阅读说明：本技术 一种利用生物质蒸汽锅炉干化污泥并发电的循环利用系统 (Utilize cyclic utilization system of biomass steam boiler mummification mud and electricity generation ) 是由 李文辉 冯全义 贺贤亮 邢学科 于 2019-11-02 设计创作，主要内容包括：本发明属于资源利用技术领域,涉及一种利用生物质蒸汽锅炉干化污泥并发电的循环利用系统。该循环利用系统,包括依次连接的湿污泥储仓、污泥干化机、干污泥储仓、搅拌机、造粒机、生物质蒸汽锅炉、汽轮机和发电机,农林废弃物储仓与干污泥储仓连接。该循环利用系统,将干化污泥与农林废弃物制成生物质燃料并供生物质蒸汽锅炉燃烧,再将产生的饱和蒸汽用于汽轮机并进一步发电,使污泥得以资源化利用和无害化处理,绿色环保、运行成本低。(The invention belongs to the technical field of resource utilization, and relates to a recycling system for drying sludge and generating power by using a biomass steam boiler. The recycling system comprises a wet sludge storage bin, a sludge drying machine, a dry sludge storage bin, a stirrer, a granulator, a biomass steam boiler, a steam turbine and a generator which are sequentially connected, wherein the agricultural and forestry waste storage bin is connected with the dry sludge storage bin. The recycling system is used for preparing the dried sludge and agricultural and forestry wastes into biomass fuel for the combustion of a biomass steam boiler, and then using the generated saturated steam for a steam turbine to further generate electricity, so that the sludge can be recycled and subjected to harmless treatment, and the recycling system is green and environment-friendly and has low operation cost.)

1. A recycling system for drying sludge and generating power by using a biomass steam boiler is characterized by comprising an agricultural and forestry waste storage bin (1), a wet sludge storage bin (2), a sludge drying machine (3), a dry sludge storage bin (4), a stirrer (5), a granulator (6), a biomass steam boiler (7), a steam turbine (8) and a generator (9);

the discharge hole of the wet sludge storage bin (2) is connected with the feed hole of the sludge drier (3), the dry sludge outlet of the sludge drier (3) is connected with the feed hole of the dry sludge storage bin (4), the discharge hole of the dry sludge storage bin (4) is connected with the feed hole of the stirrer (5), the discharge hole of the stirrer (5) is connected with the feed hole of the granulator (6), the discharge hole of the granulator (6) is connected with the combustion chamber of the biomass steam boiler (7), the steam outlet of the biomass steam boiler (7) is connected with the steam inlet of the steam turbine (8), and the output shaft of the steam turbine (8) is connected with the input shaft of the generator (9);

the discharge hole of the agricultural and forestry waste storage bin (1) is connected with the feed inlet of the dry sludge storage bin (4).

2. The recycling system according to claim 1, wherein the steam exhaust outlet of the steam turbine (8) is connected with the steam inlet of the sludge drier (3), and the steam condensate outlet of the sludge drier (3) is connected with the water inlet of the biomass steam boiler (7).

3. The recycling system according to claim 1, further comprising a slag bin (10), an ash bin (11), a screw conveyor (12), and a brick making machine (13);

a material slag outlet of the biomass steam boiler (7) is connected with a feeding hole of the slag bin (10), and an ash outlet is connected with a feeding hole of the ash bin (11);

the discharge ports of the slag bin (10) and the ash bin (11) are respectively connected with the feed port of the brick making machine (13) through a screw conveyor (12).

4. The recycling system of claim 3, further comprising a cyclone (14), a spray scrubber (15), an activated carbon deodorizer (16), an induced draft fan (17) and a chimney (18) connected in sequence;

the flue gas outlet of the biomass steam boiler (7) is connected with the gas inlet of the cyclone dust collector (14), and the ash outlet of the cyclone dust collector (14) is connected with the feed inlet of the ash bin (11).

5. The recycling system according to claim 4, further comprising a cooler (19);

the wet waste gas outlet of the sludge drier (3) is connected with the gas inlet of a cooler (19), and the gas outlet of the cooler (19) is connected with the combustion chamber of a biomass steam boiler (7).

6. The recycling system according to claim 5, wherein the condensed water outlet of the cooler (19) is connected to the water inlet of the spray scrubber (15).

7. The recycling system according to claim 1, wherein the steam turbine (8) is a skid-mounted back pressure turbine.

8. The recycling system according to claim 1, wherein the sludge dryer (3) is a paddle type sludge dryer.

Technical Field

The invention belongs to the technical field of resource utilization, and relates to a recycling system for drying sludge and generating power by using a biomass steam boiler.

Background

Sludge is a solid precipitate produced during sewage treatment. The municipal sludge and the industrial sludge are mainly treated by landfill, but the method not only costs a large amount of capital and occupies a large amount of land resources, but also causes serious secondary pollution to the ecological environment.

