含盐高浓度有机废液流化床焚烧灰渣粘结特性研究
发布时间：2019-04-24 21:08
【摘要】：随着我国国民经济和城市化进程的发展,工业化进程不断加快,有机废液排放量增加,含盐高浓度有机废液的问题也愈发严重。含盐高浓度有机废液具有高COD含量、高盐含量的特点,如果未经处理直接排放会对环境造成严重污染。流化床焚烧处理含盐高浓度有机废液,因其特别的流体动力特性及结构,在燃烧含盐高浓度有机废液时具有明显优势。本文对含盐高浓度有机废液的排放和处理技术进行了全面的综述,针对某农药化工厂产生的含盐高浓度有机废液的性质,采用鼓泡流化床和循环流化床耦合的焚烧装置进行处理。对流化床焚烧处置装置进行冷态及高温布风板阻力实验,对温度修正方法进行检验,在高温段的计算值偏大于实际值。采用修正系数对温度修正方法进行修正能够很好解决这一问题。比较不同的修正方法,采用修正系数的温度修正公式能够准确在较高流化风温度时的料层高度进行计算,为排渣系统的稳定运行提供参考。本文针对在流化床焚烧处理含盐高浓度有机废液的过程中,排渣系统内灰渣在熔点温度以下时出现的粘结问题展开研究。随着焚烧实验的进行,含盐高浓度有机废液中的钠盐(主要为NaCl)结晶析出,床料中的含盐浓度不断增加,导致排渣系统内的灰渣逐渐发生粘结团聚,造成排渣系统堵塞。灰渣粘结是在多种作用力共同作用下的结果,含盐高浓度有机废液在灰渣粘结过程中起团聚剂的作用,促进灰渣发生粘结。通过实验模拟了碱金属盐在排渣系统中的粘结情况,利用灰渣粘结结块后对块状物的破碎压力来表征灰渣的粘结强度,破碎块状物所需的破碎压力越大,则灰渣的粘结强度越大。研究了碱金属组成、加热温度、含水量、床料种类及其占比等因素对灰渣粘结特性的影响。NaCl与Na_2SO_4的粘结特性受温度与含水量的影响规律相似,粘结特性相差不大;破碎压力随着含水量和加热温度的增加而增加;床料含盐浓度越大其破碎压力也越大,在CaCO_3床料中比SiO_2床料更容易粘结。
[Abstract]:With the development of national economy and urbanization process of our country, industrialization process is speeding up, the discharge of organic waste liquid is increasing, and the problem of high concentration organic waste liquid containing salt is becoming more and more serious. The organic wastewater with high concentration of salt has the characteristics of high content of COD and high content of salt. If it is discharged directly without treatment, it will cause serious pollution to the environment. Fluidized bed incineration treatment of high-concentration organic wastewater containing salt has obvious advantages in combustion of high-concentration organic waste liquid with salt due to its special hydrodynamic characteristics and structure. In this paper, the discharge and treatment technology of high-concentration organic wastewater containing salt are comprehensively reviewed, and the properties of high-concentration organic waste liquor with salt produced by a pesticide chemical plant are reviewed. A bubbling fluidized bed (BFB) and a circulating fluidized bed (CFB) coupled incinerator were used for treatment. The resistance tests of cold and high temperature air distribution plates in fluidized bed incineration disposal unit were carried out. The temperature correction method was tested and the calculated value was larger than the actual value in the high temperature section. Using the correction coefficient to modify the temperature correction method can solve this problem very well. Compared with different correction methods, the temperature correction formula of the correction coefficient can accurately calculate the bed height at higher fluidization air temperature, which provides a reference for the steady operation of the slag removal system. In the process of fluidized bed incineration treatment of high concentration organic waste liquid containing salt, the bond problem of ash slag in the slag discharge system under melting point temperature is studied. Along with the incineration experiment, the sodium salt (mainly NaCl) crystallized out in the high-concentration organic waste liquid with salt, and the salt concentration in the bed material increased constantly, which led to the bond and agglomeration of the ash in the slag discharge system and the blockage of the slag removal system. Lime-slag bonding is the result of the joint action of various forces. High-concentration organic waste liquid containing salt acts as aggregate agent in the process of lime-slag bonding, and promotes the bonding of ash-slag. The bond condition of alkali metal salt in slag removal system was simulated experimentally. The crushing pressure of ash slag after caking was used to characterize the bond strength of ash slag, and the larger the crushing pressure was, the more the crushing pressure was needed to break the lump material, and the bond strength of ash slag was characterized by the crushing pressure of ash slag after caking. The greater the bond strength of the slag, the greater the bond strength of the slag. The effects of alkali metal composition, heating temperature, water content, type of bed material and its ratio on bond properties of ash slag were studied. The bonding characteristics of Na_2SO_4 and NaCl were similar to those of water content and temperature, but there was no significant difference between them. The crushing pressure increases with the increase of water content and heating temperature, and the higher the salt concentration of the bed material is, the greater the crushing pressure is, which is easier to bond in the CaCO_3 bed material than in the SiO_2 bed material.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X703
