Liquid Fuel Combustion System

Abstract

A liquid fuel combustion system is provided. The system comprises: a combustion stove, comprising a vaporization unit with a ring shape vaporization space, a burner assembly and a first pipeline; a liquid fuel storage tank, having a storage space; a second pipeline, having a third opening end open to the storage space and a fourth opening end open to the ring shape vaporization space; and a liquid fuel composition contained in the storage space, comprising a liquid fuel and an ignition promoter which provides a vapor pressure in the storage space, whereby the vapor pressure drives the liquid fuel composition to be delivered out the storage space through the second pipeline, vaporized in the ring shape vaporization space and then delivered by the first pipeline to the burner assembly.

What is claimed is: 
     
         1 . A liquid fuel combustion system, comprising:
 a combustion stove, comprising:
 a vaporization unit with a ring shape vaporization space; 
 a burner assembly, comprising a burning head, a first jet opening, and a burning tube connecting the burning head to the first jet opening, wherein the burning tube has at least one air opening; and 
 a first pipeline, having a first opening end open to the ring shape vaporization space and a second opening end open to the first jet opening; 
   a liquid fuel storage tank, having a storage space;   a second pipeline, having a third opening end open to the storage space and a fourth opening end open to the ring shape vaporization space; and   a liquid fuel composition contained in the storage space, comprising:
 a liquid fuel selected from the group consisting of C1-C4 alcohols, liquid hydrocarbons and combinations thereof; and 
 an ignition promoter, which is a high volatile hydrocarbon having a flash point lower than the liquid fuel and provides a vapor pressure in the storage space, wherein the amount of the ignition promoter is at least about 1 wt % based on the weight of the liquid fuel, 
   
       whereby the vapor pressure drives the liquid fuel composition to be delivered out the storage space through the second pipeline, vaporized in the ring shape vaporization space and then delivered by the first pipeline to the burner assembly. 
     
     
         2 . The system according to  claim 1 , wherein the ring shape vaporization space is formed in a hollow disc shape or a hollow bowl shape expanding up- and outward. 
     
     
         3 . The system according to  claim 1 , wherein the combustion stove further comprises an apron connected to the lower part of the vaporization unit. 
     
     
         4 . The system according to  claim 1 , wherein the combustion stove further comprises a second jet opening installed in the first pipeline. 
     
     
         5 . The system according to  claim 4 , wherein the first pipeline has a first inner diameter D 1  at the section from the first opening end to the second jet opening and a second inner diameter D 2  at the section from the second opening end to the second jet opening, and D 1 >D 2 . 
     
     
         6 . The system according to  claim 5 , wherein D 1  is more than 1 mm and not more than 8 mm and D 2  is not less than 1 mm and not more than 5 mm. 
     
     
         7 . The system according to  claim 1 , wherein the inner diameter of the air opening ranges from about 3 mm to about 6 mm. 
     
     
         8 . The system according to  claim 1 , wherein the combustion stove comprises a plurality of burner assemblies, and each of them comprises a burning head, a burning tube and a first jet opening; and the first pipeline has a plurality of second opening ends individually open to one of the first jet openings. 
     
     
         9 . The system according to  claim 8 , wherein the first pipeline has a multi-direction manifold. 
     
     
         10 . The system according to  claim 1 , wherein the third opening end is installed within the storage space. 
     
     
         11 . The system according to  claim 1 , which further comprises a flow control element or an ignition switch with flow control function installed on the second pipeline. 
     
     
         12 . The system according to  claim 1 , wherein the second pipeline further comprises a fifth opening end below the air opening and equipped with an ignition unit. 
     
     
         13 . The system according to  claim 1 , wherein the second pipeline tilts downward to open to the ring shape vaporization space. 
     
     
         14 . The system according to  claim 1 , wherein the ignition promoter is in an amount ranging from about 1 wt % to about 8 wt % based on the weight of the liquid fuel. 
     
     
         15 . The system according to  claim 1 , wherein the ignition promoter is selected from the group consisting of liquefied petroleum gas (LPG), propane, butane, pentane, hexane, petroleum ether, dimethyl ether and mixtures thereof. 
     
     
         16 . The system according to  claim 1 , wherein the liquid fuel composition further comprises:
 a stabilizer being selected from the group consisting of ketone(s), ether(s), a polymer with a molecular weight of less than about 5,000 Dalton, and combinations thereof; and   a heat transfer promoter being soluble in the liquid fuel and having a thermal conductivity ranging from about 0.20 W/M-K to about 0.65 W/M-K,   
       wherein the stabilizer is in an amount of not higher than about 5 wt % and the heat transfer promoter is in an amount of not higher than about 15 wt %, based on the weight of the liquid fuel. 
     
     
         17 . The system according to  claim 16 , wherein stabilizer is selected from the group consisting of acetone, methyl ethyl ketone (MEK), dimethyl ether (DME), diethylene glycol (DEG), polyethylene glycol (PEG) with a molecular weight of less than about 5,000 Dalton, a polymer with a molecular weight of less than about 5,000 Dalton and having one or more hydrophilic functional group in its main chain, and combinations thereof; and the heat transfer promoter is selected from the group consisting of ethylene glycol, glycerol, ethylene diamine, water and combinations thereof. 
     
     
         18 . The system according to  claim 17 , wherein in the polymer with a molecular weight of less than about 5,000 Dalton and having one or more hydrophilic functional group in its main chain, the hydrophilic functional group is independently an ether group, an ester group, an amino, a carboxyl (—COOH), or a thiol (—SH). 
     
     
         19 . The system according to  claim 16 , wherein the amount of the stabilizer is from about 0.5 wt % to about 5 wt % and the amount of the heat transfer promoter is from about 1 wt % to about 15 wt %, based on the weight of the liquid fuel. 
     
     
         20 . The system according to  claim 19 , wherein the liquid fuel composition comprises about 4 wt % to about 6 wt % LPG as the ignition promoter, about 1 wt % to about 3 wt % methyl ethyl ketone as the stabilizer and about 3 wt % to about 10 wt % water as the heat transfer promoter, based on the weight of the liquid fuel; and the liquid fuel is methanol.