CN207080980U - A large steam-water dual-purpose boiler - Google Patents

Abstract

A kind of large-scale steam-water dual-purpose type boiler, belongs to boiler plant technical field.The utility model, which solves existing power plant and enterprise, to be needed heating is respectively configured and the boiler that steams; or using the external heat supply of mode after steam-water heat exchanging is carried out after partial high pressure steam pressure-reducing again; to solve the heating problem in region, while meet seasonal process steam and peak power generation requirements and existing equipment downtime is long, utilization rate is low, safeguards and the problem of the cost of overhaul is high, space is big.The bottom of afterbody economizer system is provided with feed-water inlet, the bottom of air preheater system is provided with air intlet and exhanst gas outlet, the top of air preheater system is provided with hot-blast outlet, the top of afterbody economizer system is connected by the second connecting tube with drum, saturated vapor export pipeline is also associated with drum, the entrance of superheater system is connected with water return pipeline, and the exit of superheater system is connected with water supply header and collection vapour header.The utility model is used to heating, steam supply and power supply.

Description

A kind of large-scale steam-water dual-purpose type boiler

Technical field

A kind of large-scale steam-water dual-purpose type boiler is the utility model is related to, belongs to boiler plant technical field.

Background technology

Recently as developing rapidly for national economy, country, which can consume, increasingly to be increased, and environmental problem becomes increasingly conspicuous.Country Go into overdrive to readjust the energy structure, promote cleaning low-carbon energy, the renewable sources of energy, slow down coal electric construction and set rhythm, coal electricity scale of keeping under strict control. Influenceed by local climate, typically there is the boiler of the heating period of 3~6 months, part power plant and enterprise configuration the northern area of China Equipment should solve the heating problem in region, while also meet seasonal process steam and the requirement that peak generates electricity, therefore greatly Some Enterprises are heating to be respectively configured and the boiler that steams, or using steam-water heat exchanging is carried out again after partial high pressure steam pressure-reducing after The external heat supply of mode.There is equipment downtime length in this two ways, utilization rate is low, the maintenance of equipment and the cost of overhaul The problems such as height, space is big, and initial investment cost is high.

Utility model content

The utility model is to need heating is respectively configured and the boiler that steams to solve existing power plant and enterprise, Huo Zheli With the external heat supply of mode after steam-water heat exchanging is carried out after partial high pressure steam pressure-reducing again, to solve the heating problem in region, simultaneously Meet seasonal process steam and peak power generation requirements and existing equipment downtime is long, utilization rate is low, safeguard and overhaul into The problem of this height, big space, and then provide a kind of large-scale steam-water dual-purpose type boiler.

The utility model is that technical scheme is used by solving above-mentioned technical problem：

A kind of large-scale steam-water dual-purpose type boiler, it includes drum, burner hearth, furnace wall cooling, superheater system, afterbody and saves coal Device system and air preheater system, wherein burner hearth, superheater system, afterbody economizer system and air preheater system It is sequentially connected, the lower end of furnace wall cooling is connected by down-comer with drum, and the upper end of furnace wall cooling passes through the first connecting tube It is connected with drum, drum, down-comer, furnace wall cooling, the first connecting tube form natural convection loop, afterbody economizer system Bottom is provided with feed-water inlet, and the bottom of air preheater system is provided with air intlet and exhanst gas outlet, air preheater system The top of system is provided with hot-blast outlet, and the top of afterbody economizer system is connected by the second connecting tube with drum, on drum also Saturated vapor export pipeline is connected with, the entrance of superheater system is connected with water return pipeline, and the exit of superheater system connects It is connected to water supply header and collection vapour header.

Further, the superheater system is arranged according to boiler pressure, and wherein high voltage parameter boiler configures three groups Superheater and two-stage desuperheating water system, arrangement two-stage desuperheating water system is interted between three groups of superheaters and carries out desuperheat, to control master Stripping temperature；Medium-pressure boiler configures two-stage superheater and one-level Attemperation water system, and one-level desuperheat water system is used between two-stage superheater System carries out desuperheat, to control Stream temperature degree；Low-pressure boiler configures primary superheater and one-level Attemperation water system.

