Boiler soot blowing drain water recovery system
By introducing a drain reheater into the boiler sootblowing system to collect and heat drain, the problem of difficult recovery of boiler sootblowing drain is solved, efficient recovery and reuse of drain is achieved, and the energy utilization efficiency of the system is improved.
Patent Information
- Application Number
- CN202422646294.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-09-23
- Estimated Expiration
- 2034-10-31
AI Technical Summary
The existing boiler sootblowing and draining system has problems such as large working fluid and heat loss, unstable working fluid control, and drastic energy changes, which make it difficult to achieve full recovery.
A boiler sootblowing drain recovery system including a drain reheater is designed. The condensed drain is collected when the boiler sootblowing pipe is preheated with steam, and the drain is heated by the drain reheater to finally be recovered and reused in the form of hot water or steam.
It achieves efficient recovery and reuse of hydrophobicity, reduces the loss of working fluid and heat, and improves the energy utilization efficiency of the system.
Smart Images
Figure CN223375768U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of boilers, in particular to a boiler sootblowing drainage recovery system. Background Art
[0002] Boiler sootblowers are essential equipment for ensuring the cleanliness of boiler heating surfaces, preventing sooting and slagging, and improving boiler efficiency and safety. Steam sootblowers are the most widely used. To prevent water in the sootblowing steam from eroding the boiler tube walls, the sootblowing steam pipe must be drained before each sootblowing operation. The drain is then discharged to the boiler expansion system. Once the steam temperature reaches the required level, the drain is closed and sootblowing can resume. Depending on unit operating conditions, sootblowing may be performed multiple times daily. However, due to the lengthy draining time of the sootblowing pipe, the drain is often discharged directly into the ditch, resulting in significant loss of working fluid and heat. In addition, since boiler sootblowing is carried out intermittently, its drainage is also intermittent. There are three characteristics of intermittent drainage. First, there is alternating impact of air, water and water vapor in the drainage pipe, and the oxide scale generation and shedding on the inner wall of the pipe are relatively significant, and the water quality is poor; second, there is a large change in the physical state of the working fluid. From low-temperature water to steam-water mixture to steam, the specific volume of the working fluid differs by 180 times. Under the same mass flow rate, the flow rate also differs by 180 times, making it almost impossible to achieve stable control and recovery of all working fluids; third, the energy carried by the drainage varies greatly. From the early low-temperature water to the final superheated steam, the drainage value increases from the initial 80kJ / kg to about 2800kJ / kg, and the energy contained increases by more than 30 times, which has a greater impact on the recovery system. These three reasons make it difficult to fully recover the working fluid and energy of boiler sootblowing drainage. Utility Model Content
[0003] In order to solve the above technical problems, the purpose of the present invention is to provide a boiler sootblowing drain recovery system which has a simple structure and can fully recover the drain and the heat it carries.
[0004] In order to achieve the above-mentioned purpose, the technical solution of the present invention is as follows: A boiler sootblowing drain recovery system includes a steam supply source, a boiler sootblowing fixed row and a boiler sootblowing pipe, the steam supply source and the boiler sootblowing fixed row are both connected to the steam inlet end of the boiler sootblowing pipe, a first valve component is provided at the connection between the steam supply source and the boiler sootblowing pipe, a second valve component is provided at the connection between the boiler sootblowing fixed row and the boiler sootblowing pipe, and also includes a drain reheater, and the water inlet of the drain reheater is connected to the steam inlet end of the boiler sootblowing pipe, and a third valve component is provided at the connection between the two.
[0005] The beneficial effect of the above technical solution is that when steam is used to preheat the boiler sootblower, the drain generated by steam condensation is collected by the drain reheater. Since the temperature of the boiler sootblower gradually rises during the preheating process, the amount of steam condensed into drain will gradually decrease, which will cause the temperature of the drain collected in the drain reheater to gradually increase. For the drain reheater, although the temperature of the drain collected in the early stage is relatively low, the temperature of the drain collected in the later stage is relatively high. However, the overall temperature of the drain collected in the end is high. At this time, the drain collected by the drain reheater can be recycled in the form of hot water, or it can be reheated to steam and reused.
[0006] In the above technical solution, a flow regulating valve is further provided at the connection point between the steam supply source and the boiler sootblowing pipe.
[0007] The beneficial effect of the above technical solution is that the steam flow rate of the boiler sootblower during preheating can be adjusted by the flow control valve.