In response to this, attempts have also been made to utilize sludge as a fertilizer for agriculture or greening; however, various heavy metals contained in the sludge can be enriched in the soil and enter a food chain through the absorption of crops, and the health of human bodies is finally harmed, so that the adaptability of the soil to the sludge utilization is limited; even if some sludge comes from urban domestic sewage and the heavy metal content is low, the odor emitted from the sludge seriously pollutes the environment, and pathogens, persistent organic pollutants and various agents added in the sewage treatment process pollute the ground surface and underground water systems and bring potential harm to the environment and human health. In addition, there is a method of reducing the amount of sludge by incineration, however, the method has a limitation in popularization and use due to problems such as high investment in sludge incineration facilities, large energy consumption, and high running cost.

The main reasons for the above phenomena are that domestic sludge treatment starts late, the basis of sludge utilization is weak, the utilization rate is low, many sewage treatment plants are directly stacked in outsides of the environmental sanitation department after being temporarily stored, and a proper sludge treatment method is not found; and secondary pollution is easily caused by random stacking of the sludge, so that the sludge resource is seriously wasted.

In the face of the fact that the environmental problems caused by sludge are becoming acute and the sludge harm is becoming more serious, domestic industrial sludge and municipal sludge need to be subjected to harmless treatment and resource utilization, and a new circular economy way for comprehensive utilization of sludge is developed.

Disclosure of Invention

The invention aims to provide a recycling system for drying sludge and generating power by using a biomass steam boiler, which effectively recycles and utilizes wet sludge through harmless treatment, so that resources are recycled, and the recycling system is green and environment-friendly.

The technical scheme of the invention for solving the technical problems is as follows.

A recycling system for drying sludge and generating power by using a biomass steam boiler comprises an agricultural and forestry waste storage bin, a wet sludge storage bin, a sludge drying machine, a dry sludge storage bin, a stirrer, a granulator, a biomass steam boiler, a steam turbine and a generator; the discharge hole of the wet sludge storage bin is connected with the feed inlet of the sludge drier, the dry sludge outlet of the sludge drier is connected with the feed inlet of the dry sludge storage bin, the discharge hole of the dry sludge storage bin is connected with the feed inlet of the stirrer, the discharge hole of the stirrer is connected with the feed inlet of the granulator, the discharge hole of the granulator is connected with the combustion chamber of a biomass steam boiler, the steam outlet of the biomass steam boiler is connected with the steam inlet of a steam turbine, and the output shaft of the steam turbine is connected with the input shaft of a generator; the discharge hole of the agricultural and forestry waste storage bin is connected with the feed inlet of the dry sludge storage bin. According to the technical scheme, the dry sludge obtained through drying treatment and agricultural and forestry waste are used as raw materials, the dry sludge and the agricultural and forestry waste are granulated to be biomass fuel and used for combustion of a biomass steam boiler, the generated steam is used for driving a steam turbine to rotate, mechanical energy generated by the steam turbine is further converted into electric energy through a generator, and harmless treatment of wet sludge and the agricultural and forestry waste is achieved.

Furthermore, a steam exhaust outlet of the steam turbine is connected with a steam inlet of the sludge drying machine, and a steam condensate outlet of the sludge drying machine is connected with a water inlet of the biomass steam boiler. The waste steam generated by the steam turbine is recycled for the drier, and the condensed water of the drier is recycled for the biomass steam boiler, so that the water resource is recycled, and the wastewater discharge is reduced.

Further, the recycling system also comprises a slag bin, an ash bin, a screw conveyor and a brick making machine; a material slag outlet of the biomass steam boiler is connected with a feed inlet of the slag bin, and an ash outlet is connected with a feed inlet of the ash bin;

the discharge ports of the slag bin and the ash bin are respectively connected with the feed port of the brick making machine through a screw conveyer. The slag and ash generated when the biomass steam boiler is used are collected and used for making bricks, so that the waste generated by the biomass steam boiler can be recycled, and the resource waste is reduced.

Furthermore, the recycling system also comprises a cyclone dust collector, a spray washing tower, an active carbon deodorizer, an induced draft fan and a chimney which are connected in sequence; the smoke outlet of the biomass steam boiler is connected with the air inlet of the cyclone dust collector, and the ash outlet of the cyclone dust collector is connected with the feed inlet of the ash bin. Through setting up a set of dust removal deodorization system, make biomass steam boiler produce the flue gas can handle and discharge after reaching standard, the ash content of production can be retrieved and recycled.

Further, the recycling system also comprises a cooler; the wet waste gas outlet of the sludge drier is connected with the gas inlet of the cooler, and the gas outlet of the cooler is connected with the combustion chamber of the biomass steam boiler. By arranging the cooler, the waste gas generated by the drier is effectively recycled and is used for the combustion of the biomass steam boiler in an auxiliary manner.

