Nitrogen injection ash removal device for oil gas purification

Abstract

The utility model provides a nitrogen blowing deashing device for oil gas purification. The nitrogen blowing deashing device comprises a high-pressure nitrogen heating and storing system and a high-temperature and high-pressure nitrogen blowing deashing system, the high-pressure nitrogen heating storage system comprises a nitrogen storage tank, a high-temperature nitrogen storage tank and a high-temperature nitrogen bag which are sequentially connected through a pipeline; the high-temperature and high-pressure nitrogen blowing ash removal system comprises a plurality of blowing pipes which are respectively connected with the high-temperature nitrogen bag through pipelines; and electric heaters are arranged on the pipelines for connecting the nitrogen storage tank and the high-temperature nitrogen storage tank as well as the high-temperature nitrogen storage tank and the high-temperature nitrogen bag. Through the design of staged heating and hot air heat preservation of the outer jacket, the temperature of nitrogen is matched with the temperature of coal gas, the temperature difference is eliminated, tar condensation is avoided, and meanwhile continuity and stability of high-temperature ash removal are guaranteed; and through the injection control scheme of combining the high-temperature quick-opening ball valve and the butterfly valve, the problem of failure of a conventional pulse valve due to high temperature of a rubber diaphragm is effectively avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to high temperature tar-containing coal gas purification technical field, concretely relates to a nitrogen gas injection ash removal device for oil gas purification. BACKGROUND

[0002] Coking furnace gas and coal pyrolysis gas are high-temperature coal gas containing a large amount of dust and tar, in order to improve the yield and quality of recovered tar, dust needs to be completely separated from coal gas containing high-temperature gaseous tar, to ensure that the yield and quality of tar are higher in subsequent recovery processes, and pure coal gas is obtained, at present, most of the dry filters for high-temperature tar-containing coal gas adopt normal-temperature nitrogen gas pulse ash removal mode.

[0003] Normal-temperature nitrogen gas injection mainly has the following shortcomings: when tar in high-temperature coal gas encounters normal-temperature nitrogen gas, it may condense due to local temperature drop, forming sticky substances that gradually adhere to the surface of high-temperature filter material, which not only reduces ash removal efficiency, but also causes filter bag blockage, increases system pressure drop, and even requires frequent shutdown for cleaning or replacement of filter bags; when normal-temperature nitrogen gas is injected into a high-temperature environment, rapid volume expansion may cause uneven airflow distribution, incomplete ash removal in some areas, affect overall dust removal efficiency, and even form "ash bridges" or local penetration.

[0004] The pulse valve used in conventional nitrogen gas pulse injection has a maximum temperature resistance of 200 DEG C, for tar coal gas higher than 200 DEG C, since the pulse valve diaphragm is usually made of rubber or other elastic materials, high temperature will accelerate oxidation and hardening of the diaphragm, causing the diaphragm to become hard and brittle, thereby affecting its sealing performance and service life. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a nitrogen gas injection ash removal device for oil gas purification to solve the above-mentioned deficiencies of the prior art.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0007] A nitrogen gas injection ash removal device for oil gas purification, comprising a high-pressure nitrogen gas heating storage system and a high-temperature high-pressure nitrogen gas injection ash removal system, the high-pressure nitrogen gas heating storage system comprises nitrogen gas storage tanks, high-temperature nitrogen gas storage tanks and high-temperature nitrogen gas gas pockets connected in sequence by pipelines, the high-temperature high-pressure nitrogen gas injection ash removal system comprises a plurality of injection pipes connected to the high-temperature nitrogen gas gas pockets by pipelines, and electric heaters are arranged on the pipelines connecting the nitrogen gas storage tanks, the high-temperature nitrogen gas storage tanks and the high-temperature nitrogen gas gas pockets.

[0008] Further, the nitrogen gas storage tank is provided with a normal-temperature high-pressure nitrogen gas inlet, the normal-temperature high-pressure nitrogen gas is prepared by a nitrogen making machine, and the gas pressure of the normal-temperature high-pressure nitrogen gas is 0.3-0.5 Mpa.

[0009] Further, the tank surface of the high-temperature nitrogen gas tank and the high-temperature nitrogen gas pocket is provided with a heat preservation jacket, the heat preservation jacket comprises a hollow layer connected with a hot blast furnace and a heat preservation layer covering the outer surface of the hollow layer, the nitrogen temperature in the high-temperature nitrogen gas tank is 200℃, and the nitrogen temperature in the high-temperature nitrogen gas pocket is 400-500℃.

