Steam boiler desalination and descaling system and operation method thereof
By setting up a desalination scaler and heating structure in the steam boiler system, the purified sewage is vaporized and pressurized, and the scaling problem of boiler system is solved, production efficiency and safety are improved, and safety hazards and pipeline pressure losses are reduced. .
Patent Information
- Application Number
- CN201811497123.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2018-12-07
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2038-12-07
AI Technical Summary
The prior art cannot effectively solve the problems of scaling, salting out and pipeline blockage in the boiler system and its rear section pipeline, resulting in safety hazards and production interference.
A steam boiler desalting and scale reduction system is designed, including boiler, desalting and scale reduction device, heating structure and pressurization device. By setting up a desalting and scale reduction device at the upstream of the boiler, the purified sewage is vaporized and concentrated before entering the boiler. , the high-pressure hot steam is introduced into the desalination and scale-down device by using the heating structure and the booster device to heat and pressurize the purified sewage, forming high-pressure steam into the boiler, and the concentrated brine enters the drying plant for drying, avoiding the boiler's interior. Scale.
It effectively solves the scaling and blocking problems of boiler system and its rear pipeline, reduces the safety hazards of pipe bursting, improves production efficiency, extends the pump inspection cycle, reduces the leakage of filler lubricants of the oil pump, and improves the Inject steam overheating and effect.
Smart Images
Figure CN111285481B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of boiler desalination and scaling reduction systems, and in particular to a steam boiler desalination and scaling reduction system and an operating method thereof. Background Art
[0002] In the process of heavy oil extraction, hot steam injection is often used for extraction. Oil fields now generally use steam generating equipment such as wet steam boilers and superheated boilers to produce steam. If the boiler water is heavy oil purified wastewater, because it contains a large amount of sodium salts, calcium salts, dissolved silicon and other salts, after the heavy oil purified wastewater enters the boiler, it will be converted into steam in the boiler, which is easy to produce salt precipitation and scaling in the boiler system, causing blockage of the system and affecting normal production, and posing safety hazards.
[0003] Currently available patents all use the salt-containing steam generated by the sewage purification boiler for cleaning, or desalinate the concentrated brine generated by the boiler, which cannot solve the scaling problem of the boiler as a whole. For example, Chinese Patent Publication No. CN103968359A provides "a boiler and a method for producing superheated steam using naturally circulating high-salt feed water"; Chinese Patent Publication No. CN101979917A provides a "natural circulation steam injection boiler and a water circulation method using high-salt softened water as feed water"; Chinese Patent Publication No. CN103968365A provides a "method and device for producing superheated steam using high-salt boiler feed water by staged evaporation"; Chinese Patent Publication No. CN104276614A provides a "method for desalting a direct current steam injection boiler"; Chinese Patent Publication No. CN106610011A provides a "desalting device and a steam desalting device for superheated steam injection boilers in oil fields"; Chinese Patent Publication No. CN104266175A provides a "superheated steam desalting device for superheated boilers for oil field steam injection and a method of using the same", etc., none of which can solve the scaling problem of the boiler as a whole.
[0004] In summary, it is not difficult to find that the prior art has problems of scaling, salting and clogging of the boiler system and its downstream pipelines. Summary of the invention
[0005] The main purpose of the present invention is to provide a steam boiler desalination and descaling system and an operation method thereof, so as to solve the problems of scaling, salting out and pipeline blockage in the boiler system and its downstream pipelines in the prior art.
[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a steam boiler desalination and descaling system is provided, comprising: a boiler; a desalination and descaling device, the desalination and descaling device is located at an upstream position of the boiler, and the steam port of the desalination and descaling device is connected to the steam inlet of the boiler; a heating structure, the heating structure has a separator and a heat exchange return pipeline, and the inlet of the separator is connected to the steam discharge port of the boiler, and the separator is connected to the desalination and descaling device through the heat exchange return pipeline, so as to introduce the high-pressure hot steam generated by the boiler into the desalination and descaling device and heat the purified sewage; a booster device, the booster device boosts the steam entering the boiler.
[0007] Furthermore, the steam boiler desalination and descaling system further comprises a discharge pipeline, which is connected to the lower part of the desalination and descaling device.
[0008] Furthermore, the steam port of the desalination and descaling device is located at the upper part of the desalination and descaling device.
