Delayed coking desulfurization and dust removal integrated washing tower

Abstract

The utility model discloses a delayed coking desulfurization and dust removal integrated washing tower. Comprising a washing tower body (1), an inlet flue (2) is arranged at the lower part of the washing tower body (1), an outlet flue (12) is arranged at the upper part of the washing tower body (1), a spraying layer is arranged in the washing tower body (1), a demister is arranged at the upper part of the spraying layer, and the spraying layer is divided into a lower alkali washing layer (3) and an upper water washing layer (5); a baffle plate demister (6) is arranged on the lower layer of the demister, and a fiber net demister (7) is arranged on the upper layer of the demister; a layer of liquid collecting tray (13) is arranged between the alkali washing layer (3) and the inlet flue (2), and a circle of composite plate (14) is arranged below each of the alkali washing layer (3) and the water washing layer (5). The device disclosed by the utility model is strong in pertinence, small in occupied area, simple to operate and capable of reliably, stably and continuously running; the petrochemical delayed coking system is subjected to waste gas desulfurization and dust removal cooperative treatment, and the problem of environmental pollution in the delayed coking industry is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of unorganized emission control of atmospheric pollutants, and in particular relates to an integrated washing tower for delayed coking, desulfurization and dust removal. Background Art

[0002] During the decoking and cooling process, tail gas containing oil and coke particles will be produced. Since there are a large number of sulfur compounds in petroleum, most of the gas produced is acidic. Direct emission into the air will accelerate the formation of acid rain, seriously pollute the environment, and also have irreversible effects on the human respiratory system. Environmental problems need to be solved urgently.

[0003] During the delayed coking process, there is a problem of large-scale, disorderly and random emission of waste gas. The waste gas collected in an orderly manner by delayed coking needs to be uniformly purified before being discharged to meet the standards. Summary of the Invention

[0004] The purpose of the utility model is to provide a delayed coking desulfurization and dust removal integrated washing tower to address the deficiencies in the existing technology. According to the characteristics of delayed coking exhaust gas, the exhaust gas is purified by dust removal and desulfurization to ensure that the exhaust gas can meet emission standards.

[0005] The technical solution of the utility model is: a delayed coking desulfurization and dust removal integrated washing tower, including a washing tower body, an inlet flue is arranged at the lower part of the washing tower body, and an outlet flue is arranged at the upper part; a spray layer is arranged in the washing tower body, and a demister is arranged above the spray layer, and the spray layer is divided into a lower alkali washing layer and an upper water washing layer; the lower layer of the demister is a baffle demister and the upper layer is a fiber mesh demister; a liquid collecting tray is arranged between the alkali washing layer and the inlet flue port, and a circle of composite plates is respectively provided below the alkali washing layer and the water washing layer.

[0006] Furthermore, the composite plate surrounds the inner wall of the washing tower and is inclined downward.

[0007] Furthermore, a steam heating pipe is provided at the upper outlet of the demister.

[0008] Furthermore, the water washing layer is composed of a water washing pipe and a water washing nozzle. The water washing pipe is connected to a water washing pump outside the washing tower body, and the other end of the water washing pump is connected to the bottom of the washing tower body.

[0009] Furthermore, the alkali washing layer is composed of an alkali washing pipeline and an alkali washing nozzle. The alkali washing pipeline is connected to an alkali washing pump outside the washing tower body, and the other end of the alkali washing pump is connected to the outlet of the liquid collecting tray.

[0010] Furthermore, a tray is provided between the alkali washing layer and the water washing layer; and an air lifting cap is provided on the tray.

[0011] The beneficial technical effects of the utility model are as follows:

[0012] (1) Most of the coke powder particles carried in the exhaust gas are removed through the water washing layer to achieve the purpose of dust removal;

[0013] (2) Removing acidic gas H2S entrained in the exhaust gas through the alkaline washing layer;

[0014] (3) The baffle demister captures the droplets through the inertia of the droplets to remove the larger mist droplets, liquid foam and trace solid particles entrained in the gas phase. The removal efficiency is greater than 95% and it is not easy to clog;

[0015] (4) The fiber mesh demister further reduces the droplets entrained in the gas phase. The demisting efficiency of droplets larger than 3 μm can reach over 98%, with low pressure drop, large specific surface area and high demisting efficiency.

[0016] (5) The steam heating pipe can increase the temperature of the exhaust gas, reduce the corrosion of the fan, and improve the combustion efficiency of the hot air furnace;

[0017] (6) The liquid collecting tray can evenly distribute the airflow and slurry, and at the same time enhance the desulfurization effect, and serve as a temporary maintenance platform during maintenance;

[0018] (7) The composite plate surrounds the inner wall of the scrubber and is tilted downward, which can guide the airflow passing through the wall, prevent the exhaust gas from escaping through the gap between the spray layer and the tower wall, enhance the desulfurization effect and improve the desulfurization efficiency;

[0019] (8) After exhaust gas purification, the H2S content at the outlet can be reduced to 15-30 mg / Nm 3 , the dust content can be reduced to 5-10mg / Nm 3 .

[0020] The closed device of the utility model has strong pertinence, small footprint, simple operation, and can operate reliably, stably, and continuously; it performs synergistic treatment of waste gas desulfurization and dust removal in the petrochemical delayed coking system, solving the problem of environmental pollution in the delayed coking industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of an integrated scrubber for delayed coking, desulfurization and dust removal.

[0022] In the figure: 1-washing tower body, 2-inlet flue, 3-alkaline washing layer, 4-tray, 5-water washing layer, 6-baffle demister, 7-fiber mesh demister, 8-steam heating pipe, 9-alkaline washing pump, 10-water washing pump, 11-lifting gas cap, 12-outlet flue, 13-liquid collecting tray, 14-composite plate. DETAILED DESCRIPTION

[0023] The present invention is described in detail below with reference to the accompanying drawings. Based on the technical solution of the present invention, a specific implementation plan is given, but the protection scope of the present invention is not limited thereto.

