CN201462771U

CN201462771U - Boiler for recycling high-temperature flue gas and waste heat after biomass burning

Info

Publication number: CN201462771U
Application number: CN200920065521XU
Authority: CN
Inventors: 薛军
Original assignee: Changsha Boiler Plant Co Ltd
Current assignee: Changsha Boiler Plant Co Ltd
Priority date: 2009-08-10
Filing date: 2009-08-10
Publication date: 2010-05-12
Anticipated expiration: 2019-08-10

Abstract

A boiler for recycling high-temperature flue gas and waste heat after biomass burning comprises a flue gas passage with a flue gas inlet and a flue gas outlet; and a first slag coagulation pipe bundle, a second slag coagulation pipe bundle, a lower-temperature superheater, a high-temperature superheater, a water-cooling system and a coal economizer are arranged from the flue gas inlet end in sequence; a steam pocket is arranged outside the flue gas passage; a water outlet of the coal economizer with a water inlet connector is communicated with the steam-water inlet end of the steam pocket; the steam-water outlet end of the steam pocket is communicated with the steam-water inlet ends of the two slag coagulation pipe bundles and the water-cooling system respectively; the steam-water outlet ends of the two coagulation pipe bundles and the water-cooling system are all connected with the steam inlet end of the steam pocket respectively; the saturated steam outlet end of the steam pocket is connected with a steam inlet of the lower-temperature superheater, and a steam outlet of the lower-temperature superheater is connected to the steam inlet end of the high-temperature superheater through a desuperheater; and the high-temperature superheater is provided with a superheated steam output port. Secondary high-pressure superheated steam can be produced, therefore, the erosion caused by the corrosive high-temperature flue gas to the equipment is overcome, and the continuous and safe long-term operation of recycling the high-temperature flue gas is ensured.

Description

High-temperature flue gas heat recovery boiler behind a kind of biomass combustion

Technical field

The utility model relates to the device that high-temperature flue gas used heat that biomass combustion is produced reclaims.

Background technology

The design of present most of waste heat boiler also rests on arranges one group of Crust blocks pipe bundle, and the heating surface of superheater specifically is arranged as counter-flow arrangement, can guarantee that like this heat exchange temperature and pressure are big, saves the area of heating surface, thereby saves steel consumption.Produce the recovery of high temperature waste hot and utilize the aspect but be applied in biomass combustion, then exist obviously not enough; Can cause the sodium of high temperature corrosion and the compound of potassium because comprised in the high-temperature flue gas that biomass combustion produces, the characteristic of this flue gas has caused the seriousness of high temperature corrosion.Therefore, the structural design that is suitable for the high-temperature flue gas heat recovery boiler behind the biomass combustion must be started with from the principle that causes high temperature corrosion, avoids and reduce the generation of high temperature corrosion from root.

The utility model content

The technical problems to be solved in the utility model is, at the defective of prior art existence and the flue gas characteristic of biomass combustion generation high-temperature flue gas, design the high-temperature flue gas heat recovery boiler behind a kind of biomass combustion, can implement to retrieve to produce the superheated steam of sub-high pressure to high temperature waste hot, and overcome the erosion of corrosivity high-temperature flue gas that biomass combustion produces to equipment, assurance is to the recovery and the utilization of high-temperature flue gas, and be able to continuous, safe long-time running, but generate electricity with the sub-high pressure superheated steam steam supply turbine pushing generator that produces.

