JPH02213613A - Windproof equipment for combustion device - Google Patents

Abstract

PURPOSE:To conduct the combustion under an optimum condition in amount so as to raise the thermal efficiency and make the combustion least hazardous relating to the environment by providing a wind-pressure sensor that detects entry of wind in the direction in which the wind obstructs the discharge of exhaust gas to an exhaust pipe and by adjusting the combustion in amount when the wind-pressure sensor detects rise of the wind pressure of the air blowing in beyond a specified value of pressure. CONSTITUTION:At an exhaust pipe 4 is provided a wind-pressure sensor 15 which is designed to detect entry of wind in the direction in which the discharge of exhaust gas is obstructed. A fan 18 and a fan motor 19 for driving it are provided, constituting a blower assembly 5. In a fuel feed system 6 are provided a nozzle 20 and a solenoid valve 21 and a proportional valve 22 between the two. The wind-pressure sensor 15 is connected to a control box 23 which acts as a control means 7. The wind-pressure sensor 15 transmits the value of wind pressure of the air entering the exhaust pipe 4 to the control box 23, which then operates the comparison of the quantity of the fuel feed with the preliminarily set quantity of air for combustion of with the feeding pressure. The control box 23 controls the fan motor 19 and the proportional valve 22 in such a manner as to cause the combustion to take place under an optimum condition.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention relates to a windproof device for a combustor, and in particular, in a combustor whose exhaust pipe is installed outdoors, it prevents outside air from entering the exhaust pipe. This invention relates to a windproof device for a combustor that improves combustion problems caused by this.

(Prior Art) Generally, a combustor that heats a heat medium such as refrigerant gas has a heat exchanger that heats the heat medium by passing combustion gas from a combustion chamber. An exhaust pipe is connected to the downstream side of this heat exchanger for exhausting the heat-exchanged combustion gas as exhaust gas.

On the other hand, the combustion chamber is provided with a fuel supply means for supplying fuel and a blower fan for supplying combustion air.

Therefore, when fuel is supplied to the combustion chamber and combustion air is supplied by the blower fan, the fuel burns and becomes combustion gas, which flows from the combustion chamber to the heat exchanger. The heat medium is heated by passing through the exchanger.

Furthermore, the combustion gas that has passed through the heat exchanger is exhausted to the outside through an exhaust pipe as exhaust gas.

By the way, when an exhaust pipe is installed outdoors and exhaust gas is exhausted outdoors, when there is a strong wind, that is, when the outside air is strong, the outside air enters the exhaust pipe and prevents the exhaust gas from being exhausted.
This will inhibit combustion.

For this reason, in this type of combustor, when there is wind, the wind pressure of outside air entering the exhaust pipe is assumed in advance, and the exhaust gas is supplied to the combustion chamber in such a way that it overcomes this and is exhausted. The blower fan is configured to be operated to increase the supply pressure of combustion air. In other words, even when there is no wind outdoors, a large amount of combustion air is supplied to the combustion chamber, thereby preventing combustion from deteriorating when there is wind.

(Problems to be Solved by the Invention) Conventionally, in a combustor in which an exhaust pipe is installed outdoors and a heat exchanger is provided between the combustion chamber and the exhaust pipe to heat a heat medium such as refrigerant gas, The engine was designed to send a large amount of combustion air into the combustion chamber, assuming that outside air would enter the exhaust pipe during windy conditions and prevent exhaust gas from being exhausted. Due to this, when there is no wind or steady state, combustion air is supplied excessively to the combustion chamber by the blower fan, and as a result, combustion gas flows into the exhaust pipe without sufficiently exchanging heat with the heat medium in the heat exchanger, and excessive combustion occurs. There is a problem in that the temperature of the combustion gas is lowered by the air, resulting in a reduction in so-called thermal efficiency.

In addition, when operating the combustor in a low combustion region, that is, when reducing the amount of fuel supplied to the combustion chamber for combustion, if excessive combustion air is supplied to overcome the external wind, the air ratio to fuel increases. This tends to cause incomplete combustion and an increase in CO.

Therefore, the present invention was devised to solve the problems in conventional combustors. The present invention optimizes the combustion amount by controlling the amount of combustion air and fuel supplied to the combustion chamber according to the presence or absence of outdoor wind where the exhaust pipe is installed, that is, the presence or absence of outside air that obstructs exhaust, and the outside air wind pressure. The purpose of the present invention is to provide a windproof device for a combustor that controls the heat efficiency to maximize thermal efficiency and achieves low-pollution combustion.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides a combustor having an outdoor exhaust pipe, which prevents exhaust gas from being exhausted from the exhaust pipe. A wind pressure sensor is provided to detect the intrusion of outside air in the direction, and a control means is provided to control the combustion amount of the combustor when the wind pressure sensor detects that the outside air wind pressure for both people exceeds a predetermined value. It is composed of

(Function) With the above configuration, the wind pressure sensor detects the outside air wind pressure entering the exhaust pipe, and only when the outside air wind pressure that can prevent exhaust is detected, the control means controls to increase the supply pressure of combustion air into the combustion chamber. The amount of combustion is controlled by ejecting exhaust gas from the exhaust pipe by overcoming the outside wind. Further, the control means controls the amount of fuel supplied in accordance with the fact that the amount of combustion air is reduced due to the obstruction of exhaust gas discharge due to the intrusion of outside air into the exhaust pipe, thereby achieving combustion commensurate with the air ratio. .

(Example) An example of the present invention will be described below in detail based on the accompanying drawings.

As shown in FIG. 1, a combustor 1 for heating a heat medium such as a refrigerant mainly includes a combustion chamber 2, a heat exchanger 3, an exhaust pipe 4, and a combustion chamber 2.
It is composed of a blower 5 for supplying combustion air to the engine, a fuel supply system 6, and a control means 7.