[0010] Further, the high-temperature nitrogen gas pocket is provided with a first high-temperature quick-opening ball valve at the gas inlet.

[0011] Further, the pipeline connecting the high-temperature nitrogen gas pocket and the blowing pipe comprises a dry pipe connected with the gas outlet of the high-temperature nitrogen gas pocket and a plurality of branch pipes connecting the dry pipe and each blowing pipe.

[0012] Further, the dry pipe is provided with a second high-temperature quick-opening ball valve, and each branch pipe is provided with a high-temperature quick-opening butterfly valve.

[0013] According to the above technical scheme, the nitrogen temperature is matched with the coal gas temperature through the design of staged heating and outer jacket hot blast heat preservation, the temperature difference is eliminated, the tar condensation is avoided, the continuity and stability of high-temperature soot removal are ensured, and the problem of high-temperature failure of the rubber diaphragm of the conventional pulse valve is effectively avoided through the blowing control scheme of the high-temperature quick-opening ball valve and butterfly valve combination. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a whole structure schematic view of the utility model;

[0015] In the figure: 1, nitrogen gas tank; 2, high-temperature nitrogen gas tank; 3, high-temperature nitrogen gas pocket; 4, electric heater; 5, heat preservation jacket; 6, high-temperature quick-opening ball valve; 7, first high-temperature quick-opening butterfly valve; 8, second high-temperature quick-opening butterfly valve; 9, blowing pipe. DETAILED DESCRIPTION

[0016] The preferred embodiment of the utility model will be described in detail in combination with the drawings.

[0017] As Figure 1The nitrogen blowing ash removal device for oil and gas purification includes a high-pressure nitrogen heating storage system A and a high-temperature high-pressure nitrogen blowing ash removal system B; the high-pressure nitrogen heating storage system includes nitrogen storage tanks 1, high-temperature nitrogen storage tanks 2 and high-temperature nitrogen gas pockets 3 connected by pipelines in sequence; the pipelines connecting the nitrogen storage tanks 1 and the high-temperature nitrogen storage tanks 2 and the high-temperature nitrogen storage tanks 2 and the high-temperature nitrogen gas pockets 3 are provided with electric heaters 4. The tank body surface of the high-temperature nitrogen storage tanks 2 and the high-temperature nitrogen gas pockets 3 is provided with a heat preservation jacket 5 including a hollow layer connected with a hot blast stove and a heat preservation layer covering the outer surface of the hollow layer, the nitrogen temperature in the high-temperature nitrogen storage tanks 2 is 200 DEG C, and the nitrogen temperature in the high-temperature nitrogen gas pockets 3 is 400-500 DEG C; the high-temperature quick-opening ball valve 6 is arranged at the gas inlet of the high-temperature nitrogen gas pocket 3. The hot blast jacket heat preservation storage tank, the high-temperature resistant metal sealing valve (instead of the rubber diaphragm) are adopted in the preferred embodiment to solve the problem that the traditional equipment cannot withstand 400-500 DEG C, then the staged heating (200 DEG C preheating and secondary heating to the target temperature) is adopted to reduce the instantaneous energy consumption, the nitrogen temperature is matched with the coal gas temperature by using the waste heat preservation of the hot blast stove, the temperature difference is eliminated, the tar condensation is avoided, the continuity and stability of the high-temperature ash removal are ensured, and the energy utilization rate is improved.

[0018] As shown in the figure, the high-temperature high-pressure nitrogen blowing ash removal system includes a plurality of blowing pipes 9 connected with the high-temperature nitrogen gas pockets 3 through pipelines; in specific use, the nitrogen storage tanks 1 are provided with gas inlets of normal-temperature high-pressure nitrogen, the normal-temperature high-pressure nitrogen is prepared by a nitrogen making machine, and the gas pressure of the normal-temperature high-pressure nitrogen is 0.3-0.5 Mpa; specifically, the nitrogen making machine adjusts and controls the output pressure and flow of the nitrogen by the adjusting valve connected with the nitrogen making machine and the nitrogen storage tanks 1 to ensure the stability and efficiency of the nitrogen making process. Figure 1 The pipeline connecting the high-temperature nitrogen gas pockets 3 and the blowing pipes 9 includes a main pipe connected with the gas outlets of the high-temperature nitrogen gas pockets 3 and a plurality of branch pipes connecting the main pipe and each blowing pipe; the main pipe is provided with a second high-temperature quick-opening ball valve 7, and each branch pipe is provided with a high-temperature quick-opening butterfly valve 8. The valve opening and closing sequence (ball valve→butterfly valve) and the dynamic switching of the gas storage system are adopted in the preferred embodiment to ensure the stability of the blowing pressure and avoid the "ash bridge" problem caused by the airflow disturbance under high temperature.

