CN201678575U - An integrated device for sludge drying, incineration and power generation - Google Patents

Abstract

The utility model discloses an integrated device for sludge drying, incineration and power generation. Including the spiral rotary sludge dryer, the dried sludge enters the fluidized bed boiler for incineration, the steam generated by incineration is used to generate electricity, and the exhaust steam of the small steam turbine is used to dry the sludge to realize the cascade utilization of steam heat energy; The electric energy generated by the small generator set is enough to meet the electricity consumption of equipment operation, which reduces the operating cost, fully saves energy, and integrates sludge drying, incineration and power generation. The utility model uses the spiral rotary sludge dryer to feed the fluidized bed incineration boiler, uses the steam generated by incineration to generate electricity, and uses the low-grade exhaust gas of the steam turbine as the heat source of the dryer, greatly improving the thermal efficiency of the steam power plant; At the same time, the electric energy generated by the small generator set is sufficient to meet the power consumption of the equipment, which reduces the operating cost; the system adopts an integrated design, the connection of the integrated device is reasonable and compact, and the equipment structure is mature, which has good economy.

Description

An integrated device for sludge drying, incineration and power generation

technical field

The utility model relates to a treatment method for solid waste to be harmless, resourced, and energy-based, and more particularly relates to an integrated device for sludge drying, incineration, and power generation.

Background technique

All kinds of sediment and floating matter produced in the process of water supply and wastewater treatment are collectively referred to as sludge. Sludge produced by general sewage treatment plants is a solid or fluid substance with a water content ranging from 75% to 99%. Due to its high organic content, perishability, strong odor, and contains parasite eggs, pathogenic microorganisms and heavy metals such as copper, zinc, chromium, mercury, as well as salts, polychlorinated biphenyls, dioxins and other refractory substances Toxic and harmful substances, if not handled properly, will be discharged randomly, which will cause secondary pollution.

With the development of social economy and urbanization, the amount of urban sewage is increasing. Sewage treatment is accompanied by a large amount of sludge. The disposal method centered on incineration has the advantages of minimizing the volume of excess sludge, fast processing speed, recovery of energy contained in sludge and complete removal of toxic and harmful substances. Incineration and other advantages have become the most thorough sludge disposal method.

In the existing technology, the implementation of sludge drying and incineration technology is divided into two categories. One is to rely on the existing thermal power plant to build, using the steam of the thermal power plant to dry, and the dried sludge is sent to the boiler for incineration. The power generation of the turbo-generator set in this kind of thermal power plant is relatively high, all of which are above 6MW and 12MW, and the electricity is mainly sent to the grid. The other is the sludge drying and incineration plant built separately. After the sludge is dried, it enters the fluidized bed boiler for incineration. The steam generated by incineration is used for sludge drying, and the steam generated by incineration is only used as sludge drying. The heat source of the chemical machine is not converted into higher-grade electric energy, while the dry incineration equipment consumes a lot of power during operation, and the overall operating cost is relatively high. The heat source of the machine only needs a temperature below 200°C, and the energy waste is serious. Therefore, it is important to develop an integrated sludge drying, incineration and power generation integration technology to realize the cascade utilization of sludge incineration heat energy and reduce the overall cost of system operation. application value.

Contents of the invention

The purpose of this utility model is to provide an integrated device for sludge drying, incineration and power generation, which solves the problem of sludge treatment process in the prior art. Technical problems such as not being able to take full advantage.

The technical scheme that the utility model adopts is:

1. An integrated method of sludge drying, incineration and power generation:

Use the spiral rotary sludge dryer to dry the wet sludge with a moisture content of 80%-85% to below 40% and become 1-5mm sludge particles. The heat source is the steam generated by a small steam turbine; after drying The sludge enters the fluidized bed boiler through the material conveying system for incineration. The boiler body is equipped with an air chamber, an air distribution device, a furnace, a separator in the furnace, a superheater, an economizer, and an air preheater. There is a steam drum, the air is provided by the blower, and there is a slag outlet behind the air distribution device; the heat energy released by the sludge after incineration is absorbed by the steam and converted into steam heat energy, which is used for small generators to generate electricity, realizing the cascade utilization of steam heat energy ; The electricity generated by the small generator is used by the electric equipment of the auxiliary system of the dryer and the boiler for its own use, so as to meet the self-balancing of the power consumption of the system.

2. An integrated device for sludge drying, incineration and power generation:

Including spiral rotary dryer, fluidized bed boiler, small steam turbine and small generator; wet sludge is fed into the screw rotary sludge dryer through the feed inlet, and the belt for the dry sludge outlet of the spiral rotary sludge dryer The conveyor transports the dried sludge to the fluidized bed boiler. After the steam is heat-exchanged and condensed, it is connected to the boiler feed pump through the condensed water outlet. The steam generated by the fluidized bed boiler is connected to a small steam turbine through a superheated steam pipeline to drive a small generator to generate electricity. , the low-grade steam that is worked by a small steam turbine is input into the hollow heat shaft inlet of the spiral rotary sludge dryer.