Further, when boiler pressure parameter is middle pressure, the superheater system includes low temperature superheater, desuperheat Water system and high temperature superheater, connected between low temperature superheater and drum by parallel arrangement of 3rd connecting tube and the 4th connecting tube Connect, first stop valve is respectively set in the 3rd connecting tube and the 4th connecting tube；Low temperature superheater and high temperature superheater it Between connected by parallel arrangement of 5th connecting tube and the 6th connecting tube, wherein be provided with Attemperation water system in the 5th connecting tube, The second stop valve, Attemperation water system and hyperthermia and superheating are provided with the 5th connecting tube between Attemperation water system and low temperature superheater The 3rd stop valve is provided with the 5th connecting tube between device, the 4th stop valve is provided with the 6th connecting tube；High temperature superheater Outlet collection vapour header is connected with by the 7th connecting tube, the outlet of high temperature superheater is connected with water supply collection by the 8th connecting tube Case, the 5th stop valve is provided with the 7th connecting tube, the 6th stop valve is provided with the 8th connecting tube；Water return pipeline It is connected with low temperature superheater, the 7th stop valve is provided with the water return pipeline；The 8th is provided with saturated vapor export pipeline Stop valve.

Further, the first electric control valve, the both ends point of first electric control valve are additionally provided with water return pipeline The 9th stop valve has not been arranged in series, and the first electric control valve and two the 9th stop valves are arranged in parallel with the 7th stop valve.

Further, the first electric gate valve is additionally provided with saturated vapor export pipeline.

Further, Attemperation water system includes direct-contact desuperheater and the desuperheat water lines being arranged on direct-contact desuperheater, institute State direct-contact desuperheater to be arranged in the 5th connecting tube, the second electric control valve is provided with the desuperheat water lines and positioned at second Tenth stop valve at electric control valve both ends.

Further, it is pre- to include upper strata air preheater, middle level air preheater and lower air for air preheater system Hot device.

Further, afterbody economizer system includes lower floor's afterbody economizer and upper strata afterbody economizer.

The utility model has the following effects that compared with prior art：

1st, boiler can realize different pressures, and a variety of media of different temperatures are supplied simultaneously；

2nd, separate unit boiler can realize the function of two boilers, can switch between superheated steam, saturated vapor and hot water, Switch to hot water side and steam and heat supply in winter requirement needed for production are provided；Superheated steam boiler is also can switch in addition, with full The generating of sufficient peak period and process steam demand.On the one hand it can save that equipment front capital input, device systems are simple, it is empty to take up an area Between it is small；On the other hand the utilization rate of equipment is improved, is steamed and a variety of demands of steam supply by switching to realize；

3rd, the operation maintenance of reduction, maintenance, running cost；

4th, boiler type and fuel tolerance are wide；

5th, by boiler overheating section caloric receptivity, (overheat heat absorption accounts for the effectively hot ratio of boiler：Low pressure cooker about 13.5%, medium-pressure boiler About 18.4%, 27.4%) high-pressure boiler is about converted into the external heat supply of a heat hot water (220t high-temperature high-pressure boiler, after transformation The external heat supply of superheating system is about 42MW, saves about 4,000,000 yuan of the investment of equipment), both meet that heating requires, while save equipment Space..

Brief description of the drawings

Fig. 1 is structural representation of the present utility model；

Fig. 2 is the utility model working medium flow schematic diagram.