[0009] Furthermore, the steam boiler desalination and descaling system also includes a purified sewage inlet pipeline, which is connected to the desalination and descaling device and has a first connection point, and the heat exchange return pipeline has a second connection point with the desalination and descaling device.
[0010] Furthermore, the steam boiler desalination and scale reduction system also includes an air injection pipeline, which is connected to the separator.
[0011] Furthermore, the steam boiler desalination and descaling system also includes a salt content detector for detecting the salt content of the liquid in the desalination and descaling device, and when the salt content detected by the salt content detector is greater than a preset value, the discharge pipeline is enabled.
[0012] Furthermore, the steam boiler desalination and scale reduction system also includes a prompt device, which is connected to the salt content detector. When the salt content detected by the salt content detector is greater than a preset value, the salt content detector sends a signal to the prompt device to make the prompt device alarm. The discharge pipeline is provided with an electric switch valve or a manual switch valve. When the discharge pipeline is provided with a manual switch valve, the staff opens the manual switch valve according to the alarm prompt of the prompt device.
[0013] Furthermore, the steam boiler desalination and scale reduction system also includes: multiple desalination and scale reduction devices, and the multiple desalination and scale reduction devices are arranged in parallel or in series to inject steam into the boiler respectively; multiple valves, and the multiple valves are arranged one-to-one with the multiple desalination and scale reduction devices to control the connection status between the corresponding desalination and scale reduction devices and the boiler.
[0014] According to another aspect of the present invention, there is provided an operation method of a steam boiler desalination and scale reduction system, and production is carried out using the above-mentioned steam boiler desalination and scale reduction system. The operation method comprises: an initial operation stage, in which purified sewage is injected into a desalination and scale reduction device of the steam boiler desalination and scale reduction system, part of the purified sewage enters a boiler of the steam boiler desalination and scale reduction system through the desalination and scale reduction device for heating, steam generated after heating enters a separator of the steam boiler desalination and scale reduction system, and flows back to the desalination and scale reduction device through a heat exchange return pipeline of the steam boiler desalination and scale reduction system to heat the purified sewage in the desalination and scale reduction device; when the liquid level of the purified sewage in the desalination and scale reduction device is lower than the connection point between the heat exchange return pipeline and the desalination and scale reduction device, the steam boiler desalination and scale reduction system enters a normal steam production stage.
[0015] Furthermore, the operation method also includes: when the salt content detector in the desalter and descaling device detects that the salt content of the liquid in the desalter and descaling device is greater than a preset value, the discharge pipeline of the steam boiler desalter and descaling system is activated.
[0016] Applying the technical solution of the present invention, the steam boiler desalination and descaling system in the present application includes a boiler, a desalination and descaling device, a heating structure and a pressurizing device. The desalination and descaling device is located at the upstream position of the boiler, and the steam port of the desalination and descaling device is connected to the steam inlet of the boiler; the heating structure has a separator and a heat exchange return pipeline, and the inlet of the separator is connected to the steam discharge port of the boiler, and the separator is connected to the desalination and descaling device through the heat exchange return pipeline to introduce the high-pressure hot steam generated by the boiler into the desalination and descaling device and heat the purified sewage; the pressurizing device pressurizes the steam entering the boiler.
[0017] When using the steam boiler desalination and descaling system of the above structure, the purified sewage is first vaporized and concentrated by the desalination and descaling device before entering the boiler. In the desalination and descaling device, the purified sewage is converted into vaporized steam and concentrated brine by the heating structure. The vaporized steam is discharged from the desalination and descaling device and enters the booster device to be converted from low-pressure steam to high-pressure steam, or condensed to water, and enters the boiler after being pressurized. The concentrated brine is discharged from the desalination and descaling device and then enters the spray drying plant in the entire boiler system for drying, thereby achieving the purpose of desalination and descaling of purified sewage. In the steam boiler desalination and descaling system, the cooperation of the desalination and descaling device and the heating structure allows the purified sewage to be desalted and descaled before entering the boiler, thereby solving the problem of scale formation inside the boiler caused by purified sewage directly entering the boiler. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:
[0019] Figure 1A schematic diagram of a flow chart of a steam boiler desalination and descaling system according to a specific embodiment of the present invention is shown;
[0020] The above drawings include the following reference numerals:
[0021] 10. Boiler; 20. Desalination and descaling device; 30. Heating structure; 31. Separator; 32. Heat exchange reflux pipeline; 40. Discharge pipeline; 50. Purified sewage liquid pipeline; 60. Gas injection pipeline; 70. Pressurization device. DETAILED DESCRIPTION
[0022] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0023] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.
