-
1.发明授权Control system and method for a steam turbine having a steam bypass arrangement 失效具有蒸汽旁路装置的蒸汽轮机的控制系统和方法
公开(公告)号：US4471446A
公开(公告)日：1984-09-11
申请号：US397260
申请日：1982-07-12
摘要： A DEH (digital electrohydraulic) control system for a steam turbine generator having a steam bypass system. The turbine system includes a high pressure turbine having throttle and governor steam admission valves as well as an intermediate pressure turbine having stop and interceptor steam admission valves. The turbine is brought on line by initially controlling steam admission into the intermediate pressure turbine by modulating the interceptor valve in response to a speed error signal generated as a result of the difference between actual and a predetermined reference speed. During this initial control the throttle valve remains in a closed position. When the turbine speed has attained a preset value such as half of synchronous speed, the interceptor valve is held at the same position it was in when the preset speed was attained and the throttle valve is controllably open in response to the same speed error signal. After a preset transfer speed has been attained, control of steam admission to the high pressure turbine is transferred to the governor valve and after synchronous speed has been reached the DEH system switches to a load control mode wherein the signal which controls the positioning of the governor valve is also utilized to control the interceptor valve position. The interceptor valve thereafter will reach a wide open position at a predetermined load.During the speed control mode of operation the control signal which controls the positioning of the interceptor valve is modified by certain pressure conditions at the input of the interceptor valve after the preset speed is attained.
摘要翻译： 一种用于具有蒸汽旁通系统的蒸汽轮机发电机的DEH（数字电动液压）控制系统。 涡轮机系统包括具有节流阀和调速器蒸气入口阀的高压涡轮机以及具有停止和拦截器蒸汽进入阀的中间压力涡轮机。 通过根据由实际和预定参考速度之间的差异产生的速度误差信号调制拦截阀，通过初始地控制蒸汽进入中压涡轮机，使涡轮机上线。 在该初始控制期间，节流阀保持在关闭位置。 当涡轮机转速达到同步速度的一半的预设值时，拦截阀保持在达到预设速度的同一位置，并且节流阀响应于相同的速度误差信号而可控地打开。 在达到预设的传送速度之后，控制进入高压涡轮机的蒸汽进入调速阀，并且在达到同步速度之后，DEH系统切换到负载控制模式，其中控制调速器定位的信号 阀门也用于控制拦截阀的位置。 此后的拦截器阀将以预定的负载达到大的打开位置。 在速度控制运行模式下，控制拦截阀定位的控制信号在达到预设速度后，通过拦截阀输入端的某些压力条件进行修改。
-
公开(公告)号：US4455836A
公开(公告)日：1984-06-26
申请号：US305814
申请日：1981-09-25
CPC分类号： F01K7/24 , F01D17/105 , F01K7/165
摘要： A bypass system for a steam turbine wherein the temperature of the steam bypassed around the high pressure turbine is accurately controlled by measuring the inlet and outlet temperatures of the boiler reheater and generating an adaptive set point. The set point value is used to govern operation of a spray valve which admits cooling water to the bypass steam path.
摘要翻译： 一种用于蒸汽涡轮机的旁路系统，其中通过测量锅炉再热器的入口和出口温度并产生自适应设定点来精确地控制绕高压涡轮机旁路的蒸汽的温度。 设定值用于控制允许冷却水到旁路蒸汽路径的喷雾阀的操作。
-
公开(公告)号：US4448026A
公开(公告)日：1984-05-15
申请号：US305813
申请日：1981-09-25
CPC分类号： F01K7/24 , F01D17/105 , F01K7/16
摘要： A steam turbine system which includes a steam generator and a steam bypass path for bypassing steam around the turbine. The outlet throttle pressure of the steam generator is controlled by controlling admission of steam into the bypass path by means of a bypass valve. A desired throttle pressure set point is generated which is independent of steam flow and this set point is compared with the actual throttle pressure for governing the bypass valve during turbine start-up. When the turbine is fully operational the bypass valve control is effected by a comparison of the actual throttle pressure with the desired throttle pressure set point plus some bias.
摘要翻译： 一种蒸汽轮机系统，其包括蒸汽发生器和用于绕过涡轮机绕过蒸汽的蒸汽旁路路径。 通过控制通过旁通阀将蒸汽引入旁通路径来控制蒸汽发生器的出口节流压力。 产生与蒸汽流无关的所需的节流压力设定点，并将该设定点与在涡轮启动期间控制旁通阀的实际节气门压力进行比较。 当涡轮机完全可操作时，通过将实际节气门压力与期望的节气门压力设定值加上一些偏差进行比较来实现旁通阀控制。
-
公开(公告)号：US4471620A
公开(公告)日：1984-09-18
申请号：US321160
申请日：1981-11-13
摘要： A bypass system for a steam turbine wherein the energy level of the steam bypassed around the intermediate pressure and low pressure turbines is modified by introduction of cooling water. The amount of water introduced is adaptively varied as a function of the enthalpy of the bypassed steam as measured by a sensor in the steam path.