The technical solution of the utility model is, high-temperature flue gas heat recovery boiler behind the described biomass combustion comprises that an end is that smoke inlet and the other end are the exhaust gases passes of exhanst gas outlet and first Crust blocks pipe bundle, second Crust blocks pipe bundle, low temperature superheater, high temperature superheater, water-cooling system, economizer, drum, attemperator, its design feature is, described exhaust gases passes sets gradually described first Crust blocks pipe bundle, second Crust blocks pipe bundle, low temperature superheater, high temperature superheater, water-cooling system, economizer from the smoke inlet end, and described drum is installed in the exhaust gases passes outside; The delivery port that is provided with the described economizer of water interface into is communicated with the carbonated drink entrance point of drum, the carbonated drink port of export of this drum is communicated with the carbonated drink entrance point of described first Crust blocks pipe bundle and second Crust blocks pipe bundle, water-cooling system respectively, and the carbonated drink port of export of described first Crust blocks pipe bundle and second Crust blocks pipe bundle, water-cooling system all is connected with the steam inlet end of described drum; The saturated vapor port of export of this drum connects with the steam inlet of described low temperature superheater and the steam (vapor) outlet of this low temperature superheater is connected to the steam inlet end of high temperature superheater through attemperator, and described high temperature superheater has the superheated steam output port.

Below the utility model made further specify.

The course of work and the principle of equipment described in the utility model are, the high-temperature waste flue gas that biomass combustion produced is at first continuously by two groups of Crust blocks pipe bundles (i.e. first Crust blocks pipe bundle 1, second Crust blocks pipe bundle 2), the cigarette temperature is reduced rapidly, thereby the flying dust that carries in the flue gas is solidified at this point, unlikely being bonded on the intensive relatively heat-transfer surface pipe in its back; And that the pipe pitch of described Crust blocks pipe bundle itself can be designed to is bigger, makes it can not result in blockage exhaust gases passes; Then, flue gas enters the superheater zone again, because in the product of biomass fuel combustion, the dust stratification that guarantees the pipe outer wall comprised and to cause the sodium of high temperature corrosion and the compound of potassium, and its fusing point is lower, for can not be in molten condition, thereby improve the high temperature corrosion phenomenon of superheater greatly, adopted the heating surface following current has been arranged, promptly arrange two-stage Crust blocks pipe bundle and low temperature superheater (before promptly being arranged in) successively, and high temperature superheater has been arranged in following current arrangement thereafter along flue gas flow direction; And, low temperature superheater 3 is placed on the high-temperature region, high temperature superheater 4 is arranged in low-temperature space, is the arrangement form of two-stage convection superheater; Flue gas is earlier through low temperature superheater, after saturated vapor is overheated therein, behind the direct-contact desuperheater desuperheat, enter high temperature superheater, in high temperature superheater with steam superheating to required overtemperature, thereby guaranteed superheater wall temperature equal overtemperature not in the high and low temperature superheater; Flue gas enters water-cooling system, economizer more successively then, then discharges boiler. and the generation of high temperature corrosion can fundamentally be avoided and reduce to this specially designed structure, thereby guarantee the recovery of biomass high-temperature flue gas and continuous, the safe long-time running of utilization.

Heat transferring medium (water) then at first enters economizer 6 by supply line, feedwater in this economizer 6 by with the heat exchange preheating of hot flue gas after enter drum (drum) 7; Be sent to water-cooling system 5, first Crust blocks pipe bundle 1, second Crust blocks pipe bundle 2 respectively by drum 7 again, saturation water returns drum 7 therein after evaporating with the heat exchange of hot flue gas; Be sent to low temperature superheater 3 by drum 7 again, saturated vapor enters attemperator 8 after overheated with the heat exchange of hot flue gas in low temperature superheater 3; Be sent to high temperature superheater 4 by attemperator 8 again, superheated steam by producing the superheated steam of the sub-high pressure of nominal parameter after overheated with the heat exchange of hot flue gas, is used for generating electricity therein.

Structural configuration shown in Fig. 1 is a through type, also can be arranged as L formula etc.; Its concrete arrangement form can be decided according to the requirement and the needs in on-the-spot place.

As known from the above, the utility model is the high-temperature flue gas heat recovery boiler behind a kind of biomass combustion, it can implement to reclaim and produce the superheated steam of sub-high pressure to high temperature waste hot, and overcome the erosion of corrosivity high-temperature flue gas that substance combustion produces to equipment, guarantee the recovery of high-temperature flue gas and continuous, the safe long-time running of utilization, but the sub-high pressure superheated steam steam supply turbine pushing generator that is produced generating.

