammonia flowrate control valve is controlled by the first signal converter, and then control the discharge of gas ammonia, the aperture of urine flow control valve is controlled by secondary signal converter, and then the inlet of the raw material urine of production control gas ammonia, reach and need ammonia amount according to actual, regulate generation and the outflow of gas ammonia, prevent and blindly produce gas ammonia, under-supply or the gas ammonia production surplus caused, and when power plant's fast lifting load needs ammonia amount to increase, signal analysis display alarm controller now actually can need advancing the speed of ammonia amount according to needing ammonia amount to make an immediate response, avoid the problem that hydrolysis of urea ammonia response speed is slow.
(2) obtain needing the value of the variable quantity of ammonia amount to judge through signal analysis display alarm controller according to needing ammonia amount signal, when needing the value of the variable quantity of ammonia amount to be less than or equal to the setting of setting, regard as stability state or load reduction situation, control steam flow by the temperature averages of temperature sensor measurement; When needing the value of the variable quantity of ammonia amount to be greater than the setting of setting, regarding as load increases situation fast, by direct calculation of steam flow controlling after needing ammonia amount signal to calculate to need ammonia amount added value; Said structure defines the interlocked control between steam flow and hydrolyzer temperature, by the exothermic effects of steam, in normal range hydrolyzer temperature being remained on be hydrolyzed ammonia processed, the percent hydrolysis of urine is protected, makes work of the present invention more stable.
(3) liquid level of hydrolyzer is measured by liquid level gauge in the present invention, and liquid level signal is sent to liquid level signal processor by the 7th signal converter, when liquid level exceedes normal level setting range, liquid level signal processor makes waste liquor stream control valve open by the 8th signal converter, discharge waste liquid, waste liquor stream control valve is closed when being reduced to normal level to liquid level, when liquid level is lower than normal level setting range, liquid level signal processor makes desalted water flowrate control valve open by the 9th signal converter, in hydrolyzer, input desalted water supplement, desalted water flowrate control valve is closed to when recovering normal level, by to the monitoring of liquid level in hydrolyzer and adjustment, hydrolyzer is made to remain within the scope of normal liquid level, avoid the impact of too high or too low liquid level on gas ammonia production rate, make work of the present invention more stable.
(4) in the present invention, pressure in hydrolyzer measured by pressure transducer, pressure signal processor is transferred to by the 5th signal converter, when pressure exceedes the normally-pressured neighbor be hydrolyzed needed for ammonia processed, pressure signal processor sends signal controls exhaust relief valve aperture by the 4th signal converter, when discharging pressure recover normal range in tail gas to hydrolyzer, close exhaust relief valve, pressure in hydrolyzer is made to remain in normal scope, avoid the impact of too high pressure on hydrolyzer and gas ammonia production rate, make work of the present invention more stable.
(5) the present invention passes through needing the changing value of ammonia amount calculate and judge, to determine load variations situation, different control programs is taked according to different load variations situations, achieve and perform different control programs according to different load situation of change in same hydrolysis of urea ammonia-preparing device, to respond the object needing ammonia amount to change fast.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is the solution technological process of hydrolysis of urea ammoniacal liquor and control chart.
1-signal analysis display alarm controller, 2-first signal converter, 3-gas ammonia efferent duct, 4-gas ammonia flowrate control valve, 5-secondary signal converter, 6-urine input pipe, 7-urine flow control valve, 8-the 3rd signal converter, 9-steam input pipe road, 10-flow adjusting valve for steam, 11-temperature signal processor, 12-pressure signal processor, 13-the 4th signal converter, 14-exhaust relief valve, 15-tail gas efferent duct, 16-the 5th signal converter, 17-pressure transducer, 18-the 6th signal converter, 19-temperature sensor, 20-liquid level gauge, 21-the 7th signal converter, 22-liquid level signal processor, 23-hydrolyzer, 24-discharging of waste liquid pipe, 25-the 8th signal converter, 26-waste liquor stream control valve, 27-desalted water input pipe, 28-the 9th signal converter, 29-desalted water flowrate control valve.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described, and embodiments of the present invention include but not limited to the following example.