摘要翻译： 一种用于蒸汽轮机的旁路系统，其中通过引入冷却水来改变围绕中压和低压涡轮机旁路的蒸汽的能级。 随着蒸汽路径中的传感器测量，引入的水量随着旁路蒸汽的焓的变化而自适应地变化。
-
5.发明授权
公开(公告)号：US4306417A
公开(公告)日：1981-12-22
申请号：US98106
申请日：1979-11-28
CPC分类号： F22B35/008 , F01K13/02
摘要： A steam blending control is provided for two or more boilers in an electric power plant. To blend an oncoming boiler with an on-line boiler, the oncoming boiler is fired to a pressure ramp setpoint and outlet steam is isolated from the plant turbine and directed through position controlled bypass valve means. When steam temperature and pressure conditions are matched, the oncoming boiler isolation valve is opened and the bypass flow then existing is stored in a memory. The oncoming boiler bypass flow is cut back with total oncoming boiler steam flow controlled to the memorized flow valve as a setpoint. Flow from the on-line boiler is cut back under load control as the oncoming boiler flow to the plant turbine is increased. Deblending is implemented in a similar manner.
摘要翻译： 在发电厂中为两台以上的锅炉提供蒸汽混合控制。 为了将即将到来的锅炉与在线锅炉混合，即将到来的锅炉被激发到压力斜坡设定点，出口蒸汽与工厂涡轮机隔离并且通过位置控制的旁通阀装置引导。 当蒸汽温度和压力条件匹配时，即将到来的锅炉隔离阀打开，然后存在的旁路流量存储在存储器中。 随着即将到来的锅炉蒸汽流量被控制到存储的流量阀作为设定点，即将到来的锅炉旁路流量被切断。 随着随着锅炉流向工厂涡轮机的流量的增加，来自在线锅炉的流量在负载控制下被切断。 去混合以类似的方式实现。
-
6.发明授权
公开(公告)号：US4178762A
公开(公告)日：1979-12-18
申请号：US889764
申请日：1978-03-24
CPC分类号： F22B35/06 , F01D17/18 , F01K13/02 , F05D2220/50
摘要： An efficient valve position controller adapted for use in a steam turbine power plant for efficiently positioning a plurality of steam admission valves to substantially effect a desired power generation level is disclosed. The power plant includes a boiler for generating steam to the turbine at a boiler throttle pressure that is governed by a pressure set point; a valve control means which is governed by a reference signal corresponding to the desired power generation level to position the plurality of steam admission valves in a state according to a predetermined valve positioning pattern based on the value of the reference signal; and an electrical generator driven by the steam turbine to generate electrical energy. A plurality of values of the reference signal are predetermined as being related to efficient valve position states for regulating steam admission to the turbine. The controller adjusts the pressure set point at a desired rate and in a direction as determined by the difference between a selected one of the predetermined values and a present value of the reference signal. Accordingly, the reference signal is modulated as a function of the pressure set point adjustment until the reference signal is substantially equal to the selected value at which time the reference signal is governing the valves substantially at an efficient valve position state and further pressure set point adjustment is inhibited. In addition, when the reference signal becomes equal to a predetermined threshold value which is indicative of the steam admission valves being substantially wide open, the pressure set point is adjusted to a preset value.
摘要翻译： 公开了一种适用于汽轮机发电厂的高效率阀门位置控制器，用于有效地定位多个蒸汽入口阀，从而基本上实现了所需的发电量。 发电厂包括锅炉，其以由压力设定点控制的锅炉节流压力向涡轮机产生蒸汽; 阀控制装置，其由对应于期望发电水平的参考信号控制，以基于参考信号的值根据预定的阀定位模式将多个蒸汽进入阀定位在状态; 以及由蒸汽轮机驱动以产生电能的发电机。 参考信号的多个值被预先确定为与用于调节进入涡轮机的蒸气的有效的阀位置状态有关。 控制器以期望的速率和由所选择的一个预定值与参考信号的当前值之间的差确定的方向来调节压力设定点。 因此，参考信号被调制为压力设定点调整的函数，直到参考信号基本上等于所选择的值，此时参考信号基本上控制阀处于有效的阀位置状态，并且进一步的压力设定点调整 被抑制。 此外，当参考信号变得等于表示蒸汽进入阀基本上敞开的预定阈值时，压力设定点被调整到预设值。
-
公开(公告)号：US4976108A
公开(公告)日：1990-12-11
申请号：US521869
申请日：1990-05-11
摘要： A method and apparatus for controlling the operation of a steam turbine system, which system includes a source of steam under a controllable pressure, a plurality of governor valves connected between the source and the turbine first stage, each governor valve being movable between two selected positions each creating minimum steam flow throttling losses, a system control device (2) for producing a system control signal representative of the desired power level to be supplied by the turbine system, and a governor valve control (8) connected for producing a valve control signal in response to an input signal and for positioning each governor valve in accordance with the value of the valve control signal. During operation, the input signal to the governor valve control (8) is given a value which is based on the system control signal and which causes the valve control signal to have a value which will place each governor valve at least approximately at a selected position. In order to position the governor valves more accurately, the rate of flow of steam from the steam source is measured (18); the difference between the measured rate of flow and the expected rate of flow of steam from the steam source is determined (20, 24); and the value of the input signal to the governor valve control is modified (6, 12) in response to the difference determined in a direction to vary the positions of the governor valves in a manner to reduce the magnitude of that difference.