[0019]

[0020] ​The working process of the nitrogen blowing ash removal device for oil and gas purification in the preferred embodiment is as follows: the normal-temperature high-pressure nitrogen prepared by the nitrogen generator enters the nitrogen storage tank through the regulating valve; the nitrogen is heated to 200 DEG C for the first time through the electric heater 4 and is stored in the high-temperature nitrogen storage tank 2; the high-temperature nitrogen storage tank 2 is designed with an outer jacket hot air heating and heat preservation jacket 5, the hot air from the hot blast furnace enters the hot air heating and heat preservation jacket 5 to heat and preserve the high-temperature nitrogen storage tank 2; when the high-temperature nitrogen in the high-temperature nitrogen gas pocket 3 is consumed, the first high-temperature quick-opening ball valve 6 is opened, the high-temperature nitrogen at 200 DEG C is further heated to the required temperature (400-500 DEG C) through the electric heater 4 from the high-temperature nitrogen storage tank 2 and is stored in the high-temperature nitrogen gas pocket 3; the high-temperature nitrogen gas pocket 3 is designed with an outer jacket hot air heating and heat preservation jacket 5, the hot air from the hot blast furnace enters the hot air heating and heat preservation jacket 5 to heat and preserve the high-temperature nitrogen gas pocket 3; when the high-temperature high-pressure nitrogen is stored in the high-temperature nitrogen gas pocket 3, the blowing ash removal process is entered; the second high-temperature quick-opening ball valve 7 and the high-temperature quick-opening butterfly valve 8 are opened in sequence to blow and remove the ash from the blowing pipe 9; after the blowing is completed, the high-temperature quick-opening butterfly valve 8 and the second high-temperature quick-opening ball valve 7 are closed in sequence; then the first high-temperature quick-opening ball valve 6 is opened, the high-temperature nitrogen at 200 DEG C is further heated to the required temperature 400-500 DEG C through the electric heater 4 from the high-temperature nitrogen storage tank 2 and is stored in the high-temperature nitrogen gas pocket 3; when the high-temperature high-pressure nitrogen is stored in the high-temperature nitrogen gas pocket 3, the next blowing ash removal process is entered; the processes are sequentially cycled.

[0021] The above-described embodiments are merely preferred embodiments of the present application and are not intended to limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements to the technical solutions of the present application made by those skilled in the art shall fall within the protection scope of the claims of the present application.

Claims

1. A nitrogen sparging sootblower for use in the purification of oil and gas, characterized in that, The system comprises a high-pressure nitrogen heating storage system and a high-temperature high-pressure nitrogen blowing ash removal system; The high-pressure nitrogen heating storage system comprises nitrogen storage tanks, high-temperature nitrogen storage tanks and high-temperature nitrogen gas pockets connected in sequence by pipelines; The high-temperature high-pressure nitrogen blowing ash removal system comprises a plurality of blowing pipes connected to the high-temperature nitrogen gas pockets by pipelines; The pipelines connecting the nitrogen storage tanks, the high-temperature nitrogen storage tanks and the high-temperature nitrogen gas pockets are provided with electric heaters.

2. The nitrogen sparging sootblower for oil and gas purification according to claim 1, characterized in that, The nitrogen storage tanks are provided with gas inlets for normal-temperature high-pressure nitrogen, which is prepared by nitrogen making machines.

3. The nitrogen sparging device for oil and gas purification of claim 1, wherein, The surfaces of the tank bodies of the high-temperature nitrogen storage tanks and the high-temperature nitrogen gas pockets are provided with heat preservation jackets, which comprise hollow layers connected to hot blast furnaces and heat preservation layers covering the outer surfaces of the hollow layers.

4. The nitrogen sparging device for oil and gas purification of claim 1, wherein, The high-temperature nitrogen gas pockets are provided with first high-temperature quick-opening ball valves at gas inlets.

5. The nitrogen sparging device for oil and gas purification of claim 1, wherein, The pipelines connecting the high-temperature nitrogen gas pockets and the blowing pipes comprise dry pipes connected to gas outlets of the high-temperature nitrogen gas pockets and a plurality of branch pipes connecting the dry pipes and each blowing pipe.

6. The nitrogen sparging sootblower for oil and gas purification of claim 5, wherein, The dry pipes are provided with second high-temperature quick-opening ball valves, and each branch pipe is provided with a high-temperature quick-opening butterfly valve.

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