Embodiment
As depicted in figs. 1 and 2, hydrolysis of urea ammonia responds fast needs ammonia amount changeable device, comprise hydrolyzer 23, urine input pipe 6, gas ammonia efferent duct 3, be arranged on the gas ammonia flowrate control valve 4 on gas ammonia efferent duct, be arranged on the urine flow control valve 7 on urine input pipe, the signal analysis display alarm controller 1 of ammonia amount signal is needed for receiving process, first signal converter 2 and secondary signal converter 5, one end of urine input pipe 6 is all communicated with hydrolyzer 23 with one end of gas ammonia efferent duct 3, the signal output part of signal analysis display alarm controller 1 is connected with the signal input part of the first signal converter 2 and the signal input part of secondary signal converter 5 respectively by signal wire, the signal output part of the first signal converter 2 is connected with gas ammonia flowrate control valve 4, the signal output part of secondary signal converter 5 is connected with urine flow control valve 7.
Signal analysis display alarm controller receives and processes needs ammonia amount signal from power-plant flue gas denitration, the aperture of gas ammonia flowrate control valve is controlled by the first signal converter, and then control the discharge of gas ammonia, the aperture of urine flow control valve is controlled by secondary signal converter, and then the inlet of the raw material urine of production control gas ammonia, reach according to the actual generation and the outflow that need ammonia amount adjustment gas ammonia, prevent and blindly produce gas ammonia, cause the under-supply of gas ammonia or production surplus.
Hydrolysis of urea ammonia responds fast needs ammonia amount changeable device also to comprise steam input pipe road 9, be arranged on the flow adjusting valve for steam 10 on steam input pipe road 9, 3rd signal converter 8, temperature signal processor 11 and the many groups of temperature survey converting units be made up of the 6th signal converter 18 and temperature sensor 19, the one end in steam input pipe road 9 is communicated with hydrolyzer 23, the signal input part of the 3rd signal converter 8 is connected with the signal output part of signal analysis display alarm controller 1 and the signal output part of temperature signal processor 11 respectively by signal wire, the signal output part of the 3rd signal converter 8 is connected with steam flow valve 10, temperature sensor 19 is connected with hydrolyzer 23, the signal output part of temperature sensor 19 is connected with the signal input part of the 6th signal converter 18, the signal output part of the 6th signal converter 18 is connected by the signal input part of signal wire with temperature signal processor 11.
Signal analysis display alarm controller is according to the value needing ammonia amount signal to obtain needing the variable quantity of ammonia amount, and judge, when needing the value of the variable quantity of ammonia amount to be less than or equal to the setting of setting, regard as stability state or load reduction situation, control steam flow by the temperature averages of temperature sensor measurement; When needing the value of the variable quantity of ammonia amount to be greater than the setting of setting, regarding as load increases situation fast, be by after needing ammonia amount signal to calculate to need ammonia amount added value directly calculation of steam flow and control; Said structure defines the interlocked control between steam flow and hydrolyzer temperature, by the exothermic effects of steam, in normal range hydrolyzer temperature being remained on be hydrolyzed ammonia processed, the percent hydrolysis of urine is protected, steam condensate is formed after steam heat release, and by recycling after the discharge of steam condensate efferent duct.
Hydrolysis of urea ammonia responds fast needs ammonia amount changeable device also to comprise liquid level gauge 20, 7th signal converter 21, liquid level signal processor 22, discharging of waste liquid pipe 24, 8th signal converter 25, be arranged on the waste liquor stream control valve 26 on discharging of waste liquid pipe 24, desalted water input pipe 27, 9th signal converter 28 and the desalted water flowrate control valve 29 be arranged on desalted water input pipe 27, liquid level gauge 20 is connected with hydrolyzer 23, the signal output part of liquid level gauge 20 is connected with the signal input part of the 7th signal converter 21, the signal output part of the 7th signal converter 21 is connected by the signal input part of signal wire with liquid level signal processor 22, the signal output part of liquid level signal processor 22 is connected with the signal input part of the 8th signal converter 25 and the signal input part of the 9th signal converter 28 respectively by signal wire, the signal output part of the 8th signal converter 25 is connected with waste liquor stream control valve 26, 9th signal converter 28 is connected with desalted water flowrate control valve 29, one end of discharging of waste liquid pipe 24 is all communicated with hydrolyzer 23 with one end of desalted water input pipe 27.
