Condensate water recovery device for steam seal cooler of steam turbine of slurry bed residual oil hydrogenation device

Abstract

The utility model relates to the technical field of petrochemical engineering, in particular to a condensate water recovery device for a steam seal cooler of a steam turbine of a slurry bed residual oil hydrogenation device, which comprises the steam turbine, a steam seal air extractor, the steam seal cooler and a condensate water recovery mechanism. The steam seal air extractor is communicated with the steam seal cooler through a medium gas inlet pipeline, an outlet of the steam seal air extractor is communicated with the steam seal cooler through a mixed gas discharging pipeline, the steam seal cooler is communicated with the condensate water recycling mechanism through a first steam seal drainage pipeline, the condensate water recycling mechanism comprises a water collecting tank, and a booster pump is connected to the water collecting tank. The steam seal air extractor generates negative pressure to extract steam leaked by the steam turbine into the steam seal cooler to be cooled, condensate water enters the water collecting tank to be collected, the booster pump is intermittently started to discharge the condensate water in the water collecting tank to other process links to be used, waste of water resources and energy is reduced, and production cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of petrochemical technology, and in particular to a condensate recovery device for a turbine steam seal cooler in a slurry bed residue oil hydrogenation unit. Background Technology

[0002] Slurry bed residue hydrotreating units use low-quality vacuum residue and catalytic cracking slurry as feedstocks. Through hydrocracking, they produce liquefied petroleum gas (LPG), chemical raw materials, heavy naphtha, diesel, and vacuum wax oil. They can convert low-value-added products such as asphalt and coke into high-value-added clean oil products such as gasoline, kerosene, and diesel, significantly increasing light oil yield and maximizing the utilization of petroleum resources. The steam turbine plays a crucial role in the slurry bed residue hydrotreating unit. Using steam as the working medium, steam leakage occurs at the steam seal during operation, resulting in energy waste. The leaked steam, after cooling, precipitates a large amount of condensate. Existing slurry bed residue hydrotreating units either do not treat the precipitated condensate or have low efficiency in condensate recovery, leading to water waste and increased production costs.

[0003] Therefore, it is necessary to propose a condensate recovery device for the turbine steam seal cooler in a slurry bed residue oil hydrotreating unit to overcome the shortcomings of the existing technology. Utility Model Content

[0004] The purpose of this invention is to solve the problems in the prior art and provide a condensate recovery device for the turbine steam seal cooler in a slurry bed residue oil hydrogenation unit.

[0005] The technical solution of this utility model is:

[0006] A condensate recovery device for a turbine steam seal cooler in a slurry bed residue oil hydrotreating unit includes a steam turbine, a steam seal ejector, a steam seal cooler, and a condensate recovery mechanism. The steam seal cooler is connected to the steam turbine via a steam seal leakage ejection pipeline. One inlet of the steam seal ejector is connected to the steam seal cooler via a medium gas inlet pipeline, and the outlet of the steam seal ejector is connected to the steam seal cooler via a mixed gas discharge pipeline. The steam seal cooler is connected to the condensate recovery mechanism via a steam seal drain pipeline. The condensate recovery mechanism includes a water collection tank with a water tank baffle plate installed on the bottom surface inside the water collection tank. The lower end of the steam seal drain pipeline extends towards the bottom surface of the water collection tank, and the lower end surface of the steam seal drain pipeline is lower than the upper end surface of the water tank baffle plate. A booster pump is connected to the water collection tank.

[0007] Preferably, a pump inlet pipeline is provided between the water collection tank and the inlet of the booster pump, and a pump inlet valve and a pump inlet filter are sequentially installed on the pump inlet pipeline.

[0008] Preferably, the outlet end of the booster pump is provided with a pump outlet pipeline, and a pump outlet check valve, a pump outlet valve and a pump outlet regulating valve are sequentially installed on the pump outlet pipeline.

[0009] Preferably, a pump inlet venting pipeline is provided on the pump inlet pipeline, the pump inlet venting pipeline is located between the pump inlet valve and the pump inlet filter, and a pump inlet venting valve is provided on the pump inlet venting pipeline.

