Device for providing reverse heating and method of reverse heating

Abstract

A method of reverse heating using intermittent temperature zones at normal pressure, including: 1) introducing hydrothermal water or steam to a heating coil inside intermittent temperature zones of cabinets of a heating device via a duct along a first direction; 2) introducing combusted high temperature flue gas to a hydrothermal radiation coil inside the cabinets of the heating device via a gas duct along a second direction which is a reverse direction of the first direction; and 3) at normal pressure, heating the hydrothermal water or steam by the flue gas and a heat transfer medium inside the cabinets of the heating device. A heating device for use in the method is also provided. The method and device feature high thermal efficiency at low cost.

The invention claimed is: 
     
         1 . A method of reverse heating, the method comprising the steps of:
 a) introducing hydrothermal water or steam to a heating coil inside intermittent temperature zones of cabinets of a heating device via a duct along a first direction;   b) introducing combusted flue gas to a hydrothermal radiation coil inside the cabinets of the heating device via a gas duct along a second direction which is a reverse direction of the first direction; and   c) at normal pressure, heating the hydrothermal water or steam by the flue gas and a heat transfer medium inside the cabinets of the heating device.   
     
     
         2 . The method of  claim 1 , wherein the intermittent temperature zones refer to intermittent or independent temperature zones, created inside the cabinets of the heating device due to varied heat transfer medium therein; and the heating device comprises a plurality of series-connected cabinets and two adjacent cabinets are connected. 
     
     
         3 . The method of  claim 1 , wherein
 the reverse direction means that the flue gas enters from the top of the cabinets and heat energy is transferred by radiation from top to bottom through the hydrothermal radiation coil;   the hydrothermal water or steam enters from the bottom of the cabinets and flows from bottom to top through the heating coil; and   the hydrothermal radiation coil exchanges heat energy with the heat transfer medium and the hydrothermal water or steam downstream and the hydrothermal water or steam and flue gas flow in a reverse direction.   
     
     
         4 . The method of  claim 1 , wherein the normal pressure means that pressure is to be released via an overflow pipe when pressure inside the cabinets exceeds the normal pressure and the heat transfer medium discharged during the pressure relief is collected by a waste box via a discharge pipe. 
     
     
         5 . The method of  claim 1 , wherein the heat transfer medium is a fluid of water, oil, sodium, lithium, mercury, and fused salt. 
     
     
         6 . A heating device comprising intermittent temperature zones for comprehensive utilization of recovered waste heat at normal pressure, comprising:
 a) a plurality of cabinets;   b) a flue gas cyclic heating circuit;   c) a hydrothermal water or steam cyclic heating duct; and   d) a control system; wherein   the flue gas cyclic heating circuit and the hydrothermal water or steam cyclic heating duct flow in a reverse direction.   
     
     
         7 . The heating device of  claim 6 , wherein the cabinets are in a shape of square, rectangle, cylinder, or elliptic cylinder, with an upper end of each of the cabinets arranged with an overflow pipe, and the hydrothermal radiation coil and the heating coil are arranged in parallel and distributed evenly in reticulation inside the cabinets. 
     
     
         8 . The heating device of  claim 6 , wherein the flue gas cyclic heating circuit is in an enclosed annular structure comprising a heat generator, the hydrothermal radiation coil, a waste heat exchanger, a coil heat exchange pipe, an air intake fan, and a gas mixture supply duct. 
     
     
         9 . The heating device of  claim 6 , wherein the hydrothermal water or steam cyclic heating duct is in an enclosed annular structure comprising a duct, the heating coil, a duct exit, a heat receiver, and a check valve. 
     
     
         10 . The heating device of  claim 6 , wherein a temperature detector connecting with a temperature controller is arranged inside each of the cabinets. 
     
     
         11 . The heating device of  claim 6 , wherein the normal pressure means that pressure is to be released via an overflow pipe when pressure inside the cabinets exceeds the normal pressure.