The liquid level of hydrolyzer is measured by liquid level gauge, and liquid level signal is sent to liquid level signal processor by the 7th signal converter, when liquid level exceedes normal level setting range, liquid level signal processor makes waste liquor stream control valve open by the 8th signal converter, discharge waste liquid, waste liquor stream control valve is closed when being reduced to normal level to liquid level, when liquid level is lower than normal level setting range, liquid level signal processor makes desalted water flowrate control valve open by the 9th signal converter, in hydrolyzer, input desalted water supplement, desalted water flowrate control valve is closed to when recovering normal level, by to the monitoring of liquid level in hydrolyzer and adjustment, hydrolyzer is made to remain within the scope of normal liquid level, avoid the impact of too high or too low liquid level on gas ammonia production rate.
Hydrolysis of urea ammonia responds fast needs ammonia amount changeable device also to comprise pressure signal processor 12, 4th signal converter 13, tail gas efferent duct 15, be arranged on the exhaust relief valve 14 on tail gas efferent duct 15, 5th signal converter 16 and pressure transducer 17, pressure transducer 17 is connected with hydrolyzer 23, the signal output part of pressure transducer 17 is connected with the signal input part of the 5th signal converter 16, the signal output part of the 5th signal converter 16 is connected by the signal input part of signal wire with pressure signal processor 12, the output terminal of pressure signal processor 12 is connected by the signal input part of signal wire with the 4th signal converter 13, the signal output part of the 4th signal converter 13 is connected with exhaust relief valve 14, one end of tail gas efferent duct 15 is communicated with hydrolyzer 23.
Pressure in hydrolyzer measured by pressure transducer, and be transferred to pressure signal processor by the 5th signal converter, when pressure exceedes the normally-pressured neighbor be hydrolyzed needed for ammonia processed, pressure signal processor sends signal controls exhaust relief valve aperture by the 4th signal converter, when in discharge tail gas to hydrolyzer, pressure recover is to normal range, close exhaust relief valve, said structure defines the interlocked control between pressure transducer and exhaust relief valve, pressure in hydrolyzer is made to keep in normal scope, avoid the impact of too high pressure on hydrolyzer and gas ammonia production rate.
Signal analysis display alarm controller receives needs ammonia amount signal to obtain needing the value of the variable quantity of ammonia amount, and be that stability state or load reduce situation when this value is less than or equal to the setting of setting, implementation method of the present invention is:
Signal analysis display alarm controller is according to the flow needing the value of ammonia amount to calculate required urine charging, and account form calculates (x-need ammonia amount, y-urine feed rate) by formula y=ax; Signal analysis display alarm controller, according to needing ammonia amount signal to draw gas ammonia flow and sending gas ammonia flow control signal to the first signal converter, sends urine flow control signal to secondary signal converter; First signal converter is used for the aperture controlling gas ammonia flowrate control valve after being changed by gas ammonia flow control signal; Secondary signal converter is used for the aperture controlling urine flow control valve after being changed by urine flow control signal; Such scheme is the gentle ammonia flow control program of charging of the present invention.
The temperature of multiple temperature sensor measurement hydrolyzer different parts, and temperature information is sent to temperature signal processor; Temperature signal processor calculates temperature averages, judges it whether in the temperature range of setting, is, then not to temperature averages information processing, no, then temperature signal processor calculates steam flow controlling value, and sends steam flow control information to the 3rd signal converter; 3rd signal converter is used for controlling the aperture of flow adjusting valve for steam after steam flow control information being changed, make hydrolyzer remain in the temperature range of setting; Such scheme is temperature control scheme of the present invention.
The liquid level of hydrolyzer measured by liquid level gauge, and sends liquid level information to the 7th signal converter; Liquid level signal processor is sent to by signal wire after 7th signal converter conversion liquid level information; Liquid level signal processor judges liquid level whether within the scope of the liquid level of setting, be, then liquid level information is not processed, no, then when liquid level exceedes the liquid level scope of setting, liquid level signal processor calculates waste liquid flow control value according to liquid level information, and sends waste liquid flow control information to the 8th signal converter; 8th signal converter is used for the aperture controlling waste liquor stream control valve after being changed by waste liquid flow control information, makes liquid level be positioned at the liquid level scope of setting; When liquid level lower than setting liquid level scope time (lower than normal level setting scope time, liquid level can not lower than the liquid level being arranged on hydrolyzer internal heat exchange tubes place), liquid level signal processor calculates desalted water flow control value according to liquid level information, and sends desalted water flow control information to the 9th signal converter; 9th signal converter is used for the aperture controlling desalted water flowrate control valve after being changed by desalted water flow information, makes liquid level be positioned at the liquid level scope of setting; Such scheme is the Liquid level scheme of hydrolyzer of the present invention.