[0008] The hydrophobic reheater in the above technical solution includes a kettle body having a water inlet and a water outlet. The water inlet of the kettle body constitutes the water inlet of the hydrophobic reheater, and a fourth valve member is provided at the water outlet of the kettle body.
[0009] The beneficial effect of the above technical solution is that it has a simple structure.
[0010] In the above technical solution, a heater is provided on the kettle body.
[0011] The beneficial effect of the above technical solution is that after the drain is collected in the drain reheater, the drain therein can be heated by the heater.
[0012] In the above technical solution, a pressure relief valve is provided at the upper end of the kettle body.
[0013] The beneficial effect of the above technical solution is that it can avoid excessive pressure in the kettle body and ensure that the hydrophobic reheater can maintain safe operation.
[0014] In the above technical solution, the water outlet of the kettle body is connected to the steam heating main pipe, and the fourth valve component is provided at the connection point between the two.
[0015] The beneficial effect of the above technical solution is that the drain collected by the drain reheater can be steamed and then supplied to the steam heating main pipe, thereby realizing the recovery and reuse of the drain.
[0016] In the above technical solution, a nozzle is provided at the inner bottom of the kettle body, and the water inlet of the kettle body is extended inwardly to communicate with the nozzle.
[0017] The beneficial effect of the above technical solution is that the hydrophobicity can be sprayed out through the nozzle at the bottom of the kettle body, so that the steam content in the later stage of hydrophobic collection is relatively high, and steam can be sprayed through the nozzle to heat the hydrophobicity more fully.
[0018] In the above technical solution, a sewage outlet is provided at the bottom of the kettle body, and a sewage valve is provided at the sewage outlet.
[0019] The beneficial effect of the above technical solution is that it allows the kettle to be regularly deslagging to avoid residue deposition in the kettle.
[0020] In the above technical solution, a buffer tube is provided at the sewage outlet, one end of the buffer tube is connected to the sewage outlet, the other end of the buffer tube is blocked, and a sewage valve with one end connected to the outside is provided in the middle of the buffer tube.
[0021] The beneficial effect of the above technical solution is that when the drain valve is opened, if the pressure in the kettle is relatively high, the buffer pipe can be used for pressure buffering to avoid spraying at the drain valve.
[0022] In the above technical solution, the kettle body is provided with a pressure monitoring element, a temperature monitoring element and a liquid level monitoring element.
[0023] The beneficial effect of the above technical solution is that the temperature, pressure and liquid level in the kettle can be monitored in a timely manner. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 It is a structural diagram of a boiler soot blowing system in the prior art;
[0025] Figure 2 This is a structural diagram of a boiler sootblowing drain recovery system according to an embodiment of the present utility model;
[0026] Figure 3 This is a schematic structural diagram of the hydrophobic reheater described in an embodiment of the present utility model.
[0027] In the figure: 1. Steam supply source; 2. Boiler sootblowing fixed discharge; 3. Boiler sootblowing pipe; 4. Steam trap reheater; 41. Kettle body; 411. Drain port; 412. Pressure monitoring element; 413. Temperature monitoring element; 414. Liquid level monitoring element; 415. Pressure relief valve; 416. Nozzle; 417. Drain valve; 418. Buffer pipe; 42. Heater; 5. Steam heating main pipe; 61. First valve component; 62. Flow control valve; 63. Second valve component; 64. Third valve component; 65. Fourth valve component; 66. Check valve. DETAILED DESCRIPTION
[0028] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples provided are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. The following paragraphs describe the present invention in more detail by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become more apparent from the following description and claims. It should be noted that the drawings are in a very simplified form and are not in exact proportions, and are only used to facilitate and clearly illustrate the embodiments of the present invention.
