Heat recovery system for water replenishment of glass waste heat boiler drainage heating deaerator

Abstract

The utility model provides a heat recovery system for heating replenished water of a deaerator by drainage of a glass waste heat boiler, which comprises the deaerator and a steam pocket which are sequentially arranged on at least one production line along the flowing direction of the replenished water of the deaerator, the deaerator is used for deoxidizing the replenished water of the deaerator, and the steam pocket is used for conveying steam to the deaerator to carry out steam heating on the replenished water of the deaerator; a waste heat and sewage outlet of the steam pocket is communicated with a heat source inlet of the heat exchanger, and a heat source outlet is externally connected with waste heat and sewage utilization equipment; the heat exchanger is provided with at least one heat source inlet; a water inlet pipeline for water supplement of the deaerator is sequentially communicated with a cold source inlet and a cold source outlet of the heat exchanger, a first straight-through valve is arranged between the water inlet pipeline and a connector of the cold source inlet and a connector of the cold source outlet, the water inlet pipeline is communicated with the inlet of the deaerator, and the connector communicated with the inlet of the deaerator is arranged on the downstream of the connector of the cold source outlet. Waste heat sewage exchanges heat with the deaerator replenishment water, and the deaerator replenishment water subjected to heat exchange enters the deaerator from the water inlet pipeline.

Description

Technical Field

[0001] The utility model relates to the field of heat recovery of drainage water of a glass waste heat boiler, in particular to a heat recovery system for heating water replenishment of a deaerator of a glass waste heat boiler. Background Art

[0002] The glass kiln waste heat boiler mainly recovers most of the heat energy in the medium and low temperature waste gas emitted by the glass kiln. It heats the water to a certain temperature through the furnace tube heat exchanger to generate superheated steam, which is finally sent to the steam turbine generator set for continuous output of power generation load.

[0003] In order to maintain a certain salt content and conductivity of boiler water in the glass industry and prevent excessive salt concentration from affecting steam quality and electrochemical corrosion of the inner wall of the heat exchange tube, the waste heat boiler in the glass industry uses boiler continuous pipes to continuously draw saturated water with high salt content from the steam drum and discharge it into the "blowing expansion tank".

[0004] After this part of waste heat sewage led out from the steam drum enters the sewage expansion tank, a part of it is discharged upward through the method of reducing pressure and expanding the volume to disappear into the atmosphere, and the other part forms hydrophobic water with a temperature of nearly 100°C and is discharged downward into the ditch. Therefore, the discharge of waste heat sewage led out from the steam drum will cause a large amount of heat and water resources to be wasted.

[0005] At present, in order to recycle this part of the continuous discharge wastewater, the steam generated by the sewage expansion tank is mainly recovered to the deaerator for heating. However, due to the high temperature of the drain water, it is directly discharged or recovered to the circulating water pool. Figure 1 .

[0006] However, the existing recycling process still has shortcomings: (1) The separated wastewater still retains a relatively high temperature, but is directly discharged or recycled into a circulating water tank, resulting in a large amount of heat loss. (2) Direct discharge of wastewater also wastes water resources, while recycling it into a circulating water tank affects the cooling effect of the circulating water. (3) The need to control the liquid level of the sewage expansion tank increases the difficulty of operation and the workload. Utility Model Content

[0007] The utility model provides a heat recovery system for heating water replenishment of a deaerator using drainage water from a glass waste heat boiler, which can solve the problems in the background technology.

[0008] The utility model provides a heat recovery system for heating deaerator feed water by draining water from a glass waste heat boiler, comprising a deaerator and a steam drum arranged in sequence along the flow direction of the deaerator feed water on at least one production line, wherein the deaerator deoxygenates the deaerator feed water, and the steam drum transports steam to the deaerator to steam-heat the deaerator feed water;

[0009] It also includes a heat exchanger, wherein the waste heat and sewage outlet of the drum is connected to the heat source inlet of the heat exchanger, and the heat source outlet is externally connected to a waste heat and sewage utilization device; the heat exchanger is provided with at least one heat source inlet;

[0010] The water inlet pipe for replenishing water for the deaerator is connected to the cold source inlet and the cold source outlet of the heat exchanger in sequence, respectively. A first straight-through valve is provided between the connection ports of the water inlet pipe with the cold source inlet and the cold source outlet. The water inlet pipe is connected to the deaerator inlet, and the connection port connected to the deaerator inlet is provided downstream of the cold source outlet connection port.

[0011] The waste heat sewage exchanges heat with the deaerator feed water, and the deaerator feed water after heat exchange enters the deaerator from the water inlet pipe.

[0012] In some embodiments, the waste heat and sewage utilization equipment is a desulfurization process water tank.