Further, a condensed water outlet of the cooler is connected with a water inlet of the spray washing tower. Through setting up the relation of being connected between cooler and the spray scrubber, be used for the spray scrubber's of the condensate water that produces among the wet waste gas condensation process to spray the process, further make water resource cyclic utilization, reduce waste water discharge.

Further, the steam turbine is a skid-mounted back pressure steam turbine; further, the sludge drier is a paddle type sludge drier.

The recycling system for drying sludge and generating power by using the biomass steam boiler has the beneficial effects that firstly, biomass fuel is combusted by the biomass steam boiler to generate steam, and the steam enters the sludge drying machine to dry wet sludge; the dried sludge is mixed with agricultural and forestry wastes to prepare biomass granular fuel, so that waste is changed into valuable, and the biomass granular fuel is supplied to a biomass steam boiler for combustion; the generated saturated steam acts on a steam turbine to generate power, and the exhaust steam after power generation is used as a heat source for drying wet sludge; ash slag generated after the biomass boiler is combusted is used for manufacturing road bricks, so that harmful sludge can be recycled and subjected to harmless treatment; the cooler is used for further recycling waste gas generated in the drying process, and meanwhile, smoke generated in the biomass steam boiler is purified and discharged into the atmosphere after reaching the standard, so that no pollution gas is discharged; the system has the advantages of efficient cyclic utilization of resources, environmental protection, low operation cost, obvious economic benefit and social benefit and worth of market popularization.

Drawings

FIG. 1 is a schematic structural diagram of a recycling system for drying sludge and generating electricity by using a biomass steam boiler according to the present invention.

The codes in the figures are respectively: the system comprises an agricultural and forestry waste storage bin 1, a wet sludge storage bin 2, a sludge drier 3, a dry sludge storage bin 4, a stirrer 5, a granulator 6, a biomass steam boiler 7, a steam turbine 8, a generator 9, a slag bin 10, an ash bin 11, a screw conveyor 12, a brick making machine 13, a cyclone dust collector 14, a spray washing tower 15, an active carbon deodorizer 16, an induced draft fan 17, a chimney 18, a cooler 19, a wet sludge conveying pipeline 20, a sludge conveying pump 21, a granular fuel field 22 and an automatic feeder 23;

Detailed Description

As shown in fig. 1, a recycling system for drying sludge and generating power by using a biomass steam boiler comprises an agricultural and forestry waste storage bin 1, a wet sludge storage bin 2, a sludge drying machine 3, a dry sludge storage bin 4, a stirrer 5, a granulator 6, a biomass steam boiler 7, a steam turbine 8, a generator 9, a slag bin 10, an ash bin 11, a screw conveyor 12, a brick making machine 13, a cyclone dust collector 14, a spray washing tower 15, an activated carbon deodorizer 16, an induced draft fan 17, a chimney 18, a cooler 19, a wet sludge conveying pipeline 20, a sludge conveying pump 21, a granular fuel field 22 and an automatic feeder 23; wherein, the steam turbine 8 is a skid-mounted back pressure steam turbine, and the sludge drier 3 is a paddle sludge drier.

The wet sludge storage bin 2 is a closed bin and stores wet sludge containing municipal sludge and industrial sludge, and the agriculture and forestry waste storage bin 1 stores crushed agriculture and forestry and cultivation wastes such as grass, branches, straws, cow dung, sheep dung and the like.

A discharge port of the wet sludge storage bin 2 is connected with a feed port of the sludge drier 3 through a wet sludge conveying pipeline 20, and wet sludge is conveyed into the sludge drier 3 under the drive of a sludge conveying pump 21; a dry sludge outlet of the sludge drier 3 is connected with a feed inlet of a dry sludge storage bin 4, so that dry sludge (with water content of about 25%) obtained after drying treatment by the sludge drier 3 enters the dry sludge storage bin 4 for standby, and meanwhile, a discharge outlet of the forestry and agricultural residues storage bin 1 is also connected with the feed inlet of the dry sludge storage bin 4, so that the forestry and agricultural residues stored in the forestry and agricultural residues storage bin 1 are also conveyed into the dry sludge storage bin 4 for standby; a discharge hole of the dry sludge storage bin 4 is connected with a feed hole of the stirrer 5 and is used for stirring and fully mixing the dry sludge and the agricultural and forestry wastes; the discharge port of the stirrer 5 is connected with the feed port of the granulator 6, so that dry sludge and agricultural and forestry wastes are granulated under the action of the granulator 6 to generate biomass fuel particles, the heat value of the biomass fuel particles is about 2800 kilocalories/kilogram, and meanwhile, the discharge port of the granulator 6 can be connected with a particle fuel field 22, so that the biomass particle fuel is temporarily stored in the particle fuel field 22 and is conveyed to a combustion chamber of a biomass steam boiler 7 through an automatic feeder 23 to supply heat for combustion of the boiler; the steam outlet of the biomass steam boiler 7 is connected with the steam inlet of the steam turbine 8, so that low-pressure saturated steam generated by the biomass steam boiler 7 is used for the skid-mounted back pressure steam turbine to do work, meanwhile, the generator 9 is driven to rotate in a mode that the output shaft of the steam turbine 8 is connected with the input shaft of the generator 9, and therefore power resources are generated, and can be used in the system or sent to a power grid for use.