Pressure in hydrolyzer measured by pressure transducer, and pressure information is sent to the 5th signal converter; Pressure signal processor is sent to by signal wire after 5th signal converter transfer pressure information; Pressure signal processor judges pressure whether in the scope of setting, then liquid level information is not processed, no, then pressure signal processor calculates earth pressure release amount controlling value according to pressure information, and sends the control information of earth pressure release amount to the 4th signal converter; 4th signal converter is used for controlling the aperture of exhaust relief valve after the control information of earth pressure release amount being changed, make Pressure Drop be low to moderate the pressure limit of setting; Such scheme is the pressure control strategy of hydrolyzer of the present invention.
Signal analysis display alarm controller receives needs ammonia amount signal to obtain needing the value of the variable quantity of ammonia amount, and be that load increases situation fast when this value is greater than the setting of setting, implementation method of the present invention is:
Signal analysis display alarm controller calculates the flow of urine charging according to the value of the variable quantity needing ammonia amount, computing formula is y=y
0+ Δ y
1+ y
1× t(y
0-load increases the urine flow of initial time fast, Δ y
1-urine initial charge flow added value, Δ y
1=a
1x+b
1, y
1-urine the feed rate needing to increase per minute, y
1=a
3x+b
3, x needs ammonia amount rate of change, and t is that load increases the duration, a
1, b
1, a
3, b
3be constant); Signal analysis display alarm controller is according to needing ammonia amount signal to draw gas ammonia flow and sending gas ammonia flow control signal to the first signal converter, urine flow control signal is sent to secondary signal converter, calculate steam flow according to the value of the variable quantity needing ammonia amount and send steam flow control signal to the 3rd signal converter, the computing formula of steam flow is y '=y
0+ Δ y
2+ y
2× t(y
0-load increases the steam flow of initial time fast, Δ y
2-steam initial time flow added value, Δ y
2=a
2x+b
2, y
2-steam the flow needing to increase per minute, y
2=a
4x+b
4, x needs ammonia amount rate of change, and t is that load increases the duration, a
2, b
2, a
4, b
4be constant); First signal converter is used for the aperture controlling gas ammonia flowrate control valve after being changed by gas ammonia flow control signal; Secondary signal converter is used for the aperture controlling urine flow control valve after being changed by urine flow control signal; 3rd signal converter is used for controlling the aperture of flow adjusting valve for steam after steam flow control signal being changed; Such scheme is charging of the present invention, gas ammonia flow control plan and temperature control scheme.
It is identical that pressure control strategy and Liquid level scheme and stability state or the load of hydrolyzer reduce situation.
Reduce pressure control strategy, temperature control scheme, charging control program, the gentle ammonia flow control program of Liquid level scheme in situation and load increase situation fast at scheme stability state or load to perform all simultaneously.
In the present invention, the model of signal analysis display alarm controller is JX-300XP, and signal analysis display alarm controller has the signal processing function of temperature signal processor, liquid level signal processor, pressure signal processor simultaneously; The model of temperature signal converter is JWB-P240F03; The model of liquid level signal converter is UYZ-34; The model of pressure signal converter is TK430A.
According to above-described embodiment, just the present invention can be realized well.What deserves to be explained is; under prerequisite based on said structure design, for solving same technical matters, even if some making on the invention are without substantial change or polishing; the essence of the technical scheme adopted is still the same with the present invention, therefore it also should in protection scope of the present invention.
Claims (9)
1. hydrolysis of urea ammonia responds fast needs ammonia amount changeable device, comprise hydrolyzer (23), urine input pipe (6), gas ammonia efferent duct (3), be arranged on the gas ammonia flowrate control valve (4) on gas ammonia efferent duct and be arranged on urine input pipe urine flow control valve (7), one end of described urine input pipe (6) is all communicated with described hydrolyzer (23) with one end of described gas ammonia efferent duct (3), it is characterized in that, also comprise the signal analysis display alarm controller (1) needing ammonia amount signal for receiving process, first signal converter (2) and secondary signal converter (5), the signal output part of described signal analysis display alarm controller (1) is connected with the signal input part of described first signal converter (2) and the signal input part of described secondary signal converter (5) respectively by signal wire, the signal output part of described first signal converter (2) is connected with described gas ammonia flowrate control valve (4), the signal output part of described secondary signal converter (5) is connected with described urine flow control valve (7).
