CN106536688A - 用于将生物甲烷注入到天然气网络中的方法 - Google Patents
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Abstract
一种用于将生物甲烷注入到具有在X1与X2之间的值X的总热值的网络中的方法,该方法包括在将该生物甲烷注入到该具有值X的总热值的网络中之前将氮气注入到该生物甲烷网络中以便将该生物甲烷网络的该热值降低至在X1与X2之间的值,其中该氮气衍生自至少一个膜阶段的渗余物。
Description
本发明涉及一种用于将生物甲烷注入到L型天然气网络中的方法并且涉及其对应的设备。
沼气主要含有甲烷(CH4)和二氧化碳(CO2),而且还有水、氮气、硫化氢、氧气、以及其他有机化合物。
有必要开发沼气的各种升级以便响应于在全球和区域水平二者范围内的由全球变暖所引起的问题,并且还以便增加产生该沼气的区域的能量独立性。
沼气可以,在轻微的处理之后,在生产场所附近进行升级以便提供热量、电力或两者的混合物(共同产生);高含量的二氧化碳降低了其热值,增加了压缩和运输成本并且将升级它的经济优点限制于此局部使用。
沼气的更彻底的纯化能够使其用途更广泛。
具体地,沼气的更彻底的纯化使得有可能获得被纯化至天然气规格的沼气;这种高度纯化的沼气被称为“生物甲烷”。因此,生物甲烷向天然气资源补充在区域的中心处生产的可再生部分。它可以用于完全相同的用途。
生产的生物甲烷的注入是受欢迎的。然而,在法国例如两种类型的天然气网络存在:H型(高热值)网络和L型(低热值)网络。沼气纯化单元产生主要含有在CH4中2.5mol%CO2的生物甲烷,因此具有对于被注入L型网络来说太高的总热值和沃泊指数(Wobbe index)。
因此,面临的一个问题是提供一种用于将生物甲烷注入到天然气网络中的改进的方法。
本发明的一种解决方案是一种用于将生物甲烷注入到具有在X1与X2之间的值X的总热值的网络中的方法,该方法包括在将该生物甲烷注入到该具有值X的总热值的网络中之前将氮气注入到生物甲烷网络中以便将该生物甲烷网络的热值降低至在X1与X2之间的值,其中该氮气由至少一个膜阶段的渗余物产生。
本发明的一种具体解决方案是一种用于将生物甲烷注入到L型天然气网络中的方法,该方法包括在将该生物甲烷注入到该天然气网络中之前将氮气注入到生物甲烷网络中以便将该生物甲烷网络的总热值降低至在9.5与10.5kWh/Nm3之间的值,其中该氮气由至少一个膜的渗余物产生。
视情况而定,根据本发明的方法可具有以下特征中的一个或多个:
-该膜阶段被供应有空气,该空气由该方法的内部网络产生或由空气压缩机产生;并且经由位于该膜阶段的进料上的控制阀或经由调节该空气压缩机的生产能力控制注入该生物甲烷网络中的氮气的量。在其中使用控制阀的情况下,已知天然气中甲烷的含量以及还有其流速(这两个参数使得有可能推导出当CH4是存在的唯一的燃料时该气体的GCV)计算待注入的氮气的流速的设定值。“内部网络”优选地应理解为是指用于操作该方法中所使用的仪器如阀的空气;还可以提及“仪器空气”;
-穿过该膜阶段的气体流是以下空气:该空气被干燥这样使得与生物甲烷混合的氮气(该膜阶段的渗余物)满足具有值X的总热值的网络的规格;并且该空气在大于或等于该生物甲烷网络的压力的压力(一般在5与15巴之间)下被脱油。总体上,该空气被干燥以便在注入网络的最大压力下具有低于-5℃的露点;
-经由分析该氮气渗余物中的氧气的浓度、或通过测量该渗余物的压力控制注入该生物甲烷网络中的氮气的纯度。为此,优选地使用控制回路,该控制回路的致动器是安装在该膜的渗余物上的控制阀,其中该控制阀使得有可能调节该膜的操作压力。位于该氮气渗余物上的氧分析仪使得有可能控制纯度并且构成该控制回路的测量。氧纯度也可通过测量渗余物的压力来推断。该控制回路的测量然后由压力传感器构成;
-从其得到富含氮气的渗余物的膜还产生富含氧气的流;
-将该富含氧气的流注入产生沼气的消化器中或沼气纯化单元的活性炭过滤器的上游。“消化器”应理解为是指沼气的厌氧生产。这种富含氧气的流的注入促进了实际上在消化器内的沼气的脱硫,或当该富含氧气的流被注入到沼气纯化单元中时它促进了通过活性炭的H2S的消除。