In the small power generation system composed of a small steam turbine and a small generator, the power of the generator set is below 1000kw.

The beneficial effect that the utility model has is:

The utility model integrates sludge drying, incineration and power generation, and compared with the prior art, the effect is positive and obvious. The utility model uses the spiral rotary sludge dryer to feed the fluidized bed incineration boiler, uses the steam generated by incineration to generate electricity, and uses the low-grade exhaust gas of the steam turbine as the heat source of the dryer, which greatly improves the thermal efficiency of the steam power device ; At the same time, the electric energy generated by the small generator set is sufficient to meet the power consumption of the equipment, which reduces the operating cost; the system adopts an integrated design, the connection of the integrated device is reasonable and compact, the equipment structure is mature, and it has good economy. The urban sewage sludge treatment problem has important application value.

Description of drawings

The accompanying drawing is a schematic diagram of the structural principle of the integrated method and device for sludge drying, incineration and power generation of the present utility model.

In the figure: 1. Spiral rotary dryer, 2. Fluidized bed boiler, 3. Small steam turbine, 4. Small generator, 5. Wet sludge inlet, 6. Dry sludge outlet, 7. Superheated steam, 8. Low-grade steam, 9. Condensed water outlet.

Detailed ways

As shown in the drawings, the utility model includes a screw rotary dryer 1, a fluidized bed boiler 2, a small steam turbine 3 and a small generator 4; the wet sludge is fed into the screw rotary sludge dryer 1 through the feeding inlet 5 , the dry sludge outlet 6 of the spiral rotary sludge dryer 1 uses a belt conveyor to transport the dried sludge to the fluidized bed boiler 2, after the steam is heat-exchanged and condensed, it is connected to the boiler feed water pump through the condensate outlet 9, and flows The steam generated by the chemical bed boiler 2 is connected to the small steam turbine 3 through the superheated steam pipeline to drive the small generator 4 to generate electricity, and the low-grade steam 8 that works through the small steam turbine 3 is input into the hollow heat shaft inlet of the spiral rotary sludge dryer 1.

The described small power generation system is composed of small steam turbine 3 and small generator 4, and the power of the generator set is below 1000kw.

The working principle of the utility model is as follows:

As shown in Figure 1, the sludge drying, incineration and power generation integrated system of the present utility model includes a step of using a spiral rotary sludge dryer 1 to dry the sludge, and a fluidized bed incineration boiler 2 to incinerate the sludge and generate steam. steps, and a small steam turbine 3 and a small generator 4 to generate electricity. The spiral rotary sludge dryer 1 is equipped with two hollow heat shafts connected to the transmission mechanism. The low-grade exhaust gas 8 of the small steam turbine 3 enters the inlet of the hollow heat shaft, and the sludge is heated and dried by indirect heating. After heat exchange and condensation, the condensed water outlet 9 and the boiler feed water pump are pumped into the boiler for reuse, and the wet sludge with a moisture content of 80%-85% is dried to a moisture content of less than 40% through the hollow heat shaft heat exchange, and becomes 1 -5mm sludge particles; the dried sludge enters the fluidized bed boiler through the material conveying system for incineration. The boiler body is equipped with an air chamber, an air distribution device, a furnace, a separator in the furnace, and a superheater to save coal There is an air preheater, a steam drum above the furnace, the air is provided by a blower, and a slag outlet is provided behind the air distribution device; the heat energy released by the sludge after incineration is absorbed by the steam, and the superheated steam 7 is generated by the heat exchanger and enters the small The steam turbine 3 drives the small generator 4 to do work, and the generated electric energy is used as production electricity, which realizes the cascade utilization of steam heat energy; the electricity generated by the small generator is used by the auxiliary equipment of the dryer and the boiler for its own use, meeting the requirements of the system. Electricity self-balancing.

Claims (2)

1. An integrated device for sludge drying, incineration and power generation, characterized in that it includes a spiral rotary dryer (1), a fluidized bed boiler (2), a small steam turbine (3) and a small generator (4); The sludge is fed into the screw rotary sludge dryer (1) through the feeding inlet (5), and the dried sludge outlet (6) of the screw rotary sludge dryer (1) uses a belt conveyor to transport the dried sludge Transported to the fluidized bed boiler (2), after the steam is heat-exchanged and condensed, it is connected to the boiler feed water pump through the condensed water outlet (9), and the steam generated by the fluidized bed boiler (2) is connected to the small steam turbine (3) through the superheated steam pipeline to drive The small generator (4) generates electricity, and the low-grade steam (8) that is worked by the small steam turbine (3) is input into the hollow heat shaft inlet of the spiral rotary sludge dryer (1). 2. A kind of integrated device for sludge drying, incineration and power generation according to claim 1, characterized in that: the small power generation system consisting of a small steam turbine (3) and a small generator (4), the generator set The power is below 1000kw.

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