Wastewater heat recovery apparatus

Patent · 01 September 1992

OSTI ID:7276005

Kronberg, J W

A heat recovery system is described with a heat exchanger and a mixing valve. A drain trap includes a heat exchanger with an inner coiled tube, baffle plate, wastewater inlet, wastewater outlet, cold water inlet, and preheated water outlet. Wastewater enters the drain trap through the wastewater inlet, is slowed and spread by the baffle plate, and passes downward to the wastewater outlet. Cold water enters the inner tube through the cold water inlet and flows generally upward, taking on heat from the wastewater. This preheated water is fed to the mixing valve, which includes a flexible yoke to which are attached an adjustable steel rod, two stationary zinc rods, and a pivoting arm. The free end of the arm forms a pad which rests against a valve seat. The rods and pivoting arm expand or contract as the temperature of the incoming preheated water changes. The zinc rods expand more than the steel rod, flexing the yoke and rotating the pivoting arm. The pad moves towards the valve seat as the temperature of the preheated water rises, and away as the temperature falls, admitting a variable amount of hot water to maintain a nearly constant average process water temperature. 6 figs.

• DOE Contract Number: AC09-89SR18035
• Assignee: PTO; EDB-94-088659
• Patent Number(s): A; US 5143149
• Application Number: PPN: US 7-718518
• OSTI ID: 7276005
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320304* -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Waste Heat Recovery & Utilization
CONTROL
DESIGN
DISPERSIONS
ENERGY RECOVERY
EQUIPMENT
HEAT RECOVERY
HEAT RECOVERY EQUIPMENT
HYDROGEN COMPOUNDS
LIQUID WASTES
MIXTURES
OXYGEN COMPOUNDS
PROCESS SOLUTIONS
SOLUTIONS
TEMPERATURE CONTROL
WASTE WATER
WASTES
WATER