摘要翻译： 一种用于控制蒸汽轮机系统的操作的方法和装置，该系统包括在可控压力下的蒸汽源，连接在源和涡轮机第一级之间的多个调节阀，每个调节阀可在两个选定位置 每个产生最小的蒸汽流量节流损失，用于产生表示由涡轮机系统提供的期望功率水平的系统控制信号的系统控制装置（2）和连接用于产生阀控制信号的调速阀控制装置（8） 响应于输入信号并根据阀门控制信号的值定位每个调节阀。 在操作期间，给调速阀控制（8）的输入信号被赋予一个基于系统控制信号的值，并且使得阀控制信号具有一个值，该值将使每个调节阀至少大致位于选定位置 。 为了更准确地定位调速阀，测量蒸汽源的蒸汽流速（18）; 确定测量的流量与来自蒸汽源的蒸汽的预期流量之间的差异（20,24）; 并且响应于以减小该差异的大小的方式改变调节阀的位置的方向上的差异来修改调节阀控制的输入信号的值（6,12）。
-
公开(公告)号：US4068475A
公开(公告)日：1978-01-17
申请号：US678525
申请日：1976-04-20
申请人： Morton H. Binstock
发明人： Morton H. Binstock
CPC分类号： F22B35/14
摘要： A once-through boiler is provided with integral separators with which drain valves are associated. Boiler inlet and outlet flows are balanced throughout startup first by drain valve control in response to separator level and then by drain valve control in response to throttle pressure.
摘要翻译： 一个直通式锅炉设置有与排放阀相关联的整体分离器。 锅炉入口和出口流量首先通过排放阀控制响应于分离器水平平衡，然后通过排放阀控制响应节气门压力平衡。
-
公开(公告)号：US4135854A
公开(公告)日：1979-01-23
申请号：US751404
申请日：1976-12-16
CPC分类号： F04D29/362 , F04D27/002
摘要： The disclosed system detects the pressure rise across the fan and the flow rate in the system and integrates signals corresponding thereto, and outputs a signal to indicate to the user when the pressure rise exceeds a given level for a corresponding flow rate to warn of a condition within a given degree of a stall condition. The system outputs another signal to block any increase in fan blade pitch and substitutes a decrease pitch signal in response to a predetermined closer approach to a stall condition so that the pitch of the blades is reduced to a position in which the pressure rate rise and flow rate are reduced to a safe level with respect to a stall condition. The system also includes means responsive to the predetermined closer approach to stall to prevent the user from feeding a blade pitch increase signal following a reduction in the pressure rise across the fan until the user resets a bistable device.
摘要翻译： 所公开的系统检测风扇上的压力升高和系统中的流量，并对与之对应的信号进行积分，并且输出信号以向用户指示当压力上升超过给定水平时，对于相应的流量来警告状况 在给定的档位条件下。 该系统输出另一信号以阻止风扇叶片间距的任何增加，并且响应于预定的接近失速状态而代替减小音调信号，使得叶片的桨距减小到压力升高和流动的位置 速率相对于失速状况降低到安全水平。 该系统还包括响应于预定的更接近的失速方式的装置，以防止用户在跨过风扇的压力降低减小直到用户复位双稳态装置之后进给叶片俯仰增加信号。
-
公开(公告)号：US4019467A
公开(公告)日：1977-04-26
申请号：US678526
申请日：1976-04-20
申请人： Morton H. Binstock
发明人： Morton H. Binstock
摘要： A once-through boiler is provided with integral separators and a plurality of valves for controlling fluid flow during boiler startup. A pressure control generates an open or close signal for all of the valves and a sequence selector responds to the pressure control and a valve-in-operation logic circuit to generate valve selection signals which enable the valves to respond sequentially to the pressure control output.
摘要翻译： 一个直流锅炉设置有整体分离器和多个用于控制锅炉启动期间的流体流量的阀。 压力控制为所有阀门产生开启或关闭信号，并且顺序选择器响应于压力控制和阀门操作逻辑电路，以产生阀门选择信号，使得阀门能够依次响应于压力控制输出。
-
-
-
-
-
-
-
-
-
搜索结果
12 条记录 (耗时 0.021 秒)
