CN102062384A

CN102062384A - Double-inlet double-outlet waste heat boiler system

Info

Publication number: CN102062384A
Application number: CN2011100352736A
Authority: CN
Inventors: 孙军如
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-02-10
Filing date: 2011-02-10
Publication date: 2011-05-18
Anticipated expiration: 2031-02-10
Also published as: CN102062384B

Abstract

The invention discloses a double-inlet double-outlet waste heat boiler system which comprises a filter, an evaporator, an economizer, a water pre-heater, a high-temperature air inlet, a medium-temperature air inlet, a middle exhaust port and a tail exhaust port. By improving the inlet air temperature of the waste heat boiler, the waste heat boiler system disclosed by the invention has the advantage that the steam quality and the generated energy of the waste heat generator unit are improved, and is suitable for low-temperature waste heat recovery system from sintering and the like; the energy utilization rate is improved, and the energy consumption is reduced.

Description

Two air intakes, two air-out afterheat boiler system

Technical field

The present invention relates to the sintering circular-cooler waste heat recovery generating system, be specifically related to a kind of efficient method and equipment thereof that utilizes of central cooler waste heat that is used for steel enterprise sintering technology.

Background technology

At present, in steel manufacture process, the energy consumption of sintering circuit accounts for 12% of total energy consumption, is only second to the ironmaking operation, occupies second.In the sintering circuit total energy consumption, sintering machine tail flue gas and central cooler waste gas have nearly 50% heat energy, main at present one section and two sections the heat energy that uses central cooler, producing steam generating in next life, the defective of existence is employed waste heat boiler, in the process of recovery waste heat, only consider the problem of the amount of waste heat, and the interrogation that does not take into full account waste heat is inscribed, and does not meet the second law of thermodynamics, does not have to make full use of the generating capacity of bringing extra power into play.

Usually adopt the single cycle blower fan at present, one section and the bis sintering ore deposit of cooling off central cooler are introduced the high temperature section and the middle-temperature section of waste heat boiler respectively with cooling off the back hot waste gas that produces, and produce superheated steam and generate electricity.This just causes and makes that the circulating fan EAT is lower, and resulting heatrejection is also lower, thereby the vapor (steam) temperature of being produced is also lower, does not give full play of the generating capacity that sintering deposit has more than 700 ℃.

Summary of the invention

Purpose of the present invention: just amount provides the waste heat boiler of a kind of pair of air intake, two air-out in order to overcome the deficiencies in the prior art.This boiler can solve the problem that above-mentioned waste heat fails to make full use of, and efficiently utilizes the central cooler waste heat, can increase substantially generated energy, significantly reduces the power consumption of sintering process.

Technical scheme: for solving the problems of the technologies described above, the afterheat boiler system of the of the present invention pair of air intake, two air-out comprises boiler body, high temperature air inlet, superheater district, evaporator region are established in the body top of described boiler, warm air inlet between superheater and evaporimeter, establishing, the described high-pressure economizer of establishing, establish the intermediate exhaust mouth behind evaporimeter or high-pressure economizer, the described water preheater of establishing is established the afterbody exhaust outlet behind water preheater; Described high-temp waste gas enters the superheater district of waste heat boiler by the high temperature air inlet pipe by the high temperature air inlet of boiler, described in the wet body enter middle-temperature section before the waste heat boiler evaporimeter by middle temperature air inlet pipe by warm air inlet in the boiler; Describedly will draw from the intermediate exhaust pipe of boiler through a part of gas after the part heat exchange, be used for cooling device, recycle by the high temperature circulation blower fan; Described will drawing through the afterbody exhaust outlet of another part gas after whole heat exchange behind the water preheater by the low temperature circulating fan recycles or emptying.

Beneficial effect of the present invention is:

1) in main production technology just often, adopt two circulating fans, two circulating pipe systems fully improve the temperature of hot waste gas, are used to produce high-temperature steam, improve generated energy;

2) when main production technology changes, adopt two circulating fans, can guarantee waste heat system steam parameter, guarantee cogeneration unit safety economical production.

3) under main production technology normal condition, the present invention can improve generated energy 15%～20%; When main production technology changes greatly, the amplitude that the present invention improves generated energy will be bigger.

Description of drawings

Fig. 1 is the afterheat boiler system schematic diagram of the two air intakes of the present invention, two air-out;

1, waste heat boiler body 2, tailpipe 3, intermediate exhaust pipe 4, low temperature circulating fan 5, high temperature circulation blower fan 6, two sections bellows 7 of central cooler, one section bellows 8 of central cooler, one section petticoat pipe 9 of central cooler, two sections petticoat pipes 10 of central cooler, in warm air inlet pipe 11, high temperature air inlet pipe 12, evaporimeter 13, superheater 14, low-pressure drum 15, high pressure drum 16, feed pump 17, steam turbine 18, condenser 19, oxygen-eliminating device 20, deoxygenation pump 21, condensate pump 22, low-pressure superheater 23, high-pressure economizer 24, low pressure evaporator 25, water preheater

The specific embodiment

Below in conjunction with accompanying drawing the present invention is done further explanation.

