JPS60202203A - Discharge combustion method - Google Patents

Abstract

PURPOSE:To improve the combustion efficiency of a combustion apparatus such as a boiler, and to prevent atmospheric pollution by exhaust gas by executing arc and glow discharge between an electrode at the nose of a spray port through an insulator and an internal electrode in a combustion nozzle spraying fuel. CONSTITUTION:There are an electrode 6 and a susceptor 7 at the center of a nozzle, and a space between a nozzle chip 3 and the electrode 6 is adjusted to 1-10mm.. A negative electrode for a DC power supply boosted to 1,500-2,000V is connected to a pipe 10 for fuel and an operating gas and an anode to the nozzle chip 3, and a ballast resistor is positioned on its midway of the pipe. A high frequency generating circuit used as a starter is connected in series. Glow and arc discharge are executed between the nozzle chip 3+ and the electrode 6- while fuel is sprayed from a spray port 2 by the operating gas. A thermal effect generated by glow and arc discharge and the promotion of combustion by ions and radicals of fuel and the operating gas formed result in the increase of the stability of a flame and the reduction of soot.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention aims to improve the combustion efficiency of combustor equipment such as boilers and prevent air pollution caused by exhaust gas.

The main cause of air pollution from combustion exhaust gas is soot and dust, NO! It is still not fully resolved. The method detailed below is
The aim is to reduce both of these substances and to save energy through low-oxygen combustion. The present invention will be described below based on embodiments shown in the accompanying drawings.

(+1 Shape of the Nozzle As shown in Fig. 1, the nozzle outer cylinder 1 made of a ceramic insulator has a metal nozzle tip 8 with a large number of fuel spray ports 2 at the tip. A pipe IO into which working gas flows and a support base having passages 4 and 5 are screwed together.

At the center of the nozzle are an electrode rod 6 and a support base 7, which can be replaced by screws. In order to improve the mixing of fuel and operating gas, the cone 8 is inserted into the mixing chamber after passing through the slit.
has been established. Everything except the ceramic outer cylinder 1 is made of metal, and the distance between the nozzle tip 3 and the electrode 6 is adjusted to 1-10fl. The fuel and working gas are pressurized by a pump or compressor (depressurized if using an N2 cylinder), passed through an insulated pipe 8, and then passed through the pipe +0. Connect to nozzle 1. Nozzle 1. Put the pipe IO into the ceramic insulating pipe 9 and fix it with only the tip slightly protruding. The nozzle tip 8 should be considered a consumable item and can be replaced.

(2) Discharging method As shown in Fig. 2, the negative electrode of a DC power supply boosted to 1500-2000 V is connected to the fuel and working gas pipe IO, the anode to the nozzle tip 3, and a stabilizing resistor is placed in the middle. A high frequency generation circuit used as a starter is also connected in series. After the fuel is sprayed from the spray nozzle 2 using a working gas, glow and arc discharge are performed between the nozzle tip 3 and the electrode 60.

The discharge current value varies depending on the amount of fuel sprayed.

If the amount of combustion is large, is it necessary to increase the current value?
It becomes possible to lower the no-load voltage.

The current value is adjusted with a stabilizing resistor.

(3) Discharge effect The thermal effect generated by glow and arc discharge and the promotion of combustion by generated fuel and working gas ions and radicals result in increased flame stability and reduced soot. The stability of the flame makes it possible to stir and mix the secondary air with the fuel at high speed and completely, bringing the amount of secondary air close to the theoretical amount of air and saving energy.

Especially when nitrogen is used as the working gas, N2 → 2 due to discharge
Is it a nitrogen atom that becomes N, or does it react with NOy generated during combustion? NO+N-4-N2+O acts as a reducing agent.
■, N+02→No+0■+N 2 +02→2N
O■.

This is because the reaction of (1) is always 100 to 1000 times faster than the reaction (2). When air is used as the working gas, NO! due to the reaction (■). lead to an increase in c. When combustion exhaust gas is used as the working gas, the oxygen concentration is low and approaches that when nitrogen gas is used, leading to a reduction in N0In.

[Brief explanation of the drawing]

FIG. 1 shows a two-fluid combustion nozzle modified for discharge. FIG. 2 shows the nozzle connected to a discharge power source. l Discharge nozzle outer cylinder (made of insulating ceramic) 2 Spray port, 3 Nozzle tip, 45 Fuel, working gas passage,
6 - Discharge electrode rod, 7 - Electrode support stand, 8 - Insulated pipe (to avoid powering the pump and compressor), 9 - Insulated ceramic pipe, 10 - Fuel, working gas pipe, ll
High-frequency generator patent applicant Michio Nakanishi Engraving of drawings (no changes in content) 6th Frog Rei procedure amendment (method) % formula % 1. Indication of the case 1982 Patent application No. 058792 2. Invention Name: Discharge combustion method 8, Relationship with the case of the person making the amendment Patent applicant: 4 Date of the amendment order: 6 Contents of the amendment

Claims (2)

[Claims] (1) In a combustion nozzle that sprays fuel, a method of spraying and burning fuel while performing arc and glow discharge between the tip electrode of the spray nozzle and the internal electrode via an insulator. (2) The combustion method according to item 1 above, in which nitrogen gas or combustion exhaust gas is cooled and compressed and used as the working gas for atomizing the fuel.