[0013] In some embodiments, a blowdown expansion tank is further included, wherein the drum waste heat sewage outlet is connected to a three-way valve, a first outlet of the three-way valve is connected to the heat source inlet, and a second outlet of the three-way valve is connected to the blowdown expansion tank.

[0014] In some embodiments, a second through valve is provided between the water inlet pipe and the cold source inlet, and a third through valve is provided between the water inlet pipe and the cold source outlet.

[0015] In some embodiments, the recovery system includes deaerators and steam drums on two production lines, two heat source inlets are provided on the heat exchanger, and the waste heat and sewage outlets of the steam drums on the two production lines are respectively connected to the two heat source inlets on the heat exchanger.

[0016] In some embodiments, the water inlet pipe is connected to the deaerator inlets of the two production lines respectively.

[0017] In some embodiments, a blowdown expansion tank is further included, wherein the waste heat and sewage outlets of the two steam drums are respectively connected to three-way valves, the first outlets of the two three-way valves are respectively connected to the two heat source inlets of the heat exchanger, and the second outlets of the two three-way valves are respectively connected to the blowdown expansion tank.

[0018] In some embodiments, the heat exchanger is a shell and tube heat exchanger.

[0019] In some embodiments, the waste heat sewage enters the shell of the shell and tube heat exchanger from the heat source inlet and goes through the shell pass.

[0020] In some embodiments, the deaerator feed water enters the heat exchange tubes of the shell and tube heat exchanger from the cold source inlet and flows through the tube path.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The utility model discharges the waste heat sewage generated by the drum into the heat exchanger to heat the deaerator feed water. On the one hand, the heat of the waste heat sewage can be used to heat the deaerator feed water before it enters the deaerator, which can reduce the amount of steam input from the drum to the deaerator and reduce energy consumption; on the other hand, the temperature of the waste heat sewage is reduced after heat exchange, and then it is recycled to avoid heat loss and avoid affecting the cooling effect of the circulating water; at the same time, the heat exchanger does not need to control the liquid level, which reduces the operation difficulty and running workload. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the existing drum waste heat and sewage recycling;

[0024] Figure 2 Schematic diagram of the heat recovery system of Example 1;

[0025] Figure 3 This is a schematic diagram of the heat exchanger of Example 1;

[0026] Figure 4 This is a side sectional view of the heat exchanger of Example 1.

[0027] 1. Line 7 deaerator; 2. Line 7 steam drum; 3. Line 8 deaerator; 4. Line 8 steam drum; 5. Heat exchanger; 51. Line 8 heat source inlet; 52. Line 7 heat source inlet; 53. Cold source outlet; 54. Cold source inlet; 55. Heat source outlet; 56 Heat exchanger pipe; 6. Blowdown expansion tank; 7. Desulfurization process water tank; 8. First straight-through valve; 9. Third straight-through valve; 10. Second straight-through valve; 11. Fourth straight-through valve; 12. Fifth straight-through valve. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connection" can be a wall-mounted connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Example 1

[0032] Reference Figures 1 to 4 This embodiment provides a heat recovery system for heating deaerator feed water with drainage water from a glass waste heat boiler, comprising a 7-line deaerator 1 and a 7-line steam drum 2 arranged sequentially along the flow direction of the deaerator feed water on the 7-line production line, and an 8-line deaerator 3 and an 8-line steam drum 4 arranged sequentially along the flow direction of the deaerator feed water on the 8-line production line. The 7-line deaerator 1 and the 8-line deaerator 3 deoxygenate the deaerator feed water, and the 7-line steam drum 2 and the 8-line steam drum 4 respectively transport steam to the 7-line deaerator 1 and the 8-line deaerator 3 to steam-heat the deaerator feed water; an inlet water pipe for the deaerator feed water is connected to the inlet of the 7-line deaerator 1 and the 8-line deaerator 3 to feed water to the deaerator.

[0033] It also includes a shell and tube heat exchanger 5, which is provided with two heat source inlets. The waste heat and sewage outlets of the 7-line steam drum 2 and the 8-line steam drum 4 are respectively connected to the 7-line heat source inlet 52 and the 8-line heat source inlet 51 on the heat exchanger 5; the heat source outlet 55 is externally connected to the waste heat and sewage utilization equipment;

[0034] The cold source inlet 54 and the cold source outlet 53 of the heat exchanger 5 are successively connected to the water inlet pipe. A first straight-through valve 8 is provided between the water inlet pipe and the connection ports with the cold source inlet 54 and the cold source outlet 53. The connection port of the water inlet pipe connected to the inlets of the 7-line deaerator 1 and the 8-line deaerator 3 is provided downstream of the connection port of the cold source outlet 53.

