CN1464581A - Fuel cell powered engine self-adaptive humidifying apparatus - Google Patents

Abstract

A self adapting humidifying equipment for fuel cell engine is primarily consisted of water tank, water level controller, solenoid valve, venturi and current limiting loop, in which the water level controller and the solenoid valve are connected with the water tank, while the current limiting loop is connected with the water tank and the venturi. The present invention utilizes the transformation relation between total pressure, kinetic pressure and static pressure of fluid body in the venturi, and controls humidification flow with pressure difference, in view of the relationship between the humidification quantity and airflow discharge is linear, thus ensures a constant specific humidity for humidified gas. The present invention provides a simple structure, and is easy to be used, maintained and repaired.

Description

Fuel cell powered engine self-adaptive humidifying apparatus

Technical field

The present invention relates to a kind of damping device,, under the variable working condition situation, can self adaptation regulate the device of humidification amount in particular for fuel battery engines.

Background technology

The hydrogen oxygen fuel cell engine technology is the technology of the free of contamination new forms of energy of environment-friendly type, current more international developed countries study this problem unexpectedly mutually, a lot of ins and outs all are in highly confidential state, though can find some documents and materials or retrieve some patent documentations, but the thinking that all belongs to technical development technical scheme in earlier stage, also do not find to relate to Preliminary design, detailed design promptly realizes the relevant document and the patent documentation of engineering system technical scheme and concrete engineering structure, can be seldom for the content of using for reference, for example from the patent documentation of finding, there are following several parts of data to relate to the content of Humidification problem, as:

1.Water?management?system?for?Solid?polymel?electrolyte?fuel?cell?power?plants，

Patent?Number：5,503,944，Apr，2，1996.

2.Self-Humidifying?Fuel?Cell，Patent?Number：US?6,207,312?B1，Mar，27，2001.

3.Appartue?for?humidifying?the?air?stream?of?a?full?cell?power?plant，Patent

Number：US?6,207.306，B1.Mar，27，2001.

4.Full?cell?coolen-humidfien?plate.Patent?Number：6,066,408.May，23，2001.

5.Process?and?appararus?for?humidifying?Process?gas?for?Operating?fuel?cell

system.Patent?Number：5,432,020.Jul，11，1995.

6.Fuel?cell?and?method?for?maintening?the?electrolyte?of?the?fuel?cell.Patent

Number：5,543,238.Aug，6，1996.

What above-mentioned patent documentation great majority were introduced is the method for interior humidification, adopts porous material to make pole plate, heats to reacting gas with the hot water behind the cooling pile, sees through some water simultaneously and comes the humidification reacting gas.And for example, adopting outer humidification system, is to give the reacting gas humidification behind compressor, carries out circuit control with clock.

If adopt above-mentioned control model, can make the self-adaptive regulating structure complexity of control humidification amount, be not suitable for being used among the research that we design voluntarily.Need us to study voluntarily and design from such background technology to satisfy the task of top priority.

Summary of the invention

According to background technology, the object of the present invention is to provide a kind ofly at fuel battery engines, can self adaptation under the variable working condition situation carry out flow control, be used for regulating the damping device of required humidification amount.

To achieve these goals, the present invention is achieved through the following technical solutions:

A kind of fuel cell powered engine self-adaptive humidifying apparatus, mainly by water tank (1), water level controller (11), electromagnetically operated valve (12), Venturi tube (2), current limliting circle (3) is formed, wherein: water level controller (11) is connected with water tank (1), electromagnetically operated valve (12) is connected with water tank (1) by pipeline (13), current limliting circle (3) one ends are connected with water tank (1) by flow-path tube (15), current limliting circle (3) other end is connected with the throat (21) of Venturi tube (2) by flow-path tube (15), and air inlet pipeline (14) is connected with Venturi tube (2) with water tank (1).