[0029] like Figure 1 As shown, the existing boiler sootblowing system includes a steam supply source 1, a boiler sootblowing fixed row 2 and a boiler sootblowing pipe 3. The steam supply source 1 and the boiler sootblowing fixed row 2 are both connected to the steam inlet end of the boiler sootblowing pipe 3. A first valve component 61 is provided at the connection between the steam supply source 1 and the boiler sootblowing pipe 3, and a second valve component 63 is provided at the connection between the boiler sootblowing fixed row 2 and the boiler sootblowing pipe 3. At this time, the drain generated when the boiler sootblowing pipe is preheated and the steam involved are discharged into the boiler sootblowing fixed row 2 and will eventually be discarded. The boiler sootblowing drain recovery system provided in this embodiment is improved on the basis of the above-mentioned existing technology (boiler sootblowing system), such as Figure 2 As shown, a drain reheater 4 is added, and the water inlet of the drain reheater 4 is connected to the steam inlet end of the boiler sootblower 3, and a third valve member 64 is provided at the connection between the two. In this way, when the boiler sootblower is preheated by steam, the drain generated by steam condensation is collected by the drain reheater. Since the temperature of the boiler sootblower will gradually rise during the preheating process, the amount of steam condensed into drain will gradually decrease, so that the temperature of the drain collected in the drain reheater will gradually increase. For the drain reheater, although the temperature of the drain collected in the early stage is relatively low, the temperature of the drain collected in the later stage is higher. The temperature of the drain is relatively high, but the overall temperature of the drain collected in the end is relatively high. At this time, the drain collected by the drain reheater can be recycled in the form of hot water, or it can be reheated to steam and reused (when the boiler sootblower is preheated by steam, the temperature of the boiler sootblower gradually rises. At this time, the drain discharged into the drain reheater gradually decreases while the steam content gradually increases. Therefore, for the drain reheater, the low-temperature drain collected in the early stage can be reheated by the steam sent in later. At this time, the drain temperature can be raised without external heating. After the drain temperature is raised, it can be discharged in the form of hot water, or it can continue to be heated and discharged in the form of steam). The boiler sootblower fixed drain 2 of the boiler sootblower drain recovery system provided in this embodiment no longer collects the drain and residual steam generated during the preheating of the boiler sootblower 3. At this time, the boiler sootblower fixed drain 2 can be used to collect other process water of the boiler.
[0030] In the above technical solution, a flow regulating valve 62 is further provided at the connection point between the steam supply source 1 and the boiler sootblowing pipe 3, so that the steam flow rate of the boiler sootblowing pipe during preheating can be adjusted by the flow regulating valve.
[0031] like Figure 3 As shown, the hydrophobic reheater 4 in the above technical solution includes a kettle body 41, and the kettle body 41 has a water inlet and a water outlet. The water inlet of the kettle body 41 constitutes the water inlet of the hydrophobic reheater 4, and a fourth valve component 65 is provided at the water outlet of the kettle body 41, which has a simple structure.
[0032] In the above technical solution, a heater 42 is provided on the kettle body 41, so that after the drain is collected in the drain reheater, the drain inside can be heated by the heater. In this embodiment, the heater can be an electric heating tube embedded in the bottom of the kettle body (the setting method of the heater on the kettle body belongs to the existing technology and will not be repeated here).
[0033] In the above technical solution, a pressure relief valve 415 is provided at the upper end of the kettle body 41, which can avoid excessive pressure in the kettle body and ensure that the hydrophobic reheater can maintain safe operation.
[0034] In the above technical solution, the water outlet of the kettle body 41 is connected to the steam heating main pipe 5, and the fourth valve component 65 is provided at the connection point between the two (preferably, a check valve 66 is also provided at the connection point between the water outlet of the kettle body 41 and the steam heating main pipe 5, and the check valve is used to prevent the steam in the steam heating main pipe from flowing back into the kettle body). The steam heating main pipe transports saturated steam, so that the drain collected by the drain reheater can be vaporized and then supplied to the steam heating main pipe, thereby realizing the recovery and reuse of the drain. At this time, the steam of the steam supply source can be drawn from the steam heating main pipe.
[0035] In the above technical solution, a nozzle 416 is provided at the inner bottom of the kettle body 41, and the water inlet of the kettle body 41 (located at one end inside the kettle body) is extended inward to be connected with the nozzle 416, so that the hydrophobicity can be sprayed out through the nozzle at the bottom of the kettle body. In this way, the steam content in the later stage of hydrophobicity collection is relatively high, and at this time, steam can be sprayed through the nozzle to heat the hydrophobicity more fully.
[0036] In the above technical solution, a drain port 411 is provided at the bottom of the kettle body 41, and a drain valve 417 is provided at the drain port 411, so that slag can be discharged regularly in the kettle body to avoid residue deposition in the kettle body. A buffer pipe 418 is provided at the drain port 411, one end of the buffer pipe 418 is connected to the drain port 411, and the other end of the buffer pipe 418 is blocked. A drain valve 417 with one end connected to the outside world is provided in the middle of the buffer pipe 418, so that when the drain valve is opened, if the pressure in the kettle body is relatively high, the buffer pipe can be used for pressure buffering to avoid spraying at the drain valve.
