Drainage heating deaerator water replenishing energy-saving system for glass production waste heat boiler

Abstract

The utility model discloses a water-replenishing energy-saving system for heating a deaerator by discharged water of a waste heat boiler for producing glass, and an energy-saving method for recovering heat of discharged water of the waste heat boiler and heating the replenished water of the deaerator is realized by arranging a heat exchanger instead of a traditional blowdown flash tank. The heat exchanger is provided with heat source medium inlets matched with the glass production lines in number, and steam drum continuous blowdown of the waste heat boiler serves as a shell pass of a heat source medium passing through the heat exchanger; inlet water of the water supplementing mother pipe serves as a cold source medium to flow through the tube pass of the heat exchanger and serves as supplemented water to flow into a deaerator of the glass production line after being heated. The glass kiln waste heat power generation system is simple and practical in design, solves the problem of waste of heat energy and water resources, achieves the purposes of reducing cost and increasing efficiency by recovering heat to improve power generation efficiency and reduce water consumption, and can be popularized and used.

Description

TECHNICAL FIELD

[0001] The utility model belongs to glass kiln waste heat power generation technical field, concretely relates to a kind of production glass waste heat boiler drainage heating deaerator water replenishing energy-saving system. BACKGROUND

[0002] Glass kiln waste heat boiler is mainly used to recycle most of heat energy in low-temperature waste flue gas discharged by glass kiln, and through furnace tube heat exchanger, water is heated to a certain temperature, and superheated steam is generated, which is finally sent to steam turbine generator set for continuous output of power generation load.Glass industry waste heat boiler is used to maintain a certain salt content and electrical conductivity of furnace water, prevent salt concentration from being too high to affect steam quality and electrochemical corrosion of inner wall of heat exchange tube, and adopt continuous drainage pipe of boiler to continuously draw out saturated water with high salt content from steam drum, which is discharged into "continuous drainage expansion vessel", part of which forms steam into deaerator (deaerator needs heating steam with temperature of 200 DEG C, after heating, the content of dissolved oxygen in water is about 9mg / L at normal temperature and pressure, and after thermal deaeration, the content of dissolved oxygen in water can be lower than 15ug / L, and water with reduced oxygen content after deaerator is used to return to waste heat boiler to supplement water amount;Another part of "continuous drainage expansion vessel" forms drain water with temperature of nearly 100 DEG C, which is discharged into ditch, and this part of discharge will cause a large amount of heat and water resource waste.

[0003] In prior art, continuous drainage waste water recovery mode includes introducing continuous drainage water into external heating pipe network, mainstream recovery mode is to recycle steam into deaerator for heating use through continuous drainage expansion vessel, and drain water is directly discharged or recycled into circulating water pool. Figure 1 Continuous drainage waste water is discharged into "continuous drainage expansion vessel", and unqualified water is separated into secondary steam and drain water (waste heat water) through pressure reduction and expansion.The secondary steam generated by continuous drainage expansion vessel contains certain heat about 200 DEG C, which is introduced into the top of deaerator, so that this part of heat can be used to heat feed water entering deaerator.This prior art has the following deficiencies: (1) separated waste heat water still retains high temperature and is directly discharged or recycled into circulating water pool, so that a large amount of heat energy is still lost.(2) Direct discharge of waste water will also cause water resource waste, and if recycled into circulating water pool, it will affect cooling effect of circulating water.(3) Liquid level of continuous drainage expansion vessel needs to be controlled, which increases operation difficulty and operation workload. UTILITY MODEL CONTENTS

[0004] The utility model aims at overcoming the deficiencies of prior art, and provides a kind of production glass waste heat boiler drainage heating deaerator water replenishing energy-saving system, which solves the problems in the above background technology.

[0005] The utility model discloses a technical scheme that solves its technical problem is: provide a kind of production glass waste heat boiler drainage heating deaerator water replenishment energy-saving system, heat recovery is carried out to waste heat boiler drainage by being equipped with heat exchanger and is used to heat deaerator water replenishment;The heat exchanger is equipped with the heat source medium entrance that matches with the quantity of glass production line, and the shell side of heat exchanger is walked by the continuous blowdown of the steam pocket of waste heat boiler as heat source medium;The water inlet of water replenishment main pipe is as cold source medium and walks the tube side of heat exchanger, and after temperature rise, as water replenishment, flows into the deaerator of glass production line.