Embodiment

Embodiment one：With reference to Fig. 1,2 explanation present embodiments, a kind of large-scale steam-water dual-purpose type boiler, it includes Drum 1, burner hearth 2, furnace wall cooling 3, superheater system 4, afterbody economizer system 5 and air preheater system 6, wherein stove Thorax 2, superheater system 4, afterbody economizer system 5 and air preheater system 6 are sequentially connected, the lower end of furnace wall cooling 3 It is connected by down-comer 7 with drum 1, the upper end of furnace wall cooling 3 is connected by the first connecting tube 8 with drum 1, drum 1, is declined Pipe 7, furnace wall cooling 3, the first connecting tube 8 form natural convection loop, the bottom of afterbody economizer system 5 be provided with feed water into Mouth 10, the bottom of air preheater system 6 is provided with air intlet 11 and exhanst gas outlet, and the top of air preheater system 6 is set Hot-blast outlet 13 is equipped with, the top of afterbody economizer system 5 is connected with drum 1 by the second connecting tube 9, is also connected with drum 1 There is saturated vapor export pipeline 14, the entrance of superheater system 4 is connected with water return pipeline 15, the exit of superheater system 4 It is connected with water supply header 16 and collection vapour header 17.

Large-scale steam-water dual-purpose type boiler in the utility model, its main heating surface have：Burner hearth 2, superheater system 4 (save Coal device system), afterbody economizer system 5 and air preheater system 6.Wherein：

Flue gas flow：Fuel produces high-temperature flue gas after being burnt in burner hearth 2, successively washes away the superheater in the exit of burner hearth 2 (i.e. afterbody erects the economizer system in flue and air preheat for system 4, afterbody economizer system 5 and air preheater system 6 Device system 6), last tail flue gas is discharged into air from chimney after treatment.

Working medium flow：Boiler of the present utility model, its working medium flow are divided into two ways, and mode one produces superheated steam, Mode two produces saturated vapor and hot water simultaneously.

Mode one：

Superheated steam system：Boiler is fed water the → 9 → pot of connecting tube of afterbody economizer system 5 → the second by feed-water inlet 10 Cylinder 1 → superheater system 4 → generation superheated steam enters collection vapour header 17, to meet the generating of peak period and process steam need Ask.Wherein, superheater system 4 is arranged according to boiler pressure and temperature, and it includes superheater and Attemperation water system, high pressure Parameter boiler configures three groups of superheaters and two-stage desuperheating water system；Medium-pressure boiler configures two-stage superheater and one-level desuperheat water system System；Low-pressure boiler configures primary superheater and one-level Attemperation water system；

Mode two：

1st, saturated vapor system：Boiler fed water by feed-water inlet 10 → and the connecting tube 9 of afterbody economizer system 5 → the second → Drum 1 → generation saturated vapor is supplied to pipe network, to meet process steam demand；

2nd, heating system：Entered by 15 backwater of water return pipeline → superheater system 4 (no Attemperation water system) → offer hot water Enter to supply water header 16, to meet heat demand.

Air flow：Cold wind → steam air heater is (not shown in figure, or using mixing bellows, extraction section air preheater The hot blast of outlet is mixing bellows mixing with cold wind.) → air preheater system 6 → burner air distribution outlet.

Burner hearth 2 uses full film type wall structure, and the fuel of boiler requires according to user, can be the coal of solid, or liquid Fuel oil, and gaseous fuel, burner configured according to the characteristic and emission request of fuel.

Pipeline afterbody economizer and air preheater system 6, it is responsible for heating feedwater and preheating cold air, while reduces suction Fume afterheat is received, reduces exhaust gas temperature.

The second electric gate valve 37 is additionally provided with the export pipeline of collection vapour header 17, for controlling superheated steam to enter pipe network On and off.

Superheater matches steel pipe according to the parameter of superheater, and tube bank is used and is arranged vertically, and sets hydrophobic and compressed air Interface is purged, needs that tube bank and header purge before working medium switching is carried out and hydrophobic；During superheater heat hot water, using strong System circulation, intraductal working medium are calculated by permissible velocity and are determined, and supply and return water temperature is higher than return water temperature 60~80 DEG C, and supply water pressure Power is 2.0MPa or so.Notice that timing carries out pickling and flushing to superheater simultaneously, it is ensured that dirt in superheater vapour, ensure equipment Service life.

