초록 ▼

A system for recovering the waste heat normally exhausted into the atmosphere by chemical or other processing plants. The invented system comprises a heat exchange apparatus located in the exhaust stack or flue passage, heat transfer means for carrying the waste heat absorbed from the exhaust gases

A system for recovering the waste heat normally exhausted into the atmosphere by chemical or other processing plants. The invented system comprises a heat exchange apparatus located in the exhaust stack or flue passage, heat transfer means for carrying the waste heat absorbed from the exhaust gases to a location remote therefrom, and a second heat exchange apparatus for releasing the transferred waste heat for beneficial use at said remote location. The present invention also includes temperature and pressure control means which enhance the safety and efficiency of the system\s operation. The heat transfer means disclosed in this invention is a high temperature liquid (and associated pumping and piping means) capable of withstanding temperature up to 900 F. without flashing, changing state, or corroding the heat exchange apparatuses.

대표청구항 ▼

A method of recovering waste heat in a processing system, the latter having of an exhaust stack through which exhaust gases are discharged, and heating a recipient fluid at a point remote from said exhaust stack, the method comprising the steps of: (a) disposing a first heat exchanger within said ex

A method of recovering waste heat in a processing system, the latter having of an exhaust stack through which exhaust gases are discharged, and heating a recipient fluid at a point remote from said exhaust stack, the method comprising the steps of: (a) disposing a first heat exchanger within said exhaust stack such that said exhaust gasses will flow across its surfaces; (b) disposing a second heat exchanger at said point remote from said exhaust stack such that said recipient fluid will flow across its surfaces; (c) coupling the inlet of said second heat exchanger in communication with the outlet of said first heat exchanger, and the outlet of said second heat exchanger in communication with the inlet of said first heat exchanger through conduit means, so as to define a closed circuit; (d) providing a reservoir for storing heat transfer fluid in communication with said closed flow circuit; (e) providing means for forcing heat transfer fluid to circulate through said closed flow circuit, said forcing means being disposed serially within said closed flow circuit; (f) providing a heat transfer fluid in said closed flow circuit and said reservoir; (g) controlling the temperature of said heat transfer fluid at least two critical points within said closed flow circuit by (i) sensing at least two temperatures, each at a point at which the temperature of said heat transfer fluid is critical; (ii) monitoring the temperatures sensed to detect an out-of-balance condition due to a change in the desired temperature of said fluid at any of said critical points and to provide a control signal in response thereto; and (iii) controlling a solenoid operated temperature control valve disposed serially in said closed flow circuit with said control signal so that the position of said valve determines the rate of flow of said heat transfer fluid therein; (h) controlling the pressure of said fluid by: (i) providing a by-pass flow circuit comprising conduit means between the inlet of said second heat exchanger and said reservoir; (ii) providing a solenoid-operated pressure control valve serially in said by-pass flow circuit, the position of said valve determining the rate of flow of said heat transfer fluid therein; (iii) providing a pressure transducer at a point within said by-pass flow circuit, and (iv) controlling said solenoid operated pressure control valve by the output of said pressure transducer; whereby, said heat transfer fluid will absorb waste heat from said exhaust gases as they pass through said first heat exchanger and rElease said recovered waste heat to said recipient fluid as it passes through said second heat exchanger, with the temperatures of said fluid at said critical points being maintained substantially within their desired ranges by said temperature controller and temperature valve adjusting the rate of flow of said fluid; and said temperature control valve adjusting the rate of flow of said fluid; and with the pressure of said fluid being maintained substantially within its desired range by said pressure transducer and pressure control valve adjusting the rate of flow of said fluid through said by-pass flow circuit.