一、项目简要介绍

　　1、 Project Overview

　　本项目是由绿联净化承建的某化肥厂7台套欧洲某知名品牌燃气内燃发动机沼气向日葵网站下载入口色板尾气治理氮氧化物（NOx），经过处理的尾气需要满足当地大气污染物排放标准中对氮氧化物（NOx）的排放要求。

　　This project is undertaken by Green Union Purification for the treatment of nitrogen oxides (NOx) in the exhaust gas of 7 sets of well-known European brand gas internal combustion engine biogas generator sets in a fertilizer plant. The treated exhaust gas needs to meet the local air pollutant emission standards for NOx emissions.

　　二、该清洁能源电厂治理需求简述

　　2、 Brief description of the governance requirements for this clean energy power plant

　　1、项目名称：某化肥厂沼气清洁能源向日葵网站下载入口色板尾气NOx治理项目

　　1. Project Name: NOx Treatment Project for Exhaust Gas of a Biogas Clean Energy Generator Unit in a Fertilizer Plant

　　2、项目类型：某化肥厂沼气向日葵网站下载入口色板排放的尾气中NOx治理工程

　　2. Project type: NOx treatment project for exhaust emissions from a biogas generator set in a certain fertilizer plant

　　3、发动机品牌：欧洲某知名燃气内燃发动机

　　3. Engine brand: A well-known European gas internal combustion engine

　　4、向日葵网站下载入口色板品牌：国内某知名向日葵网站下载入口色板制造商

　　4. Generator set brand: a well-known domestic generator set manufacturer

　　5、数量：7台套

　　5. Quantity: 7 sets

　　6、输出功率：1169kW

　　6. Output power: 1169kW

　　三、项目背景和排放标准

　　3、 Project background and emission standards

　　某省区域性《大气污染物综合排放标准》 (DB37-2013)

　　Regional Comprehensive Emission Standards for Air Pollutants (DB37-2013) in a certain province

　　标准中要求“自2017年1月1日起，新建企业按所在控制区应分别执行表2中“重点控制区”和“一般控制区”的排放浓度限值，部分行业还应按所在控制区从严执行表3中相应的排放浓度限值。”

　　The standard requires that from January 1, 2017, newly established enterprises should implement the emission concentration limits for "key control areas" and "general control areas" in Table 2 according to their respective control areas. Some industries should also strictly implement the corresponding emission concentration limits in Table 3 according to their respective control areas. ”

　　本项目最终按照“重点控制区NOx<100mg/m3”的标准执行。

　　This project will ultimately be executed according to the standard of 'NOx<100mg/m3 in key control areas'.

　　四、此项目难点

　　4、 Difficulties in this project

　　4.1、硫化物影响：

　　4.1 Effects of Sulfides:

　　沼气成分复杂，前端脱硫系统的稳定性直接影响SCR系统效率和使用寿命，进入SCR系统的尾气中硫化物超标会造成催化剂中毒失效；

　　The composition of biogas is complex, and the stability of the front-end desulfurization system directly affects the efficiency and service life of the SCR system. Excessive sulfide in the exhaust entering the SCR system can cause catalyst poisoning and failure;

　　4.2、硅氧烷影响：

　　4.2. Effects of Siloxanes:

　　沼气中含有硅氧烷成分在发动机气缸中燃烧时高温而附着在发动机活塞气门组建上对发动机造成重要损坏，同时，硅氧烷在温度下降时会附着在SCR系统催化剂上，从而导致系统NOx处理效率下降；

　　The presence of siloxane components in biogas during combustion in engine cylinders can cause significant damage to the engine piston and valve assembly due to high temperatures. At the same time, siloxane can adhere to the SCR system catalyst when the temperature drops, leading to a decrease in the NOx treatment efficiency of the system;

　　4.3、尾气排温高：

　　4.3. High exhaust temperature:

　　中温SCR催化剂兼顾了可靠性、处理效率和经济性，中温催化剂理想工作温度在260-400℃，实际工况往往沼气内燃发动机尾气排温都超过这个温度。理想的方式是经过合理的降温再进入SCR反应器，但这样会造成热损失致使后端余热锅炉或者溴化锂空调装置能源转化效率降低，在实际工作场景中往往得不到投资方支持。而采用高温催化剂价格昂贵，同时因为对硫化物等气体成分敏感而性能不稳定，使用寿命不能保障。到目前为止国内还没有高温分子筛催化剂使用寿命超过24000小时的应用案例，极少数国外厂商也不能保证高温催化剂的使用寿命，如此种种不确定性无疑给商业电站造成不仅投资高昂，而且后期综合运营成本也高昂并且不可控等；