[0024] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.
[0025] In order to solve the problems of scaling, salting out and pipeline blockage in the boiler system and its downstream pipelines in the prior art, the present application provides a steam boiler desalination and scaling reduction system and an operation method thereof.
[0026] The steam boiler desalination and descaling system in the present application includes a boiler, a desalination and descaling device, a heating structure and a pressure boosting device. The desalination and descaling device is located at the upstream position of the boiler, and the steam port of the desalination and descaling device is connected to the steam inlet of the boiler; the heating structure has a separator and a heat exchange return pipeline, and the inlet of the separator is connected to the steam discharge port of the boiler, and the separator is connected to the desalination and descaling device through the heat exchange return pipeline to introduce the high-pressure hot steam generated by the boiler into the desalination and descaling device and heat the purified sewage; the pressure boosting device pressurizes the steam entering the boiler.
[0027] When the steam boiler desalination and descaling system of the above structure is used, the purified sewage is first vaporized and concentrated by the desalination and descaling device 20 before entering the boiler 10. In the desalination and descaling device 20, the purified sewage is converted into vaporized steam and concentrated brine by the heating structure 30. The vaporized steam is discharged from the desalination and descaling device 20 and enters the booster device 70 to be converted from low-pressure steam to high-pressure steam, or condensed to water, and enters the boiler 10 after being pressurized. The concentrated brine is discharged from the desalination and descaling device 20 and then enters the spray drying plant in the entire boiler system for drying, thereby achieving the purpose of desalination and descaling of the purified sewage. In the steam boiler desalination and descaling system, the cooperation of the desalination and descaling device 20 and the heating structure 30 allows the purified sewage to be desalted and descaled before entering the boiler 10, thereby solving the problem of the purified sewage directly entering the boiler 10 and causing scaling inside the boiler 10.
[0028] like Figure 1 As shown, the separator 31 is provided to divert the superheated steam entering the separator 31. Part of the superheated steam is diverted by the separator 31 and discharged to the next process outside the steam boiler desalination and descaling system, and the remaining superheated steam is diverted by the separator 31 through the heat exchange return pipeline 32 to the desalination and descaling device 20 and heats the purified sewage inside the desalination and descaling device 20, thereby vaporizing the purified sewage inside the desalination and descaling device 20.
[0029] Optionally, the boosting device 70 is a steam pump that directly pressurizes the steam or a water pump that condenses the steam into water and then pressurizes the water, or other corresponding devices.
[0030] Specifically, the steam boiler desalination and descaling system further includes a discharge pipeline 40, which is connected to the lower part of the desalination and descaling device 20. Since the purified sewage will remain concentrated salt water in the desalination and descaling device 20 after desalination and descaling in the desalination and descaling device 20, which cannot enter the boiler 10, the discharge pipeline 40 is provided to be connected to the lower part of the desalination and descaling device 20 so that the concentrated salt water can be discharged to the spray drying plant for drying, thereby avoiding the concentrated salt water from being accumulated in the desalination and descaling device 20.
[0031] Specifically, the steam port of the desalter 20 is located at the upper part of the desalter 20. Since there are both gas and liquid inside the desalter 20, and only water vapor is required to enter the boiler 10 during the normal operation of the steam boiler desalter system, the steam port is arranged at the upper part of the desalter 20, which can facilitate the gas-liquid separation inside the desalter 20.
[0032] Optionally, the steam boiler desalination and descaling system further includes a purified sewage inlet liquid pipeline 50, which is connected to the desalination and descaling device 20 and has a first connection point, and the heat exchange return pipeline 32 has a second connection point with the desalination and descaling device 20, and the first connection point is higher than the second connection point. Of course, the specific positional relationship between the first connection point and the second connection point can also be reasonably adjusted according to the overall operation of the system.
[0033] Optionally, the steam boiler desalination and scale reduction system further includes an air injection pipeline 60, which is connected to the top of the separator 31. When the superheated steam is separated and discharged to the outside of the steam boiler desalination and scale reduction system through the separator 31, the air injection pipeline 60 is provided, and the air injection pipeline 60 can be used as a gas pipeline for the superheated steam.
