Robert J Krowech

US Patent:

7237806, Jul 3, 2007

Filed:

Dec 7, 2005

Appl. No.:

11/295580

Inventors:

Robert J. Krowech - Eden Prairie MN, US
Darryl M. Nagel - Eden Prairie MN, US
Douglass R. Yaeger - Eden Prairie MN, US

International Classification:

F16L 3/04

US Classification:

2851361, 285196, 277598, 277603

Abstract:

A hot gas seal for a conduit penetrating the wall(s) of a vessel such as a heat recovery steam generator unit. The seal includes three serially-arranged, independent insulation segments or pillows. The pillow adjacent the vessel casing and the center pillow employ metal sheets to sandwich insulation therebetween. The center pillow travels laterally with the conduit. The third or outer pillow terminates in a split seal ring having a containment structure attached thereto.

US Patent:

7621237, Nov 24, 2009

Filed:

Aug 21, 2007

Appl. No.:

11/892306

Inventors:

Robert J. Krowech - Eden Prairie MN, US
Edward B. Congdon - Eden Prarie MN, US
Kevin M. Morales - Eden Prarie MN, US

Assignee:

HRST, Inc. - Enden Prairie MN

International Classification:

F22B 37/16

US Classification:

122 7R, 12223523, 12223514

Abstract:

An economizer for a heat recovery steam generator utilized to improve the efficiency of the Rankine cycle by preheating the water that flows to the evaporator section. The economizer multi-pass sections include up-flow tubes only. This arrangement greatly reduces thermal stresses on the tubes by ensuring that each individual tube in any fluid-flow pass operates at the same or similar temperature. The design of the invention does this by causing all tubes in any fluid-flow pass to have the same upwards fluid flow direction and similar fluid flow velocity. No unstable backflow (i. e. flow in the reverse direction) occurs in any of the tubes. Heated down-flow tube sections are totally eliminated in this design. Respective jumper pipes are provided to conduct the water from the top of an economizer panel to the bottom of an adjacent panel.

US Patent:

8002902, Aug 23, 2011

Filed:

May 15, 2008

Appl. No.:

12/153258

Inventors:

Robert J. Krowech - Eden Prairie MN, US

International Classification:

B08B 3/00

US Classification:

134 34, 134 39, 1510404, 254104

Abstract:

The boiler cleaning apparatus and method provides for cleaning the exterior surfaces of a heat exchanger. The apparatus and method include tools and steps, respectively, for temporarily spreading tubes with a wedge and holding open the tubes with a block to form and gain access to tube lanes. Once access to a lane is attained, a nozzle assembly having an outlet for blowing high velocity cleaning fluid is selected from a group of nozzle assemblies. The selected nozzle assembly will have an outlet for blowing fluid in a direction that effectively cleans the tubes adjacent the opened lane. After the tubes are cleaned the tool for holding the lane opened is removed and the process is repeated for another lane.

US Patent:

20130220238, Aug 29, 2013

Filed:

Feb 28, 2012

Appl. No.:

13/407354

Inventors:

Robert James Krowech - Eden Prairie MN, US

Assignee:

HRST, INC. - Eden Prairie MN

International Classification:

F22B 37/26

US Classification:

122491

Abstract:

A partitioned drum for a heat recovery steam generator comprising a first chamber and a second chamber. The first chamber has a chemical inlet for chemically treating a flow medium, at least one inlet for the flow medium and at least one outlet for the flow medium. The second chamber has one inlet for the flow medium and at least one outlet for the flow medium. The flow medium present in the first chamber is treated with a chemical to prevent flow assisted corrosion, while the flow medium present in the second chamber is available as a source of fluid for the boiler feed pump.

US Patent:

20140015203, Jan 16, 2014

Filed:

Aug 8, 2012

Appl. No.:

13/569764

Inventors:

Robert James Krowech - Eden Prairie MN, US

International Classification:

F16J 15/02

US Classification:

277616, 277590

Abstract:

A self-energizing seal includes a housing and a plurality of annular seal ring segments movable relative to the housing. The annular seal ring segments include a circumferential slot and a plurality of holes defining a flow passage into the circumferential slot. A plurality of self-energizing ring segments are disposed in the circumferential slot. The annular seal ring segments and the self-energizing ring segments establish a seal with the exterior of a pipe and permit movement of the pipe in a direction orthogonal to the axis of the pipe.

US Patent:

44149239, Nov 15, 1983

Filed:

Mar 1, 1982

Appl. No.:

6/353129

Inventors:

Denis G. Csathy - Minneapolis MN
Robert J. Krowech - Minneapolis MN

Assignee:

Deltak Corporation - Minneapolis MN

International Classification:

F22D 100

US Classification:

122 7R

Abstract:

A boiler for generating steam by the recovery of heat from a hot gas stream including an enclosed pressure vessel, a baffle dividing the interior of the vessel into upper and lower compartments, one or more upper headers in the upper compartment, a bundle of water tubes supported from the upper headers and extending into the lower compartment, one or more lower headers supported by the lower ends of the water tubes, and a shroud structure in the lower compartment of the boiler extending about the perimeter of the bundle of water tubes.

US Patent:

44210671, Dec 20, 1983

Filed:

Sep 7, 1982

Appl. No.:

6/415318

Inventors:

Robert J. Krowech - Minneapolis MN

Assignee:

Deltak Corporation - Minneapolis MN

International Classification:

F22B 3752
F28G 900

US Classification:

122390

Abstract:

A valve-controlled pneumatic actuator is used to actuate a movable cleaning head to remove soot, ash or other sediment from tubes, headers and other internal parts of a heat exchanger of the type used in coal gasification plants. A rotary sootblower tube is coupled to a stationary inlet tube in a chamber of the heat exchanger vessel where a hot, highly pressurized and dirty gas circulates. Both the actuator and the stationary inlet tube are fixed to the vessel so that seals for moving parts are avoided. In one embodiment, the blowing tube extends in the inlet tube to a free end, and in another embodiment the opposite end is mounted to rotate around a stub tube. The blowing medium is provided in a jet or blast through nozzles in the blowing tube to loosen soot in the internal parts of the heat exchanger. The blowing medium is also used to power the actuator. In another embodiment a rapper head is carried by an actuator shaft, and an actuator piston is moved through a rapid stroke to strike a lower header and loosen accumulated deposits with the resulting vibrations.

US Patent:

20160376986, Dec 29, 2016

Filed:

Jun 22, 2016

Appl. No.:

15/189193

Inventors:

- Eden Prairie MN, US
Samuel Shaw - Milfor ME, US
Robert James Krowech - Eden Prairie MN, US

Assignee:

HRST, Inc. - Eden Prairie MN

International Classification:

F02C 6/18
F02G 5/02

Abstract:

A heat transfer panel, or multiple panels, utilized to absorbed heat from the turbine exhaust gas as part of the Rankin cycle which simultaneously distributes the exhaust gas through the waste heat boiler. The panel varies the gas flow characteristics across a transverse and longitudinal plane, thereby eliminating the need for a separate flow distribution device.