Complete sets of equipment for heat transfer oil waste heat conversion steam system and its usage method

Abstract

The present invention relates to the technical field of waste heat recovery and utilization, in particular to a complete set of equipment for converting waste heat of heat transfer oil into steam and its use method. The complete set of equipment for converting waste heat of heat transfer oil into steam includes a heat exchange system, a water treatment system, a heat transfer oil conveying system, and a steam treatment system. The heat exchange system includes a steam generator and a water heater communicated with the steam generator. A heat transfer oil conveying pipe is arranged in the steam generator, and the end of the heat transfer oil conveying pipe is communicated with the inner cavity of the water heater. A water body conveying pipe is arranged in the water heater, and the end of the water body conveying pipe is communicated with the inner cavity of the steam generator; the heat transfer oil conveying system includes a heat transfer oil inlet, a three-way temperature control valve, and a heat transfer oil outlet. The heat transfer oil inlet is communicated with the three-way temperature control valve, the three-way temperature control valve is communicated with the steam generator, and the heat transfer oil outlet is communicated with the water heater; the water treatment system is communicated with the water heater, and the steam treatment system is communicated with the steam generator. The present invention fully recovers the heat of high-temperature heat transfer oil and reasonably utilizes the waste heat.

Description

Technical Field

[0001] The present invention relates to the technical field of waste heat recovery and utilization, and in particular to a complete set of equipment for converting waste heat of heat-conducting oil into steam and its usage method. Background Art

[0002] In order to ensure that the main girder does not deform in the high-temperature area inside the industrial furnace kiln, heat-conducting oil is used for cooling. The surplus heat generated therefrom uses the heat-conducting oil as a heat carrier, and outside the kiln, the heat-conducting oil is cooled by means of air cooling. The air cooler is equipped with an electric fan to blow the heat of the heat-conducting oil into the surrounding air, wasting both electric energy and heat.

[0003] Chinese Patent Application CN107606957A discloses a waste heat recovery system for heat-conducting oil of a beam-type lime kiln, which includes a lime kiln. An upper combustion beam and a lower combustion beam are arranged inside the lime kiln. A heat-conducting oil cooling system is arranged in cooperation with the upper combustion beam and the lower combustion beam. Among them, the heat-conducting oil cooling system includes a circulation pipeline connected between the upper combustion beam and the lower combustion beam. An air cooler and a heat-conducting oil circulation pump are connected to the circulation pipeline. Both ends of the air cooler are connected with an evaporator through an evaporation pipeline, and the evaporator is connected with a steam generating set through a steam pipeline. The above-mentioned waste heat recovery system for heat-conducting oil of the beam-type lime kiln evaporates the waste heat of the heat-conducting oil through the evaporator, and sends the high-temperature steam into the steam generating set for power generation and reuse, saving emissions and protecting the environment, and reducing the production cost of the enterprise to a certain extent.

[0004] The above-mentioned ordinary waste heat recovery and utilization system still has many deficiencies. For example: (1) The equipment structure is complex, the waste heat recovery of high-temperature heat-conducting oil is insufficient, and the waste heat utilization is unreasonable; (2) It cannot adjust the flow direction of the heat-conducting oil according to the actual situation, and cannot timely adjust the flow rate of the heat-conducting oil and the flow rate of the waste heat recovery product. Summary of the Invention

[0005] The purpose of the present invention is to provide a complete set of equipment for converting waste heat of heat-conducting oil into steam and its usage method, to overcome the deficiencies of the foregoing prior art, with simple structure and equipment, sufficient recovery of the heat of high-temperature heat-conducting oil, reasonable waste heat utilization, adjusting the flow direction of the heat-conducting oil according to the actual situation, and timely adjusting the flow rates of each component in the system.

[0006] The technical solution adopted by the present invention to solve its technical problems is:

[0007] A complete set of equipment for converting waste heat of heat-conducting oil into steam includes a heat exchange system, a water treatment system, a heat-conducting oil delivery system, and a steam treatment system, wherein:

[0008] The heat exchange system includes a steam generator and a water heater connected to the steam generator. A heat transfer oil delivery pipe is arranged in the steam generator, and the end of the heat transfer oil delivery pipe is connected to the inner cavity of the water heater. A water body delivery pipe is arranged in the water heater, and the end of the water body delivery pipe is connected to the inner cavity of the steam generator;

[0009] The heat transfer oil delivery system includes a heat transfer oil inlet, a three-way temperature control valve, and a heat transfer oil outlet. The heat transfer oil inlet is connected to the three-way temperature control valve, the three-way temperature control valve is connected to the steam generator, and the heat transfer oil outlet is connected to the water heater;

[0010] The water treatment system is connected to the water heater, and the steam treatment system is connected to the steam generator.