[0034] Optionally, the steam boiler desalination and descaling system also includes a salt content detector for detecting the salt content of the liquid in the desalination and descaling device 20, and when the salt content detected by the salt content detector is greater than a preset value, the discharge pipeline 40 is enabled. Normally, since the boiler 10 needs to operate continuously, the desalination and descaling device 20 needs to work continuously to produce steam, so the discharge pipeline 40 at the bottom of the desalination and descaling device 20 cannot be opened frequently to keep the desalination and descaling device 20 able to operate normally to produce steam. This requires monitoring and detecting the salt content inside the desalination and descaling device 20, and when the detected salt content value is greater than the set value, the discharge pipeline 40 needs to be opened. Therefore, a salt content detector is provided to ensure the normal operation of the desalination and descaling device 20.
[0035] Optionally, the steam boiler desalination and descaling system also includes a prompting device, which is connected to the salt content detector. When the salt content detected by the salt content detector is greater than a preset value, the salt content detector sends a signal to the prompting device to cause the prompting device to alarm. The discharge pipeline 40 is provided with an electric switch valve or a manual switch valve. When the discharge pipeline 40 is provided with a manual switch valve, the staff opens the manual switch valve according to the alarm prompt of the prompting device. The prompting device is provided, and when the salt content inside the desalination and descaling device 20 reaches a set value, the staff can be notified through the prompting device. This can reduce the workload of the staff, so that the staff does not need to observe the detection of the salt content detector all the time, and only needs to work according to the prompt of the prompting device, saving manpower.
[0036] Optionally, the steam boiler desalination and descaling system further includes a plurality of desalination and descaling devices 20 and a plurality of valves, and the plurality of desalination and descaling devices 20 are arranged in parallel or in series to respectively inject steam into the boiler 10; the plurality of valves are arranged in one-to-one correspondence with the plurality of desalination and descaling devices 20 to control the connection state between the corresponding desalination and descaling devices 20 and the boiler 10. In this way, when a large amount of scaling occurs in a single desalination and descaling device 20, the desalination and descaling device 20 can be switched through the valve, thereby preventing the working efficiency of the boiler 10 from being affected by a large number of structures in the desalination and descaling device 20, thereby ensuring the normal and efficient operation of the entire system.
[0037] The operation method of the steam boiler desalination and scale reduction system in the present application adopts the above-mentioned steam boiler desalination and scale reduction system for production, and the operation method includes: an initial operation stage, in which purified sewage is injected into the desalination and scale reduction device 20 of the steam boiler desalination and scale reduction system, and part of the purified sewage enters the boiler 10 of the steam boiler desalination and scale reduction system through the desalination and scale reduction device 20 for heating, and the steam generated after heating enters the separator 31 of the steam boiler desalination and scale reduction system, and flows back to the desalination and scale reduction device 20 through the heat exchange return pipeline 32 of the steam boiler desalination and scale reduction system to heat the purified sewage in the desalination and scale reduction device 20; when the liquid level of the purified sewage in the desalination and scale reduction device 20 is lower than the connection point between the heat exchange return pipeline 32 and the desalination and scale reduction device 20, the steam boiler desalination and scale reduction system enters the normal steam production stage.
[0038] In the initial stage of operation of the steam boiler desalination and scale reduction system, superheated steam has not been generated inside the boiler 10, so it is impossible to divert the superheated steam to the desalination and scale reduction device 20 through the separator 31 to heat the purified sewage inside the desalination and scale reduction device 20. Therefore, it is necessary to add purified sewage or clean water into the boiler 10 through the desalination and scale reduction device 20 in the initial stage to generate superheated steam and adjust the flow of the purified sewage to the liquid pipeline 50 to enable the entire system to enter normal steam production.
[0039] Optionally, the operation method further includes: when the salt content detector in the desalter 20 detects that the salt content of the liquid in the desalter 20 is greater than a preset value, the discharge pipeline 40 of the steam boiler desalter system is enabled. By detecting the salt content of the liquid in the desalter 20, it is ensured that the desalter 20 can generate sufficient steam per unit time to ensure the normal production of the entire system.
[0040] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:
[0041] 1. Solved the problem of scaling, salt precipitation and pipeline blockage in the boiler system and its downstream pipelines during the steam production process of the existing boiler system;
[0042] 2. It greatly reduces the potential safety hazard of boiler tube bursting. It is no longer necessary to frequently flush the pipeline with hot water. The boiler production efficiency is increased and the pipeline pressure loss is reduced.
