Wastewater recovery system for steam seal cooler of back pressure steam turbine

Abstract

The utility model relates to the technical field of chemical engineering, in particular to a waste water recovery system for a steam seal cooler of a back pressure type steam turbine, which is characterized in that the back pressure type steam turbine is connected with a disproportionation circulating hydrogen compressor; the steam seal cooler is connected with the back pressure type steam turbine; the condensing steam turbine is connected with the isomerization circulating hydrogen compressor; the liquid collecting box is arranged at the bottom of the condensing steam turbine; the bottom of the drainage expansion box is communicated with the bottom of the liquid collection box; a condensate outlet of the steam seal cooler is connected to the drainage expansion box through a crossover line, and the crossover line is provided with a first gate valve. According to the utility model, the part of water is recycled to a condensed water pipe network through pipeline transformation, so that the waste of water resources is reduced, the consumption cost of public engineering sewage reagents is also reduced, and the effective combination of energy conservation and environmental protection is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to a chemical industry technical field, concretely is a kind of back pressure steam turbine steam seal cooler wastewater recovery system. BACKGROUND

[0002] Currently, the aromatics combined device is provided with disproportionation reaction circulating hydrogen compressor, and its power source is usually 3.5MPA back pressure steam turbine, which generates 1.0MPA steam and enters the pipe network. The back pressure steam turbine is provided with a steam seal cooler. The steam in the steam seal of the back pressure steam turbine is usually condensed into condensate water by a circulating water cooler. Since the pressure of the condensate water is low, it cannot return to the steam system, and thus needs to be discharged to a ditch. A large amount of condensate water is discharged every hour, and the subsequent sewage in the ditch needs to be treated, thus causing waste of water resources and increasing the load of sewage treatment. SUMMARY

[0003] In view of the defects of the prior art, the utility model provides a back pressure steam turbine steam seal cooler wastewater recovery system. The pipeline is reasonably arranged, the steam turbine pipeline of the isomerization compressor is re-calculated, the water quality of the part of water is analyzed, and the part of water is recovered to the condensate water pipe network through pipeline transformation, so as to reduce the waste of water resources, reduce the consumption cost of public engineering sewage reagent, and realize the effective combination of energy saving and environmental protection.

[0004] To achieve the above purpose, the utility model provides a back pressure steam turbine steam seal cooler wastewater recovery system, which comprises a disproportionation circulating hydrogen compressor, a back pressure steam turbine, a steam seal cooler, an isomerization circulating hydrogen compressor, a condensing steam turbine, a liquid collecting tank and a drain expansion tank. The back pressure steam turbine is connected to the disproportionation circulating hydrogen compressor. The steam seal cooler is connected to the back pressure steam turbine. The condensing steam turbine is connected to the isomerization circulating hydrogen compressor. The liquid collecting tank is arranged at the bottom of the condensing steam turbine and connected to the condensate water pipe network. The bottom of the drain expansion tank is communicated with the bottom of the liquid collecting tank. The condensate outlet of the steam seal cooler is connected to the drain expansion tank through a cross line, and the cross line is provided with a first gate valve.

[0005] Further, the cross line is provided with a pipeline heat tracing.

[0006] Further, the condensate outlet of the steam seal cooler is connected to an external discharge pipeline, the external discharge pipeline is provided with a second gate valve, and the cross line and the external discharge pipeline are connected at the upstream of the second gate valve.

[0007] Further, the side of the drain expansion tank is provided with a reserved port, and the reserved port is connected to the cross line.

[0008] Further, the cross line has a slope from the inlet to the outlet, and a topography of a position where the cross line meets the outer discharge line is higher than a topography of the reserved port.

[0009] Preferably, the slope of the cross line is 5℃.

[0010] Further, a bottom of the collecting tank is connected to a hot well tank through a collecting tank outlet line, and the hot well tank is connected to a condensate water pipe network.

[0011] Further, the collecting tank outlet line is provided with a collecting tank pump, and the inlet and outlet of the collecting tank pump are respectively provided with a third gate valve and a fourth gate valve.

[0012] Further, the hot well tank and the condensate water pipe network are connected through a hot well tank pump, and the inlet and outlet of the hot well tank pump are respectively provided with a fifth gate valve and a sixth gate valve.

[0013] The present application has the advantages that: by reasonably setting the pipeline, rechecking the steam turbine pipeline of the isomerization compressor, and analyzing the water quality of the water, the water is recycled to the condensate water pipe network through pipeline transformation, the waste of water resources is reduced, the consumption cost of public engineering sewage reagent is reduced, and the effective combination of energy saving and environmental protection is realized. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 The present application has the advantages that: by reasonably setting the pipeline, rechecking the steam turbine pipeline of the isomerization compressor, and analyzing the water quality of the water, the water is recycled to the condensate water pipe network through pipeline transformation, the waste of water resources is reduced, the consumption cost of public engineering sewage reagent is reduced, and the effective combination of energy saving and environmental protection is realized.

