CN206191630U

CN206191630U - Waste heat retrieval and utilization and steam temperature control system of boiler

Info

Publication number: CN206191630U
Application number: CN201621149162.2U
Authority: CN
Inventors: 赵志龙; 陆兵; 戚云峰
Original assignee: Wuxi Xianglong Environment Protection Technology Co Ltd
Current assignee: Wuxi Xianglong Environment Protection Technology Co Ltd
Priority date: 2016-10-22
Filing date: 2016-10-22
Publication date: 2017-05-24
Anticipated expiration: 2026-10-22

Abstract

The utility model relates to a waste heat retrieval and utilization and steam temperature control system of boiler, it can improve the temperature of the wind that gets into air heater, has avoided the corruption of cold wind to the air heater air -supply line, can avoid the waste of the energy and resource to the evacuation vapour source condensate water of oxygen -eliminating device recycle effectively simultaneously, has avoided environmental pollution, and heat transfer device installs before the forced draught blower in addition, has still played the effect of amortization to the fan, simultaneously the saturated steam of steam pocket and superheated steam's pressure differential are utilized to it, use saturated steam substitute subtract warm water and play to subtract the temperature to the boiler about to can make boiler life -span improve greatly, solve the great burst of tube of overheater who brings of the difference in temperature of desuperrheater and the problem that the desuperrheater damaged effectively.

Description

The residual heat recovery and Stream Temperature Control System of boiler

Technical field

The utility model is related to a kind of afterheat recycling system and Stream Temperature Control System, belongs to energy-conserving and environment-protective technical fiel.

Background technology

Need that cold wind is passed through in air preheater by blower fan in station boiler, Industrial Boiler, industrial furnace, air is pre- Hot device will send into boiler and use after cold air heating, but the pipe of the inlet side of air preheater is caused because long-time contacts cold wind Dewing corrosion, the time less than 2-3 will be corroded wears, and causes air preheater air leakage, causes air preheater to be changed frequent, inspection Repair relatively costly, simultaneously because equipped with multiple air preheaters on boiler, and installation site is higher, and the dismounting inconvenient repair time is long Shadow is produced.

Station boiler, Industrial Boiler, industrial furnace can produce waste gas, waste water, waste vapour, waste residue in industrial processes simultaneously Deng wherein containing substantial amounts of unemployed heat.Also needed by continuous blowdown and periodical blowdown in station boiler running Ensure that water quality meets demand for security in the stove of boiler, the feedwater into boiler must remove the oxygen in boiler, right to avoid The oxygen corrosion of steam generator system.Current thermal deaerator is the one preferred technique of station boiler, oxygen-eliminating device while work, evacuated tube Carry substantial amounts of low product steam secretly（About 120-160 degree）Enter air.

Contain substantial amounts of heat and excellent water quality in the platoon water of boiler-steam dome and the steam discharge of oxygen-eliminating device, if directly arranged Putting will cause the great energy and the wasting of resources, and extensive work steam enters air and environment can be polluted.

While boiler often occurs in the process of running, and Main Steam Temperature Control is improper to be caused boiler superheater tube booster and subtracts The damage of warm device header.The boiler of current China's production generally controls the outlet temperature of main steam using following several ways：

1st, using spray desuperheating method, control boiler steam temperature easily causes attemperator using the boiler of spray desuperheating method Header causes bead crack and pipe material inner wall to crack.Producing reason is exactly the feed temperature for Boiler Steam desuperheat （104℃）With the vapor (steam) temperature after desuperheat（540℃）The temperature difference is excessively big, the problems such as excessive temperature differentials can also cause superheater tubes burst.

2nd, face formula temp.-reducing method, both controlled main steam temperature, face formula desuperheat by non-contact attemperator with whole desuperheating waters The comparing that general miniature boiler is used is more, primary disadvantage is that：The main steam temperature regulation of boiler is insensitive.

3rd, make condensing spray desuperheating method by oneself, there is also the problems such as regulation is insensitive, and the temperature difference causes superheater tubes burst greatly.

The content of the invention

The purpose of this utility model is to overcome above-mentioned deficiency, there is provided a kind of residual heat recovery of boiler and control of steam temperature system System, can avoid air preheater corrosion of piping, air preheater service life be improved, while can be with energy saving, it is to avoid ring Pollute in border；It makes the boiler longevity using saturated vapor and the pressure difference of superheated steam using saturated vapor replacement desuperheating water desuperheat simultaneously Life is greatly improved, and efficiently solves the problem that the larger superheater tubes burst for bringing of the temperature difference and attemperator of attemperator are damaged.

What the purpose of this utility model was realized in：

The residual heat recovery and Stream Temperature Control System of a kind of boiler, it includes boiler, pre- equipped with multiple air on the boiler The blast pipe of hot device, wherein each air preheater is connected with blower fan, and the front end of blower fan is provided with heat-exchanger rig, the heat exchange Cold wind import, hot-blast outlet, the first hot water inlet, the first cooling water outlet, the second hot water inlet, the second cold water are offered on device Outlet, there is twice water service pipe inside heat-exchanger rig, be connected with the first hot water inlet, the first cooling water outlet respectively, and with the Two hot water inlets, the second cooling water outlet are connected, and first hot water inlet is connected with the evacuated tube on the oxygen-eliminating device of boiler, Second hot water inlet is connected with the outlet pipe of the platoon flash vessel of boiler-steam dome；

Be provided with drum in the boiler, the saturated vapor of the drum by saturated steam pipe pass-out, and with superheater One-level desuperheat pipe, two grades of desuperheat pipes are connected, and are provided with regulating valve on the one-level desuperheat pipe, two grades of desuperheat pipes to adjust saturation Quantity of steam.