The utility model can realize the switching of superheated steam, saturated vapor and hot water supply.Enterprise is in generating peak rank Section, switch to superheated steam and carry out steam supply generating, during heating in the winter time, can switch to saturated vapor and hot water to meet heat supply need Ask.Another Some Domestic small cogeneration enterprise at present is to generate electricity summer, heat supply in winter, by national energy structural adjustment and " 13 planning " influences, and the rectification that stops doing business the problems such as energy utilization rate is low, is faced in Some Enterprises face because the unit generation amount of configuration is few Problem.The boiler of this type can be rectified and improved by using form of the present utility model, farthest using former boiler by Hot face, only it need to increase a heat network system, carrying out local rectification to superheater header and carbonated drink fairlead can complete.For another bar Part allows or met special circumstances, also can switch to superheated steam steam supply, is generated electricity.Compared with newly constructed boiler, the work of transformation Journey amount is few, and the cycle is short, and infusion of financial resources is few.Other steam boilers can refer to the utility model, and steam boiler is changed into heating boiler.

Embodiment two：With reference to Fig. 1,2 explanation present embodiments, the superheater system 4 is according to Boiler Steam pressure Power arranges that wherein high voltage parameter boiler configures three groups of superheaters and two-stage desuperheating water system, interts arrangement between three groups of superheaters Two-stage desuperheating water system carries out desuperheat, to control Stream temperature degree；Medium-pressure boiler configures two-stage superheater and one-level Attemperation water system, Desuperheat is carried out using one-level Attemperation water system between two-stage superheater, to control Stream temperature degree；Low-pressure boiler configuration one-level overheat Device and one-level Attemperation water system.Other compositions are identical with embodiment one with annexation.

Embodiment three：With reference to Fig. 1,2 explanation present embodiments, when boiler pressure parameter is middle pressure, institute Stating superheater system 4 includes low temperature superheater 4-1, Attemperation water system 4-2 and high temperature superheater 4-3, low temperature superheater 4-1 and pot Connected between cylinder 1 by parallel arrangement of 3rd connecting tube 18 and the 4th connecting tube 19, the 3rd connecting tube 18 and the 4th connects One the first stop valve 24 is respectively set in adapter 19；By parallel arrangement of between low temperature superheater 4-1 and high temperature superheater 4-3 5th connecting tube 20 and the 6th connecting tube 21 connect, wherein Attemperation water system 4-2 is provided with the 5th connecting tube 20, desuperheat water system The second stop valve 25, Attemperation water system 4-2 and height are provided with the 5th connecting tube 20 between system 4-2 and low temperature superheater 4-1 The 3rd stop valve 26 is provided with the 5th connecting tube 20 between warm superheater 4-3, the 4th section is provided with the 6th connecting tube 21 Only valve 27；High temperature superheater 4-3 outlet is connected with collection vapour header 17 by the 7th connecting tube 22, and high temperature superheater 4-3's goes out Mouth is connected with water supply header 16 by the 8th connecting tube 23, and the 5th stop valve 28 is provided with the 7th connecting tube 22, described The 6th stop valve 29 is provided with 8th connecting tube 23；Water return pipeline 15 is connected with low temperature superheater 4-1, the water return pipeline 15 On be provided with the 7th stop valve 30；The 8th stop valve 31 is provided with saturated vapor export pipeline 14.It is so designed that, the 8th cut-off Switch of the valve 31 as control boiler saturated vapor, is opened under boiler steam-water dual-purpose type operating mode.Two the first stop valves 24 exist Need to open in the case of producing superheated steam.7th stop valve 30 is opened under steam-water dual-purpose type operating mode.