本文编号：2464788
[Abstract]:With the development of national economy and urbanization process of our country, industrialization process is speeding up, the discharge of organic waste liquid is increasing, and the problem of high concentration organic waste liquid containing salt is becoming more and more serious. The organic wastewater with high concentration of salt has the characteristics of high content of COD and high content of salt. If it is discharged directly without treatment, it will cause serious pollution to the environment. Fluidized bed incineration treatment of high-concentration organic wastewater containing salt has obvious advantages in combustion of high-concentration organic waste liquid with salt due to its special hydrodynamic characteristics and structure. In this paper, the discharge and treatment technology of high-concentration organic wastewater containing salt are comprehensively reviewed, and the properties of high-concentration organic waste liquor with salt produced by a pesticide chemical plant are reviewed. A bubbling fluidized bed (BFB) and a circulating fluidized bed (CFB) coupled incinerator were used for treatment. The resistance tests of cold and high temperature air distribution plates in fluidized bed incineration disposal unit were carried out. The temperature correction method was tested and the calculated value was larger than the actual value in the high temperature section. Using the correction coefficient to modify the temperature correction method can solve this problem very well. Compared with different correction methods, the temperature correction formula of the correction coefficient can accurately calculate the bed height at higher fluidization air temperature, which provides a reference for the steady operation of the slag removal system. In the process of fluidized bed incineration treatment of high concentration organic waste liquid containing salt, the bond problem of ash slag in the slag discharge system under melting point temperature is studied. Along with the incineration experiment, the sodium salt (mainly NaCl) crystallized out in the high-concentration organic waste liquid with salt, and the salt concentration in the bed material increased constantly, which led to the bond and agglomeration of the ash in the slag discharge system and the blockage of the slag removal system. Lime-slag bonding is the result of the joint action of various forces. High-concentration organic waste liquid containing salt acts as aggregate agent in the process of lime-slag bonding, and promotes the bonding of ash-slag. The bond condition of alkali metal salt in slag removal system was simulated experimentally. The crushing pressure of ash slag after caking was used to characterize the bond strength of ash slag, and the larger the crushing pressure was, the more the crushing pressure was needed to break the lump material, and the bond strength of ash slag was characterized by the crushing pressure of ash slag after caking. The greater the bond strength of the slag, the greater the bond strength of the slag. The effects of alkali metal composition, heating temperature, water content, type of bed material and its ratio on bond properties of ash slag were studied. The bonding characteristics of Na_2SO_4 and NaCl were similar to those of water content and temperature, but there was no significant difference between them. The crushing pressure increases with the increase of water content and heating temperature, and the higher the salt concentration of the bed material is, the greater the crushing pressure is, which is easier to bond in the CaCO_3 bed material than in the SiO_2 bed material.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X703
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