[0006] In a preferred embodiment of the utility model, the continuous blowdown of the steam pocket of the waste heat boiler is cooled by the heat exchanger and then recovered to the desulfurization process water tank.

[0007] In a preferred embodiment of the utility model, each heat exchanger is adapted to two glass production lines, and each glass production line is provided with one waste heat boiler.

[0008] In a preferred embodiment of the utility model, a tee joint is welded between the primary valve and the secondary valve of the continuous blowdown pipeline of the steam pocket of the two glass production lines, and the pipeline is respectively connected to the heat source medium entrance of the heat exchanger.

[0009] In a preferred embodiment of the utility model, the water replenishment main pipe is connected to the water inlet pipeline and the backwater pipeline of the heat exchanger in sequence, the water inlet pipeline and the backwater pipeline are respectively provided with isolation valves, and the water replenishment main pipe is provided with a straight-through valve between the connection positions of the water inlet pipeline and the backwater pipeline.

[0010] In a preferred embodiment of the utility model, the heat exchanger is provided with two heat source medium entrances and is also provided with a heat source medium outlet, a cold source medium entrance and a cold source medium outlet.

[0011] In a preferred embodiment of the utility model, the heat source medium entrance is provided with a pressure measuring point, and the cold source medium entrance and the cold source medium outlet are provided with temperature measuring points.

[0012] In a preferred embodiment of the utility model, the heat exchanger comprises a stainless steel heat exchange pipe and a shell, and the heat exchange area of the stainless steel heat exchange pipe is not less than 20 square meters.

[0013] In a preferred embodiment of the utility model, the waste heat boiler is used in a glass kiln waste heat power generation system.

[0014] Compared with the background art, the technical scheme has the following advantages:

[0015] The utility model solves the problem that the waste heat can not be completely recycled in the traditional recycling process (the waste heat drainage of the traditional recycling mode is still nearly 100 DEG C, and the utility model can reduce the temperature of the waste water to below 50 DEG C). The water supplement in the utility model system is supplemented into the deaerator after being heated by heat exchange, the steam amount of the steam drum to the deaerator can be reduced, thereby the steam amount of the steam turbine is increased, the power generation load of the generator is improved, the waste heat water is discharged after being greatly reduced by heat exchange, and is recycled to the desulfurization process water tank for use, the water consumption of the desulfurization process is reduced, and the technical effects of water and electricity saving are achieved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic diagram of existing continuous drainage waste heat recovery.

[0017] Figure 2 It is a waste heat power generation process flow diagram of the boiler continuous drainage.

[0018] Figure 3 It is a system schematic diagram using the blow-off expansion vessel;

[0019] Figure 4 It is a system schematic diagram using the heat exchanger;

[0020] Figure 5 It is a heat exchanger structure diagram;

[0021] Figure 6 It is a heat exchanger sectional view one;

[0022] Figure 7 It is a heat exchanger sectional view two.

[0023] Among them, ①7 line heat source medium inlet, ②8 line heat source medium inlet, ③ cold source medium inlet, ④ cold source medium outlet, ⑤ stainless steel heat exchange pipe, ⑥ heat source medium outlet, ⑦ thermometer interface, ⑧ pressure gauge interface. DETAILED DESCRIPTION

[0024] The following is combined with the drawings and examples, wherein the waste heat waste heat recovery system is set up by taking the "Zhang glass 7# and 8# glass production line" of our factory as an example, and the technical scheme of the utility model is described in detail by comparing the blow-off expansion vessel and the heat exchanger system.

[0025] Each production line of our factory has a corresponding waste heat boiler. 7# and 8# production line (because two boilers are adjacent, if they are independently set, the construction cost will be increased, and the workshop site will be increased) share a "heat exchanger", and after sharing, the operation of the heat exchanger can not be affected by the water supplement or blow-off interruption of one of the boilers, and one heat exchanger can be saved. Do not consider three or more float glass production lines sharing a "heat exchanger", because the continuous drainage pipeline and the water supplement pipeline of the third production line boiler are too long, the pipe resistance is increased, the power consumption of the water pump is increased, the long distance temperature drop loss is more uneconomical.