[0015] In the figure:

[0016] 100, disproportioning circulating hydrogen compressor,

[0017] 200, back pressure steam turbine,

[0018] 300, steam seal cooler, 310, outer discharge line, 311, second gate valve, 320, circulating water heat exchange pipeline,

[0019] 400, isomerization circulating hydrogen compressor,

[0020] 500, condensing steam turbine,

[0021] 600, collecting tank, 610, collecting tank outlet line, 611, collecting tank pump, 612, third gate valve, 613, fourth gate valve, 620, hot well tank, 621, hot well tank pump, 622, fifth gate valve, 623, sixth gate valve,

[0022] 700, drain expansion tank, 710, reserved port,

[0023] 800, cross line, 810, first gate valve, 820, pipe heat tracing,

[0024] 900, condensate water pipe network. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned purpose, features and advantages of the utility model more apparent, obvious and comprehensible, the specific embodiments of the utility model will be described in detail below with reference to the drawings. In the following description, a large number of specific details are set forth in order to fully understand the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0026] The utility model relates to a kind of back pressure steam turbine steam seal cooler waste water recovery system, including disproportionation cycle hydrogen compressor 100, back pressure steam turbine 200, steam seal cooler 300, isomerization cycle hydrogen compressor 400, condensing steam turbine 500, liquid collecting tank 600, and drain expansion tank 700;Back pressure steam turbine 200 is connected with disproportionation cycle hydrogen compressor 100;Steam seal cooler 300 is connected with back pressure steam turbine 200;Condensing steam turbine 500 is connected with isomerization cycle hydrogen compressor 400;Liquid collecting tank 600 is set to the bottom of condensing steam turbine 500, and liquid collecting tank 600 is connected to condensate water pipe network 900;The bottom of drain expansion tank 700 is communicated with the bottom of liquid collecting tank 600;Steam seal cooler 300 condensate outlet is connected to drain expansion tank 700 by cross line 800, and first gate valve 810 is installed in cross line 800.

[0027] The waste water discharged by back pressure steam turbine steam seal cooler 300 is collected to condensate water pipe network 900 and recycled, solves the situation of water resource waste.This part of water is reasonably recycled, reduces water resource consumption, simultaneously reduces the cost of sewage in public engineering sewage pool reagent treatment, and achieves energy saving and environmental protection.

[0028] It needs to be explained that when being specifically set in the embodiment, steam seal cooler 300 is a tube-shell heat exchanger, and circulating water heat exchange pipeline 320 is connected to the tube side of steam seal cooler 300, circulating water passes inside, and steam seal steam passes through shell side to exchange heat, circulating water inlet temperature is about 30 DEG C, and backwater temperature is about 40 DEG C.Back pressure steam turbine steam seal steam is extracted to the shell side of steam seal cooler 300 by steam vacuum extractor, and steam seal cooler 300 is cooled and condensed by circulating water, circulating water is heated by heat exchange, and steam seal cooler 300 condensate is recycled.

[0029] In an embodiment, cross line 800 is provided with pipe heat tracing 820.In specific setting, heat preservation cotton can be used in cross line 800 to protect pipe and heat preservation for pipe internal material, to further reduce the influence of weather on production.

[0030] In order to ensure that the disproportioning recycle hydrogen compressor 100 or the isomerization recycle hydrogen compressor 400 is used in an emergency under abnormal conditions, in an embodiment, the condensate outlet of the steam sealing cooler 300 is connected with a external discharge pipeline 310, the external discharge pipeline 310 is provided with a second gate valve 311, and the cross line 800 is connected with the external discharge pipeline 310 upstream of the second gate valve 311. In an emergency, the first gate valve 810 provided on the cross line 800 is closed, and the second gate valve 311 on the external discharge pipeline 310 is opened, so that the flow is changed to be discharged to the ditch through the external discharge pipeline 310.

[0031] In an embodiment, the side of the drain expansion tank 700 is provided with a reserved port 710, and the reserved port 710 is connected with the cross line 800. It should be noted that when the cross line 800 is specifically arranged and modified, a tee joint is added to the drain pipeline of the steam sealing cooler 300 at a position about 200 mm before the valve, and the tee joint is connected to the flange of the reserved port 710 near the drain expansion tank 700.