By controlling the stop valve on each pipeline, to realize boiler difference operating mode.When boiler steam-water dual-purpose type operating mode, 8th stop valve 31, the 7th stop valve 30, the 4th stop valve 27, the 6th stop valve 29 are opened, the cut-off of the first stop valve 24, second Valve 25, the 3rd stop valve 26, the 5th stop valve 28 are closed；In the case that boiler needs to produce superheated steam, the first stop valve 24th, the second stop valve 25, the 3rd stop valve 26, the 5th stop valve 28 are opened, the 8th stop valve 31, the 7th stop valve the 30, the 4th Stop valve 27, the 6th stop valve 29 are closed.Other compositions are identical with embodiment two with annexation.

Embodiment four：With reference to Fig. 1,2 explanation present embodiments, the first electric adjustable is additionally provided with water return pipeline 15 Valve 34 is saved, the both ends of first electric control valve 34 have been arranged in series the 9th stop valve 32, the first electric control valve 34 respectively It is arranged in parallel with two the 9th stop valves 32 with the 7th stop valve 30.It is so designed that, the first electric control valve 34 is used to adjust The flow of hot water under different load.Other compositions are identical with embodiment three with annexation.

Embodiment five：With reference to Fig. 1,2 explanation present embodiments, the is additionally provided with saturated vapor export pipeline 14 One electric gate valve 36.It is so designed that, is all the switch as control saturated vapor export pipeline 14 as the 8th stop valve 31, Difference to adapt to pipeline requires.Other compositions are identical with annexation with embodiment three or four.

Embodiment six：With reference to Fig. 1,2 explanation present embodiments, Attemperation water system 4-2 includes direct-contact desuperheater 4- 21 are arranged on the 5th connecting tube with desuperheat the water lines 4-22, the direct-contact desuperheater 4-21 being arranged on direct-contact desuperheater 4-21 On 20, be provided with the desuperheat water lines 4-22 the second electric control valve 35 and positioned at the both ends of the second electric control valve 35 Ten stop valves 33.It is so designed that, the second electric control valve 35 and the tenth stop valve 33 are used to desuperheat water loop, adjust superheater Vapor (steam) temperature, only just opened in the case where boiler produces superheated steam.Other compositions and annexation and embodiment five It is identical.

Embodiment seven：With reference to Fig. 1,2 explanation present embodiments, it is pre- that air preheater system 6 includes upper layer of air Hot device 6-1, middle level air preheater 6-2 and lower air preheater 6-3.It is so designed that, cold air passes through lower air successively Preheater 6-3, middle level air preheater 6-2, upper strata air preheater 6-1, form hot blast and enter buner system.Other compositions It is identical with embodiment one, two, three, four or six with annexation.

Embodiment eight：With reference to Fig. 1,2 explanation present embodiments, afterbody economizer system 5 includes lower floor's afterbody and saved Coal device 5-1 and upper strata afterbody economizer 5-2.It is so designed that, boiler feedwater flows through lower floor's afterbody by feed-water inlet 10 and saved successively Coal device 5-1, upper strata afterbody economizer 5-2 enter drum 1.Other compositions are identical with embodiment seven with annexation.

Claims (8)