[0026] As Figure 3 Before the implementation of the utility model scheme, the pollution discharge expander is used in the 7# and 8# glass production lines of Zhangzhou Glass, 32 DEG C water is supplied from the water supply main pipe and then branched into two paths to the 7# and 8# oxygen removal devices, the two oxygen removal devices are heated by the steam from the steam drum at 180 DEG C respectively, and the temperature of the oxygen removal water tank is kept at 146 DEG C; the 7# and 8# steam drums continuously discharge waste water at 0.5t / h respectively, the internal saturated water temperature is 180 DEG C, and the waste water directly flows to the pollution discharge expander for steam exhaust and ground drainage.

[0027] The water supply amount is related to the design capacity of the boiler, and the total amount of the 7# and 8# glass production lines of the factory is 16t / h. In addition, the power generation process principle of the waste heat boiler is as follows Figure 2 The steam drum of the waste heat boiler is connected with an economizer, an evaporator and a superheater, the superheater is connected with a steam turbine for supplying energy to a generator, the exhaust steam of the steam turbine is connected to a condenser through a pipeline, the condensate pipeline of the condenser is connected to an oxygen removal device, and the oxygen removal device is connected to the economizer through a feedwater pipeline. The content of dissolved oxygen in water at normal temperature and pressure is about 9mg / L, and the content of dissolved oxygen in water after thermal deoxidization by the oxygen removal device can be less than 15ug / L. The water with reduced oxygen content flows to the boiler body for water, and then to the economizer, the steam drum and each evaporator in turn, realizing waste heat recycling, and being suitable for the glass kiln waste heat power generation system.

[0028] Embodiment

[0029] The embodiment is a water supply energy-saving system for a waste heat boiler of a glass production line, which replaces the original pollution discharge expander with a heat exchanger to recycle the heat of the waste heat boiler and use it for heating water supply of the oxygen removal device. The heat exchanger is provided with a number of heat source medium inlets matched with the number of glass production lines, and the continuous pollution discharge of the steam drum of the waste heat boiler is used as the heat source medium in the shell side of the heat exchanger. The water inlet of the water supply main pipe is used as the cold source medium in the tube side of the heat exchanger, and the heated water is used as the water supply to the oxygen removal device of the glass production line.

[0030] In the embodiment, the continuous pollution discharge of the steam drum of the waste heat boiler is cooled by the heat exchanger and then recycled to a desulfurization process water tank, and is specifically used for high-pressure atomizing water of an environmental protection semi-dry desulfurization tower, without actual influence, without affecting the desulfurization effect, and without increasing the calcium-sulfur ratio.

[0031] Each heat exchanger is adapted to two glass production lines, and each glass production line is provided with a waste heat boiler. The continuous pollution discharge pipelines of the steam drums of the two glass production lines are welded with a tee joint between a primary valve and a secondary valve, and the pipelines are respectively connected to the heat source medium inlets of the heat exchangers. The water supply main pipe is connected to the water inlet pipeline and the backwater pipeline of the heat exchanger in turn, the water inlet pipeline and the backwater pipeline are respectively provided with isolation valves, and the water supply main pipe is provided with a straight-through valve between the connection positions of the water inlet pipeline and the backwater pipeline.

[0032] The heat exchanger is provided with two heat source medium inlets ① and ②, and is also provided with a heat source medium outlet ⑥, a cold source medium inlet ③ and a cold source medium outlet ④. The heat source medium inlets ① and ② are provided with pressure measuring points and pressure gauge interfaces ⑧; the cold source medium inlet ③ and the cold source medium outlet ④ are provided with temperature measuring points and thermometer interfaces ⑦. The continuous blowdown pipeline of the steam drum of the waste heat boiler is connected to the heat source medium inlets ① and ② of the heat exchanger, and the cold source medium inlet ③ and the cold source medium outlet ④ are respectively connected to the main feedwater pipe.

[0033] The heat exchanger comprises a stainless steel heat exchange pipe ⑤ and a shell, and the heat exchange area of the stainless steel heat exchange pipe ⑤ is not less than 20㎡. The stainless steel heat exchange pipe ⑤ is made of S304 stainless steel material, and the remaining materials are made of Q345R material.