2. hydrolysis of urea ammonia according to claim 1 responds fast and needs ammonia amount changeable device, it is characterized in that, also comprise steam input pipe road (9), be arranged on the flow adjusting valve for steam (10) on described steam input pipe road (9), 3rd signal converter (8) and temperature survey processing mechanism, the signal input part of described 3rd signal converter (8) is connected with the signal output part of described signal analysis display alarm controller (1) and the signal output part of described temperature survey processing mechanism respectively by signal wire, the signal output part of described 3rd signal converter (8) is connected with described steam flow valve (10), the signal input part of described temperature survey processing mechanism is connected with described hydrolyzer (23), one end of described steam input pipe road (9) is communicated with described hydrolyzer (23).
3. hydrolysis of urea ammonia according to claim 2 responds fast and needs ammonia amount changeable device, it is characterized in that, described temperature survey processing mechanism comprises temperature signal processor (11) and the many groups of temperature survey converting units be made up of the 6th signal converter (18) and temperature sensor (19), the signal output part of described temperature signal processor (11) is the signal output part of described temperature survey processing mechanism, described temperature sensor (19) is the signal input part of described temperature survey processing mechanism, the signal output part of described temperature sensor (19) is connected with the signal input part of described 6th signal converter (18), the signal output part of described 6th signal converter (18) is connected by the signal input part of signal wire with described temperature signal processor (11).
4. hydrolysis of urea ammonia according to claim 1 responds fast and needs ammonia amount changeable device, it is characterized in that, also comprise liquid level gauge (20), 7th signal converter (21), liquid level signal processor (22), discharging of waste liquid pipe (24), 8th signal converter (25), be arranged on the waste liquor stream control valve (26) on described discharging of waste liquid pipe (24), desalted water input pipe (27), 9th signal converter (28) and the desalted water flowrate control valve (29) be arranged on described desalted water input pipe (27), described liquid level gauge (20) is connected with described hydrolyzer (23), the signal output part of described liquid level gauge (20) is connected with the signal input part of described 7th signal converter (21), the signal output part of described 7th signal converter (21) is connected by the signal input part of signal wire with described liquid level signal processor (22), the signal output part of described liquid level signal processor (22) is connected with the signal input part of described 8th signal converter (25) and the signal input part of described 9th signal converter (28) respectively by signal wire, the signal output part of described 8th signal converter (25) is connected with described waste liquor stream control valve (26), described 9th signal converter (28) is connected with described desalted water flowrate control valve (29), one end of described discharging of waste liquid pipe (24) is all communicated with described hydrolyzer (23) with one end of described desalted water input pipe (27).
5. hydrolysis of urea ammonia according to claim 1 responds fast and needs ammonia amount changeable device, it is characterized in that, also comprise pressure signal processor (12), 4th signal converter (13), tail gas efferent duct (15), be arranged on the exhaust relief valve (14) on described tail gas efferent duct (15), 5th signal converter (16) and pressure transducer (17), described pressure transducer (17) is connected with described hydrolyzer (23), the signal output part of described pressure transducer (17) is connected with the signal input part of described 5th signal converter (16), the signal output part of described 5th signal converter (16) is connected by the signal input part of signal wire with described pressure signal processor (12), the output terminal of described pressure signal processor (12) is connected by the signal input part of signal wire with described 4th signal converter (13), the signal output part of described 4th signal converter (13) is connected with described exhaust relief valve (14), one end of described tail gas efferent duct (15) is communicated with described hydrolyzer (23).
6. respond based on the hydrolysis of urea ammonia described in claim 1 to 5 Arbitrary Term the implementation method needing ammonia amount changeable device fast, it is characterized in that, comprise the following steps:
(A) signal analysis display alarm controller receives and needs ammonia amount signal;
(B) need ammonia amount signal according to what receive, obtain the value of the variable quantity needing ammonia amount;
(C) value of signal analysis display alarm controller to the variable quantity needing ammonia amount judges, when needing the value of the variable quantity of ammonia amount to be less than or equal to the setting of setting, regard as stability state or load reduction situation, carry into execution a plan 1, otherwise regard as load and increase situation fast, then carry into execution a plan 2.