[0037] In the above technical solution, the kettle body 41 is provided with a pressure monitoring element 412 (which can be a digital pressure gauge or pressure sensor), a temperature monitoring element 413 (which can be a digital thermometer or temperature sensor) and a liquid level monitoring element 414 (which can be a digital liquid level gauge or liquid level sensor), so that the temperature, pressure and liquid level in the kettle body can be monitored in time.
[0038] In this embodiment, steam is supplied to the steam heating main pipe, and the drain in the drain reheater in this embodiment can be eventually heated into steam and then discharged into the steam heating main pipe. Preferably, the drain in the drain reheater is heated by steam, that is, after the preheating of the boiler sootblower 3 is completed, saturated steam can still be introduced into the drain reheater to heat the drain until it is completely vaporized and finally discharged into the steam heating main pipe (since the cost of using steam to heat the drain is lower, the heater in this embodiment is only used as a backup heating component of the kettle body).
[0039] When the drain in the drain reheater is recycled in the form of hot water (for example, the hot water sent out by the drain reheater can be used as domestic hot water in the factory), the water outlet of the kettle body can be set at its lower end and does not need to be connected to the steam heating main pipe; when the drain in the drain reheater is recycled in the form of steam, the water outlet of the kettle body can be set at its upper end.
[0040] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Any ordinary technician in this industry can smoothly implement the present invention as shown in the drawings and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with this profession without departing from the scope of the technical solution of the present invention using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the scope of protection of the technical solution of the present invention.
Claims
1. A boiler sootblowing drainage recovery system, comprising a steam supply source (1), a boiler sootblowing fixed row (2) and a boiler sootblowing pipe (3), wherein the steam supply source (1) and the boiler sootblowing fixed row (2) are both connected to the steam inlet end of the boiler sootblowing pipe (3), a first valve member (61) is provided at the connection point between the steam supply source (1) and the boiler sootblowing pipe (3), and a second valve member (63) is provided at the connection point between the boiler sootblowing fixed row (2) and the boiler sootblowing pipe (3), characterized in that: It also includes a drain reheater (4), and the water inlet of the drain reheater (4) is connected to the steam inlet end of the boiler sootblower (3), and a third valve component (64) is provided at the connection point between the two.
2. The boiler sootblowing drain recovery system according to claim 1, characterized in that: A flow regulating valve (62) is also provided at the connection point between the steam supply source (1) and the boiler sootblowing pipe (3).
3. The boiler sootblowing drain recovery system according to claim 1, characterized in that: The hydrophobic reheater (4) comprises a kettle body (41), the kettle body (41) having a water inlet and a water outlet, the water inlet of the kettle body (41) constituting the water inlet of the hydrophobic reheater (4), and a fourth valve member (65) being provided at the water outlet of the kettle body (41).
4. The boiler sootblowing drain recovery system according to claim 3, characterized in that: The kettle body (41) is provided with a heater (42).
5. The boiler sootblowing drain recovery system according to claim 3, characterized in that: A pressure relief valve (415) is provided at the upper end of the kettle body (41).
6. The boiler sootblowing drain recovery system according to claim 3, characterized in that: The water outlet of the kettle body (41) is connected to the steam heating main pipe (5), and the fourth valve member (65) is provided at the connection point between the two.
7. The boiler sootblowing drain recovery system according to claim 3, characterized in that: A nozzle (416) is provided at the inner bottom of the kettle body (41), and the water inlet of the kettle body (41) is extended inwardly to communicate with the nozzle (416).
8. The boiler sootblowing drain recovery system according to claim 3, characterized in that: A sewage outlet (411) is provided at the bottom of the kettle body (41), and a sewage valve (417) is provided at the sewage outlet (411).
9. The boiler sootblowing drain recovery system according to claim 8, characterized in that: A buffer pipe (418) is provided at the sewage outlet (411), one end of the buffer pipe (418) is communicated with the sewage outlet (411), the other end of the buffer pipe (418) is blocked, and a sewage valve (417) with one end communicating with the outside is provided in the middle of the buffer pipe (418).
10. The boiler sootblowing drain recovery system according to claim 3, characterized in that: The kettle body (41) is provided with a pressure monitoring element (412), a temperature monitoring element (413) and a liquid level monitoring element (414).