Description of drawings

Fig. 1 is the structural representation of a kind of embodiment of the utility model;

Fig. 2 is the heat-absorbing medium pipeline connection diagram of each component units of equipment shown in Figure 1.

In the drawings:

1-first Crust blocks pipe bundle, 2-second Crust blocks pipe bundle, the 3-low temperature superheater,

The 4-high temperature superheater, the 5-water-cooling system, the 6-economizer,

The 7-drum, the 8-attemperator.

The specific embodiment

As depicted in figs. 1 and 2, the high-temperature flue gas heat recovery boiler behind the described biomass combustion comprises that an end is that smoke inlet and the other end are the exhaust gases passes of exhanst gas outlet and first Crust blocks pipe bundle 1, second Crust blocks pipe bundle 2, low temperature superheater 3, high temperature superheater 4, water-cooling system 5, economizer 6, drum 7, attemperator 8; Described exhaust gases passes sets gradually described first Crust blocks pipe bundle 1, second Crust blocks pipe bundle 2, low temperature superheater 3, high temperature superheater 4, water-cooling system 5, economizer 6 from the smoke inlet end, and described drum 7 is located at the exhaust gases passes outside and is installed in the water-cooling system section; The delivery port that is provided with the described economizer 6 of water interface into is communicated with the carbonated drink entrance point of drum 7, the carbonated drink port of export of this drum 7 is communicated with the carbonated drink entrance point of described first Crust blocks pipe bundle 1, second Crust blocks pipe bundle 2, water-cooling system 5 respectively, and the carbonated drink port of export of described first Crust blocks pipe bundle 1, second Crust blocks pipe bundle 2, water-cooling system 5 all is connected with the steam inlet end of described drum 7; The saturated vapor port of export of this drum 7 connects with the steam inlet of described low temperature superheater 3 and the steam (vapor) outlet of this low temperature superheater 3 is connected to the steam inlet end of high temperature superheater 4 through attemperator 8, and described high temperature superheater 4 has the superheated steam output port.

Described exhaust gases passes and first Crust blocks pipe bundle 1, second Crust blocks pipe bundle 2, low temperature superheater 3, high temperature superheater 4, water-cooling system 5, economizer 6, drum 7, attemperator 8 can adopt the prior art structure.

Claims

1. the high-temperature flue gas heat recovery boiler behind the biomass combustion comprises that an end is that smoke inlet and the other end are the exhaust gases passes of exhanst gas outlet and first Crust blocks pipe bundle (1), second Crust blocks pipe bundle (2), low temperature superheater (3), high temperature superheater (4), water-cooling system (5), economizer (6), drum (7), attemperator (8); It is characterized in that, described exhaust gases passes sets gradually described first Crust blocks pipe bundle (1), second Crust blocks pipe bundle (2), low temperature superheater (3), high temperature superheater (4), water-cooling system (5), economizer (6) from the smoke inlet end, and described drum (7) is located at the exhaust gases passes outside; Being provided with into, the carbonated drink entrance point of the same drum of delivery port (7) of the described economizer (6) of water interface is communicated with, the carbonated drink port of export of this drum (7) is communicated with the carbonated drink entrance point of described first Crust blocks pipe bundle (1), second Crust blocks pipe bundle (2), water-cooling system (5) respectively, and the carbonated drink port of export of described first Crust blocks pipe bundle (1), second Crust blocks pipe bundle (2), water-cooling system (5) all is connected with the steam inlet end of described drum (7); The saturated vapor port of export of this drum (7) connects with the steam inlet of described low temperature superheater (3) and the steam (vapor) outlet of this low temperature superheater (3) is connected to the steam inlet end of high temperature superheater (4) through attemperator (8), and described high temperature superheater (4) has the superheated steam output port.