[0035] After closing first through-valve 8, deaerator feed water flows through the water inlet pipe from the cold source inlet 54 of heat exchanger 5 into heat exchange tubes 56 of heat exchanger 5 and flows through the tube side. Simultaneously, waste heat wastewater from drum 2 (line 7) and drum 4 (line 8) enters the shell of heat exchanger 5 from the two heat source inlets and flows through the shell side. The waste heat wastewater in the shell side exchanges heat with the deaerator feed water in the tube side. The deaerator feed water temperature rises, flows out of cold source outlet 53, and finally flows through the water inlet pipe into deaerator 1 (line 7) and deaerator 3 (line 8). The waste heat wastewater in the shell side cools down and flows out of heat source outlet 55 to an external waste heat wastewater utilization device. In this embodiment, the waste heat wastewater utilization device is the desulfurization process water tank 7 in the desulfurization process.

[0036] In existing glass manufacturing processes, a complete recovery system with a blowdown expansion vessel 6 is often already in place. Specifically, the deaerator feed water enters the 7-line deaerator 1 and the 8-line deaerator 3 directly without being heated. Steam from the 7-line steam drum 2 and the 8-line steam drum 4 heats the water to the required process temperature. The waste heat wastewater from the 7-line steam drum 2 and the 8-line steam drum 4 is then directly and continuously discharged to the blowdown expansion vessel 6. Through pressure reduction and expansion, the steam is vented upward and disappears into the atmosphere, while the remaining waste heat wastewater is discharged into the sewer.

[0037] Therefore, dismantling the blowdown expansion vessel 6 of the original system and rebuilding a new one would increase costs. Therefore, in this embodiment, the heat exchanger 5 is connected to the process route by connecting a three-way valve to the waste heat and sewage outlet of the drum, eliminating the need to dismantle the blowdown expansion vessel 6. Specifically, three-way valves are connected to the waste heat and sewage outlets of the 7-line drum 2 and the 8-line drum 4. The first outlet of the three-way valve is connected to the heat source inlet of the heat exchanger 5, and two fourth straight-through valves 11 are installed in the pipeline between the first outlet and the heat source inlet. The second outlet of the three-way valve is connected to the blowdown expansion vessel 6, and two fifth straight-through valves 12 are installed in the pipeline between the second outlet and the blowdown expansion vessel 6.

[0038] When recovering waste heat, opening the fourth straight-through valve 11 between the steam drum and the heat exchanger 5 and closing the fifth straight-through valve 12 between the steam drum and the sewage expansion tank 6 can allow the waste heat and sewage from the 7-line steam drum 2 and the 8-line steam drum 4 to flow to the heat exchanger 5 for heat exchange.

[0039] At the same time, two second through valves 10 are provided between the water inlet pipe and the cold source inlet 54, and two third through valves 9 are provided between the water inlet pipe and the cold source outlet 53. By switching the first through valve 8, the second through valve 10, the third through valve 9, the fourth through valve 11, and the fifth through valve 12, the heat exchanger 5 and the blowdown expansion tank 6 can be switched.

[0040] For example, when the heat exchanger 5 is connected to the system, the heat exchange of the heat exchanger 5 can be achieved by closing the first straight-through valve 8, opening the second straight-through valve 10 and the third straight-through valve 9, opening the fourth straight-through valve 11, and closing the fifth straight-through valve 12.

[0041] The original recovery system can be restored by opening the fifth through valve 12, closing the fourth through valve 11, opening the first through valve 8, and closing the second through valve 10 and the third through valve 9.

[0042] When the original system was implemented, the deaerator feed water with a normal temperature of 32°C was directly passed through the water inlet pipe and then branched into two routes to the 7-line deaerator 1 and the 8-line deaerator 3 respectively. The two deaerators were heated by 180°C steam input from the 7-line steam drum 2 and the 8-line steam drum 4 respectively to maintain the deaerator water tank temperature at 146°C; the waste heat wastewater temperature of the 7-line steam drum 2 and the 8-line steam drum 4 reached 100°C, which was difficult to recycle and was directly discharged into the ditch.

[0043] Through the heat recovery system of this embodiment, the deaerator feed water, at a normal temperature of 32°C, bypasses the first straight-through valve 8. The cold source inlet 54 leading to the heat exchanger 5 undergoes heat exchange within the heat exchanger 5 tube pass. The temperature of the deaerator feed water flowing out of the cold source outlet 53 of the heat exchanger 5 can be raised to 60°C. The water then flows through two branches of the water inlet pipe to the 7-line deaerator 1 and the 8-line deaerator 3, respectively. At this point, the amount of 180°C steam delivered by the 7-line steam drum 2 and the 8-line steam drum 4 can be reduced due to the increased deaerator feed water temperature, thereby saving energy costs.