[0034] As shown in Figure 4 As shown in the figure, 32℃ make-up water flows from the make-up water main pipe to the heat exchanger through the bypass valve, and the temperature of the make-up water is raised to 60℃, and then the make-up water is branched into two paths after returning to the make-up water main pipe, and the two paths are respectively connected to the 7# line deaerator and the 8# line deaerator. The 180℃ heating steam supplied by the steam drum to the deaerator is adjusted by 0.4t / h, and the temperature of the deaerator water tank is maintained at 146℃; the continuous blowdown waste water of the 7# line steam drum and the 8# line steam drum is 0.5t / h per drum, and the internal saturated water temperature is 180℃. The waste water is diverted to the heat exchanger through the three-way pipeline, and the temperature of the waste water is reduced to 47.2℃ through heat exchange, and then the waste water is recovered to the "desulfurization process water tank", and the desulfurization system reduces the amount of tap water make-up by 1t / h.

[0035] Table 1

[0036]

[0037] Benefit calculation: The steam supply amount of the steam drum is saved by about 0.4t / h, and according to the steam consumption rate of the generator set of 5.8kg / kW.h, the excess steam is used for power generation, which can increase the power generation load by 69KW. The waste water is recovered after temperature reduction, and 24t of water is saved per day. Annual income = 69*24*365*0.52+24*365*3.2 = 342,300 yuan.

[0038] The investment cost of the case is only 89,000 yuan, which solves the problems of waste of heat energy and water resources, and improves the power generation efficiency by recovering heat and reduces water consumption to achieve the purpose of reducing cost and increasing benefit. The design process scheme can be popularized and used in the glass kiln waste heat power generation system.

[0039] The above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An energy-saving system for heating deaerator makeup water from waste heat boilers used in glass production, characterized in that: The system includes a glass production line and a heat exchanger; the glass production line is equipped with a waste heat boiler; the heat exchanger is provided with a heat source medium inlet, a heat source medium outlet, a cold source medium inlet, and a cold source medium outlet, which are matched with the number of glass production lines; the continuous blowdown pipeline of the steam drum of the waste heat boiler is connected to the heat source medium inlet of the heat exchanger; and the cold source medium inlet and cold source medium outlet are respectively connected to the water supply header.

2. The energy-saving system for waste heat boiler drainage heating deaerator makeup water in glass production according to claim 1, characterized in that: The heat source medium outlet is connected to the desulfurization process water tank.

3. The energy-saving system for waste heat boiler drainage heating deaerator makeup water in glass production according to claim 1, characterized in that: Each heat exchanger is adapted to two glass production lines, and each glass production line has a waste heat boiler.

4. The energy-saving system for waste heat boiler drainage heating deaerator makeup water in glass production according to claim 3, characterized in that: A tee is welded between the primary and secondary valves of the continuous blowdown pipeline of the steam drum of the two glass production lines, and the pipeline is led to the heat source medium inlet of the heat exchanger.

5. The energy-saving system for waste heat boiler drainage heating deaerator makeup water in glass production according to claim 1, characterized in that: The water supply header is sequentially connected to the inlet water pipe and the return water pipe of the heat exchanger. The inlet water pipe and the return water pipe are respectively equipped with isolation valves. The water supply header is equipped with a straight-through valve between the inlet water pipe and the return water pipe.

6. The energy-saving system for waste heat boiler drainage heating deaerator makeup water in glass production according to claim 1, characterized in that: The heat source medium inlet is equipped with a pressure gauge interface, and the cold source medium inlet and cold source medium outlet are equipped with thermometer interfaces.

7. The energy-saving system for waste heat boiler drainage heating deaerator makeup water in glass production according to claim 1, characterized in that: The heat exchanger includes stainless steel heat exchange tubes and a shell, and the heat exchange area of ​​the stainless steel heat exchange tubes is not less than 20㎡.

8. The energy-saving system for waste heat boiler drainage heating deaerator makeup water in glass production according to claim 7, characterized in that: The stainless steel heat exchange tube is made of 304 stainless steel, and the outer shell is made of Q345R material.

9. The energy-saving system for water replenishment of a waste heat boiler in glass production, as described in claim 1, is characterized in that: The waste heat boiler's steam drum is connected to an economizer, an evaporator, and a superheater.

10. The energy-saving system for waste heat boiler drainage heating deaerator makeup water in glass production according to claim 9, characterized in that: The superheater is connected to a steam turbine for supplying power to the generator. The exhaust steam from the steam turbine is connected to the condenser via a pipeline. The condensate water pipeline of the condenser is connected to the deaerator. The deaerator is connected to the economizer via a feedwater pipeline.

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