[0010] Preferably, the water collection tank is equipped with a level gauge and a water supply pipeline.

[0011] Preferably, a second steam seal drain pipe is provided between the water collection tank and the steam seal cooler, and the lower end face of the second steam seal drain pipe is higher than the lower end face of the first steam seal drain pipe.

[0012] Preferably, another inlet of the steam seal ejector is provided with a working steam line for supplying steam to the steam seal ejector.

[0013] Preferably, the steam seal cooler is equipped with a non-condensable gas discharge pipeline.

[0014] Preferably, the steam seal cooler is equipped with a circulating water inlet pipe and a circulating water outlet pipe.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This invention uses a steam seal ejector to generate negative pressure, drawing leaked steam from the steam seal teeth on both sides of the steam turbine into a steam seal cooler. The steam seal cooler cools the steam and condenses the steam into water. The condensate is collected in a water collection tank, and the water is discharged to other processes by intermittently turning on a booster pump. This reduces the waste of water and energy and lowers production costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the condensate recovery mechanism of this utility model.

[0019] The components include: 1. Steam turbine; 101. Steam seal teeth; 2. Steam seal ejector; 201. Working steam pipeline; 202. Medium gas inlet pipeline; 203. Mixed gas discharge pipeline; 204. Non-condensable gas discharge pipeline; 3. Steam seal cooler; 301. Steam seal leakage extraction pipeline; 302. Steam seal drain pipeline one; 303. Steam seal drain pipeline two; 304. Circulating water inlet pipeline; 305. Circulating water outlet pipeline; 4. Water collection tank; 401. Booster pump; 402. Pump inlet pipeline; 403. Pump outlet pipeline; 404. Level gauge; 405. Water tank baffle; 406. Makeup water pipeline; 407. Pump inlet valve; 408. Pump inlet filter; 409. Pump inlet vent valve; 410. Pump outlet check valve; 411. Pump outlet valve; 412. Pump outlet regulating valve. Detailed Implementation

[0020] To make the technical means, technical features, utility model purpose and technical effects of this utility model easier to understand, the present utility model will be further described below with reference to specific illustrations.

[0021] like Figures 1-2 As shown, a condensate recovery device for a steam turbine steam seal cooler in a slurry bed residue oil hydrogenation unit is disclosed. This utility model is used in conjunction with a steam turbine 1. The steam turbine 1 adapted to this utility model is a back-pressure steam turbine 1, and its working medium is steam. The steam driving the steam turbine 1 has a steam pressure higher than atmospheric pressure after it has done work in the steam turbine 1. This utility model includes a steam seal ejector 2, a steam seal cooler 3, and a condensate recovery mechanism. The steam seal cooler 3 is connected to the steam turbine 1 through a steam seal leakage ejection pipe 301. Specifically, the steam seal leakage ejection pipe 301 is divided into two lines and connected to the steam seal teeth 101 on both sides of the steam turbine 1 to facilitate the extraction of steam leaking from the steam seal teeth 101 on both sides.

[0022] One inlet of the steam seal ejector 2 is connected to the steam seal cooler 3 via the medium gas inlet pipe 202. The other inlet of the steam seal ejector 2 is connected to the working steam pipe 201. The working medium of the steam seal ejector 2 is steam. An external steam source is connected to the steam seal ejector 2 via the working steam pipe 201 to supply steam to the steam seal ejector 2. The steam seal ejector 2 adopts a nozzle structure, which accelerates the steam in the narrow channel, resulting in a significant increase in steam velocity. According to Bernoulli's principle, the increase in velocity will cause the pressure of the steam at the nozzle outlet to decrease, thus forming a negative pressure. The negative pressure draws the steam leaking from the steam seal tooth 101 into the steam seal cooler 3 for cooling through the medium gas inlet pipe 202 and the steam seal leakage ejection pipe 301. The condensate formed by cooling enters the condensate recovery mechanism for recycling and reuse.