本发明的另一个主题是一种用于将生物甲烷注入到具有值X的总热值的网络中的设备,该设备包括:
-生物甲烷生产单元;
-生物甲烷网络;
-具有值X的总热值的网络;
-使得能够从空气流生产富含氮气的渗余物的氮气选择性膜;
-用于在大于或等于该生物甲烷网络的压力的压力下生产空气的系统;
-用于将该膜的渗余物注入到该生物甲烷网络中的第一注入装置;
-用于将由该生物甲烷网络产生的生物甲烷注入到该具有值X的总热值的网络中的第二注入装置,
其中根据该生物甲烷网络中的生物甲烷的流动方向该第二注入装置在该第一注入装置的下游。
根据本发明的一种具体设备是一种用于将生物甲烷注入到L型天然气网络中的设备,该设备包括:
-生物甲烷生产单元;
-生物甲烷网络;
-L型天然气网络;
-使得能够从空气流生产富含氮气的渗余物的氮气选择性膜;
-用于在大于或等于该生物甲烷网络的压力的压力下生产空气的系统;
-用于将该膜的渗余物注入到该生物甲烷网络中的第一注入装置;
-用于将由该生物甲烷网络产生的生物甲烷注入到该L型天然气网络中的第二注入装置,
其中根据该生物甲烷网络中的生物甲烷的流动方向该第二注入装置在该第一注入装置的下游。
视情况而定,根据本发明的设备可具有以下特征中的一个或多个:
-所述设备包括第一注入点上游的位于该膜的渗余物上的氧浓度分析仪、该第一注入装置上游的位于该膜的渗余物上的压力传感器以及该分析仪下游且该第一注入装置上游的位于该膜的渗余物上的控制阀;
-所述设备包括在该膜的进料流上的控制阀;
-用于产生压缩空气的系统依次地包括,在空气的流动方向上,空气入口、空气压缩机、压缩气体冷却系统、冷凝物分离器、使得有可能除去残余的油颗粒的活性碳过滤器、使得有可能除去这些活性炭颗粒的颗粒过滤器、干燥器和压缩空气储罐。
将使用图1、2和3更详细地描述本发明。
图1表示当用于生产氮气的空气取自仪器空气网络时根据本发明的设备。
图2表示当用于生产氮气的空气由专用的压缩机产生时根据本发明的设备。
在这两种情景下,空气流1供应由并联的一个或多个膜组成并且使得能够生产加压的氮气的膜阶段2。从该膜中回收富含氮气的渗余物3。取决于生物甲烷网络中容忍的氧气的量,生产更纯或较不纯的氮气。为了控制该氮气的此纯度,该渗余物进入测量氧浓度的分析仪4中并且经由控制阀5控制注入生物甲烷网络6中的氮气的纯度。所产生的氮气的流通过调节进入该膜阶段的空气的流速控制15,或者经由控制阀16(图1),或通过调节空气压缩机17的生产能力(图2);来自该生物甲烷的CH4的流量计以及还有分析仪使得有可能检查GCV符合注入规格。
图3描绘了空气生产系统可以是什么:空气可以在空气压缩机7中被压缩到大于5巴的压力,然后冷却8。在依次穿过包括活性炭的吸附器10以便消除残余油颗粒并且穿过颗粒过滤器11以便消除活性炭颗粒之前,如此压缩和冷却的空气流被引入冷凝物分离器9中。然后回收压缩和纯化的空气流,该空气流可以在供应膜2之前被存储12。
以下表1和2说明了从L气体网络中的GCV和沃泊指数观点来看对于注入氮气以便符合生物甲烷注入规格的需要:
生物甲烷组成 | 没有N2 | 具有N2 | |
N2 | %mol. | 0.0% | 6.0% |
O2 | %mol. | 0.0% | 0.0% |
CO2 | %mol. | 2.5% | 2.5% |
CH4 | %mol. | 97.5% | 91.5% |
总计 | 100.0% | 100.0% | |
GCV | kWh/Nm3 | 10.81 | 10.15 |
沃泊指数 | kWh/Nm3 | 14.22 | 13.06 |
表1
L气体GRT规格 | ||
最大GCV | kWh/Nm3 | 10.5 |
最大沃泊指数 | kWh/Nm3 | 13.06 |
表2
Claims (12)
1.一种用于将从生物甲烷网络产生的生物甲烷注入到具有在X1与X2之间的值X的总热值的网络中的方法,该方法包括在将该生物甲烷注入到该具有值X的总热值的网络中之前将氮气注入到该生物甲烷网络中以便将该生物甲烷网络的该热值降低至在X1与X2之间的值,其中该氮气由至少一个膜阶段的渗余物产生。
