Waste heat boiler blow-off energy recovery device

Abstract

The utility model relates to the technical field of high-energy boiler water recycling, in particular to a waste heat boiler blow-off energy recovery device which comprises a waste heat boiler, a steam flash tank and a controller, the bottom of the waste heat boiler is communicated with a first blow-off pipeline, and a second blow-off pipeline is communicated between the first blow-off pipeline and the lower portion of the steam flash tank. The top of the steam flash tank is communicated with a steam conveying pipeline, the bottom of the steam flash tank is communicated with a condensate conveying pipeline, an online analysis detector is installed on the condensate conveying pipeline, a pressure monitor and a liquid level meter are arranged on the steam flash tank, and the online analysis detector, the pressure monitor and the liquid level meter are all electrically connected with the controller. The waste heat boiler blow-down water energy recycling device effectively utilizes the energy of waste heat boiler blow-down water, greatly stabilizes the operation of a steam pipe network in winter, realizes the effective recycling of the energy, reduces the treatment cost of the waste heat boiler blow-down water, and has the characteristics of safety, labor saving, simplicity, convenience and high efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of high-energy boiler water recovery and reuse, and is a waste heat boiler sewage energy recovery device. Background Art

[0002] In recent years, under the new situation of national energy conservation and emission reduction, in order to implement the national strategic goal of "carbon peak and carbon neutrality", chemical companies, as large energy consumers, have assumed an important role. In the process production process, waste boiler-blowdown-steam is an important link. When the boiler is operating normally, some impurities will be brought into the boiler by water. Except for a very small number of impurities that can be taken away by steam, most impurities remain in the boiler water under high temperature and high pressure working environment. And because the ability of steam to dissolve salt is much lower than that of boiler water, when the steam leaves the boiler, the salt will be concentrated and remain in the boiler water. If this accumulation continues and no measures are taken to discharge these impurities and high-salt water out of the boiler, the quality of steam produced by the boiler will eventually deteriorate. In particular, when there are too many impurities, the circulation resistance of the water-cooled wall may increase or even block it, which will endanger the safe operation of the boiler. Therefore, the boiler must be blown down regularly.

[0003] At present, there are two ways to discharge boiler blowdown: one is regular discharge and the other is continuous discharge. The main purpose of regular discharge is to remove water slag and dirt in boiler water, which is generally led out of the discharge port from the lowest point of the water circulation system. The main purpose of continuous discharge is to discharge boiler water with high salt concentration in the drum to prevent excessive salt content from causing steam and water to boil together, affecting steam quality, and also to remove some fine water slag in the boiler water.

[0004] In order to facilitate production and operation, most enterprises generally use continuous sewage discharge for boilers or waste heat boilers, and discharge sewage directly into the ditch. This not only wastes energy, but also increases the cost of sewage treatment. At the same time, in cold regions such as Northwest or Northeast my country, when discharging sewage, due to the certain heat of the sewage discharged by the boiler or waste heat boiler, it is easy to form rime and ice accumulation, which increases the safety risk of production equipment and on-site workers.

[0005] Therefore, the above problems can only be solved by effectively recycling the wastewater from boilers or waste heat boilers. However, the effective utilization of waste heat boiler wastewater by continuous sewage discharge has become a technical problem that is difficult for enterprises to overcome. Summary of the invention

[0006] The utility model provides a waste heat boiler sewage energy recovery device, which overcomes the shortcomings of the above-mentioned prior art and can effectively solve the problem of energy saving and emission reduction not meeting the standards in safe production of waste heat boilers of existing enterprises.

[0007] The technical solution of the utility model is achieved through the following measures: a waste heat boiler sewage energy recovery device, including a waste heat boiler, a steam expansion tank, and a controller, the bottom outlet of the waste heat boiler is fixedly connected with a first sewage pipeline, the first sewage pipeline and the lower inlet of the steam expansion tank are fixedly connected with a second sewage pipeline, the first outlet at the top of the steam expansion tank is fixedly connected with a steam delivery pipeline, the bottom liquid outlet of the steam expansion tank is fixedly connected with a condensate delivery pipeline, an online analysis detector is fixedly installed on the condensate delivery pipeline, a pressure monitor and a liquid level gauge are arranged on the steam expansion tank, and the online analysis detector, the pressure monitor, and the liquid level gauge are all electrically connected to the controller.