7. hydrolysis of urea ammonia according to claim 6 responds the implementation method needing ammonia amount changeable device fast, it is characterized in that, scheme 1 comprises the following steps:
The gentle ammonia flow control method of charging of hydrolyzer
(C
111) signal analysis display alarm controller is according to the flow needing the value of ammonia amount to calculate required urine charging, and account form calculates (x-need ammonia amount, y-urine feed rate) by formula y=ax;
(C
112) signal analysis display alarm controller is according to needing ammonia amount signal to draw gas ammonia flow and sending gas ammonia flow control signal to the first signal converter, sends urine flow control signal to secondary signal converter;
(C
113) the first signal converter is used for the aperture controlling gas ammonia flowrate control valve after being changed by gas ammonia flow control signal;
(C
114) secondary signal converter is used for the aperture controlling urine flow control valve after being changed by urine flow control signal;
The temperature-controlled process of hydrolyzer
(C
121) temperature of multiple temperature sensor measurement hydrolyzer different parts, and temperature information is sent to temperature signal processor;
(C
122) temperature signal processor calculates temperature averages, judges it whether in the temperature range of setting, is, then not to temperature averages information processing, no, then perform step (C
123) and (C
124);
(C
123) temperature signal processor calculates steam flow controlling value, and sends steam flow control information to the 3rd signal converter;
(C
124) the 3rd signal converter is used for controlling the aperture of flow adjusting valve for steam after steam flow control information being changed;
(C
125) circulation step (C
121) to (C
124) hydrolyzer, is made to remain in the temperature range of setting;
The liquid level controlling method of hydrolyzer
(C
131) liquid level of hydrolyzer measured by liquid level gauge, and sends liquid level information to the 7th signal converter;
(C
132) liquid level signal processor is sent to by signal wire after the 7th signal converter conversion liquid level information;
(C
133) liquid level signal processor judges liquid level whether within the scope of the liquid level of setting, is then do not process liquid level information, no, then, when liquid level exceedes the liquid level scope of setting, perform step (C
134) and (C
135), circulation step (C
134) and (C
135) be positioned at the liquid level scope of setting to liquid level, when liquid level is lower than the liquid level scope set, perform step (C
136) and (C
137), circulation step (C
136) and (C
137) the liquid level scope of setting is positioned to liquid level;
(C
134) liquid level signal processor calculates waste liquid flow control value according to liquid level information, and sends waste liquid flow control information to the 8th signal converter;
(C
135) the 8th signal converter is used for the aperture controlling waste liquor stream control valve after being changed by waste liquid flow control information;
(C
136) liquid level signal processor calculates desalted water flow control value according to liquid level information, and sends desalted water flow control information to the 9th signal converter;
(C
137) the 9th signal converter is used for the aperture controlling desalted water flowrate control valve after being changed by desalted water flow control information;
The compress control method of hydrolyzer
(C
141) pressure in hydrolyzer measured by pressure transducer, and pressure information is sent to the 5th signal converter;
(C
142) pressure signal processor is sent to by signal wire after the 5th signal converter transfer pressure information;
(C
143) pressure signal processor judges pressure whether in the scope of setting, is then do not process liquid level information, no, then perform step (C
144) and (C
145), circulation step (C
144) and (C
145) pressure limit of setting is low to moderate to Pressure Drop;
(C
144) pressure signal processor calculates earth pressure release amount controlling value according to pressure information, and sends the control information of earth pressure release amount to the 4th signal converter;
(C
145) the 4th signal converter is used for controlling the aperture of exhaust relief valve after the control information of earth pressure release amount being changed.
8. hydrolysis of urea ammonia according to claim 7 responds the implementation method needing ammonia amount changeable device fast, it is characterized in that, step (C
123) in when the scope set lower than normal level, liquid level can not lower than the liquid level being arranged on hydrolyzer internal heat exchange tubes place.
