Desulfurization slurry cooler with pre-precipitation and on-line cleaning functions

Abstract

The utility model discloses a desulfurization slurry cooler with pre-precipitation and on-line cleaning functions. The desulfurization slurry cooler comprises a shell, a tube pass tube plate, a heat exchange tube, a filter screen and a scraper, the shell is vertically arranged, and the tube pass tube plates are arranged in inner cavities at the two ends of the shell, so that the inner cavity of the shell is divided into an upper part, a middle part and a lower part. The heat exchange tube is vertically arranged between the two tube pass tube plates in the shell, and the two ends of the heat exchange tube are connected with the through holes in the two tube pass tube plates in a sealed mode respectively. The filter screen is located below the lower tube pass tube plate, the scraping plate is vertically arranged and can horizontally rotate, the upper end face of the scraping plate is attached to the lower surface of the filter screen, and a first inlet facing the scraping plate is formed in the side wall of the shell. According to the desulfurization slurry cooler, desulfurization slurry can be filtered before entering the heat exchange pipes, the problem that the heat exchange pipes are prone to being blocked is solved, and the operation time of the desulfurization slurry cooler is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of desulfurization slurry coolers, in particular to a desulfurization slurry cooler with pre-precipitation and online cleaning functions. Background Art

[0002] At present, the waste heat utilization of desulfurization slurry is to connect a shell and tube cooler in parallel to the inlet or outlet pipe of the slurry circulation pump on the upper layer of the desulfurization tower. The desulfurization slurry is introduced into the tube side of the shell and tube heat exchanger; the shell side introduces raw water, heating return water or heating make-up water, and the desulfurization slurry transfers heat energy to raw water, heating return water or heating make-up water in the heat exchanger to recover heat energy. After heat energy recovery through the shell and tube cooler, the temperature of the top slurry is reduced, and the cooled slurry is in countercurrent contact with the flue gas for heat exchange to reduce the exhaust temperature, reduce the amount of water evaporated from the flue gas, reduce white smoke from the flue gas, and reduce the water consumption of the desulfurization system. The slurry waste heat is effectively utilized through the slurry cooler, which does not affect the existing operation mode of the desulfurization system and the desulfurization efficiency, and realizes the step-by-step high-efficiency and clean utilization of reducing the exhaust temperature and humidity, reducing white smoke from the flue gas, saving water and energy.

[0003] The desulfurization slurry cooler is generally installed vertically. The slurry is introduced from the bottom of the heat exchanger, first enters the lower cavity space of the heat exchanger, then flows through the heat exchanger tube, and finally leaves the heat exchanger from the upper cavity of the heat exchanger. The slurry flow rate in this process is variable, and the flow rate is the lowest in the heat exchange tube. The particle attachments carried by the slurry fluid will adhere to the inner wall of the heat exchange tube as the flow rate decreases. In addition, when designing a shell and tube cooler, in order to increase the heat transfer area per unit volume of the heat exchanger, the diameter of the heat exchange tube must be reduced, and specifications such as φ25 and φ19 are usually selected. However, a small tube diameter is more likely to cause particle attachment, resulting in a reduction in the flow area and resistance in the cooler tube. In severe cases, the heat exchange tube will be blocked. When the inside of the heat exchange tube is scaled or attached with dirt, it can only be cleaned with the help of an external cleaning system or by disassembling the heat exchanger. Frequent equipment disassembly will affect the normal operation of the waste heat system. Utility Model Content

[0004] The purpose of the utility model is to provide a desulfurization slurry cooler with pre-precipitation and online cleaning functions, which can filter the desulfurization slurry before it enters the heat exchange tube, alleviate the problem of easy blockage of the heat exchange tube, and increase the operating time of the desulfurization slurry cooler.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a desulfurization slurry cooler with both pre-precipitation and online cleaning functions, comprising a shell, a tube-side tube sheet, a heat exchange tube, a filter screen and a scraper; the shell is vertically arranged, and the tube-side tube sheets are arranged in the inner cavities at both ends; the heat exchange tube is vertically arranged between the two tube-side tube sheets in the shell, and the two ends of the heat exchange tube are respectively sealed and connected to the through holes on the two tube-side tube sheets; the filter screen is arranged below the lower tube-side tube sheet, the scraper is vertically arranged and can rotate horizontally, the upper end surface of the scraper is attached to the lower surface of the filter screen, and the side wall of the shell has a first inlet facing the scraper, the top wall of the shell has a first outlet, and the side wall of the shell is also provided with a second inlet and a second outlet.

[0006] Furthermore, the first inlet is tangentially arranged on the side wall of the shell, so that the entering desulfurization slurry can move along the inner wall of the shell.

[0007] Furthermore, the lower end of the scraper is rotatably connected to the support rod via a rotating shaft, and both ends of the support rod are fixed to the inner side wall of the shell so that the scraper can rotate horizontally.

[0008] Furthermore, a sewage outlet is arranged on the bottom surface of the shell to discharge impurities deposited on the bottom of the shell.

[0009] Furthermore, the scraper includes any one of a "I" shape, a "X" shape, a "M" shape, etc.

[0010] Furthermore, the filter screen is detachably fixed to the tube sheet via fasteners.

[0011] Beneficial effect: Compared with the prior art, the desulfurization slurry cooler with both pre-precipitation and online cleaning functions of the utility model can filter the desulfurization slurry entering the heat exchange tube by setting a filter under the tube plate of the tube side, maintain the cleanliness of the heat exchange tube for a long time, and ensure the heat exchange effect. At the same time, through the first inlet facing the scraper arranged on the side wall of the shell, the incoming desulfurization slurry drives the rotation of the scraper on the lower surface of the filter, and then the filter is cleaned online, that is, the desulfurization slurry is filtered while the filter can be cleaned in real time, ensuring the cleanliness of the filter and improving the filtering capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model.

