JPS5933393A - Carburation of gas with low calorific value - Google Patents

Abstract

PURPOSE:To improve the heating energy in the carburation of a gas with a low calorific value and reduce the cost, by mixing the low calorie gas with a vaporized petroleum gas obtained by heat exchange between a liquefied petroleum gas and heating water running through piping. CONSTITUTION:In a multi-tube heat exchanger 1 equipped with buckles 33, 35, etc., a liquefied petroleum gas is passed through a line 3 and is sprayed by a sprayer 5. Heating water goes into the multi-tube heat exchanger 1 through a line 7 and undegoes heat exchange with the sprayed liquefied petroleum gas for vaporization of the gas before it is discharged from a line 15 via piping 9, 11, 13, etc. The low calorie gas fed from a line 17 is mixed with the vaporized petroleum gas in the multi-tube heat exchanger 1 and a mixed gas with a predetermined calorific value is sent out of the equipment from a line 21.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of increasing the heat of a low calorific value gas, and more particularly to a method of increasing the heat of a low calorific value gas by adding and mixing petroleum gas.

There are regulations on the calorific value of city gas, and if the calorific value of the gas used is lower than this regulation value.

It is necessary to increase the heat by mixing a high calorific value gas. The most commonly used heating method is to heat and vaporize liquefied petroleum gas (hereinafter referred to as LPG) using a heat source such as steam or hot water, and convert it into low calorific value gas such as reformed petroleum gas or coal gas. Melt using a mixing method. however,
Jin's method requires heating energy to produce steam, hot water, etc., and has the disadvantage of high costs.

The present inventor has conducted various research in view of the shortcomings of the conventional methods such as the one used in the first century, and has discovered that a multi-tube heat exchanger using seawater, heated wastewater, etc. (hereinafter simply referred to as heat source water) as a heat source has been developed. In the case where LPG is dispersed and vaporized in a low calorific value gas stream and the vaporized petroleum gas and the low calorific value gas are mixed to increase heat, the problems of the prior art are substantially eliminated. I found it. That is, the present invention provides LPG by heat exchange between LPG sprayed from a liquid distribution device into a low calorific value gas stream and heat source water flowing in the pipes in a multi-tubular heat exchanger using water as a heat source.
The present invention relates to a method for increasing the heat of a low-heat-generating needle gas, which is characterized by heating and vaporizing PG and mixing the obtained vaporized petroleum gas with a low-heat-generating gas.

The present invention will be explained in more detail below with reference to examples of the apparatus used in the method of the present invention shown in the drawings.

As shown in Figure 1, the baffle (to),...
In the shell-and-tube heat exchanger (1) equipped with
It is sprayed from line (3) via liquid spraying device r* (5). Heat source water is transferred from line (7) to multi-tube heat exchanger (1)
LPG was sprayed while being discharged from the line 0 o'clock after passing through the pipe group (9), θ1), 01...
This is heated and vaporized by exchanging heat with the The low heat generation IW gas supplied from the line (17) is placed in the shell-and-tube heat converter (1), where it is sequentially mixed with vaporized petroleum gas and converted into a mixed gas having a predetermined exothermic concentration through the line 62.
It is sent out from the device from p.

Example 1 A liquid spraying device was arranged in 8 spans in a multi-tubular heat exchanger (1) of the type shown in Fig. 1, and the heat generation amount was 8000 kcal/N.
The naphtha reformed gas was heated to a pressure of 9 atm.

The specifications of the shell-and-tube heat exchanger used are as follows.

Heat transfer surface cough: 822F, gas distribution area: 2.00y/.

Number of baffles: 15, heat exchanger tube outer diameter: 15.911Jl
l.

Number of heat exchanger tubes - 675, heat exchanger tube length: 3? fl.

Spraying 18.6 t/h of LPG from each liquid spraying device,
By heat conversion with 100t/h of seawater at a temperature of 15°C, c.
al Heat 1182000/N, / vaporized petroleum gas, and naphtha reformed gas 2200ON7'//ht-
Mixed, kQ &, 1 exothermic 11000 /N, / mixed gas 2720
0”/ht-1 left.

Thus, compared to the conventional method of using vaporized petroleum gas obtained by heating with steam for heating, approximately 1.6 X t
o' k0a17hox Nelkika1lii! l[shi&.

[Brief explanation of the drawing]

FIG. 1 is a drawing showing an example of a shell-and-tube heat exchanger used in the method of the present invention. (1)...Multi-tube heat exchanger, (3)...LPG supply line, (6)...Liquid distribution equipment fM, (7)...
Heat source water supply line, (9), α1. OI...Piping group for heat source water, θQ...discharge line for heat source water, α power...low calorific value gas supply line, Ql...mixed gas delivery line. (or more) @1 Figure 1

Claims (1)

[Claims] ■ In a shell-and-tube heat exchanger that uses water as a heat source, liquefied petroleum gas is heated and vaporized by heat exchange between liquefied petroleum gas, which is sprayed from a liquid distribution device into a low calorific value gas stream, and heat source water flowing inside the pipes. A method for increasing the heat of a low calorific value gas, characterized by mixing the obtained vaporized petroleum gas and the low calorific value gas.