1. A large steam-water dual-purpose boiler, characterized in that it includes a drum (1), a furnace (2), a furnace water wall (3), a superheater system (4), and a tail economizer system (5) and the air preheater system (6), in which the furnace (2), the superheater system (4), the tail economizer system (5) and the air preheater system (6) are connected in sequence, and the furnace water wall (3) The lower end is connected to the drum (1) through the downcomer (7), the upper end of the furnace water wall (3) is connected to the drum (1) through the first connecting pipe (8), and the drum (1), downcomer (7) , the furnace water wall (3), and the first connecting pipe (8) form a natural circulation loop, the lower part of the tail economizer system (5) is provided with a feedwater inlet (10), and the lower part of the air preheater system (6) is provided with The air inlet (11) and the flue gas outlet, the upper part of the air preheater system (6) is provided with a hot air outlet (13), and the upper part of the tail economizer system (5) is connected to the drum ( 1) connection, the drum (1) is also connected with a saturated steam outlet pipeline (14), the inlet of the superheater system (4) is connected with a return water pipeline (15), and the outlet of the superheater system (4) is connected with A water supply header (16) and a steam header (17) are arranged. 2. A large steam-water dual-purpose boiler according to claim 1, characterized in that: the superheater system (4) is arranged according to the boiler steam pressure, wherein the high-pressure parameter boiler is equipped with three sets of superheaters and two-stage desuperheating water system, three groups of superheaters are interspersed with two-stage desuperheating water systems for desuperheating to control the main steam temperature; medium pressure boilers are equipped with two-stage superheaters and one-stage desuperheating water systems, and one-stage desuperheater The warm water system desuperheats to control the main steam temperature; the low-pressure boiler is equipped with a primary superheater and a primary desuperheating water system. 3. A large steam-water dual-purpose boiler according to claim 2, characterized in that: when the steam pressure parameter of the boiler is medium pressure, the superheater system (4) includes a low-temperature superheater (4-1), The desuperheating water system (4-2) and the high-temperature superheater (4-3), the low-temperature superheater (4-1) and the drum (1) pass through the third connecting pipe (18) and the fourth connecting pipe arranged in parallel (19) connection, each of the third connecting pipe (18) and the fourth connecting pipe (19) is provided with a first cut-off valve (24); the low-temperature superheater (4-1) and the high-temperature superheater (4-3 ) are connected by the fifth connecting pipe (20) and the sixth connecting pipe (21) arranged in parallel, wherein the fifth connecting pipe (20) is provided with a desuperheating water system (4-2), and the desuperheating water system (4- 2) The fifth connecting pipe (20) between the low-temperature superheater (4-1) is provided with a second cut-off valve (25), between the desuperheating water system (4-2) and the high-temperature superheater (4-3) The third cut-off valve (26) is arranged on the fifth connecting pipe (20) between them, and the fourth cut-off valve (27) is arranged on the sixth connecting pipe (21); the outlet of the high-temperature superheater (4-3) passes through the The seven connecting pipes (22) are connected with the steam header (17), the outlet of the high temperature superheater (4-3) is connected with the water supply header (16) through the eighth connecting pipe (23), and the seventh connecting pipe ( 22) is provided with a fifth shut-off valve (28), and the eighth connecting pipe (23) is provided with a sixth shut-off valve (29); the return water pipeline (15) is connected to the low-temperature superheater (4-1), The seventh cut-off valve (30) is arranged on the return water pipeline (15); the eighth cut-off valve (31) is arranged on the saturated steam outlet pipeline (14). 4. A large steam-water dual-purpose boiler according to claim 3, characterized in that: a first electric regulating valve (34) is also provided on the return water pipeline (15), and the first electric regulating valve (34 ) are respectively arranged in series with a ninth shut-off valve (32), and the first electric control valve (34) and the two ninth shut-off valves (32) are all arranged in parallel with the seventh shut-off valve (30). 5. A large steam-water dual-purpose boiler according to claim 3 or 4, characterized in that: a first electric gate valve (36) is also provided on the saturated steam outlet pipeline (14). 6. A large steam-water dual-purpose boiler according to claim 5, characterized in that: the desuperheating water system (4-2) includes a water spray desuperheater (4-21) and is arranged on the water spray desuperheater ( 4-21) on the desuperheating water pipeline (4-22), the water spray desuperheater (4-21) is arranged on the fifth connecting pipe (20), and the desuperheating water pipeline (4-22) The second electric regulating valve (35) and the tenth shut-off valve (33) located at the two ends of the second electric regulating valve (35) are arranged on it. 7. A large steam-water dual-purpose boiler according to claim 1, 2, 3, 4 or 6, characterized in that: the air preheater system (6) includes an upper layer air preheater (6-1), Middle layer air preheater (6-2) and lower layer air preheater (6-3). 8. A large steam-water dual-purpose boiler according to claim 7, characterized in that: the tail economizer system (5) includes a lower tail economizer (5-1) and an upper tail economizer (5- 2).