[0008] The following are further optimizations and / or improvements to the above utility model technical solution:

[0009] The second outlet at the top of the steam expansion tank is fixedly connected with a gas phase venting pipeline.

[0010] A safety valve is fixedly installed on the above-mentioned gas phase venting pipeline.

[0011] The steam delivery pipeline is fixedly installed with a steam check valve and a gas stop valve in sequence according to the flow direction of the medium.

[0012] The first sewage discharge pipeline between the waste heat boiler and the second sewage discharge pipeline is fixedly installed with a first sewage discharge stop valve and a second sewage discharge stop valve in sequence according to the flow direction of the medium.

[0013] A drain valve is fixedly installed on the first sewage pipeline between the second sewage pipeline and the outlet of the first sewage pipeline.

[0014] A first sewage discharge control valve is fixedly installed on the second sewage discharge pipeline, and a third sewage discharge bypass pipeline is fixedly connected to the second sewage discharge pipeline between the inlet and the outlet of the first sewage discharge control valve.

[0015] A sewage bypass stop valve is fixedly installed on the third sewage bypass pipeline, and a sewage third stop valve is fixedly installed on the second sewage pipeline between the first sewage bypass pipeline and the second sewage bypass pipeline.

[0016] The condensate delivery pipeline between the above-mentioned online analysis detector and the condensate delivery pipeline outlet is fixedly installed with a liquid level control valve and a condensate three-way valve in sequence according to the medium flow direction, and the lower outlet of the condensate three-way valve is fixedly connected to the condensate drain pipeline.

[0017] The liquid level control valve, condensate three-way valve, first sewage control valve and safety valve are all electrically connected to the controller.

[0018] The utility model has a reasonable and compact structure and is easy to use. It effectively utilizes the energy of waste heat boiler sewage to recover low-quality steam and condensate in this part of energy, greatly stabilizes the operation of the steam pipeline network in winter, realizes the effective reuse of energy, and reduces the treatment cost of waste heat boiler sewage. It is safe, labor-saving, simple and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Attached Figure 1 This is a schematic diagram of the process flow of the utility model.

[0020] Attached Figure 1 The codes are as follows: 1 is the waste heat boiler, 2 is the steam expansion tank, 3 is the first sewage pipeline, 4 is the second sewage pipeline, 5 is the steam delivery pipeline, 6 is the condensate delivery pipeline, 7 is the pressure monitor, 8 is the liquid level gauge, 9 is the first sewage stop valve, 10 is the second sewage stop valve, 11 is the drain valve, 12 is the first sewage control valve, 13 is the third sewage bypass pipeline, 14 is the sewage bypass stop valve, 15 is the third sewage stop valve, 16 is the gas phase venting pipeline, 17 is the safety valve, 18 is the steam one-way valve, 19 is the gas stop valve, 20 is the online analysis detector, 21 is the liquid level control valve, 22 is the condensate three-way valve, 23 is the condensate sewage pipeline, and 24 is the controller. DETAILED DESCRIPTION

[0021] The present invention is not limited by the following embodiments, and specific implementation methods can be determined according to the technical solution of the present invention and actual conditions.

[0022] In the present invention, unless otherwise specified, the equipment and devices used are all the equipment and devices known and used in the art.

[0023] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached manual. Figure 1 The layout is described in detail, such as the positional relationship of front, back, top, bottom, left, right, etc., which is based on the attached manual. Figure 1 It is determined by the layout direction.

[0024] The present invention is further described below in conjunction with the embodiments and drawings:

[0025] Embodiment 1: As attached Figure 1As shown, the waste heat boiler sewage energy recovery device includes a waste heat boiler 1, a steam expansion tank 2, and a controller 24. The bottom outlet of the waste heat boiler 1 is fixedly connected with a first sewage pipeline 3, and the first sewage pipeline 3 and the lower inlet of the steam expansion tank 2 are fixedly connected with a second sewage pipeline 4. The first outlet at the top of the steam expansion tank 2 is fixedly connected with a steam delivery pipeline 5, and the bottom liquid outlet of the steam expansion tank 2 is fixedly connected with a condensate delivery pipeline 6. An online analysis detector 20 is fixedly installed on the condensate delivery pipeline 6. A pressure monitor 7 and a liquid level gauge 8 are provided on the steam expansion tank 2. The online analysis detector 20, the pressure monitor 7, and the liquid level gauge 8 are all electrically connected to the controller 24.

