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公开(公告)号：US4861233A
公开(公告)日：1989-08-29
申请号：US192807
申请日：1988-05-11
CPC分类号： F04D27/0207
摘要： A surge control system (16) is provided for a compressor (14) which anticipates the actual surge condition and initiates anti-surge protection in proportion to the magnitude of the anticipated surge condition. This is done by providing a feed foward signal (20) to a summing station (48) along with a normally generated surge control line point (44) to offset this point (44) by an amount determined by the feed forward signal (20). This offset point (50) is used as an input to a controller for controlling the bypass valve (28) in a bypass loop (30) around the compressor (14).
摘要翻译： 提供一种用于压缩机（14）的浪涌控制系统（16），该压缩机预测实际的浪涌状况，并且与预期的喘振状况的大小成比例地启动防浪涌保护。 这通过将馈送信号（20）连同正常产生的喘振控制线路点（44）一起提供给求和站（44），以将该点（44）偏移由前馈信号（20）确定的量， 。 该偏移点（50）用作控制器的输入，用于控制围绕压缩机（14）的旁通回路（30）中的旁通阀（28）。
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公开(公告)号：US4776301A
公开(公告)日：1988-10-11
申请号：US25047
申请日：1987-03-12
CPC分类号： F22G5/12
摘要： A control system for a heat exchanger, such as a superheater in a fossil fuel fired steam generator, uses a multivariable non-linear regression equation to develop a feed forward signal that continuously adapts itself to changes in system variables to adjust the enthalpy of the steam entering the superheater and maintain a substantially constant enthalpy of the steam discharged from the superheater. The system develops a feedback signal responsive to changes in the temperature of the steam discharged from the superheater to readjust the enthalpy of the steam entering the superheater as required to maintain the steam leaving the superheater at a predetermined set point temperature.
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公开(公告)号：US4742284A
公开(公告)日：1988-05-03
申请号：US940137
申请日：1986-12-09
CPC分类号： G05B19/23 , G05B2219/41038 , G05B2219/41244
摘要： A controller for close positioning or modulating control of an electric motor is disclosed. The controller compares a signal representative of the demand on the system with a signal representative of the actual position of the motor or a valve associated therewith, and if the difference between the signals exceeds a "deadband" and no action has been taken within a first time interval, and if the last movement of the valve was in the same direction and a second time interval has elapsed, a motor run pulse is generated. If the last movement of the valve was in a direction opposite to that desired, the motor run pulse is extended to overcome "backlash" resulting from the reversal of motor rotation.
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公开(公告)号：US4900232A
公开(公告)日：1990-02-13
申请号：US324492
申请日：1989-03-16
IPC分类号： F04D27/02
CPC分类号： F04D27/0207 , F04D27/0284
摘要： A surge control system (16) is provided for a compressor (14) which anticipates the actual surge condition and initiates anti-surge protection in proportion to the magnitude of the anticipated surge condition. This is done by providing a feed forward signal (20) to a summing station (48) along with a normally generated surge control line point (44) to offset this point (44) by an amount determined by the feed forward signal (20). This offset point (50) is used as an input to a controller for controlling the bypass valve (28) in a bypass loop (30) around the compressor (14).
摘要翻译： 提供一种用于压缩机（14）的浪涌控制系统（16），该压缩机预测实际的浪涌状况，并且与预期的喘振状况的大小成比例地启动防浪涌保护。 这通过向求和站（48）提供前馈信号（20）以及正常产生的喘振控制线路点（44），以将该点（44）偏移由前馈信号（20）确定的量， 。 该偏移点（50）用作控制器的输入，用于控制围绕压缩机（14）的旁通回路（30）中的旁通阀（28）。
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公开(公告)号：US4593477A
公开(公告)日：1986-06-10
申请号：US691339
申请日：1985-01-14
CPC分类号： B01J8/1809 , G01F23/18 , B01J2208/0061
摘要： A system for controlling the bed level of a fluidized bed independent of the density of the bed material using a minimum number of pressure sensors is disclosed. A pressure sensor is positioned at the base of the bed, at approximately eight feet above the distributor plate, and at one or more intermediate locations therebetween. The measurements from the foregoing sensors are selectively processed through the use of a specific logic arrangement to produce an output signal representative of the bed level of the fluidized bed.
摘要翻译： 公开了一种使用最小数量的压力传感器来控制流化床的床层的系统，其独立于床材料的密度。 压力传感器位于床的底部，位于分布板上方大约八英尺处，并且位于它们之间的一个或多个中间位置处。 通过使用特定的逻辑布置来选择性地处理来自上述传感器的测量值，以产生表示流化床床层的输出信号。
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公开(公告)号：US4454840A
公开(公告)日：1984-06-19
申请号：US502906
申请日：1983-07-14
CPC分类号： F22B37/56
摘要： A method of identifying a parameter of a model for a rate of loss of boiler efficiency due to a sootblowing operation, in a boiler or other convection heat transfer device having a plurality of heat traps, comprises measuring a time since a last sootblowing operation in the heat trap in question, measuring an overall boiler efficiency at the beginning of sootblowing for the heat trap in question, measuring a change in efficiency due to the sootblowing operation and calculating the parameter using an equation. According to the equation, the ratio of efficiency change over overall boiler efficiency equals the time factor since the last sootblowing operation times the parameter minus a summation of factors for each of the other heat traps and their associated sootblowing operations. A method is also disclosed for enhancing a sootblowing operation wherein, with a plurality of heat traps, sootblowing is performed in an upstream heat trap in preference to a downstream heat trap, when both heat traps are near a fouled condition which would require sootblowing. This prevents premature fouling of a downstream heat trap which has recently been cleaned by soot blown off an upstream heat trap.
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公开(公告)号：US4435650A
公开(公告)日：1984-03-06
申请号：US331060
申请日：1981-12-15
申请人： Donald J. Dziubakowski , Azmi Kaya , Marion A. Keyes , Theodore N. Matsko , William H. Moss , Thomas J. Scheib
发明人： Donald J. Dziubakowski , Azmi Kaya , Marion A. Keyes , Theodore N. Matsko , William H. Moss , Thomas J. Scheib
CPC分类号： F22B35/008 , F01K13/02 , Y10T307/414 , Y10T307/576
摘要： A load control for a system comprised of a plurality of energy converters wherein a System Control Signal proportional to system load is developed and utilized to simultaneously adjust the rate of energy conversion of each of the converters in parallel in accordance with changes in system load. The rate of energy conversion for each converter, while operating under stead-state conditions for a predetermined period of time, is readjusted until its actual incremental cost of production is equal to a desired incremental cost.
摘要翻译： 用于由多个能量转换器组成的系统的负载控制器，其中开发并利用与系统负载成比例的系统控制信号，以根据系统负载的变化同时调整每个转换器的能量转换速率。 重新调整每个转换器的能量转换速率，同时在替代状态下操作预定时间段，直到其实际的增加生产成本等于期望的增量成本为止。
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