The combustion chamber 2 is provided with a mixing chamber 8 in which primary air as combustion air supplied from the blower 5 and fuel supplied from the fuel supply system 6 are mixed. The combustion chamber 2 is also provided with a primary flame hole 9 for injecting the flame from the mixing chamber 8, and a secondary flame hole 1 for guiding secondary air.
0 is set. The heat exchanger 3 is provided downstream of the combustion chamber 2 and is configured to allow combustion gas to pass therethrough. A baffle 11 is provided in the combustion gas passage of the heat exchanger 3. The heat exchanger 3 is also provided with a heat exchange pipe 12 for heating a heat medium through it.

The exhaust end of the exhaust pipe 4 is installed outdoors, and its exhaust port 13
is provided with an exhaust top 14.

Particularly in the present invention, the exhaust pipe 4 is provided with a wind pressure sensor 15 that detects the intrusion of outside air in a direction that prevents exhaust gas from being discharged from the exhaust pipe 4. Specifically, the wind pressure sensor 15 is connected to a wind pressure detection pipe 16 that is installed in the exhaust top 14 and is connected to a wind pressure detection pipe 16 that is installed to collect outside air that enters the exhaust pipe 4 in a direction that prevents it from being exhausted. The pressure switch 17 detects the wind pressure being applied. In particular, the wind pressure detection pipe 16 is configured to enter the exhaust top 14 into the exhaust pipe 4 and guide and extract outside air in a direction that prevents exhaustion.

The blower 5 is provided with a blower fan 18 and a fan motor 19 for driving the blower fan 18.

The fuel supply system 6 is provided with a nozzle 20 for injecting fuel into the mixing chamber 8, and is also provided with an electromagnetic valve 21 for turning on and off the supply of fuel. Further, a proportional valve 22 as a flow rate control valve is provided in the fuel supply system 6 between the nozzle 20 and the electromagnetic valve 2I. This proportional valve 22
is configured to be opened and closed controlled by control means 7, which will be described later.

The control means 7 is composed of a proportional valve 22 as the flow rate control valve and a control box 23 that controls the rotation of the fan motor 190 based on the signal obtained from the wind pressure sensor 15.

As shown in the figure, a control box 23 as a control means 7 is connected to the wind pressure sensor 15, and the control box 23 is connected to the exhaust pipe 4 from the wind pressure sensor 15.
The outside air wind pressure value entering the system is sent, and a preset combustion air amount or supply pressure is compared and calculated with the fuel supply amount.
The control means 7 is configured to control the fan motor 19 and the proportional valve 22 so as to obtain optimum combustion.

Next, the operation of this embodiment will be described.

If there is no wind outdoors where the exhaust pipe 4 is installed, or if outside air does not enter the exhaust pipe 4, the wind pressure sensor 15 will detect this and the blower 5 will supply fuel to the combustion chamber 2. Combustion air commensurate with the fuel supplied from the system 6 will be supplied, resulting in optimal combustion. In particular, when combustion is performed in a low combustion region, a small amount of fuel is supplied from the fuel supply system 6 to the combustion chamber 2, and combustion air is supplied at an appropriate I&air ratio to compensate for the reduced amount of fuel. will be supplied with
CO is not generated due to incomplete combustion, and the amount of combustion air commensurate with optimal combustion during so-called steady state is supplied to the combustor 1 including the combustion chamber 2, so the temperature of the combustion gas is reduced. Thermal efficiency can be increased as much as possible without causing problems.

Specifically, the control means 7 is its control box 23
The rotation value of the fan motor 19 and the opening value of the proportional valve 22 are input in advance in order to supply combustion air at the optimum air ratio to the fuel supplied in no wind or steady state. One fan motor is automatically controlled in accordance with the amount of fuel being increased or decreased according to the opening degree of the valve 22.

On the other hand, when there is a strong wind, outside air enters the exhaust pipe 4 and obstructs the exhaust from the wind pressure detection pipe 1 of the exhaust dog 14.
6 will be invaded. The outside air that enters the wind pressure detection pipe 16 is
7, the detected wind pressure value is sent to the control box 23 as the control means 7, and the fan motor 1 is controlled so that the combustion air value is set in advance.
9 and increases the rotation of the fan motor 19 to increase the supply amount or pressure of combustion air and increase the exhaust pressure to continue combustion.

In addition, during strong winds, the control box 23 controls one fan motor to increase the amount of combustion air, and the pressure of the exhaust gas does not rise by L above a preset value, causing combustion to flow into the combustion chamber 2. When the amount of air decreases, the amount of fuel supplied is reduced accordingly to achieve complete combustion.

[Effect of the invention] The present invention exhibits the following excellent effects.

(1) When there is wind, the exhaust pressure can be increased to resist the pressure of outside air entering the exhaust pipe, and combustibility can be maintained favorably.

C) During steady state, excessive supply of combustion air is eliminated, thereby increasing the heat exchange efficiency of the heat exchanger and achieving sufficient heat recovery.

(3) During steady state, combustibility in the low combustion region can be improved as much as possible.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing one embodiment of the present invention. In the figure, 1 is a combustor, 4 is an exhaust pipe, 15 is a wind pressure sensor, 7
is a control means.

Claims (1)

[Claims] 1. In a combustor having an outdoor exhaust pipe, a wind pressure sensor is provided to detect when outside air enters the exhaust pipe in a direction that prevents the exhaust gas from being discharged from the exhaust pipe, and the wind pressure sensor detects intruding outside air. A windproof device for a combustor, comprising a control means for controlling the amount of combustion in the combustor when it is detected that the wind pressure exceeds a predetermined value.