[0026] The above waste heat boiler blowdown energy recovery device can be further optimized and / or improved according to actual needs:

[0027] As attached Figure 1 As shown, a gas phase venting pipeline 16 is fixedly connected to the second outlet at the top of the steam expansion tank 2 .

[0028] As attached Figure 1 As shown, a safety valve 17 is fixedly installed on the gas phase venting pipeline 16.

[0029] As attached Figure 1 As shown, the steam delivery pipeline 5 is fixedly installed with a steam check valve 18 and a gas shut-off valve 19 in sequence according to the flow direction of the medium.

[0030] As required, the safety valve 17 is used to enhance the safety performance of the steam expander 2. When the operating pressure of the steam expander 2 exceeds the maximum allowable working pressure of 0.4 MPa of the steam expander 2, the safety valve 17 will automatically trip to release the pressure. The steam check valve 18 can prevent the medium in the steam delivery pipeline 5 from flowing back.

[0031] As attached Figure 1 As shown, the first sewage discharge pipeline 3 between the waste heat boiler 1 and the second sewage discharge pipeline 4 is fixedly connected with a first sewage discharge stop valve 9 and a second sewage discharge stop valve 10 in sequence according to the flow direction of the medium.

[0032] As required, the first stop valve 9 and the second sewage stop valve 10 can form a double valve to control the sewage flow of the waste heat boiler 1, thereby improving the sewage safety performance of the waste heat boiler 1.

[0033] As attached Figure 1 As shown, a drain valve 11 is fixedly installed on the first sewage pipeline 3 between the second sewage pipeline 4 and the outlet of the first sewage pipeline 3 .

[0034] As attached Figure 1 As shown, a first sewage discharge control valve 12 is fixedly installed on the second sewage discharge pipeline 4 , and a third sewage discharge bypass pipeline 13 is fixedly connected to the second sewage discharge pipeline 4 between the inlet and the outlet of the first sewage discharge control valve 12 .

[0035] As attached Figure 1 As shown, a sewage bypass stop valve 14 is fixedly installed on the third sewage bypass pipeline 13 , and a sewage third stop valve 15 is fixedly installed on the second sewage pipeline 4 between the first sewage pipeline 3 and the second sewage bypass pipeline 13 .

[0036] As required, the bypass stop valve 14 and the third stop valve 15 can promptly handle sudden dangerous situations during the waste heat boiler 1 sewage discharge process.

[0037] As attached Figure 1 As shown, the condensate delivery pipeline 6 between the online analysis detector 20 and the outlet of the condensate delivery pipeline 6 is fixedly installed with a liquid level control valve 21 and a condensate three-way valve 22 in sequence according to the flow direction of the medium, and the lower outlet of the condensate three-way valve 22 is fixedly connected to a condensate drain pipeline 23.

[0038] As attached Figure 1 As shown, the liquid level control valve 21 , the condensate three-way valve 22 , the first sewage control valve 12 , and the safety valve 17 are all electrically connected to the controller 24 .

[0039] As required, the pressure monitor 7 is used to monitor the working pressure of the steam expander 2. When the working pressure of the steam expander 2 is lower than 0.4 MPa, the opening of the first sewage control valve 12 and the sewage bypass stop valve 14 is increased. When the working pressure of the steam expander 2 is higher than 0.4 MPa, the opening of the first control valve 12 and the sewage bypass stop valve 14 is reduced, or only one of the valves is opened.

[0040] As required, the online analysis detector 20 can analyze the impurity content of the condensate at the inlet of the condensate delivery pipeline 6. The standard values ​​of the impurity content of the condensate are: conductivity ≤ 150 μs / cm, hardness ≤ 0.2 mg / L, silicon dioxide ≤ 20 μg / kg, chloride ion ≤ 4 mg / L. When the impurity content of the condensate exceeds the standard value, the condensate is discharged into the condensate drainage pipeline 23 through the condensate three-way valve 22 and sent to the ditch. When the impurity content of the condensate is within the standard value range, the condensate enters the condensate delivery pipeline 6 through the condensate three-way valve 22 and is sent to the condensate recovery pipeline network for use in downstream production processes.

[0041] As required, the pipelines and equipment of the waste heat boiler sewage energy recovery device may be provided with conventional valves, thermometers, pressure gauges, etc. known and used in the art according to production needs.

