CN106594742A - System for heating and unfreezing winter dump pit of garbage incineration power plant - Google Patents

Abstract

The invention relates to a winter garbage pit heating and thawing system of a waste incineration power station, comprising a continuous sewage discharge expansion vessel, a regular sewage discharge expansion vessel, a sewage discharge cooling pool and a garbage pit; the continuous sewage discharge of the waste heat boiler is connected to the entrance of the continuous sewage discharge expansion vessel, and the continuous sewage discharge The drainage port of the expansion vessel and the regular sewage discharge of the waste heat boiler are connected to the entrance of the periodical sewage expansion vessel through pipelines, and the drainage at the outlet of the periodical sewage expansion vessel is divided into three branch pipes through a tee, respectively connected to the entrance of the sewage cooling pool and the discharge hall of the garbage pit Side, connected to the sewage cooling pool and garbage pit, all branch pipes are equipped with valves. The system of the invention effectively heats and thaws the low-temperature garbage entering the site, improves the fermentation effect of the garbage pit in winter, further increases the calorific value of the garbage entering the furnace, avoids inputting into an auxiliary combustion system, and greatly reduces the operating cost of the power station in winter.

Description

A heating and thawing system for waste pits in winter in waste incineration power plants

technical field

The invention belongs to the technical field of waste incineration power generation, and specifically relates to a winter garbage pit heating and thawing system of a waste incineration power station.

Background technique

After the garbage is transported into the waste incineration power plant, it needs to be put into the garbage pit for storage and fermentation for several days to increase the calorific value of the garbage entering the furnace. The essence of garbage fermentation is the process of improving domestic garbage by relying on the life activities of microorganisms. Therefore, the fermentation rate of garbage depends largely on the activity of microorganisms. Studies have shown that when the temperature of the garbage dump is 30-65°C, the mesophilic and high-temperature bacteria are active, and the fermentation process is faster. If the ambient temperature is low, the temperature of the garbage dump will also decrease, and the fermentation process will be slower.

Generally speaking, in spring, summer and autumn, the temperature in the garbage bin is higher, the garbage fermentation effect is better, the calorific value of the garbage entering the furnace is high, and the combustion in the furnace is stable. But in winter, especially in northern my country, the temperature of the garbage entering the site is very low, and the garbage freezes or even entrains ice and snow, which is extremely unfavorable to the fermentation process, and the calorific value of the garbage decreases under the same fermentation time. Usually, in this case, the fermentation time of garbage can only be extended, but the fermentation time is limited by the storage of the garbage pit, and finally it can only be put into the combustion system to burn low calorific value garbage, which greatly increases the operating cost and is not conducive to the control of secondary waste during the incineration process. Formation of oxins and other pollutants.

Contents of the invention

The purpose of the present invention is to provide a garbage pit heating system suitable for a garbage incineration power plant, so as to deal with the situation that the low temperature or even freezing of the garbage entering the plant in winter affects the garbage fermentation in the garbage pit.

The technical solution of the present invention is: a winter garbage pit heating and thawing system of a waste incineration power plant, including a continuous sewage discharge expansion vessel, a regular sewage discharge expansion vessel, a sewage discharge cooling pool and a garbage pit; the continuous sewage discharge of the waste heat boiler is connected to the continuous sewage discharge expansion vessel The inlet, the drainage port of the continuous sewage expansion vessel and the regular sewage discharge of the waste heat boiler are connected to the entrance of the periodic sewage expansion vessel through pipes, and the drainage of the regular sewage expansion vessel outlet is divided into three branch pipes through a tee, respectively connected to the entrance of the sewage cooling pool and the garbage pit On the side of the unloading hall, connected to the sewage cooling pool and garbage pit, all branch pipes are equipped with valves. When the temperature of the garbage pit is high in spring, summer, and autumn, the valve connected to the branch pipe of the sewage discharge cooling pool is opened, and the valve connected to the branch pipe of the garbage pit is closed, and the waste heat boiler is continuously discharged into the continuous sewage expansion vessel after depressurization and flash evaporation , its drainage is connected to the regular blowdown expansion vessel, and together with the regular blowdown of the waste heat boiler, it is depressurized and flashed. The valve connected to the branch pipe of the sewage cooling pool is closed, the valve connected to the branch pipe of the garbage pit is opened, and the regular sewage expansion container is connected to the side of the garbage pit discharge hall to heat and thaw the low-temperature garbage just poured into the pit.

The steam flashed out of the continuous blowdown expansion vessel is connected to the waste heat of the oxygen removal system for utilization, and the steam flashed out of the regular blowdown blowdown expansion vessel is emptied.