[0023] like Figure 1 and Figure 2As shown, the condensate recovery mechanism includes a water collection tank 4 and a booster pump 401. The water collection tank 4 is made of stainless steel and is a closed, atmospheric pressure structure, which effectively prevents impurities in the air from entering the water collection tank 4 and contaminating the condensate. A water tank baffle 405 is welded to the bottom surface inside the water collection tank 4, dividing the interior of the water collection tank 4 into a water seal chamber. A water supply pipe 406 is connected to the side wall of the water collection tank 4 near the water seal chamber for injecting clean water into the water seal chamber of the water collection tank 4. The height of the water tank baffle 405 is determined according to the amount of clean water required to establish the water seal. The steam seal cooler 3 is connected to the water collection tank through steam seal drain pipe 1 302 and steam seal drain pipe 2 303. The tank 4 is connected, and the lower end of the steam seal drain pipe 302 extends towards the bottom of the water collection tank 4, inserts into the water seal chamber and is located below the water tank partition 405, that is, the lower end face of the steam seal drain pipe 302 is lower than the upper end face of the water tank partition 405, which is used to establish a water seal. The steam seal drain pipe 303 is inserted into the water collection tank 4, and the lower end face of the steam seal drain pipe 303 is higher than the lower end face of the steam seal drain pipe 302, which is used for the discharge of condensate from the steam seal cooler 3 to the water collection tank 4. A level gauge 404 is installed on the outer wall of the water collection tank 4. The level gauge 404 is connected to the inside of the water collection tank 4 and is used to indicate the liquid level in the water collection tank 4. The booster pump 401 is intermittently turned on according to the indication of the level gauge 404.

[0024] like Figure 2 As shown, a pump inlet pipe 402 connects the inlet of the booster pump 401 to the water collection tank 4. A pump inlet valve 407 and a pump inlet filter 408 are sequentially installed on the pump inlet pipe 402. A pump outlet pipe 403 connects to the outlet of the booster pump 401. A pump outlet check valve 410, a pump outlet valve 411, and a pump outlet regulating valve 412 are sequentially installed on the pump outlet pipe 403. By turning on the booster pump 401, the condensate collected in the water collection tank 4 is pressurized and then flows through the pump outlet pipe. 403 is discharged to other process stages within the public works demineralized water system. A pump inlet venting pipe is also connected to the pump inlet pipe 402. The pump inlet venting pipe is connected to the pump inlet pipe 402 between the pump inlet valve 407 and the pump inlet filter 408. A pump inlet venting valve 409 is installed on the pump inlet venting pipe. By opening the pump inlet valve 407 and the pump inlet venting valve 409, the water in the water collection tank 4 is vented, which facilitates related operations inside the water collection tank 4.

[0025] like Figure 1As shown, a non-condensable gas discharge pipe 204 is installed on the steam seal cooler 3. A mixed gas discharge pipe 203 is connected between the outlet of the steam seal ejector 2 and the steam seal cooler 3. The gas that is not completely condensed in the first stage mixes with the steam drawn in by the steam seal leakage ejector pipe 301 and then re-enters the steam seal ejector 2 through the medium gas inlet pipe 202. After that, it re-enters the steam seal cooler 3 through the mixed gas discharge pipe 203 for secondary cooling. The gas that cannot be condensed is discharged to the outside of the steam seal cooler 3 through the non-condensable gas discharge pipe 204 for unified recycling.

[0026] like Figure 1 As shown, the steam seal cooler 3 is equipped with a circulating water inlet pipe 304 and a circulating water outlet pipe 305. Cooling water enters the interior of the steam seal cooler 3 through the circulating water inlet pipe 304 to exchange heat with steam, cools the steam to condense water, and the cooled water after heat exchange is discharged from the steam seal cooler 3 through the circulating water outlet pipe 305 for recycling.

[0027] The working principle of this utility model is as follows:

[0028] In use, clean water is injected into the water collection tank 4 through the water supply pipe 406 until the water tank partition 405 is reached, establishing a water seal in the steam seal cooler 3 to prevent air from entering the steam seal cooler 3 and causing it to malfunction. The steam turbine 1 is started, and steam is supplied to the steam seal ejector 2 through the working steam pipe 201, causing the steam seal ejector 2 to establish a negative pressure. Under the action of negative pressure, the steam leaking from the steam seal teeth 101 on both sides of the steam turbine 1 is drawn into the steam seal cooler 3 through the steam seal leakage ejection pipe 301. After heat exchange with the circulating cooling water entering the steam seal cooler 3, condensate is precipitated. The precipitated condensate is discharged into the water collection tank 4 through the steam seal drain pipe 1 302 and the steam seal drain pipe 2 303. According to the indication of the level gauge 404 on the water collection tank 4, the booster pump 401 is intermittently turned on to discharge the condensate collected in the water collection tank 4 to other process stages for use.

