JPH02252605A - Combustion equipment for reformer - Google Patents

Abstract

PURPOSE:To obtain a combustion equipment for reformer having high reliability to ignition by arranging an ignition means capable of simultaneously igniting a plurality of flame holes for firing means in the neighbor of flame hole for firing means. CONSTITUTION:In the actuation of fuel cell generator, preliminary combustion is carried out using a conventional fuel, e.g. city gas. Namely, air 201 for combustion is introduced from a blower into an air chamber B and successively city gas fuel 401 is introduced into a fuel jetting apace 502 of an ignition means 51 while scattering discharge spark to the ignition means 51 by discharge electrode 404 and simultaneously secondary air 201 is introduced in the neighbor of the space 502 and the city gas fuel 401 is fired with the means 51 and further circular flame 503 for ignition is produced. Meanwhile, air 201 from the fuel 401 and secondary air hole 202 is introduced into a pilot burner 41 and a plurality of pilot flame holes 402 are simultaneously ignited by the flame 503 to simultaneously provide a plurality of pilot flames 403. Consequently, even if some flames 403 are lost, firing is made instantly possible by flame 503.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a combustion device for a fuel reformer of a fuel cell power generation device.

[Conventional technology]

The basic configuration of the fuel cell power generation device is simplified and schematically shown in FIG. The basic component is the reformer (9)
The reformer (9) includes a combustor (904) for maintaining the temperature of the reforming reaction and supplying reaction heat, and a reforming furnace (902). C) A reforming reaction tube (903) filled with a reforming catalyst is housed inside. To start the fuel cell power generation device, first, the reforming combustor (904) uses conventional fuel such as city gas (13
A) and combustion air are supplied to perform preheating combustion. After the reaction tube (903) reaches a predetermined temperature sufficient for the reaction to proceed, reformed raw material gas (usually city gas (13A) or methanol) and steam (LO) are introduced into the reaction tube (903). . The reformed gas containing a large amount of hydrogen (H) that has been reformed in the reformer (9) passes through the Co converter (901) and becomes a fuel that is even more enriched than unreacted CO, H, and O. It becomes a gas and is supplied to the power generation cell main body (902).In the power generation cell main body (902), this H1-enriched reformed gas and the oxidizing agent air react through the electrolyte to obtain an electrical output and at the same time remove the H1 in the reformed gas. ! minute is consumed and discharged as battery off-gas. However, this battery off-gas contains unconsumed H, minute of about z.
-, 4) vol- remains, others are H, 0 and C
It is a low calorie combustible gas called O7 inert acid gas.

This battery off-gas, which is a low-calorie combustible gas, is again introduced into the reforming combustor (904), burned, and used to supply heat for the reforming reaction, thereby increasing the efficiency of the fuel cell power generation device.

In addition, at the time when low-calorie off-gas combustion is performed,
Preheating combustion has already stopped.

It goes without saying that the amount of combustion air to be supplied is also adjusted depending on the type and amount of fuel gas (low-calorie off-gas, high-calorie city gas, etc.) to be supplied.

In addition, as a combustion device, for example, Japanese Patent Application No. 63-7785
There is one shown in No. 3, and its outline is shown in Figure 5. Fifth
FIG. 5(a) is a sectional view of the main part, and FIG. 5(a) is a plan view of FIG. 5(a) viewed from the reforming furnace side. In the figure, (C) is a reforming furnace in which a reforming reaction tube (not shown) is housed. C
B) is installed adjacent to the reforming furnace (C) and is equipped with combustion air (2
01) is supplied to the air chamber, (A) is this air chamber CB)
A fuel chamber is provided adjacent to the fuel chamber and is supplied with fuel gas (101). (110) is a fuel pipe, one end of which opens into the fuel chamber (A) and the other end into the reforming furnace (C), which injects fuel gas (101) into the reforming furnace (C) and causes a flame. It becomes a hole.