[0043] 3. The pump inspection cycle is extended and the leakage of the pumping unit stuffing box is reduced;
[0044] 4. The superheat of steam injection is increased and the steam injection effect is improved.
[0045] Obviously, the embodiments described above are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.
[0046] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.
[0047] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.
[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A steam boiler desalination and descaling system, characterized in that: include: Boiler (10); A desalination and descaling device (20), the desalination and descaling device (20) being located upstream of the boiler (10), and the steam port of the desalination and descaling device (20) being in communication with the steam inlet of the boiler (10); a heating structure (30), the heating structure (30) comprising a separator (31) and a heat exchange return pipeline (32), wherein the inlet of the separator (31) is connected to the steam discharge port of the boiler (10), and the separator (31) is connected to the desalination and descaling device (20) through the heat exchange return pipeline (32) so as to introduce the high-pressure hot steam generated by the boiler (10) into the desalination and descaling device (20) and heat the purified sewage; a pressurizing device (70), the pressurizing device (70) pressurizing the steam entering the boiler (10); The steam boiler desalination and descaling system further comprises a discharge pipeline (40), wherein the discharge pipeline (40) is connected to the lower part of the desalination and descaling device (20); The steam boiler desalination and descaling system further comprises a salt content detector for detecting the salt content of the liquid in the desalination and descaling device (20), and when the salt content detected by the salt content detector is greater than a preset value, the discharge pipeline (40) is activated; The steam outlet of the desalination and descaling device (20) is located at the upper part of the desalination and descaling device (20); The steam boiler desalination and descaling system further comprises a purified sewage inlet pipeline (50), the purified sewage inlet pipeline (50) being connected to the desalination and descaling device (20) and having a first connection point, and the heat exchange return pipeline (32) having a second connection point with the desalination and descaling device (20).
2. The steam boiler desalination and descaling system according to claim 1, characterized in that: The steam boiler desalination and scale reduction system further comprises an air injection pipeline (60), wherein the air injection pipeline (60) is in communication with the separator (31).
3. The steam boiler desalination and descaling system according to claim 1, characterized in that: The steam boiler desalination and descaling system further comprises a prompting device, which is connected to the salt content detector. When the salt content detected by the salt content detector is greater than a preset value, the salt content detector sends a signal to the prompting device so that the prompting device gives an alarm prompt. The discharge pipeline (40) is provided with an electric switch valve or a manual switch valve. When the discharge pipeline (40) is provided with the manual switch valve, a staff member opens the manual switch valve according to the alarm prompt of the prompting device.
4. The steam boiler desalination and descaling system according to claim 1, characterized in that: The steam boiler desalination and scaling reduction system further comprises: A plurality of the desalination and descaling devices (20), wherein the plurality of the desalination and descaling devices (20) are arranged in parallel or in series to respectively inject steam into the boiler (10); A plurality of valves are provided in a one-to-one correspondence with the plurality of desalination and descaling devices (20) to control the connection state between the corresponding desalination and descaling devices (20) and the boiler (10).
5. An operating method for a steam boiler desalination and descaling system, characterized in that: The steam boiler desalination and descaling system according to any one of claims 1 to 4 is used for production, and the operation method comprises: In an initial operation stage, purified sewage is injected into the desalination and descaling device (20) of the steam boiler desalination and descaling system, and part of the purified sewage passes through the desalination and descaling device (20) into the boiler (10) of the steam boiler desalination and descaling system for heating. Steam generated after heating enters the separator (31) of the steam boiler desalination and descaling system, and flows back to the desalination and descaling device (20) through the heat exchange return pipeline (32) of the steam boiler desalination and descaling system, so as to heat the purified sewage in the desalination and descaling device (20); When the liquid level of the purified sewage in the desalination and descaling device (20) is lower than the connection point between the heat exchange return pipeline (32) and the desalination and descaling device (20), the steam boiler desalination and descaling system enters the normal steam production stage.
6. The operating method according to claim 5, characterized in that: The operation method further includes: When the salt content detector in the desalination and descaling device (20) detects that the salt content of the liquid in the desalination and descaling device (20) is greater than a preset value, the discharge pipeline (40) of the steam boiler desalination and descaling system is activated.