[0024] A delayed coking desulfurization and dust removal integrated washing tower includes a washing tower body 1, an inlet flue 2 is arranged at the lower part of the washing tower body 1, and an outlet flue 12 is arranged at the upper part. A spray layer is arranged in the washing tower body 1, and a demister is arranged above the spray layer. The spray layer is divided into a lower alkali washing layer 3 and an upper water washing layer 5; the lower layer of the demister is a baffle demister 6 and the upper fiber mesh demister 7; a liquid collection tray 13 is provided between the alkali washing layer 3 and the inlet flue 2, and a circle of composite plates 14 is provided below the alkali washing layer 3 and the water washing layer 5 respectively.

[0025] The waste gas generated by delayed coking enters and exits the washing tower from the bottom, undergoes desulfurization and dust removal inside the washing tower, and is finally discharged through the outlet pipe to meet the emission standards.

[0026] The water washing layer 5 is composed of a water washing pipe and a water washing nozzle. The water washing pipe is connected to the water washing pump 10 outside the washing tower body 1, and the other end of the water washing pump 10 is connected to the bottom of the washing tower body 1; the water washing pump 10 provides spraying for the water washing layer 5, which is in full contact with the exhaust gas in countercurrent to remove solid particulate matter.

[0027] The alkali washing layer 3 is composed of an alkali washing pipe and an alkali washing nozzle. The alkali washing pipe is connected to the alkali washing pump 9 outside the washing tower body 1, and the other end of the alkali washing pump 9 is connected to the outlet of the liquid collecting tray 13; the alkali liquid pump 9 provides alkali washing layer 3 spraying, which is in full contact with the exhaust gas in countercurrent to remove acidic gases.

[0028] After the exhaust gas from the scrubber passes through the inlet flue, it first passes through the liquid collecting tray 13 and then enters the spray layer to undergo alkali washing and water washing in sequence.

[0029] There is a circle of ALPD composite plates 14 under each spray layer of the scrubber to guide exhaust gas and improve reaction efficiency.

[0030] The exhaust gas from the scrubber demister first passes through the lower baffle demister 6 and then passes through the upper fiber mesh demister 7.

[0031] A steam heating pipe 8 is provided at the upper outlet of the scrubbing tower demister to increase the temperature of the outlet exhaust gas, which is beneficial for the exhaust gas after purification at the rear end to enter the hot blast furnace for combustion.

[0032] A tray 4 is provided between the alkali washing layer 3 and the water washing layer 5 ; an air lifting cap 11 is provided on the tray 4 .

[0033] Exhaust gas enters scrubber 1 through inlet flue 2. It is first evenly distributed through liquid collecting tray 13, where it undergoes gas-liquid enhanced desulfurization and impurity removal. It then passes through alkali wash layer 3, where the alkali absorbs acidic substances and removes some particulate matter. After evenly distributing the air through lift cap 11 above tray 4, it enters water wash layer 5, where countercurrent contact further removes dust particles, ultimately purifying the exhaust gas. The purified exhaust gas first passes through lower baffle demister 6 and upper fiber mesh demister 7 for defoaming, further removing droplets and fine particles, achieving gas-liquid separation.

[0034] The purified exhaust gas with reduced dust content and moisture content is then heated by the steam heating pipe 8 at the outlet flue 12, and enters the next process after the temperature rises.

[0035] To sum up, the above-mentioned implementation methods are all different ways of realizing the design concept of this utility model, but the protection scope of this utility model patent is not limited to this. Any engineering designer familiar with this technical field who processes and changes the content should be included in the protection scope of this utility model patent.

Claims

1. A delayed coking desulfurization and dust removal integrated washing tower, comprising a washing tower body (1), characterized in that The washing tower body (1) is provided with an inlet flue (2) at the lower part and an outlet flue (12) at the upper part; a spray layer is provided in the washing tower body (1); a demister is provided on the upper part of the spray layer; the spray layer is divided into a lower alkali washing layer (3) and an upper water washing layer (5); the lower layer of the demister is a baffle demister (6) and an upper fiber mesh demister (7); a liquid collecting tray (13) is provided between the alkali washing layer (3) and the inlet flue (2) port; and a circle of composite plates (14) are provided below the alkali washing layer (3) and the water washing layer (5), respectively.

2. The delayed coking desulfurization and dust removal integrated washing tower according to claim 1 is characterized in that The composite plate (14) surrounds the inner wall of the washing tower body (1) and is inclined downward.

3. The delayed coking desulfurization and dust removal integrated washing tower according to claim 1 is characterized in that A steam heating pipe (8) is provided at the upper outlet of the demister.

4. The delayed coking desulfurization and dust removal integrated washing tower according to claim 1 is characterized in that The water washing layer (5) is composed of a water washing pipe and a water washing nozzle. The water washing pipe is connected to a water washing pump (10) outside the washing tower body (1), and the other end of the water washing pump (10) is connected to the bottom of the washing tower body (1).

5. The delayed coking desulfurization and dust removal integrated washing tower according to claim 1 is characterized in that The alkali washing layer (3) is composed of an alkali washing pipeline and an alkali washing nozzle. The alkali washing pipeline is connected to an alkali washing pump (9) outside the washing tower body (1), and the other end of the alkali washing pump (9) is connected to the outlet of the liquid collecting tray (13).

6. The delayed coking desulfurization and dust removal integrated washing tower according to claim 1 is characterized in that A tray (4) is provided between the alkali washing layer (3) and the water washing layer (5); and an air lifting cap (11) is provided on the tray (4).

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