[0013] Figure 2 It is an internal top view of the shell in the utility model.

[0014] In the figure: 1-shell, 2-tube sheet, 3-heat exchange tube, 4-filter, 5-scraper, 6-support rod, 101-first inlet, 102-first outlet, 103-second inlet, 104-second outlet, 105-drainage outlet. DETAILED DESCRIPTION

[0015] The following will be combined with the accompanying drawings and specific embodiments to clearly and completely describe the technical solution of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0016] refer to Figure 1 and Figure 2 The desulfurization slurry cooler with both pre-precipitation and online cleaning functions described in this embodiment includes: a shell 1, a tube-side tube sheet 2, a heat exchange tube 3, a filter 4 and a scraper 5. Specifically: the shell 1 is vertically arranged, and the tube-side tube sheets 2 are arranged in the inner cavities at both ends of the shell 1, so as to divide the inner cavity of the shell 1 into three parts: upper, middle and lower. The heat exchange tube 3 is vertically arranged between the two tube-side tube sheets 2 in the shell 1, and the two ends of the heat exchange tube 3 are respectively sealed and connected to the through holes on the two tube-side tube sheets 2. Normally, a plurality of heat exchange tubes 3 need to be arranged to ensure the heat exchange effect.

[0017] The filter screen 4 is located below the tube plate 2, and the scraper 5 is vertically arranged, which is a "cross" structure formed by connecting two plates (such as Figure 2 As shown in the figure), it can also be a "I"-shaped structure formed by one plate or a "M"-shaped structure formed by multiple plates. The lower end of the scraper 5 is rotatably connected to the support rod 6 through a rotating shaft so that the scraper 5 can rotate horizontally. The two ends of the support rod 6 are fixed on the inner side wall of the shell 1. The upper end surface of the scraper 5 is attached to the lower surface of the filter screen 4, and the side wall of the shell 1 has a first inlet 101 facing the scraper 5, the top wall of the shell 1 has a first outlet 102, and the side wall of the shell 1 is also provided with a second inlet 103 and a second outlet 104.

[0018] When in use, the separated slurry enters the housing 1 from the first inlet 101 to drive the scraper 5 to rotate, and then the separated slurry enters the heat exchange tube 3 after being filtered by the filter screen 4, so as to keep the heat exchange tube 3 clean for a long time and ensure the heat exchange effect. At the same time, through the first inlet 101 arranged on the side wall of the housing 1 facing the scraper 5, the entering separated slurry drives the rotation of the scraper 5 on the lower surface of the filter screen 4 (such as Figure 2 The filter screen is cleaned online to ensure the cleanliness of the filter screen and improve the filtering capacity.

[0019] refer to Figure 2 In a more preferred embodiment, the first inlet 101 of the desulfurized slurry cooler of the above embodiment is tangentially arranged on the side wall of the shell 1, so that the desulfurized slurry entering can move along the inner wall of the shell 1. In this embodiment, by tangentially arranging the first inlet 101 on the side wall of the shell 1, the desulfurized slurry entering can move along the inner wall of the shell 1, thereby generating a centrifugal effect, so that part of the attached objects in the desulfurized slurry adhere to the wall and deposit to the bottom, further reducing the attachments entering the heat exchange tubes.

[0020] refer to Figure 1 In another embodiment, a drain port 105 is provided on the bottom surface of the shell 1 of the desulfurization slurry cooler in the above embodiment to discharge impurities deposited at the bottom of the shell 1 .

[0021] In another embodiment, the filter screen 4 of the desulfurization slurry cooler of the above embodiment is fixed to the lower surface of the tube sheet 2 by fasteners such as bolts or screws, so that the filter screen 4 can be disassembled and replaced.

[0022] The technical contents not described in detail in this specification are all existing technologies known to those skilled in the art.

[0023] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A desulfurization slurry cooler with both pre-precipitation and online cleaning functions, characterized in that: include: A shell, a tube-side tube sheet, a heat exchange tube, a filter screen and a scraper; wherein: the shell is vertically arranged, and the tube-side tube sheets are arranged in the inner cavities at both ends of the shell; the heat exchange tube is vertically arranged between the two tube-side tube sheets in the shell, and the two ends of the heat exchange tube are respectively sealed and connected with the through holes on the two tube-side tube sheets; the filter screen is located below the lower tube-side tube sheet, the scraper is vertically arranged and can rotate horizontally, the upper end surface of the scraper is attached to the lower surface of the filter screen, and the side wall of the shell is provided with a first inlet facing the scraper, the top wall of the shell is provided with a first outlet, and the side wall of the shell is also provided with a second inlet and a second outlet.

2. The desulfurization slurry cooler with both pre-precipitation and online cleaning functions according to claim 1 is characterized in that: The first inlet is tangentially arranged on the side wall of the housing.

3. The desulfurization slurry cooler with both pre-precipitation and online cleaning functions according to claim 1 is characterized in that: The lower end of the scraper is rotatably connected to the support rod through a rotating shaft, and the two ends of the support rod are fixed on the inner side wall of the shell.

4. The desulfurization slurry cooler with both pre-precipitation and online cleaning functions according to claim 1 is characterized in that: A sewage outlet is arranged on the bottom surface of the shell.

5. The desulfurization slurry cooler with both pre-precipitation and online cleaning functions according to any one of claims 1 to 4, characterized in that: The scraper includes any one of a "I" shape, a "X" shape, and a "M" shape.

6. The desulfurization slurry cooler with both pre-precipitation and online cleaning functions according to any one of claims 1 to 4, characterized in that: The filter screen is detachably fixed to the tube sheet via fasteners.

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