The beneficial effects of the present invention are: simple system, low design and implementation cost, reliable operation, low-grade waste heat in the domestic waste incineration power generation thermal system can be used to increase the local temperature of the waste pit on the side of the discharge hall, thereby effectively heating and thawing the waste The low-temperature garbage in the yard can improve the fermentation effect of the garbage pit in winter, thereby increasing the calorific value of the garbage entering the furnace, avoiding the use of auxiliary combustion systems, and greatly reducing the operating cost of the power station in winter.

Description of drawings

Fig. 1 is a schematic diagram of the system of the present invention.

detailed description

As shown in Fig. 1, a garbage pit heating system suitable for a garbage incineration power station according to the present invention includes a continuous blowdown expansion vessel, a periodic blowdown expansion vessel, a blowdown cooling pool and a waste pit. The continuous sewage discharge of the waste heat boiler is connected to the inlet of the continuous sewage expansion vessel 1, and the drainage port of the continuous sewage expansion vessel 1 and the regular sewage discharge of the waste heat boiler are connected to the entrance of the regular sewage expansion vessel 2 through pipes, and the outlet of the regular sewage expansion vessel 2 is drained through a tee , are respectively connected to the discharge hall side of the sewage cooling pool 3 entrance and the garbage pit 4, and are connected to the sewage cooling pool 3 and the branch pipe of the garbage pit 4 to set valves. When the temperature of the garbage pit is high in spring, summer and autumn, the valve connected to the branch pipe of the sewage discharge cooling pool is opened, and the valve connected to the 4 branch pipes of the garbage pit is closed, and the sewage expansion container is drained regularly and connected to the sewage discharge cooling pool 3; When the temperature of the garbage pit is low, the valve connected to the branch pipe of the sewage discharge and cooling pool is closed, and the valve connected to the 4th branch pipe of the garbage pit is opened, and the regular sewage expansion container is drained and connected to the side of the garbage pit 4 unloading hall for heating and thawing. Cryogenic garbage poured into the pit. In order to simplify the system and reduce costs, the drainage of the regular sewage expansion vessel 2 is connected to the garbage pit 4 in a self-flowing form. Therefore, the processing technology and layout of the connecting pipes, as well as the location of the inlet of the garbage pit 4, need to be hydraulically calculated according to the actual situation. optimization.

Claims (4)

1. A heating and thawing system for garbage pits in waste incineration power plants in winter, characterized in that it includes continuous blowdown expansion vessel, regular blowdown expansion vessel, blowdown cooling pool and garbage pit; the continuous blowdown of waste heat boiler is connected to the entrance of the continuous blowdown expansion vessel The drain port of the continuous sewage expansion vessel and the regular sewage discharge of the waste heat boiler are connected to the entrance of the regular sewage expansion vessel through pipes, and the outlet of the regular sewage expansion vessel is divided into three branch pipes through a tee, which are respectively connected to the entrance of the sewage cooling pool and the garbage pit. On the side of the unloading hall, it is connected to the sewage cooling pool and the garbage pit, and all branch pipes are equipped with valves. 2. The winter garbage pit heating and thawing system of a waste incineration power plant according to claim 1, characterized in that, when the temperature of the garbage pit is high in spring, summer and autumn, the valve connected to the branch pipe of the sewage cooling pool is opened, and the valve is connected to The valve at the branch pipe to the waste heat pit is closed, and after the continuous sewage discharge of the waste heat boiler is connected to the continuous sewage discharge expansion vessel for decompression and flash evaporation, its drainage is connected to the regular sewage discharge expansion vessel, which is depressurized and flashed together with the waste heat boiler’s regular sewage discharge. When the temperature of the hydrophobic environment is high, it is connected to the sewage cooling pool. 3. The winter garbage pit heating and thawing system of a waste incineration power plant according to claim 1, characterized in that, when the temperature of the garbage pit is low in winter, the valve connected to the branch pipe of the sewage discharge cooling pool is closed, and the valve connected to the branch pipe of the garbage pit is closed. The valve at the place is opened, and the regular sewage expansion container is drained and connected to the side of the garbage pit unloading hall, which is used to heat and thaw the low-temperature garbage that has just been poured into the pit. 4. The winter garbage pit heating and thawing system of a waste incineration power plant according to claim 1, characterized in that the steam that is flashed out of the continuous blowdown expansion vessel is connected to the deoxygenation system for waste heat utilization, and the periodic blowdown blowdown expansion vessel flash evaporation Evacuate the steam that comes out.