[0011] Further, the water treatment system includes a water inlet, a water softening device, a water softening tank, and a feed pump group connected in sequence. The water softening device is provided with a sewage discharge pipe, the water softening tank is provided with a condensate water inlet pipe, and the feed pump group is connected to the water body delivery pipe of the water heater through a pipeline.

[0012] Further, a liquid level detector is arranged on the water softening tank, and a solenoid valve and a water meter flowmeter are arranged on the water inlet. The liquid level detector is electrically connected to the solenoid valve of the water inlet, and the solenoid valve is electrically connected to the water meter flowmeter.

[0013] Further, a liquid level detector is arranged on the steam generator, and the liquid level detector is electrically connected to the feed pump group.

[0014] Further, a heat transfer oil flow detector, a heat transfer oil temperature detector, and a heat transfer oil pressure detector are arranged on the pipeline where the three-way temperature control valve is connected to the steam generator. The third interface of the three-way temperature control valve is connected to the start end of the first branch, and the end of the first branch is connected to the heat transfer oil outlet. A heat transfer oil flow detector, a heat transfer oil temperature detector, and a heat transfer oil pressure detector are also arranged on the heat transfer oil delivery pipe between the steam generator and the water heater. The heat transfer oil delivery pipe between the steam generator and the water heater is connected to the start end of the second branch, and the end of the second branch is connected to the heat transfer oil outlet.

[0015] Further, the steam treatment system includes a steam discharge pipeline, a steam separator, and a steam delivery pipeline. One end of the steam discharge pipeline is connected to the steam outlet of the steam generator, and the other end is connected to the steam separator. A plurality of steam delivery pipelines are arranged at intervals on the steam separator.

[0016] Further, an evaporator liquid level detector, a steam temperature detector, a steam pressure detector, and a steam flow detector are arranged on both the steam discharge pipeline and the steam delivery pipeline.

[0017] Further, both the heat transfer oil delivery pipe and the water body delivery pipe are spiral pipes.

[0018] Furthermore, blowdown pipes are provided on the steam generator, water heater, and steam separation drum. The sewage generated by the water softening equipment, steam generator, water heater, and steam separation drum is discharged into the blowdown tank. The blowdown tank is equipped with a liquid level detector, and when the liquid level is reached, the submersible sewage pump is automatically started to empty the sewage in the blowdown tank.

[0019] A method for using a complete set of equipment for a heat transfer oil waste heat conversion steam system includes the following steps:

[0020] (1) Water treatment route: The water body is treated by a water softening device and then enters the soft water tank for storage. The stored water body is sent into the water delivery pipe of the water heater by a water supply pump group for preheating. The preheated water body enters the inner cavity of the steam generator to produce steam.

[0021] (2) Heat transfer oil treatment route: The original heat transfer oil pipeline of the industrial furnace kiln generation system is connected to the heat transfer oil inlet. The heat transfer oil enters the heat transfer oil delivery pipe of the steam generator through a three-way temperature control valve. The heat transfer oil exchanges heat with the water body in the inner cavity of the steam generator through the heat transfer oil delivery pipe to produce steam, realizing the first heat release of the heat transfer oil. The heat transfer oil enters the water heater through the heat transfer oil delivery pipe and exchanges heat with the water body in the water delivery pipe in the inner cavity of the water heater, realizing the second heat release of the heat transfer oil and preheating the water body in the water delivery pipe. After the second heat release is completed, the heat transfer oil returns to the original heat transfer oil pipeline of the industrial furnace kiln generation system through the heat transfer oil outlet and returns to the original process through an air cooler.

[0022] (3) Steam treatment route: The steam generated in the steam generator enters the steam separation drum and is dispersed into each steam delivery pipeline through the steam separation drum, and is input into an external branch system through the steam delivery pipeline for application.

[0023] Furthermore, when the heat exchange system is deactivated or there is surplus heat inside the heat exchange system, the heat transfer oil is directly introduced into the original heat transfer oil pipeline of the industrial furnace kiln generation system through the three-way temperature control valve and the first branch, and returns to the original process through an air cooler; when there is surplus heat in part of the water heater, the amount of heat transfer oil entering the water heater is controlled.

