Synthesis of Low Calorific Value Anthracite Coal from Sewage Treatment Plant Sludge

Abstract

The synthesis of low calorific value anthracite from sewage treatment plant sludge is to add the special catalyst N737S for low calorific value anthracite from sludge to the wet organic sludge produced by the sewage treatment plant at a weight ratio of 100:0.5‑40, and then add it to the In the reaction kettle, control the temperature from 0-580 degrees for about 3-8 hours, add oxygen, nitrogen or mixed gas, and the pressure is 0.1 to ≤160MP. Through organic and inorganic reactions, the soluble and volatile organic C compounds in the sludge , converted into flammable fixed C compounds, the average treatment cost of wet mud is 30-80 yuan / t, the calorific value of the product can be controlled at 800-4500 kJ, and the existing thermal power plant circulating fluidized bed boiler is used for coal blending and incineration to generate electricity , After the tail gas is treated, no secondary pollutants are discharged beyond the standard, and the sludge treatment is made into low calorific value anthracite, which solves the worldwide problem of sludge pollution control and promotes the progress of the history of world civilization.

Description

1. Technical field [0001] The present invention relates to the fields of sludge pollution control, environmental protection and renewable energy utilization, the synthesis of low calorific value anthracite from sludge in sewage treatment plants, and the use of sludge to produce low calorific value anthracite incineration for power generation, heating and power supply, and specifically relates to the production of low calorific value of sludge in domestic sewage treatment plants Anthracite, industrial organic sludge and petrochemical organic sludge sludge treatment technology for low calorific value anthracite, synthesis of special catalyst for low calorific value anthracite from sludge (the special catalyst application unit is compiled as N737S). 2. Background technology [0002] Most of the sludge treatment methods in my country's urban domestic sewage treatment plants are to compress the sludge to a moisture content of 50%-70% for landfill treatment, and a small part is pro...

AI Technical Summary

Problems solved by technology

Today, the production and life of human beings who mainly use daily chemicals have undergone essential changes. Various new industrial enterprises and industrial products have sprung up. The production and living standards of human beings have been greatly improved, and cities with large populations Chemical agglomeration, petrochemical, pharmaceutical, pesticide, heavy metal processing, mining, daily chemical production, PAM and FCl in sludge 3 After use and then landfill or dry incineration, a large amount of heavy metals lead, chromium, cadmium, mercury, arsenic, and pm2.5 organic particle haze and dioxin emissions are produced, so that the pollutants in the sludge are no longer single, and urban domestic sewage The sludge of the treatment plant contains organic and inorganic substances and pathogenic bacteria, which are almost the "essence" of thousands of pollutants produced by human life. The physical and chemical components in the sludge are very complex. Due to random landfill or dumping of sludge Or the secondary pollution and the huge loss caused by using sludge as soil improver fertilizer is that, due to the incomplete treatment of sludge pollution, it is difficult to control the serious water pollution of rivers, lakes and seas

Therefore, the treatment of sewage and sludge pollution is the biggest issue related to China's future and future destiny. Sludge is a "product of sewage treatment plants", and the whole world has to find ways to treat sludge. Because sludge contains organic Carbon, which can generate heat and can be used for secondary use, first thought of drying sludge alone or mixed with coal for power generation. At present, sludge drying and incineration for power generation has encountered at least three unresolved problems: one is drying The moisture content of the sludge should be reduced to less than 30%, otherwise the incinerator will be damaged when the sludge is incinerated, because the water retaining agent PAM in the sludge is mixed with FCl 3 Medium Cl - The effect is that only by using high temperature and high pressure can the moisture content of sludge be dried to about 5%-15%, which is close to the moisture content of natural power coal. However, using high temperature and high pressure to dry sludge is costly and expensive. It may be universal, so most of the dried sludge in the market is naturally dried by solar energy or waste heat. Most of the dried sludge sold in the market has a moisture content of about 30%, which is neither suitable for ordinary low-temperature boilers nor applicable It is used in high-temperature fluidized bed incinerators. It is generally known that when dried sludge or dried sludge mixed with coal is incinerated in a low-temperature incinerator to generate electricity, because the incineration temperature is lower than 850°C, the fuel is not completely combusted, resulting in Organic pollutants and dioxin emissions, when the dried sludge with a moisture content of about 30% is mixed with natural steam coal for high-temperature incineration in a fluidized bed boiler for power generation, no matter whether the dried sludge is incinerated alone or mixed with natural steam coal Incineration, the water in the sludge is contained in the PAM, and together with the sludge, it will be bonded to the inner wall of the incinerator under the action of heat and cold. After a long time, the Cl - Under the action of mixing, it will corrode and burn down the incinerator, causing accidents and huge losses

However, no matter whether the sludge is dried and incinerated or mixed with municipal waste incineration or coal blended incineration after drying, whether it is dried sludge to make "fuel rods" instead of coal incineration in some departments, and blended into waste incineration plants for incineration to generate electricity, Regardless of high temperature or low temperature incineration, smog will run rampant. It is an indisputable fact that the huge discharge of heavy metals lead, chromium, cadmium, mercury, arsenic, nickel, and dioxins and Cl compounds has caused serious secondary pollution to the food chain of rivers, lakes, oceans, land, etc. Serious concern of the State Council and the Ministry of Environmental Protection

[0008] Now in order to alleviate the problem of secondary pollution from sludge, many local governments are carrying out sludge compression landfill or mixed garbage landfill. 3 The total cost of sludge treatment with a moisture content of 50% is about 180-200 yuan, and industrial sludge incineration will cost enterprises 3,600-4,000 yuan per m 3 , The cost of sludge pollution treatment is high, and many enterprises have closed their doors and stopped production. Sludge compression landfill needs to add concentrator PAM and dehydrating agent FeCl 3 , while producing high-concentration polluted sludge press filtrate discharge treatment, although this can alleviate the urgent need, it takes up a large amount of effective land area and wastes renewable energy resources