　　The medium temperature SCR catalyst balances reliability, treatment efficiency, and economy. The ideal working temperature for the medium temperature catalyst is between 260-400 ℃, but in actual operating conditions, the exhaust temperature of biogas internal combustion engines often exceeds this temperature. The ideal way is to enter the SCR reactor after reasonable cooling, but this will cause heat loss and reduce the energy conversion efficiency of the back-end waste heat boiler or lithium bromide air conditioning unit, which often does not receive support from investors in practical work scenarioses. However, the use of high-temperature catalysts is expensive, and their performance is unstable due to sensitivity to gas components such as sulfides, which cannot guarantee their service life. So far, there have been no application cases in China where the service life of high-temperature molecular sieve catalysts exceeds 24000 hours, and a very small number of foreign manufacturers cannot guarantee the service life of high-temperature catalysts. Such uncertainties undoubtedly cause not only high investment for commercial power plants, but also high and uncontrollable comprehensive operating costs in the later stage;

　　4.4、综合经济性：

　　4.4 Comprehensive Economy:

　　目前以沼气等为主要燃料的内燃发电站基本由企业出资承建，运行时需要一定的经济收益确保项目投入产出符合预期。而在实际的SCR系统选型招标采购时，由于这个产业刚刚兴起，全球范围内优质的供应商极少，注重品质的采购单位往往以进口燃气发动机性能优良为评价标准而顺延选择进口的SCR系统供应商。具体甄选时，需注意以下三个方面：

　　At present, internal combustion power plants that mainly use biogas and other fuels are mostly funded and constructed by enterprises, and a certain economic benefit is required to ensure that the project's input and output meet expectations during operation. In the actual bidding and procurement of SCR system selection, as this industry is just emerging, there are very few high-quality suppliers worldwide. Purchasing units that focus on quality often choose imported SCR system suppliers based on the excellent performance of imported gas engines as the evalsuation criteria. When selecting, attention should be paid to the following three aspects:

　　第一方面，国内领先的SCR系统供应商与国外相当。根据近两年的浸泡式深入研究后，需要特别提醒的是，在燃气内燃机脱硝领域国内与国外除开高温催化剂领域有差距之外，系统开发上几乎处于同等水平，主要技术来自于汽车SCR技术与火电厂脱硝技术的融合并基于燃气内燃发动机特性进行创新，已经取得了突破性成绩并做了很好的商业应用。目前国内领先的大功率内燃机SCR系统供应商如同互联网产业一样国内外难分伯仲；

　　Firstly, the leading SCR system suppliers in China are comparable to those abroad. After in-depth research on immersion type in the past two years, it should be noted that in the field of denitrification of gas internal combustion engines, there is a gap between China and foreign countries except for the field of high-temperature catalysts. The system development is almost at the same level, and the main technology comes from the integration of automotive SCR technology and thermal power plant denitrification technology, and innovation based on the characteristics of gas internal combustion engines has achieved breakthrough results and made good commercial applications. At present, the leading domestic supplier of high-power internal combustion engine SCR system is like the Internet industry;

　　第二方面是，国内外厂商在全程服务上有差异。SCR系统不同于燃气内燃向日葵网站下载入口色板，并非标准产品。每一个项目需要根据目标发动机排温、燃气成分、工作环境、治理目标、以及实际工作场景等等进行个性化定制方案，在这个总市场需求并不大的领域要求国外供应商提供及时快捷的售前服务目前还没有出现。极少数国外代理商只停留在卖产品的层面，不是不想提供服务，而是没有合适的人力资源和足够收益支撑。

　　The second aspect is that there are differences between domestic and foreign manufacturers in terms of full-service. The SCR system is different from gas internal combustion generator sets and is not a standard product. Each project requires personalized customized solutions based on target engine exhaust temperature, gas composition, working environment, governance goals, and actual work scenarioses. In this field where the overall market demand is not high, foreign suppliers are required to provide timely and efficient pre-sales services, which has not yet emerged. A very small number of foreign agents only stay at the level of selling products, not because they do not want to provide services, but because they do not have suitable human resources and sufficient revenue support.