2.如权利要求1所述的用于注入生物甲烷的方法,其特征在于,该具有值X的总热值的网络是L型天然气网络并且X1=9.5kWh/Nm3且X2=10.5kWh/Nm3。
3.如权利要求1和2中任一项所述的方法,其特征在于:
-该膜阶段被供应有空气,该空气由该方法的内部网络产生或由空气压缩机产生;并且
-经由位于该膜阶段的进料上的控制阀或经由调节该空气压缩机的生产能力控制注入该生物甲烷网络中的氮气的量。
4.如权利要求1至3之一所述的方法,其特征在于,穿过该膜阶段的气体流是空气:
-该空气是经干燥的这样使得与该生物甲烷混合的为该膜阶段的渗余物的氮气满足该具有值X的总热值的网络的规格;并且
-该空气在大于或等于该生物甲烷网络的压力的压力下经脱油。
5.如权利要求3和4中任一项所述的方法,其特征在于,经由分析该氮气渗余物中的氧气的浓度、或通过测量该渗余物的压力控制注入该生物甲烷网络中的该氮气的纯度。
6.如权利要求3所述的方法,其特征在于,从其得到富含氮气的渗余物的膜还产生富含氧气的流。
7.如权利要求6所述的方法,其特征在于,将该富含氧气的流注入产生沼气的消化器中或沼气纯化单元的活性炭过滤器的上游。
8.一种用于将生物甲烷注入到具有值X的总热值的网络中的设备,该设备包括:
-使得有可能供应该生物甲烷网络的生物甲烷生产单元;
-生物甲烷网络;
-具有值X的总热值的网络;
-使得能够从空气流生产富含氮气的渗余物的氮气选择性膜;
-使得有可能供应该氮气选择性膜的用于在大于或等于该生物甲烷网络的压力的压力下生产空气的系统;
-用于将该膜的渗余物注入到该生物甲烷网络中的第一注入装置;
-用于将由该生物甲烷网络产生的生物甲烷注入到该具有值X的总热值的网络中的第二注入装置,
其中根据该生物甲烷网络中的生物甲烷的流动方向该第二注入装置在该第一注入装置的下游。
9.如权利要求8所述的设备,其特征在于,该具有值X的总热值的网络是L型天然气网络。
10.如权利要求8和9中任一项所述的设备,其特征在于,所述设备包括:
第一注入点上游的位于该膜的渗余物上的氧浓度分析仪,
该第一注入装置上游的位于该膜的渗余物上的压力传感器,以及
该分析仪下游且该第一注入装置上游的位于该膜的渗余物上的控制阀。
11.如权利要求10所述的设备,其特征在于,所述设备包括在该膜的进料流上的控制阀。
12.如权利要求8至11之一所述的设备,其特征在于,该用于生产压缩空气的系统依次地包括,在该空气的流动方向上:
-空气入口,
-空气压缩机,
-压缩气体冷却系统,
-冷凝物分离器,
-使得有可能除去残余的油颗粒的活性碳过滤器,
-使得有可能除去这些活性炭颗粒的颗粒过滤器,
-干燥器,
-压缩空气储罐。
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FR1454321 | 2014-05-15 | ||
FR1454321A FR3020966B1 (fr) | 2014-05-15 | 2014-05-15 | Procede d'injection de biomethane dans un reseau de gaz naturel |
PCT/FR2015/051230 WO2015173503A1 (fr) | 2014-05-15 | 2015-05-11 | Procédé d'injection de biomethane dans un réseau de gaz naturel |
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WO2015173503A1 (fr) | 2015-11-19 |
EP3143105A1 (fr) | 2017-03-22 |
US20170088785A1 (en) | 2017-03-30 |
FR3020966B1 (fr) | 2017-10-27 |
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