[0024] The beneficial effects of the present invention are as follows: Compared with the prior art, a complete set of equipment for a heat transfer oil waste heat conversion steam system and its usage method of the present invention have the following advantages: (1) In the present invention, the flow direction of the heat transfer oil is opposite to that of the water body. The high-temperature heat transfer oil enters the steam generator and contacts the preheated water body, releasing heat for the first time and quickly generating steam. Then it enters the water heater, releasing heat for the second time to preheat the normal-temperature water body in the water heater. The preheated water body then enters the steam generator, and the heat transfer oil flows along the spiral heat transfer oil conveying pipe in the steam generator. At this time, the water body that has been preheated and entered the steam generator is in the inner cavity of the steam generator. When the heat transfer oil enters the water heater and fills the inner cavity of the water heater, the water body waiting to be preheated flows along the spiral water body conveying pipe. This setting method greatly prolongs the heat exchange time, improves the heat exchange effect, recovers waste heat more fully, and protects the water heater and the steam generator from damage; (2) Adjust the flow direction of the heat transfer oil according to the actual situation, and timely adjust the flow rates of each component in the system. When the heat exchange system is shut down or there is surplus heat inside the heat exchange system, the heat transfer oil is directly introduced into the original heat transfer oil pipeline of the industrial furnace kiln generation system through the three-way temperature control valve and the first branch, and then returns to the original process through the air cooler; when there is surplus heat in the water heater, control the amount of heat transfer oil entering the water heater. The steam generated by waste heat recovery utilization is dispersed into each steam conveying pipeline through the steam separator, and is input into the external branch system through the steam conveying pipeline for application, making the utilization more reasonable. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 FIG. is a schematic structural diagram of a complete set of equipment for a heat transfer oil waste heat conversion steam system of the present invention;

[0026] Among them, 1 is the steam generator, 2 is the water heater, 3 is the heat transfer oil conveying pipe, 4 is the water body conveying pipe, 5 is the heat transfer oil inlet, 6 is the three-way temperature control valve, 7 is the heat transfer oil outlet, 8 is the water inlet, 9 is the water softening equipment, 10 is the soft water tank, 11 is the feed pump group, 12 is the sewage pipeline, 13 is the condensate water inlet pipeline, 14 is the first branch, 15 is the second branch, 16 is the steam discharge pipeline, 17 is the steam separator, and 18 is the steam conveying pipeline. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0028] Embodiment 1 A complete set of equipment for a heat transfer oil waste heat conversion steam system

[0029] As Figure 1 shown in the embodiment, a complete set of equipment for a heat transfer oil waste heat conversion steam system includes a heat exchange system, a water treatment system, a heat transfer oil conveying system, and a steam treatment system, wherein:

[0030] The heat exchange system includes a steam generator 1 and a water heater 2 connected to the steam generator 1. A heat transfer oil delivery pipe 3 is arranged in the steam generator 1, and the end of the heat transfer oil delivery pipe 3 communicates with the inner cavity of the water heater 2. A water body delivery pipe 4 is arranged in the water heater 2, and the end of the water body delivery pipe 4 communicates with the inner cavity of the steam generator 1;

[0031] The heat transfer oil delivery system includes a heat transfer oil inlet 5, a three-way temperature control valve 6 and a heat transfer oil outlet 7. The heat transfer oil inlet 5 is connected to the three-way temperature control valve 6, the three-way temperature control valve 6 is connected to the steam generator 1, and the heat transfer oil outlet 7 is connected to the water heater 2;

[0032] The water treatment system is connected to the water heater 2, and the steam treatment system is connected to the steam generator 1.

[0033] In this embodiment, the water treatment system includes a water inlet 8, a water softening device 9, a water softening tank 10 and a feed pump group 11 connected in sequence. The water softening device 9 is provided with a sewage discharge pipe 12, the water softening tank 10 is provided with a condensate water inlet pipe 13, and the feed pump group 11 is connected to the water body delivery pipe 4 of the water heater 2 through a pipeline.

[0034] In this embodiment, a liquid level detector is arranged on the water softening tank 10, and a solenoid valve and a water meter flowmeter are arranged on the water inlet 8. The liquid level detector is electrically connected to the solenoid valve of the water inlet 8, and the solenoid valve is electrically connected to the water meter flowmeter.

[0035] In this embodiment, a liquid level detector is arranged on the steam generator 1, and the liquid level detector is electrically connected to the feed pump group 11.

[0036] In this embodiment, a heat transfer oil flow detector, a heat transfer oil temperature detector and a heat transfer oil pressure detector are arranged on the pipeline where the three-way temperature control valve 6 is connected to the steam generator 1. The third interface of the three-way temperature control valve 6 communicates with the start end of the first branch 14, and the end of the first branch 14 communicates with the heat transfer oil outlet 7. A heat transfer oil flow detector, a heat transfer oil temperature detector and a heat transfer oil pressure detector are also arranged on the heat transfer oil delivery pipe 3 between the steam generator 1 and the water heater 2. The heat transfer oil delivery pipe 3 between the steam generator 1 and the water heater 2 communicates with the start end of the second branch 15, and the end of the second branch 15 communicates with the heat transfer oil outlet 7.