　　第三方面，定制开发和运行成本上的差异。SCR系统的经济性由目标燃气气体成分和尾气温度、催化剂性能和价格、反应器封装结构和材料工艺、混合管设计制造合理性、控制喷射系统精确度、反应流场是否合理科学、前期项目方案定制开发和后期长远应急服务等等核心要素组成，国内外同时具备这些要素于一身的供应商少之又少。行业发展之初，劣币驱除良币。内燃机SCR系统属于新生事物，设计方、招标方、投资方、监理方、使用方等相关板块都缺乏专业选型考核标准，一部分投资方存在应付验收的验收后期搁置不用的侥幸心理，从而在实际采购过程中并不容易甄选到综合能力均衡的供应商。一个重要表现是，供应商抓住采购方既要达标又要低价的心理，低价中标并盲目承诺系统处理指标排放达标，而在项目实施过程中排放不达标无法验收，造成整个项目不能获得合法运行批文而损失巨大的心理胁迫采购单位加价的情形屡次出现。还有一种情况是，即使暂时排放达标，但是由于催化剂的使用寿命短和整套系统设计欠合理，控制系统不够精准，催化剂更换费用和尿素消耗量巨大，造成经济性大大下降，同时氨排放也超标，造成了新的污染。

　　The third aspect is the difference in customized development and operating costs. The economy of SCR system is composed of core elements such as target gas composition and exhaust temperature, catalyst performance and price, reactor packaging structure and material process, rationality of mixing tube design and manufacturing, precision of control injection system, rationality and scientificity of reaction flow field, customized development of early-stage project plan, and long-term emergency service in the later stage. There are very few suppliers at home and abroad who possess all these elements simultaneously. At the beginning of industry development, bad money drives out good money. The SCR system for internal combustion engines is a new phenomenon, and there is a lack of professional selection and assessment standards for the design, bidding, investment, supervision, and user sectors. Some investors have a lucky mentality of waiting for acceptance in the later stage, making it difficult to select suppliers with balanced comprehensive capabilities in the actual procurement process. An important manifestation is that suppliers seize the mentality of the purchaser to both meet standards and offer low prices, winning bids at low prices and blindly promising to meet the emission standards of the system. However, during the implementation of the project, if the emissions do not meet the standards, they cannot be accepted, resulting in the inability to obtain legal operating permits for the entire project and causing huge losses. The situation of psychological coercion to the procurement unit to increase prices has repeatedly occurred. There is also a situation where even if the emissions temporarily meet the standards, due to the short service life of the catalyst and the unreasonable design of the entire system, the control system is not precise enough, the cost of catalyst replacement and urea consumption are huge, resulting in a significant decrease in economy. At the same time, ammonia emissions also exceed the standard, causing new pollution.

　　本项目经测算，尿素消耗不超过0.006元/kWh。

　　According to calculations, the urea consumption of this project does not exceed 0.006 yuan/kWh.

　　五、绿联净化解决方案

　　5、 Green Union Purification Solution

　　1、技术方案：SCR+ASC，整体设计原理布局如下：

　　1. Technical solution: SCR+ASC, the overall design principle layout is as follows:

　　本结构示意图为绿联净化原创，版权所有

　　This structural diagram is an original creation of Green Union Purification, all rights reserved

　　2、原理说明：

　　2. Principle explanation:

　　系统化学反应方程式示意图如下：

　　The schematic diagram of the system chemical reaction equation is as follows:

　　本结构示意图为绿联净化原创，版权所有

　　This structural diagram is an original creation of Green Union Purification, all rights reserved

　　3、尿素供给系统：

　　3. Urea supply system:

　　六、系统控制原理示意图

　　6、 Schematic diagram of system control principle

　　本结构示意图为绿联净化原创，版权所有

　　This structural diagram is an original creation of Green Union Purification, all rights reserved

　　本系统根据目标发动机治理需求，在混合管前端通过前NOx传感器、温度传感器采集尾气参数及功率大小等一并传输给PLC系统控制尿素喷射量。在SCR反应器出口端通过NOx传感器、温度传感器、氨逃逸传感器（可选）等采集处理后的NOx含量，出口温度和NH3浓度 （通过可选传感器实现）。在电控系统液晶控制显示屏上会实时显示出对应数据，也可以远机位的方式在中央控制室实时监测，不需要单独采购烟气分析仪分析处理后烟气成分。本系统经过扩展，处理系统各种数据还可自动同步到云端，通过PC和移动客户端可实时监测实际排放指标。

　　This system collects exhaust parameters and power levels through front NOx sensors and temperature sensors at the front end of the mixing pipe according to the target engine governance requirements, and transmits them to the PLC system to control the urea injection amount. Collect and process the NOx content, outlet temperature, and NH3 concentration at the outlet of the SCR reactor through NOx sensors, temperature sensors, ammonia escape sensors (optional), and other sensors. The corresponding data will be displayed in real-time on the LCD control screen of the electronic control system, and can also be monitored in real-time in the central control room through remote monitoring. There is no need to purchase a separate flue gas analyzer to analyze and process the composition of the flue gas. This system has been expanded and can automatically synchronize various data to the cloud. Real time monitoring of actual emission indicators can be achieved through PC and mobiles clients.

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