9. hydrolysis of urea ammonia according to claim 6 responds the implementation method needing ammonia amount changeable device fast, it is characterized in that, scheme 2 comprises the following steps:
The charging of hydrolyzer, gas ammonia flow control plan and temperature-controlled process
(C
211) signal analysis display alarm controller calculates the flow of urine charging according to the value of the variable quantity needing ammonia amount, and computing formula is y=y
0+ Δ y
1+ y
1× t(y
0-load increases the urine flow of initial time fast, Δ y
1-urine initial charge flow added value, Δ y
1=a
1x+b
1, y
1-urine the feed rate needing to increase per minute, y
1=a
3x+b
3, x needs ammonia amount rate of change, and t is that load increases the duration, a
1, b
1, a
3, b
3be constant);
(C
212) signal analysis display alarm controller is according to needing ammonia amount signal to draw gas ammonia flow and sending gas ammonia flow control signal to the first signal converter, urine flow control signal is sent to secondary signal converter, calculate steam flow according to the value of the variable quantity needing ammonia amount and send steam flow control signal to the 3rd signal converter, the computing formula of steam flow is y '=y
0+ Δ y
2+ y
2× t(y
0-load increases the steam flow of initial time fast, Δ y
2-steam initial time flow added value, Δ y
2=a
2x+b
2, y
2-steam the flow needing to increase per minute, y
2=a
4x+b
4, x needs ammonia amount rate of change, and t is that load increases the duration, a
2, b
2, a
4, b
4be constant);
(C
213) the first signal converter is used for the aperture controlling gas ammonia flowrate control valve after being changed by gas ammonia flow control signal;
(C
214) secondary signal converter is used for the aperture controlling urine flow control valve after being changed by urine flow control signal;
(C
215) the 3rd signal converter is used for controlling the aperture of flow adjusting valve for steam after steam flow control signal being changed;
The liquid level controlling method of hydrolyzer
(C
221) liquid level of hydrolyzer measured by liquid level gauge, and sends liquid level information to the 7th signal converter;
(C
222) liquid level signal processor is sent to by signal wire after the 7th signal converter conversion liquid level information;
(C
223) liquid level signal processor judges liquid level whether within the scope of the liquid level of setting, is then do not process liquid level information, no, then, when liquid level exceedes the liquid level scope of setting, perform step (C
224) and (C
225), circulation step (C
224) and (C
225) be positioned at the liquid level scope of setting to liquid level, when liquid level is lower than the liquid level scope set, perform step (C
226) and (C
227), circulation step (C
226) and (C
227) the liquid level scope of setting is positioned to liquid level;
(C
234) liquid level signal processor calculates waste liquid flow control value according to liquid level information, and sends waste liquid flow control information to the 8th signal converter;
(C
235) the 8th signal converter is used for the aperture controlling waste liquor stream control valve after being changed by waste liquid flow control information;
(C
236) liquid level signal processor calculates desalted water flow control value according to liquid level information, and sends desalted water flow control information to the 9th signal converter;
(C
237) the 9th signal converter is used for the aperture controlling desalted water flowrate control valve after being changed by desalted water flow control information;
The compress control method of hydrolyzer
(C
231) pressure in hydrolyzer measured by pressure transducer, and pressure information is sent to the 5th signal converter;
(C
232) pressure signal processor is sent to by signal wire after the 5th signal converter transfer pressure information;
(C
233) pressure signal processor judges pressure whether in the scope of setting, is then do not process pressure information, no, then perform step (C
234) and (C
235), circulation step (C
234) and (C
235) pressure limit of setting is low to moderate to Pressure Drop;
(C
234) pressure signal processor calculates earth pressure release amount controlling value according to pressure information, and sends the control information of earth pressure release amount to the 4th signal converter;
(C
235) the 4th signal converter is used for controlling the aperture of exhaust relief valve after the control information of earth pressure release amount being changed.
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| CN105314653A (en) * | 2015-11-11 | 2016-02-10 | 中国华能集团公司 | Control system and control method for urea hydrolysis reactor |
| CN109139201A (en) * | 2018-09-06 | 2019-01-04 | 珠海金茂科技有限公司 | A kind of method for heating and controlling and device for preventing solution from crystallizing |
| CN110389601A (en) * | 2018-09-07 | 2019-10-29 | 沈阳化工股份有限公司 | A kind of control method, device and the equipment of stable liquid level |
| CN111495293A (en) * | 2020-04-22 | 2020-08-07 | 杭州和利时自动化有限公司 | Automatic switching control method of hydrolysis reactor for ammonia production system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111495293A (en) * | 2020-04-22 | 2020-08-07 | 杭州和利时自动化有限公司 | Automatic switching control method of hydrolysis reactor for ammonia production system |
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| CN104556146B (en) | 2016-08-24 |
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