CN1532454A

CN1532454A - Method and device for recovering cold slag/heat by steam condensation for circular fluidized bed boiler

Info

Publication number: CN1532454A
Application number: CNA03111993XA
Authority: CN
Inventors: 王寅立
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-03-18
Filing date: 2003-03-18
Publication date: 2004-09-29

Abstract

The present invention provides a method and apparatus for recovering cold slag and heat by steam condensation for circular fluidized bed boiler. The method includes water vaporization to absorb heat from high temperature slag the circular fluidized bed boiler exhausts and the continuous discharge of cooled slag via slag discharging machine. The hot vapor produced during the vaporization is used to heat water inside a condensator. The apparatus has also temperature sensor for control of water amount to the vaporizing condensator resulting in discharged slag temperature lower than 105 deg.c for convenient transport of the slag and recovery of hot water in high grade over 100 deg.c. The present invention can utilize heat fully.

Description

The method of CFBB gas condensate cold dreg/heat recovery and device

Affiliated technical field

The invention belongs to the cooling and the heat recovery technical field of boiler slag removal, what relate generally to is a kind of method and device of CFBB gas condensate cold dreg/heat recovery.

Background technology

At present, CFBB is able to fast development at home and abroad with its unique separation of flow technology.But CFBB in use exists the problem of deslagging temperature height (950 ℃-850 ℃) and never has solution preferably, has caused thus the thermal pollution of environment and the wasting phenomenon of heat energy.Known various cooling and exhaust heat recovering method, though can play a role, effect is all not satisfactory.As: 1, surface water cooling method, its principle are that warm sludge is entered in the cooler, warm sludge by cooler tube and barrel and inside and outside it cooling water in interlayer carry out heat exchange because this heat exchange method difficulty, and cooling effect is poor, thereby now seldom adopts; 2, air cooling method, it is to utilize high-head wind, the warm sludge that the cooling pan fire grate goes out, and with the hot blast boiler of feeding burning use of reclaiming.The blowing out cleaning of having to of wind bed is stopped up because of the iron block in boiler coke and the fire coal by regular meeting because this method is in operation; and the temperature of hot blast can change with the size of bed drain purge; thereby; the variation meeting of hot blast temperature produces certain influence to the stability of boiler combustion, so present stage also seldom adopts.3, drum-type cooling method, its principle is to import in the barrel interlayer that rotates by the first cooling water of rotating water, because cooling water can absorb the heat of slag equably in the drum turning process, thereby cooling effect is better, waste heat also can obtain recycling, its deslagging temperature can drop to about 150 ℃, existing extensively employing.But it in use still has the following disadvantages: (1), volume are big, cause in boiler bottom difficulty in installation and layout (2), owing to belong to large-scale rotary machine, so the power consumption height; (3), cylinder and slag contact rotating, the hardness of slag can cause heavy wear to cylinder, and particularly the inlet position of slag needs often to repair especially, can only reach the service life of a general equipment about 3 years, and the rotating water head easily leaks, and needs maintenance once in general one month; (4), the cooling water system complexity owing to be subjected to the restriction of drum-type cooling device structure, the pressure of cooling water generally reaches about 0.4Mpa, therefore, the water of steam turbine condensate pump directly can not be sent into the deoxygenation water tank on power plant utilizes.Need will to coagulate earlier feed pump come can send into slag cooler after water (about 1.0Mpa) decompression, the hot water that is come out by slag cooler just can be sent into the deoxygenation water tank again and use after pump boosts to 0.8Mpa, system is complexity; (5), slag cooler delivery port water temperature lower (having only about 60 ℃), the enthalpy matter of heat recovery is lower, and required cooling water inflow is bigger, is unfavorable for the recovery of hot water, causes in the system control difficulty.

Summary of the invention

Purpose of the present invention promptly produces thus, proposes a kind of method and device of CFBB gas condensate cold dreg/heat recovery.To overcome above-mentioned deficiency.

The present invention realizes that the technical scheme of said method is: the high temperature furnace slag that CFBB is discharged is discharged by slag extractor continuously with water vapor cooling back; The vapours that produces in its vaporescence enters in the condenser and to heating by the water in this condenser.