[0037] In this embodiment, the steam treatment system includes a steam discharge pipeline 16, a steam separator 17 and a steam delivery pipeline 18. One end of the steam discharge pipeline 16 communicates with the steam outlet of the steam generator 1, and the other end communicates with the steam separator 17. A plurality of steam delivery pipelines 18 are arranged at intervals on the steam separator 17.

[0038] In this embodiment, an evaporator liquid level detector, a steam temperature detector, a steam pressure detector, and a steam flow detector are all provided on the steam discharge pipeline 16 and the steam delivery pipeline 18.

[0039] In this embodiment, the heat transfer oil delivery pipe 3 and the water body delivery pipe 4 are both spiral pipes.

[0040] In this embodiment, blowdown pipelines 12 are provided on the steam generator 1, the water heater 2, and the steam separator 17. The sewage generated by the water softening device 9, the steam generator 1, the water heater 2, and the steam separator 17 is discharged into the blowdown tank. The blowdown tank is equipped with a liquid level detection. When the liquid level is reached, the submersible sewage pump is automatically started to empty the sewage in the blowdown tank. The scientific ability intelligent adjustment technology is adopted to automatically adjust the operation parameters of the scientific and technological product equipment, realizing the remote system function.

[0041] Embodiment 2 A method for using a complete set of equipment for a heat transfer oil waste heat conversion steam system

[0042] A method for using a complete set of equipment for a heat transfer oil waste heat conversion steam system includes the following steps:

[0043] (1) Water treatment route: The water body is subjected to water quality treatment by the water softening device and then enters the soft water tank 10 for storage. The stored water body is sent into the water body delivery pipe 4 of the water heater 2 by the water supply pump group 11 to be preheated. The preheated water body enters the inner cavity of the steam generator 1 to generate steam.

[0044] (2) Heat transfer oil treatment route: The original heat transfer oil pipeline of the industrial furnace kiln production system is connected to the heat transfer oil inlet 5. The heat transfer oil enters the heat transfer oil delivery pipe 3 of the steam generator 1 through the three-way temperature control valve 6. The heat transfer oil exchanges heat with the water body in the inner cavity of the steam generator 1 through the heat transfer oil delivery pipe 3 to generate steam, realizing the first heat release of the heat transfer oil. The heat transfer oil enters the water heater 2 through the heat transfer oil delivery pipe 3 and exchanges heat with the water body in the water body delivery pipe 4 in the inner cavity of the water heater 2, realizing the second heat release of the heat transfer oil and preheating the water body in the water body delivery pipe 4. After the second heat release is completed, the heat transfer oil returns to the original heat transfer oil pipeline of the industrial furnace kiln production system through the heat transfer oil outlet 7 and returns to the original process after connecting to the air cooler.

[0045] (3) Steam treatment line: The steam generated in the steam generator 1 enters the steam separator 17 and is dispersed into each steam delivery pipeline 18 through the steam separator 17, and is input into the external branch system through the steam delivery pipeline 18 for application.

[0046] In this embodiment, when the heat exchange system is deactivated or there is surplus heat inside the heat exchange system, the heat-conducting oil is directly introduced into the original heat-conducting oil pipeline of the industrial furnace kiln production system through the three-way temperature control valve 6 and the first branch 14, and then returns to the original process through the air cooler; when there is surplus heat in part of the water heater 2, the amount of heat-conducting oil entering the water heater 2 is controlled.

[0047] The above specific implementation manners are only specific cases of the present invention. The patent protection scope of the present invention includes but is not limited to the product forms and styles of the above specific implementation manners. Any appropriate changes or modifications made by any person skilled in the art who meets the claims of the present invention shall fall within the patent protection scope of the present invention.