[0042] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect, and can add or reduce unnecessary technical features according to actual needs to meet the needs of different situations. The controller 24 is a DCS controller, and the model of the DCS controller can be a CS3000 controller produced by Yokogawa Corporation of Japan.

[0043] The use process of the embodiment of the utility model is as follows: first, the sewage in the waste heat boiler 1 can be directly discharged into the ditch through the first sewage pipeline 3, or can enter the steam expansion tank 2 through the first sewage pipeline 3, the second sewage pipeline 4, and the third sewage bypass pipeline 14 for expansion and pressurization storage, so as to achieve the purpose of energy saving, emission reduction and safe production; then, when the sewage with a certain amount of heat in the steam expansion tank 2 is expanded and pressurized to the required pressure, low-calorie steam will gather in the upper part of the steam expansion tank 2, and the low-calorie steam will enter the low-quality steam network through the steam delivery pipeline 5 for use in the downstream production process; finally, sewage containing impurities will gather in the lower part of the steam expansion tank 2. If there are more impurities in the sewage, the sewage will be discharged into the ditch through the condensate delivery pipeline 6 and the condensate sewage pipeline 23. If there are fewer impurities in the sewage, the sewage will enter the condensate recovery network through the condensate delivery pipeline 6.

Claims

1. A waste heat boiler blowdown energy recovery device, characterized in that It includes a waste heat boiler, a steam expansion tank, and a controller. The bottom outlet of the waste heat boiler is fixedly connected with a first sewage pipeline, the first sewage pipeline and the lower inlet of the steam expansion tank are fixedly connected with a second sewage pipeline, the first outlet at the top of the steam expansion tank is fixedly connected with a steam delivery pipeline, the bottom liquid outlet of the steam expansion tank is fixedly connected with a condensate delivery pipeline, an online analysis detector is fixedly installed on the condensate delivery pipeline, a pressure monitor and a liquid level gauge are arranged on the steam expansion tank, and the online analysis detector, the pressure monitor and the liquid level gauge are all electrically connected to the controller.

2. The waste heat boiler blowdown energy recovery device according to claim 1 is characterized in that The second outlet at the top of the steam expansion tank is fixedly connected with a gas phase venting pipeline.

3. The waste heat boiler blowdown energy recovery device according to claim 2 is characterized in that A safety valve is fixedly installed on the gas phase vent pipeline.

4. The waste heat boiler blowdown energy recovery device according to claim 1, 2 or 3, characterized in that The steam transmission pipeline is fixedly installed with steam check valves and gas stop valves in sequence according to the flow direction of the medium.

5. The waste heat boiler blowdown energy recovery device according to claim 4 is characterized in that The first sewage discharge pipeline between the waste heat boiler and the second sewage discharge pipeline is fixedly installed with a first sewage discharge stop valve and a second sewage discharge stop valve in sequence according to the flow direction of the medium.

6. The waste heat boiler blowdown energy recovery device according to claim 5 is characterized in that A drain valve is fixedly installed on the first sewage pipeline between the second sewage pipeline and the outlet of the first sewage pipeline.

7. The waste heat boiler blowdown energy recovery device according to claim 6 is characterized in that A first sewage discharge control valve is fixedly installed on the second sewage discharge pipeline, and a third sewage discharge bypass pipeline is fixedly connected to the second sewage discharge pipeline between the inlet and the outlet of the first sewage discharge control valve.

8. The waste heat boiler blowdown energy recovery device according to claim 7 is characterized in that A sewage bypass stop valve is fixedly installed on the third sewage bypass pipeline, and a sewage third stop valve is fixedly installed on the second sewage pipeline between the first sewage pipeline and the second sewage bypass pipeline.

9. The waste heat boiler blowdown energy recovery device according to claim 5, 6, 7 or 8, characterized in that The condensate delivery pipeline between the online analysis detector and the condensate delivery pipeline outlet is fixedly installed with a liquid level control valve and a condensate three-way valve in sequence according to the medium flow direction, and the lower outlet of the condensate three-way valve is fixedly connected to the condensate drain pipeline.

10. The waste heat boiler blowdown energy recovery device according to claim 9, characterized in that The liquid level control valve, the condensate three-way valve, the first sewage control valve and the safety valve are all electrically connected to the controller.

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