As shown in Figure 1, of the present invention pair of air intake, the afterheat boiler system of two air-out, mainly comprise boiler body 1, the body top of described boiler is established the high temperature air inlet and is connected high temperature air inlet pipe 11, superheater 13, evaporimeter 12, warm air inlet and link to each other 11 between superheater 13 and evaporimeter 12, establishing with middle temperature air inlet pipe, the described high-pressure economizer 23 of establishing, behind evaporimeter 12 or high-pressure economizer 23, establish the intermediate exhaust mouth, link to each other 3 with intermediate exhaust pipe, the described low-pressure superheater 22 of before high-pressure economizer 23, establishing, the described low pressure evaporator 24 of behind high-pressure economizer, establishing, water preheater 25, the described afterbody exhaust outlet of establishing behind water preheater 25 links to each other with tailpipe 2.

The afterheat boiler system of the of the present invention pair of air intake, two air-out divides waste gas system workflow and water-steam system workflow as the sintering waste heat boiler

Its waste gas system workflow: the high-temp waste gas of one section petticoat pipe 7 of described central cooler enters superheater 13 high-temperature regions of waste heat boiler by high temperature air inlet pipe 11 by the high temperature air inlet of boiler, and the middle wet body of two sections petticoat pipes 9 of described central cooler enters middle-temperature section before the waste heat boiler evaporimeter 12 by middle temperature air inlet pipe 10 by warm air inlet in the boiler; Describedly will draw from evaporimeter 12 back of boiler or the intermediate exhaust pipe 3 behind the high-pressure economizer 23 through a part of gas after the part heat exchange by high temperature circulation blower fan 5, and send central cooler one section bellows 7, one section of cooling central cooler recycles; Describedly will draw through the afterbody exhaust outlet of another part gas after whole heat exchange behind the water preheater 25, and send central cooler two sections bellows 6,, recycle two sections coolings of central cooler by low temperature circulating fan 4.

The water-steam system workflow of waste heat boiler: the exhaust steam that described steam turbine 17 is discharged, after condenser 18 condensations, become condensate water, send into water preheater by condensate pump 21, after heating, send into low-pressure drum 14, when water shortage by the softened water pump 20 of oxygen-eliminating device 19 to low-pressure drum 14 moisturizings, low-pressure drum 14 passes through Natural Circulation with low pressure evaporator 24, and the low-pressure steam that is produced send steam turbine 17 filling systems to generate electricity after low-pressure superheater 22 heating; Described boiler feed pump 16 will be delivered to the water pressurization of low-pressure drum 14 by pipeline and deliver to high pressure drum 15 after high-pressure economizer 23 heats, high pressure drum 15 produces high steam with evaporimeter 12 by Natural Circulation, sends into steam turbine 17 generatings after superheater 13 heating.The circulation of realization boiler circuit.

The above only is a preferred implementation of the present invention; be noted that for those skilled in the art; under the prerequisite that does not break away from the principle of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims

1. two air intake, the afterheat boiler system of two air-out, comprise boiler body (1), it is characterized in that: described boiler body (1) establish high temperature air inlet pipe (11), in warm air inlet pipe (10), intermediate exhaust pipe (3), tailpipe (2), the described superheater (13) of establishing, evaporimeter (12), water preheater (25), described high-temperature gas is entered the preceding high temperature section of superheater (13) of waste heat boiler (1) by high temperature air inlet pipe (11), middle wet body is entered the preceding middle-temperature section of evaporimeter (12) of waste heat boiler (1) by middle temperature air inlet pipe (10), then after heat exchange, part gas is drawn by high temperature circulation blower fan (5) from the evaporimeter (12) of boiler or the intermediate exhaust pipe (3) behind the high-pressure economizer (23), and send to cooling device, recycle, another part gas is drawn by low temperature circulating fan (4) from tailpipe (2).

2. according to the afterheat boiler system of claim 1 pair air intake, two air-out, it is characterized in that: described waste heat boiler (1) connects one section petticoat pipe of sintering circular-cooler (8) by high temperature air inlet pipe (11), intermediate exhaust pipe (3) connects high temperature circulation blower fan (5) import, the outlet of high temperature circulation blower fan (5) links to each other with one section bellows of central cooler (7), form the high temperature circulation cooling circuit, central cooler is cooled off for one section.

3. according to the afterheat boiler system of claim 1 pair air intake, two air-out, it is characterized in that: described waste heat boiler (1) connects two sections petticoat pipes of sintering circular-cooler (9) by middle temperature air inlet pipe (10), tailpipe (2) connects low temperature circulating fan (4) import, the outlet of low temperature circulating fan (4) links to each other with two sections bellows of central cooler (6), form circulation cooling circuit, central cooler is cooled off for two sections.

4. according to the afterheat boiler system of claim 1 pair air intake, two air-out, it is characterized in that: preferred pair of described waste heat boiler (1) is pressed afterheat boiler electricity-generating systems, comprises the pipeline and the valve of superheater (13), evaporimeter (12), high-pressure economizer (23), low-pressure superheater (22), low pressure evaporator (24), water preheater (25), steam compensating turbine (17), condenser (18), pump (21), oxygen-eliminating device (19), deoxygenation pump (20), boiler feed pump (16), low-pressure drum (14), middle pressure drum (15) and connection with fixed attention.