Claims

1. A complete set of equipment for a heat transfer oil waste heat conversion steam system, characterized in that: It includes a heat exchange system, a water treatment system, a heat transfer oil delivery system, and a steam treatment system, where: The heat exchange system includes a steam generator and a water heater connected to the steam generator. A heat transfer oil delivery pipe is arranged in the steam generator, and the end of the heat transfer oil delivery pipe is communicated with the inner cavity of the water heater. A water body delivery pipe is arranged in the water heater, and the end of the water body delivery pipe is communicated with the inner cavity of the steam generator; The heat transfer oil delivery system includes a heat transfer oil inlet, a three-way temperature control valve, and a heat transfer oil outlet. The heat transfer oil inlet is communicated with the three-way temperature control valve, the three-way temperature control valve is communicated with the steam generator, and the heat transfer oil outlet is communicated with the water heater; The water treatment system is communicated with the water heater, and the steam treatment system is communicated with the steam generator; On the pipeline where the three-way temperature control valve is communicated with the steam generator, there are arranged a heat transfer oil flow detector, a heat transfer oil temperature detector, and a heat transfer oil pressure detector. The third interface of the three-way temperature control valve is communicated with the start end of the first branch, and the end of the first branch is communicated with the heat transfer oil outlet. On the heat transfer oil delivery pipe between the steam generator and the water heater, there are also arranged a heat transfer oil flow detector, a heat transfer oil temperature detector, and a heat transfer oil pressure detector. The heat transfer oil delivery pipe between the steam generator and the water heater is communicated with the start end of the second branch, and the end of the second branch is communicated with the heat transfer oil outlet; The steam treatment system includes a steam discharge pipeline, a steam separator, and a steam delivery pipeline. One end of the steam discharge pipeline is communicated with the steam outlet of the steam generator, and the other end is communicated with the steam separator. A number of steam delivery pipelines are arranged on the steam separator at intervals; On both the steam discharge pipeline and the steam delivery pipeline, there are arranged an evaporator liquid level detector, a steam temperature detector, a steam pressure detector, and a steam flow detector.

2. The complete set of equipment for a heat transfer oil waste heat conversion steam system according to claim 1, characterized in that: The water treatment system includes a water inlet, a water softening device, a soft water tank, and a feed pump group connected in sequence. The water softening device is provided with a sewage discharge pipeline, the soft water tank is provided with a condensate water inlet pipeline, and the feed pump group is communicated with the water body delivery pipe of the water heater through a pipeline.

3. The complete set of equipment for a heat transfer oil waste heat conversion steam system according to claim 2, characterized in that: A liquid level detector is arranged on the soft water tank, and a solenoid valve and a water meter flowmeter are arranged on the water inlet. The liquid level detector is electrically connected to the solenoid valve of the water inlet, and the solenoid valve is electrically connected to the water meter flowmeter.

4. A complete set of equipment for a heat transfer oil waste heat conversion steam system according to claim 2, characterized in that: A liquid level detector is arranged on the steam generator, and the liquid level detector is electrically connected to the feed pump group.

5. The complete set of equipment for a heat transfer oil waste heat conversion steam system according to claim 1, characterized in that: Both the heat transfer oil delivery pipe and the water body delivery pipe are spiral pipes.

6. The usage method of a complete set of equipment for a heat transfer oil waste heat conversion steam system according to any one of claims 1-5, characterized in that: It includes the following steps: (1) Water treatment route: The water body is subjected to water quality treatment by a water softening device and then enters the soft water tank for storage. The stored water body is sent by the feed pump group to the water body delivery pipe of the water heater for preheating. The preheated water body enters the inner cavity of the steam generator to produce steam; (2) Heat transfer oil treatment route: The original heat transfer oil pipeline of the industrial furnace kiln generation system is connected to the heat transfer oil inlet. The heat transfer oil enters the heat transfer oil delivery pipe of the steam generator through a three-way temperature control valve. The heat transfer oil exchanges heat with the water body in the inner cavity of the steam generator through the heat transfer oil delivery pipe to generate steam, realizing the first heat release of the heat transfer oil. The heat transfer oil enters the water heater through the heat transfer oil delivery pipe, exchanges heat with the water body in the water delivery pipe in the inner cavity of the water heater, realizes the second heat release of the heat transfer oil, and pre-heats the water body in the water delivery pipe. After the second heat release is completed, the heat transfer oil returns to the original heat transfer oil pipeline of the industrial furnace kiln generation system through the heat transfer oil outlet and returns to the original process after connecting to the air cooler; (3) Steam treatment line: The steam generated in the steam generator enters the steam distribution header, is dispersed into each steam delivery pipeline through the steam distribution header, and is input into the external branch system through the steam delivery pipeline for application.

7. The usage method of a complete set of equipment for a heat transfer oil waste heat conversion steam system according to claim 6, characterized in that: When the heat exchange system is deactivated or there is excess heat inside the heat exchange system, the heat transfer oil is directly introduced into the original heat transfer oil pipeline of the industrial furnace kiln generation system through the three-way temperature control valve and the first branch, and returns to the original process after connecting to the air cooler; when there is excess heat in the water heater, the amount of heat transfer oil entering the water heater is controlled.

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