[0044] At the same time, the waste heat wastewater from drums 2 of line 7 and drums 4 of line 8 exchanges heat with the deaerator feed water in the shell side of heat exchanger 5, utilizing the heat of the waste heat wastewater. Simultaneously, the waste heat wastewater's temperature is reduced to approximately 50°C before being further recycled from the outlet of heat exchanger 5 to desulfurization process water tank 7. Therefore, the heat recovery system of this embodiment avoids the resource and energy waste associated with conventional waste heat wastewater treatment processes using blowdown expansion tanks 6.

[0045] As a simple alternative in this embodiment, the number of production lines is not limited to 2.

[0046] The above is only a preferred specific implementation method of the present invention, but the design concept of the present invention is not limited to this. Any technician familiar with the technical field who uses this concept to make non-substantial changes to the present invention within the technical scope disclosed by the present invention shall be deemed to infringe the protection scope of the present invention.

Claims

1. A heat recovery system for heating deaerator water supply by draining water from a glass waste heat boiler, characterized in that: It includes a deaerator and a steam drum arranged in sequence along the flow direction of the deaerator feed water on at least one production line, wherein the deaerator deoxygenates the deaerator feed water, and the steam drum transmits steam to the deaerator to steam heat the deaerator feed water; It also includes a heat exchanger, wherein the waste heat and sewage outlet of the drum is connected to the heat source inlet of the heat exchanger, and the heat source outlet is externally connected to a waste heat and sewage utilization device; the heat exchanger is provided with at least one heat source inlet; The water inlet pipe for replenishing water for the deaerator is connected to the cold source inlet and the cold source outlet of the heat exchanger in sequence, respectively. A first straight-through valve is provided between the connection ports of the water inlet pipe with the cold source inlet and the cold source outlet. The water inlet pipe is connected to the deaerator inlet, and the connection port connected to the deaerator inlet is provided downstream of the cold source outlet connection port. The waste heat sewage exchanges heat with the deaerator feed water, and the deaerator feed water after heat exchange enters the deaerator from the water inlet pipe.

2. The heat recovery system for heating deaerator water replenishment by drain water of glass waste heat boiler according to claim 1 is characterized in that: The waste heat and sewage utilization equipment is a desulfurization process water tank.

3. The heat recovery system for heating deaerator water replenishment by drain water of glass waste heat boiler according to claim 1 is characterized in that: It also includes a blowdown expansion tank, the drum waste heat and sewage outlet is connected to a three-way valve, the first outlet of the three-way valve is connected to the heat source inlet, and the second outlet of the three-way valve is connected to the blowdown expansion tank.

4. The heat recovery system for heating deaerator water replenishment by drain water of a glass waste heat boiler according to claim 1 is characterized in that: A second through valve is provided between the water inlet pipe and the cold source inlet, and a third through valve is provided between the water inlet pipe and the cold source outlet.

5. The heat recovery system for heating deaerator water replenishment by drain water of a glass waste heat boiler according to claim 1 is characterized in that: The recovery system includes deaerators and steam drums on two production lines. Two heat source inlets are provided on the heat exchanger. The waste heat and sewage outlets of the steam drums on the two production lines are respectively connected to the two heat source inlets on the heat exchanger.

6. The heat recovery system for heating deaerator water replenishment by drain water from a glass waste heat boiler according to claim 5 is characterized in that: The water inlet pipeline is communicated with the deaerator inlets of the two production lines respectively.

7. The heat recovery system for heating deaerator water replenishment by drain water from a glass waste heat boiler according to claim 5 is characterized in that: It also includes a sewage expansion tank, the waste heat and sewage outlets of the two steam drums are respectively connected to three-way valves, the first outlets of the two three-way valves are respectively connected to the two heat source inlets of the heat exchanger, and the second outlets of the two three-way valves are respectively connected to the sewage expansion tank.

8. The heat recovery system for heating deaerator replenishment water using waste water from a glass waste heat boiler according to any one of claims 1 to 7, wherein the heat exchanger is a shell and tube heat exchanger.

9. The heat recovery system for heating deaerator water replenishment by drain water from a glass waste heat boiler according to claim 8, characterized in that: The waste heat sewage enters the shell of the shell and tube heat exchanger from the heat source inlet and goes through the shell process.

10. The heat recovery system for heating deaerator water replenishment using waste heat boiler water of glass according to claim 8, characterized in that: The deaerator make-up water enters the heat exchange tubes of the shell and tube heat exchanger from the cold source inlet and travels through the tube path.

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