The present invention realizes that the technical scheme of said method device is: the scum pipe position at existing CFBB is provided with the vaporization cooling chamber, be provided with the vaporization ingress pipe in this vaporization cooling chamber, its top is communicated with the scum pipe of boiler, the lower end is connected with slag extractor, it is communicated with by steam lead with condenser, is provided with heat-exchange tube in condensation chamber, and the entrance point of this heat-exchange tube is connected with cooling water pipe, the port of export is connected with the hot water outlet pipe, also is provided with blast pipe and drip pipe on condenser.

The present invention conceives uniqueness, the structural design compactness, volume is little, mounting arrangements is simple, its warm sludge that utilizes the vaporization cooling means that boiler is discharged cools off, and control entering the water yield of vaporization in the cooling chamber by temperature sensor, make slag that the cooling back discharges for less than 105 ℃ dried slag, be convenient to the entrucking transportation.The method recovery waste heat that the vapours that produces in the vaporescence is coagulated by vapour, and control by inflow to condenser, thus can be recovered to more than 100 ℃ than the hot water of high-grade, be convenient to make full use of.The automatic discharge machine of its setting can be realized continuously controlledly deslagging, thereby the warm sludge in the vaporization cooling chamber is remained in certain scope.

Description of drawings

The accompanying drawing that the present invention gives is a structural representation.

Among the figure, 1, scum pipe, 2, ash gate, 3, the vaporization cooling chamber, 4, vaporize water ingress pipe, 5, temperature sensor, 6, slag extractor, 7, steam lead, 8, blast pipe, 9, condenser, 10, heat-exchange tube, 11, cooling water pipe, 12, the hot water outlet pipe, 13, thermometer, 14, drip pipe, 15, water seal, 16, blow-off pipe, 17, the water regulating valve door, 18, cleaning hose.

The specific embodiment

In conjunction with the accompanying drawings, it is as follows to provide embodiments of the invention:

As shown in drawings, the present invention is that the high temperature warm sludge water vaporization cooling back of will existing CFBB discharging is controlledly discharged evenly by slag extractor, and with the vapours that produces in the vaporescence through condensation, the hot water of recovery is sent in the oxidation water tank and is used.Its concrete scheme is that vaporization cooling chamber 3 is set at the slag notch position of boiler slag removal pipe 1.The port of export of boiler slag removal pipe 1 stretches into the top of vaporization cooling chamber 3, and its objective is between the top that is deposited in the warm sludge in the vaporization cooling chamber 3 and the cooling chamber 3 of vaporizing has a vaporization space.For ease of maintenance, on boiler slag removal pipe 1, be provided with ash gate 2, this ash gate 2 is in normally open usually, only breaking down maybe need overhaul the time, just is used to cut off warm sludge.Slag notch position at vaporization cooling chamber 3 is provided with slag extractor, this slag extractor 6 can be the scraper plate slag extractor, also can be oscillatory type or vane type slag extractor, present embodiment is the scraper plate slag extractor, cooled cinder is controlledly discharged continuously in its cooling chamber 3 of will vaporizing serially, thereby make the warm sludge amount that enters in the vaporization cooling chamber 3 cooling quantity of slag interior consistent, vapor (steam) temperature is remained in certain temperature range with discharging the vaporization cooling chamber.On vaporization cooling chamber 3, also be provided with vaporize water ingress pipe 4, this vaporize water ingress pipe 4 can be shape in the lump be arranged on warm sludge above, with water directly spray in warm sludge above, the effect of playing the cooling slag and producing steam, also vaporize water ingress pipe 4 directly can be embedded in the warm sludge, by the purpose that realizes cooling off warm sludge and produce superheated steam to the inner injection of warm sludge cooling water.For guaranteeing that by the slags of discharging in the vaporization cooling chamber 3 be dried slag less than 105 ℃, on vaporize water ingress pipe 4, be provided with water regulating valve door 17, this water regulating valve door 17 is by temperature sensors 5 controls that are arranged in the vaporization cooling chamber 3.Also be provided with the steam lead 7 that is communicated with condenser 9 on vaporization cooling chamber 3, be provided with heat-exchange tube 10 in the condenser 9, this heat-exchange tube 10 is a coiled pipe, and its entrance point is connected with cooling water pipe 11, and the port of export is connected with hot water outlet pipe 12.Be provided with drip pipe 14 in the lower end of condenser 9, overflow, be provided with water seal 15, also be provided with blow-off pipe 16 on this water and soil envelope 15 in the lower end of drip pipe 14 for preventing steam.Because the steam that enters in the condenser 9 contains certain impurity, for preventing these impurity attached to influencing heat exchange effect on the heat-exchange tube 10, the top in condenser 9 is provided with fountain cleaning hose 18.Be the convenient control of observing, on the steam lead 7, be equipped with thermometer 13 on the cooling water pipe 11 and on the hot water outlet pipe 12.

