Development of an engine control system using city gas and biogas fuel mixture
Development of an engine control system using city gas and biogas fuel mixture
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DOI：
10.1016/j.apenergy.2012.06.013
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发表时间：
2013
期刊：
影响因子：
11.2
通讯作者：
Y. Yamasaki;Masanobu Kanno;Yoshitaka Suzuki;S. Kaneko
中科院分区：
文献类型：
--
作者：
Y. Yamasaki;Masanobu Kanno;Yoshitaka Suzuki;S. Kaneko
本文开发了一种能够在城市煤气13A和沼气的任意混合比例下稳定运行的燃气发动机系统。燃气发动机系统由火花点火燃气发动机、额外的燃油电动节气门和我们自己的控制算法组成。该发动机为3缸1.6升发动机，最初用于热电联产，并增加了燃油节流阀以应对不同的燃油成分。控制算法还设计了调整燃料和空气的比例，以在城市煤气13A、沼气和负荷的不同混合比例下获得更高的发电效率和更低的NOx排放。在开发控制器之前，在各种负载条件下研究了混合比对发电效率和氮氧化物排放的影响。实验结果总结如下：制定了混合燃料Wobbe指数的控制算法；该指标决定了目标燃油空气比。接下来，通过将控制算法应用于燃气发动机，在不同的燃料混合比和负载下进行运行测试。当沼气比例从20%变化到40%、从70%变化到40%时，5s内实现了发动机转速和排气O2浓度的目标。当负载也从9.4kW到0.5kW、0.5kW到9.4kW等速变化时，转速和排气O2浓度在20s内达到目标值。在两种瞬态工况下，发动机系统均满足NOx排放要求，结果表明，对传统燃气发动机进行简单的硬件改造以及我们独创的控制算法能够在城市燃气13A和沼气的任意混合比下实现发动机的稳定运行。
In this paper, a gas engine system capable of stable operation at any mix ratio of city gas 13A and biogas was developed. The gas engine system consists of a spark-ignition gas engine, an additional electric throttle valve for fuel and our own control algorithm. The engine is a 3-cylinder 1.6-l engine that was originally used for co-generation, and the fuel throttle valve was added to respond to different fuel compositions. The control algorithm was also designed to adjust the fuel and air ratio to attain a higher generation efficiency and lower NOx emission with different mix ratios of city gas 13A, biogas and load. Before developing the controller, the effect of the mix ratio on generation efficiency and NOx emission was investigated under various load conditions. The following summarizes the experimental results: a control algorithm using the Wobbe index for mixed fuels was formulated; this index determines the target fuel-to-air ratio. Next, operation tests were performed under varying fuel mix ratios and loads by applying the control algorithm to the gas engine. The target engine rotational speed and exhaust O2concentration was realized in 5s when the biogas fraction varied from 20% to 40% and from 70% to 40%. When the load was also varied from 9.4kW to 0.5kW and from 0.5kW to 9.4kW at a constant rate, the rotational speed and exhaust O2concentration achieved the target values in 20s. Under both transient operation conditions, the engine system met the NOx emission requirement, and the results indicate that the simple hardware modification to a conventional gas engine and our original control algorithm are capable of achieving stable engine operation at any mix ratio of city gas 13A and biogas.