The exhaust steam outlet of the steam turbine 8 is connected with the steam inlet of the sludge drier 3, so that the exhaust steam which is acted by the steam turbine 8 is sent into the sludge drier 3 through the exhaust steam outlet and is used as a supplementary heat source for drying wet sludge; the steam condensate outlet of the sludge drier 3 is connected with the water inlet of the biomass steam boiler 7, so that the condensate generated after the wet sludge is dried by the exhaust steam entering the sludge drier 3 passes through the steam condensate outlet of the sludge drier 3 and is connected with the water inlet of the biomass steam boiler 7 and is recycled to the water supply system of the biomass steam boiler 7.

A material slag outlet of the biomass steam boiler 7 is connected with a feeding hole of a slag bin 10, an ash outlet is connected with a feeding hole of an ash bin 11, and meanwhile, discharge holes of the slag bin 10 and the ash bin 11 are respectively connected with a feeding hole of a brick making machine 13 through a screw conveyor 12; the waste of resources is reduced by collecting the material slag and ash and further using the material slag and ash for making bricks and using the bricks for road paving or external sales.

The flue gas outlet of the biomass steam boiler 7 is connected with the gas inlet of a cyclone dust collector 14, the gas outlet of the cyclone dust collector 14 is connected with the gas inlet of a spray washing tower 15, the gas outlet of the spray washing tower 15 is connected with the gas inlet of an active carbon deodorizer 16, the gas outlet of the active carbon deodorizer 16 is connected with a chimney 18 through a draught fan 17, and the ash outlet of the cyclone dust collector 14 is connected with the feed inlet of an ash bin 11; the gas treated by the cyclone dust collector 14 is sent into a spray washing tower 15, the generated ash content is stored in an ash bin 11, the gas sprayed by the spray washing tower 15 enters an active carbon deodorizer 16 for deodorization treatment, and the clean gas reaching the standard is discharged into the atmosphere through a chimney 18 under the action of a draught fan 17; in addition, the generated wastewater is discharged to a sewage treatment system while the spray scrubber 15 treats the harmful gas.

A wet waste gas outlet of the sludge drier 3 is connected with a gas inlet of a cooler 19, a gas outlet of the cooler 19 is connected with a combustion chamber of a biomass steam boiler 7, so that wet waste gas discharged from the sludge drier 3 enters the cooler 19 under the action of a fan for heat exchange, and dry waste gas formed after cooling is sent into the combustion chamber of the biomass steam boiler 7 through a gas outlet of the cooler 19 under the action of the fan for auxiliary combustion; the condensed water outlet of the cooler 19 is connected with the water inlet of the spray scrubber 15, so that the condensed water generated in the process of cooling the wet waste gas by the cooler 19 is used as auxiliary water for production and is used for spraying the gas of the spray scrubber 15.

The recycling system is used for stirring and mixing the sludge dried by the sludge drying machine 3 and the agricultural and forestry wastes stored in the agricultural and forestry waste storage bin 1, making the mixture into granular fuel by the granulator 6 and feeding the granular fuel into the biomass steam boiler 7 for combustion; the low-pressure saturated steam generated by the biomass steam boiler 7 is used for power generation by a skid-mounted vertical back pressure steam turbine and a generator 9, the generated power resource is used for self-generation or surplus power is used for surfing the internet, and the exhaust steam after the steam turbine 8 works is used as a heat source to dry wet sludge; meanwhile, the ash and slag generated by the biomass steam boiler 7 are sent into a brick making machine 13 to make road bricks, and the flue gas generated by the combustion of the biomass steam boiler 7 is discharged into the atmosphere after being processed by a cyclone dust collector 14, a spray washing tower 15 and an active carbon deodorizer 16 and meeting the national emission standard; the condensed water generated by the cooler 19 is used for the spraying process of the spray washing tower 15, and the redundant condensed water can be used as water for greening and fire fighting in the plant area.

The recycling system realizes the recycling, energy regeneration and harmless utilization of agricultural and forestry wastes and wet sludge, and simultaneously, compared with a domestic advanced sludge drying and incinerating treatment system, the recycling system has the advantages of saving the operating cost by more than 40%, low operating cost, short investment recovery period, obvious economic benefit and social benefit and great market popularization value.