The course of work of present embodiment is as follows: the high temperature furnace slag of discharging by CFBB scum pipe 1 under the effect of gravity in ash gate 2 enters vaporization cooling chamber 3, the adjustable valve door 17 of fetching boiling water, water is in water regulating valve door 17 enters vaporization cooling chamber 3, utilize the vaporization of water to absorb heat in the warm sludge rapidly, make the slag cooling and generate the steam that certain overtemperature is arranged.Cooled slag is controlledly discharged continuously by the slag extractor 6 of vaporization cooling chamber 3 bottoms, and the steam that certain degree of superheat arranged through steam lead 7 enters condenser 9 in and with condenser 9 in the heat-exchange tube 10 of setting carry out heat exchange, the CO that contains in the steam, H ₂Outdoor by blast pipe 16 discharges of condenser 9 upper ends etc. a small amount of incoagulable gas, the water that condensation forms is discharged by blow-off pipe 16 through water seal 15 by drip pipe 14.The hot water that is obtained by heat-exchange tube 10 is in hot water outlet pipe 12 delivers to the deaerator storage tank of boiler, and the boiler of feeding feedwater is used, and reaches the purpose of heat recovery.

Claims

1, a kind of method of CFBB gas condensate cold dreg/heat recovery is characterized in that: the high temperature furnace slag that CFBB is discharged utilizes water vapor to absorb heat of slags and cooled slag is discharged continuously by slag extractor; The vapours that produces in its vaporescence enters in the condenser and to heating by the water in this condenser.

2, a kind of device of realizing the CFBB gas condensate cold dreg/heat recovery of claim 1, comprise boiler slag removal pipe (1), it is characterized in that: the slag-drip opening end at described boiler slag removal pipe (1) is provided with vaporization cooling chamber (3), the top of this vaporization cooling chamber (3) is communicated with the scum pipe (1) of boiler, the lower end slag-drip opening is connected with slag extractor (6), inside is provided with vaporize water ingress pipe (4), and it is communicated with by steam lead (7) with condenser (9); Be provided with heat-exchange tube (10) in condenser (9), the entrance point of this heat-exchange tube (10) is connected with cooling water pipe (11), and the port of export is connected with hot water outlet pipe (12), also is provided with blast pipe (8) and drip pipe (14) on condenser (9).

3, the method for CFBB gas condensate cold dreg/heat recovery according to claim 1 is characterized in that: the vaporize water of cooling of described high temperature furnace slag can also can directly inject slag inside by slag top spray on the slag surface.

4, the method for CFBB gas condensate cold dreg/heat recovery according to claim 1 is characterized in that: described is the steam turbine condensed water by the water in the cooler, and the condensed water after heating is delivered to the deoxygenation water tank of steam turbine again.

5, the device of CFBB gas condensate cold dreg/heat recovery according to claim 2 is characterized in that: described vaporize water ingress pipe (4) is a circulus, its can be arranged on vaporization cooling chamber (3) interior warm sludge above; Also can be arranged on the warm sludge center.

6, the device of CFBB gas condensate cold dreg/heat recovery according to claim 2 is characterized in that: described slag extractor (6) can be the scraper plate slag extractor, also can be oscillatory type slag extractor or vane type slag extractor.

7, the device of CFBB gas condensate cold dreg/heat recovery according to claim 2, it is characterized in that: described vaporize water ingress pipe (4) is provided with water regulating valve door (17), and this water regulating valve door (17) is by temperature sensor (5) regulation and control that are arranged in the vaporization cooling chamber (3).

8, the device of CFBB gas condensate cold dreg/heat recovery according to claim 2 is characterized in that: be provided with water seal (15) on the drip pipe (14) of described condenser (9), this water seal (15) is provided with blow-off pipe (16).

9, the device of CFBB gas condensate cold dreg/heat recovery according to claim 2 is characterized in that: be provided with cleaning hose (18) in described condenser (9).

10, the device of CFBB gas condensate cold dreg/heat recovery according to claim 2 is characterized in that: be provided with in described blast pipe (8) and prevent that outdoor air from entering the respirator in the condenser.