(1 to 5 are walls respectively. Also, Fig. 5 (a)
) is complicated, so it is not shown in the figure, but the air chamber CB)
The wall that separates the reforming furnace (C) from the fuel pipe (IIQ) is equipped with multiple air injection holes adjacent to the fuel pipe (IIQ). Figure 5 (1
)). Figure 5(b) shows Figure 5(a) in a reforming furnace (C
) is a plan view seen from the side. In the figure, (210)
indicates an air vent. In this example, a large plate (211) with a large number of air injection holes (210) adjacent to the flame hole of the fuel pipe (110) is a wall that partitions the air chamber (B) and the reforming furnace (C). (3), for example by welding, and the fuel pipe (
110) and a large number of air jet holes (210) are assembled to form one main burner. Fuel again! (110)
has an inner diameter of several ysx, for example 5j11, and the fuel chamber (
It is fixed to the wall (5) that partitions A) and the air chamber (B), for example by welding, so that there is no gap, and is arranged so that the flame hole part protrudes into the reforming furnace (C) by several nanometers or less. ing. Furthermore, an ignition means, that is, a pilot burner for igniting the main burner is attached to the center of the four main burners arranged around the periphery, and a pilot flame hole (402) at the tip of the pilot burner is attached. A discharge electrode (404) for igniting the flame (403) is installed, and a flame detection electrode (40) for the pilot flame (403) is installed.
5) is installed to be inserted into the pilot flame (403). Additionally, there is a secondary air hole (2) for the pilot flame (403) at a position in contact with the air chamber CB of the wall (4).
20) is opened. (401) is fuel for the pilot flame (403).

Next, the operation will be explained. When starting the fuel cell power generation device, first, preheating combustion is performed using a conventional fuel, such as city gas (13A). That is, combustion air (201) is introduced from an air source, such as a blower, into the air chamber CB), and then the discharge electrode is also 0 to blow discharge sparks toward the pilot burner (B).
Pilot burner 0 is ignited by introducing city gas fuel (401) and combustion air (201) from the secondary air hole (220).

Pilot flame (
403) is generated, and the flame detection electrode (405) inserted into the pilot flame (403) and the pilot burner (
By applying a voltage between L4 and L4, a current flows through the flame, and ignition is detected based on the current value, thereby confirming ignition. When ignition is confirmed, city gas (13A) for preheating is introduced into the fuel chamber (A) and passes through the fuel pipe (110).
It diffuses and mixes with the combustion air ejected from the air nozzle (210) and ignites when it comes into contact with the pilot flame (403), and a combustion flame (102) is formed on the main burner, starting the reforming furnace (C). Preheat. After that, the reforming furnace (C)
When the temperature reaches the specified temperature, the city gas (1
Stop introducing 3A). After the preheating is completed, the preheating combustion is stopped and the raw material gas 10H,
The reformed gas that has been enriched with O and is then sent to the power generation cell (902
) and started generating power. Unconsumed H after power generation! The battery off-gas (101) containing the
4), and is passed from the fuel chamber (A) through the fuel pipe (110) to perform low-calorie off-gas combustion on the main burner. Needless to say, combustion air (201) is supplied at this time.

By the way, while the battery off-gas (101) is returning to the fuel chamber (A), if the main burner is not ignited or the load suddenly changes, the relationship between the fuel gas flowing to the power generation cell (902) and the power generation load is The balance may be disrupted and - sometimes extremely low-calorie battery off-gas (101) returns, causing the main burner to misfire. For this reason, the pilot burner Ql) needs to be kept in the ignition state at all times, and the reliability of ignition confirmation needs to be sufficiently high. To check the ignition of the pilot burner (L4), check the pilot flame (
403) A voltage is applied between the flame detection electrode (405) inserted inside and the pilot burner Oυ, the current flowing between them is detected and compared with a set value, and ignition is detected based on the current value. .