The humidification of this device promptly is to add water to reacting gas, making gas reach certain humidity (or makes gas reach certain humidity ratio, be the weight of the contained water of the gas of Unit Weight), what control added discharge to gas is current limliting circle 3, its operation principle is: when the pressure differential of Venturi tube one specified time stream circle 3 front and back only relevant with gas flow rate V by Venturi tube 2 throats 21, by Bai Nuli equation and continuous equation as can be known:

The pressure reduction of current limliting circle 3 front and back is: Δ P=P ₀-P ₁

Its humidification flow is: $g=\mathrm{\&mu;<figure-callout\; id="2"\; label="F"\; filenames="A0212408500061.png"\; state="\{\{state\}\}">F</figure-callout>}\sqrt{{2\mathrm{\&rho;}}_1\mathrm{\&Delta;P}}$

Again: Δ P=1/2 ρ V ²

So: $g=\mathrm{\&mu;F}\sqrt{{\mathrm{\&rho;}}_1}\&CenterDot;\mathrm{\&rho;V}/\sqrt{\mathrm{\&rho;}}$

In the formula: ρ ₁--the density of humidification water

The density of ρ--gas

μ--current limliting circle flow coefficient

F--current limliting circle flow area

Know that again the flowing velocity of air-flow can be thought incompressible flow in Mach number M＜0.4 o'clock, so ρ can be considered constant value, therefore, by above-mentioned humidification flow equation as can be known the humidification amount just only and F, ρ V is relevant.Adjust the flow area of current limliting circle and can adjust the desired humidity ratio of gas, in humidity ratio one regularly, the humidification amount can followed the variation of gas flow and adaptive linear change.

Owing to adopted technique scheme, the present invention to have following advantage and effect:

1, the present invention adopts Venturi tube, and its stream is simple, the foundation that the flow field is reliable and stable certain pressure field, make the humidification amount of the control device that it can be reliable and stable;

2, the size of the present invention's humidification amount under same operating mode gets final product adaptive humidification by the decision of current limliting circle in case Installation and Debugging finish;

3, the present invention is simple in structure, and cost is low, and is in light weight, and working service is repaired simple and easy.

Description of drawings

Fig. 1 is a general structure cross-sectional schematic of the present invention

Fig. 2 is a humidification block diagram of the present invention

Among the figure: the 1-water tank, the 11-water level controller, the 12-electromagnetically operated valve, the 13-pipeline, the 14-air inlet pipeline, the 15-flow-path tube, the 2-Venturi tube, 21-throat, 3-current limliting circle, a-air feed direction, b-gas adds the water outbound course, the c-direction of intaking

Embodiment

By shown in Figure 1, the present invention is mainly by water tank 1, water level controller 11, electromagnetically operated valve 12, Venturi tube 2, current limliting circle 3 is formed, wherein: water level controller 11 is connected with water tank 1, and electromagnetically operated valve 12 is connected with water tank 1 by pipeline 13, and current limliting circle 3 one ends are connected with water tank 1 by flow-path tube 15, current limliting circle 3 other ends are connected with the throat 21 of Venturi tube 2 by flow-path tube 15, and air inlet pipeline 14 is connected with Venturi tube 2 with water tank 1.

The present invention has adopted the transducing part of Venturi tube 2 as this device, can change the flow velocity V and the static pressure P at throat 21 places when the supply gas changes in flow rate ₁The change of value, flow velocity V and static pressure P ₁Currency as the heat transfer agent of gas self, also become control information simultaneously, promptly set up pressure difference Δ P with control in the front and back of current limliting circle 3, utilize this pressure difference Δ P to control the humidification flow, and the flow of this humidification amount and supply air flow is linear, and this has just been created the technical foundation of supply gas adaptively changing humidification amount by Venturi tube 2.The setting of Venturi tube 2 can't change the original flow parameter of supply gas, has only set up sensing and control information at throat 21 places.

After structure Installation and Debugging of the present invention test, determined after certain humidity ratio, humidification amount of the present invention will be along with the variation of gas flow adaptive linear change.

Water level controller 11 is used for controlling the designated water level in the water tank 1, and water level controller 11 has circuit to be connected with electromagnetically operated valve 12, by the Push And Release control water inlet of control electromagnetically operated valve 12.14 1 of air inlet pipelines link to each other as supply air line with Venturi tube 2, and another is connected with water tank 1, keep the stagnation pressure P in air feed and the water tank ₀Value is consistent.

Claims (1)

1, a kind of fuel cell powered engine self-adaptive humidifying apparatus, mainly by water tank (1), water level controller (11), electromagnetically operated valve (12), Venturi tube (2), current limliting circle (3) is formed, it is characterized in that: water level controller (11) is connected with water tank (1), electromagnetically operated valve (12) is connected with water tank (1) by pipeline (13), current limliting circle (3) one ends are connected with water tank (1) by flow-path tube (15), current limliting circle (3) other end is connected with the throat (21) of Venturi tube (2) by flow-path tube (15), and air inlet pipeline (14) is connected with Venturi tube (2) with water tank (1).

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