Gutehoffnungshutte Sterkrade Aktiengesellschaft

Maschinenfabrik Augsburg-nurnberg Aktiengesellschaft

M.a.n. Uternehmensbereich G.h.h. Sterkrade

Man Maschinenfabrik Unternehmensbereich Ghh Sterkrade

Wilfried Blotenberg

Rolf Albers

A method and arrangement for controlling the operation of turbo compressors, particularly those of high capacity, utilizes flow rate and pressure values for an analog controller as well as a computing circuit to optimize the operation of the compressor. The compressor is assumed to have a characteristic basic linear blowoff line and an optimum non-linear blowoff line on its pressure/flow curve. The calculating or computing circuit computes an error signal representing a difference between the basic and optimum blowoff line at an operating pressure and applies the signal to the analog controller which controls the compressor to its optimum extent. An analog system connected to the controller maintains control at least according to the basic blowoff line if the computing circuit fails.

Method and apparatus for operating turbo compressor using analog and

A method and apparatus for operating parallel connected turbocompressors jointly controls their operation such that each operates at the same percentage of its capacity, i.e. such that the spacing of the operating point of each from its blowoff line which is parallel to its pumping limit is the same.

Method and apparatus for controlling at least two parallel-connected

A method of limiting the discharge pressure for turbo compressors by means of a blowoff control which is controlled by an anti-surge controller along with means for measuring the discharge pressure and an extreme value selector as well as means for measuring the pressure flow rate and for generating a signal from a manual controller, comprises, measuring the discharge pressure, comparing the measured pressure with a desired maximum pressure to produce a pressure control signal, measuring the compressor flow rate, comparing the measured flow rate with a minimum permissible flow rate to provide a flow rate control, directing a signal from a manual controller to the value selector to generate a manual controller signal and feeding each of the pressure control signal, flow rate control signal, and manual controller signal to the anti-surge controller to provide a control of the blowoff valve in accordance therewith.

Method and apparatus for limiting the end thrust of turbo compressors by

An improved method of cooling compressed gases intermediate successive compressive stages in a multi-stage intercooled compressor system without forming condensate is provided. Cooling water flow to an intercooler intermediate successive compressive stages is regulated as a function of the actual temperature of the gas downstream of the intercooler and a set point temperature generated as a function of a linear approximation relating the inlet dew point temperature and the pressure of the gases downstream of the intercooler.

Method of intermediate cooling of compressed gases

A process and apparatus for operating a turbocompressor having an output at an actual value of flow and pressure and a blow-off valve for regulating the output to prevent surging of the output above a surge limit and to prevent a reduction of the output below a minimum value, with a comparing unit for measuring the actual value, and a controller unit for controlling the blow-off valve in accordance with the output of the comparing unit comprising, forming a first difference value between the theoretical value and the actual value, forming a delayed value from the difference value and thereafter forming a second difference value between the delayed value and the first difference value to control the blow-off valve. The apparatus for effecting the process comprises summing units for forming the various difference values, a delay unit for delaying the first difference value and, in one embodiment, a limiter unit for limiting the second difference value which is thereafter added to the theoretical value before the resulting value is applied to the controller unit for controlling the blow-off valve.

Growing community of inventors

Oberhausen, Germany

Wilfried Blotenberg