[Problem to be solved by the invention]

However, the conventional device described above uses a pilot burner (
A plurality of pilot flame holes (402) of 6) are ignited with one discharge electrode (404) to create a plurality of pilot flames (402).
03) and connects the fuel pipe (110) and air nozzle (2).
Since the mixture of fuel gas and air injected into the reforming furnace (C) from each of the pilot flames (403) is ignited, some of the pilot flames (403) are delayed in ignition. There are problems such as burning out and not igniting. This is because, especially in on-site type fuel cell power generation equipment, it is necessary to operate immediately in response to the load and to make the heating distribution uniform in the reformer (C), so it is possible that the reliability of ignition is low. This is one of the major drawbacks.

This invention was made to solve the above-mentioned problems, and an object thereof is to obtain a combustion device for a reformer that has high reliability in ignition.

[Means to solve the problem]

The combustion device for a reformer according to the present invention has ignition means disposed near the flame holes of the ignition means for simultaneously igniting a plurality of flame holes of the ignition means.

[Sakuma]

In the combustion device for a reformer according to the present invention, a plurality of flame holes of the ignition means are simultaneously ignited by the ignition means disposed near the flame holes of the ignition means.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. In each of these figures, (1) to (5).

(6), (401) ~ (,405) * (101)
−(102) * (110) * (201) p
(211) *(220) and (A) to CC) are similar to the configuration of the conventional device described above. 6υ is an annular ignition means installed near the pilot flame hole (402) of pilot burner 0υ;
]) A plurality of radially formed fuel introduction holes (501') and an annular fuel injection space (502) formed between the pilot burner 0◇, and an annular fuel injection space (502) arranged near the fuel injection space (502). The ignition flame (503) ignited by the discharge electrode (404) constitutes an ignition means 6J).

Next, the operation will be explained. When starting the fuel cell power generation device, first, preheating combustion is performed using a conventional fuel, such as city gas (13A). That is, combustion air (201) is introduced into the air chamber CB) from an air source, such as a blower, and then the fuel is ejected from the ignition means 61) while blowing a discharge spark from the ignition means 61) using the discharge electrode (404). space(
502) and the combustion air (201) from the secondary air hole (220) in the vicinity of the fuel injection space (502) of the ignition means←1). , the ignition means←1) ignites.

An annular ignition flame (503) is created by ignition of the ignition means 6υ
occurs. City gas fuel (4) to pilot burner 01)
01) and combustion air (20
1), an annular ignition flame (503
), a plurality of pilot flame holes (402) can be ignited simultaneously, and a plurality of Pyrower I flames (403) can be obtained simultaneously. Therefore, any pilot flame (403)
Even if there is a misfire, immediate ignition is possible with the annular ignition flame (503). After the pilot flame (403) is ignited, the operation is the same as that of the conventional device described above, so a description thereof will be omitted. As described above, since a plurality of pilot flames (403) are ignited at the same time, there is no one-ignition delay, and even if a misfire occurs, ignition is possible immediately, and reliability for ignition can be significantly improved. can. This is particularly effective in on-site fuel cell power generation devices.

〔Effect of the invention〕

This invention is as described above: t, r:% By disposing an ignition means for simultaneously igniting a plurality of flame holes of the ignition means in the vicinity of the flame hole of the ignition means, a plurality of flame holes of the ignition means can be ignited simultaneously. Thus, it is possible to obtain a combustion device for a reformer that has high reliability in terms of ignition.

[Brief explanation of drawings]

1 and 2 are a sectional view and an enlarged sectional view of essential parts showing a combustion device for a reformer according to an embodiment of the present invention, FIG. 3 is a sectional view taken along the line T' in FIG. 2, and FIG. FIG. 1 is a system diagram showing a general fuel cell system. FIG. 5(a) and @ are a cross-sectional view and a plan view seen from the reforming furnace side, showing a conventional combustion device for a reformer. In the figure, (6) is an ignition means, (402) is a flame hole,
(403) is a flame, and reference 1) is an ignition means. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] In a combustion device for a reformer having an ignition means for igniting fuel supplied to a reforming furnace in which a reforming reaction tube is housed with a flame, the ignition means is disposed near a flame hole of the ignition means, and a plurality of the ignition means are arranged near a flame hole of the ignition means. A combustion device for a reformer, characterized in that it is equipped with ignition means for simultaneously igniting the flame holes of the reformer.