[0032] In order to ensure that the steam sealing condensate is smoothly pumped to the drain expansion tank 700 of the adjacent unit, in an embodiment, the position where the cross line 800 and the external discharge pipeline 310 meet is higher than the position of the reserved port 710, and the cross line 800 has a slope from the inlet to the outlet, so that the resistance is reduced.

[0033] Preferably, in the embodiment, the slope of the cross line is 5℃, and the slope is more reasonable.

[0034] In an embodiment, the bottom of the collecting tank 600 is connected to the hot well tank 620 through a collecting tank outlet pipeline 610, and the hot well tank 620 is connected to the condensate pipeline network 900.

[0035] In an embodiment, the collecting tank outlet pipeline 610 is provided with a collecting tank pump 611, and the inlet and outlet of the collecting tank pump 611 are respectively provided with a third gate valve 612 and a fourth gate valve 613. The collecting tank pump 611 is used to pump the condensate in the collecting tank 600 to the hot well tank 620.

[0036] Further, in an embodiment, the hot well tank 620 and the condensate pipeline network 900 are connected through a hot well tank pump 621, and the inlet and outlet of the hot well tank pump 621 are respectively provided with a fifth gate valve 622 and a sixth gate valve 623. The hot well tank pump 621 sends the materials in the hot well tank 620 to the condensate pipeline network 900 for recycling.

[0037] In the description of the utility model, need understanding is, the term "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and so on indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawing, just for the convenience of describing the utility model and simplifying the description, and not indicate or imply the device or element indicated must have a particular orientation, with a particular orientation configuration and operation, therefore can not be understood as the restriction of the utility model.

[0038] In addition, the terms "first", "second" are only for the purpose of description, and can not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one feature. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0039] In the utility model, unless otherwise specifically defined and limited, the terms "installation", "connection", "connection", "fixing" and other terms should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the communication or interaction relationship between two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0040] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature. It should be noted that when an element is referred to as "fixed to" or "provided on" another element, it can be directly on another element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and are not the only embodiment.

Claims

1. A wastewater recovery system for a back-pressure steam turbine steam seal cooler, characterized in that: include Disproportionation cycle hydrogen compressor; A back-pressure steam turbine is connected to the disproportionated cycle hydrogen compressor; A steam seal cooler is connected to the back-pressure steam turbine; Isomerization cycle hydrogen compressor; A condensing steam turbine is connected to the isomerized circulating hydrogen compressor; A liquid collection tank is located at the bottom of the condensing steam turbine and is connected to the condensate pipeline network; The hydrophobic expansion tank is connected at its bottom to the bottom of the liquid collection tank. The condensate outlet of the steam seal cooler is connected to the hydrophobic expansion tank via a crossover line, and a first gate valve is installed on the crossover line.

2. The wastewater recovery system for a back-pressure steam turbine steam seal cooler according to claim 1, characterized in that: The cross-line is equipped with pipe heat tracing.

3. A back-pressure steam turbine steam seal cooler wastewater recovery system according to claim 1 or 2, characterized in that: The condensate outlet of the steam seal cooler is connected to an external discharge pipeline, which is equipped with a second gate valve. The cross line and the external discharge pipeline meet upstream of the second gate valve.

4. The wastewater recovery system for a back-pressure steam turbine steam seal cooler according to claim 3, characterized in that: The hydrophobic expansion tank has a reserved opening on its side, which is connected to the crossover line.

5. A wastewater recovery system for a back-pressure steam turbine steam seal cooler according to claim 4, characterized in that: The terrain at the junction of the cross-line and the external discharge pipeline is higher than the terrain at the reserved opening, and the cross-line has a slope from the inlet to the outlet.

6. A wastewater recovery system for a back-pressure steam turbine steam seal cooler according to claim 5, characterized in that: The slope of the crossing is 5°C.

7. A back-pressure steam turbine steam seal cooler wastewater recovery system according to claim 1 or 2, characterized in that: The bottom of the collection tank is connected to the hot well tank via the collection tank outlet pipeline, and the hot well tank is connected to the condensate pipeline network.

8. A back-pressure steam turbine steam seal cooler wastewater recovery system according to claim 7, characterized in that: The outlet pipeline of the collection tank is equipped with a collection tank pump, and the inlet and outlet of the collection tank pump are respectively equipped with a third gate valve and a fourth gate valve.

9. A back-pressure steam turbine steam seal cooler wastewater recovery system according to claim 7, characterized in that: The hot well tank is connected to the condensate pipeline network by a hot well tank pump, and the inlet and outlet of the hot well tank pump are respectively equipped with a fifth gate valve and a sixth gate valve.

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