[0029] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. All equivalent changes and modifications made in accordance with the scope of the claims of this utility model should fall within the technical scope of this utility model.

Claims

1. A slurry bed residue hydroprocessing unit turbine seal cooler condensate recovery apparatus comprising a turbine (1) characterized by: The steam seal air extractor (2), the steam seal cooler (3) and the condensate water recovery mechanism are further included, the steam seal cooler (3) is communicated with the steam turbine (1) through a steam seal leakage air extraction pipeline (301), one inlet of the steam seal air extractor (2) is communicated with the steam seal cooler (3) through a medium gas inlet pipeline (202), the outlet of the steam seal air extractor (2) is communicated with the steam seal cooler (3) through a mixed gas discharge pipeline (203), the steam seal cooler (3) is communicated with the condensate water recovery mechanism through a steam seal water drainage pipeline (302), the condensate water recovery mechanism includes a water collecting tank (4), a water tank partition (405) is arranged on the inner bottom surface of the water collecting tank (4), the lower end of the steam seal water drainage pipeline (302) extends to the bottom surface of the water collecting tank (4), the lower end surface of the steam seal water drainage pipeline (302) is lower than the upper end surface of the water tank partition (405), and the water collecting tank (4) is connected with a booster pump (401).

2. The slurry bed resid hydroprocessing plant turbine seal cooler condensate recovery apparatus of claim 1 wherein: The pump inlet pipeline (402) is arranged between the water collecting tank (4) and the inlet of the booster pump (401), and the pump inlet valve (407) and the pump inlet filter (408) are sequentially arranged on the pump inlet pipeline (402).

3. The slurry bed resid hydroprocessing unit turbine seal cooler condensate recovery apparatus of claim 1 wherein: The outlet end of the booster pump (401) is provided with the pump outlet pipeline (403), and the pump outlet one-way valve (410), the pump outlet valve (411) and the pump outlet adjusting valve (412) are sequentially arranged on the pump outlet pipeline (403).

4. The slurry bed resid hydroprocessing plant turbine seal cooler condensate recovery apparatus of claim 2 wherein: The pump inlet emptying pipeline is arranged on the pump inlet pipeline (402) and between the pump inlet valve (407) and the pump inlet filter (408), and the pump inlet emptying valve (409) is arranged on the pump inlet emptying pipeline.

5. The slurry bed resid hydroprocessing plant turbine seal cooler condensate recovery apparatus of claim 1 wherein: The liquid level meter (404) and the water supply pipeline (406) are arranged on the water collecting tank (4).

6. The slurry bed resid hydroprocessing plant turbine seal cooler condensate recovery apparatus of claim 1 wherein: The steam seal water drainage pipeline (303) is further arranged between the water collecting tank (4) and the steam seal cooler (3), and the lower end surface of the steam seal water drainage pipeline (303) is higher than the lower end surface of the steam seal water drainage pipeline (302).

7. The slurry hydrocarbon oil hydroprocessing unit turbine seal pot condensate water recovery apparatus of claim 1 wherein: The other inlet of the steam seal air extractor (2) is provided with the working steam pipeline (201) for providing steam to the steam seal air extractor (2).

8. The slurry hydrocarbon oil hydroprocessing unit turbine seal pot condensate water recovery apparatus of claim 1 wherein: The non-condensed gas discharge pipeline (204) is arranged on the steam seal cooler (3).

9. The slurry hydrocarbon oil hydroprocessing unit turbine seal pot condensate water recovery apparatus of claim 1 wherein: The circulating water inlet pipeline (304) and the circulating water outlet pipeline (305) are arranged on the steam seal cooler (3).

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