The residual heat recovery and Stream Temperature Control System of the utility model boiler have advantages below：

The residual heat recovery and Stream Temperature Control System of this boiler are set up by between air preheater blast pipe and blower fan One heat-exchanger rig, and the outlet pipe of the evacuated tube of oxygen-eliminating device and the platoon flash vessel of drum is connected to the heat of heat-exchanger rig On water inlet, while cold wind is passed through the cold wind import of heat-exchanger rig, by the steam discharge and the platoon thermal source point of drum of oxygen-eliminating device Two sections exchange heat to cold wind, so as to improve the temperature of the wind of air inlet preheater, it is to avoid cold wind enters to air preheater The corrosion of airduct, while can effectively be recycled to the emptying vapour source condensate of oxygen-eliminating device, it is to avoid the energy and resource Waste, it is to avoid environmental pollution, before heat-exchanger rig is arranged on pressure fan in addition, also serve the effect of noise reduction to blower fan.

It substitutes desuperheating water to pot using the saturated vapor of drum and the pressure difference of superheated steam using saturated vapor simultaneously Stove plays desuperheat or so, such that it is able to greatly improve boiler life, efficiently solves the larger mistake brought of the temperature difference of attemperator The problem that hot device booster and attemperator are damaged.

Brief description of the drawings

Fig. 1 is the residual heat recovery of the utility model boiler and the structural representation of Stream Temperature Control System.

Fig. 2 is the connection enlarged drawing of air preheater, blower fan and heat-exchanger rig in Fig. 1.

Fig. 3 is the annexation figure of boiler internal drum and superheater in Fig. 1.

In figure：Boiler 1, air preheater 2, blast pipe 3, blower fan 4, heat-exchanger rig 5, cold wind import 6, hot-blast outlet 7, One hot water inlet 8, the first cooling water outlet 9, the second hot water inlet 10, the second cooling water outlet 11, oxygen-eliminating device 12, evacuated tube 13, company Row's flash vessel 14, outlet pipe 15, drum 16, saturated steam pipe 17, superheater 18,19, two grades of desuperheat pipes 20 of one-level desuperheat pipe, tune Section valve 21.

Specific embodiment

Referring to Fig. 1 to Fig. 3, the utility model is related to the residual heat recovery and Stream Temperature Control System of a kind of boiler, including boiler 1, equipped with multiple air preheaters 2 on the boiler 1, the wherein blast pipe 3 of each air preheater 2 is connected with blower fan 4, wind The front end of machine 4 is provided with heat-exchanger rig 5, cold wind import 6, hot-blast outlet 7, the first hot water is offered on the heat-exchanger rig 5 and is entered The 8, first cooling water outlet 9 of mouth, the second hot water inlet 10, the second cooling water outlet 11, there is twice water service pipe inside heat-exchanger rig 5, point It is not connected with the first hot water inlet 8, the first cooling water outlet 9, and is connected with the second hot water inlet 10, the second cooling water outlet 11 Logical, first hot water inlet 8 is connected with the evacuated tube 13 on the oxygen-eliminating device 12 of boiler 1, second hot water inlet 10 and The outlet pipe 15 of the platoon flash vessel 14 of the drum of boiler 1 is connected, and so the hot water by oxygen-eliminating device and drum is pre- to being blown into air Cold wind is exchanged heat in hot device, so as to improve the temperature of the wind of air inlet preheater, it is to avoid cold wind enters to air preheater The corrosion of airduct, while can effectively be recycled to the heat of oxygen-eliminating device and drum, it is to avoid the energy and resource Waste, it is to avoid environmental pollution, before heat-exchanger rig is arranged on pressure fan in addition, also serve the effect of noise reduction to blower fan.

Be provided with drum 16 in the boiler 1, the saturated vapor of the drum 16 by the pass-out of saturated steam pipe 17, and with mistake 19, two grades of desuperheat pipes 20 of one-level desuperheat pipe of hot device 18 are connected, and are provided with 19, two grades of desuperheat pipes 20 of the one-level desuperheat pipe Regulating valve 21 adjusts saturated vapor amount.

Just can so utilize the saturated vapor of drum with the pressure difference of superheated steam, desuperheating water is substituted using saturated vapor Desuperheat or so is played to boiler, such that it is able to greatly improve boiler life, the temperature difference for efficiently solving attemperator larger is brought Superheater tubes burst and attemperator damage problem.

Claims

1. the residual heat recovery and Stream Temperature Control System of a kind of boiler, it is characterised in that：It includes boiler（1）, the boiler（1）On Equipped with multiple air preheaters（2）, wherein each air preheater（2）Blast pipe（3）And blower fan（4）It is connected, blower fan（4） Front end be provided with heat-exchanger rig（5）, the heat-exchanger rig（5）On offer cold wind import（6）, hot-blast outlet（7）, first heat Water inlet（8）, the first cooling water outlet（9）, the second hot water inlet（10）, the second cooling water outlet（11）, heat-exchanger rig（5）Inside has Twice water service pipe, respectively with the first hot water inlet（8）, the first cooling water outlet（9）Be connected, and with the second hot water inlet （10）, the second cooling water outlet（11）It is connected, first hot water inlet（8）With boiler（1）Oxygen-eliminating device（12）On emptying Pipe（13）It is connected, second hot water inlet（10）With boiler（1）The platoon flash vessel of drum（14）Outlet pipe（15）Phase Connection；

The boiler（1）In be provided with drum（16）, the drum（16）Saturated vapor pass through saturated steam pipe（17）Pass-out, and With superheater（18）One-level desuperheat pipe（19）, two grades of desuperheat pipes（20）It is connected, the one-level desuperheat pipe（19）, two grades of desuperheats Pipe（20）On be provided with regulating valve（21）To adjust saturated vapor amount.