Anti-corrosion device for temperature wire harness of dry pulverized coal gasifier

Abstract

The invention relates to the technical field of coal gasification, and discloses a dry pulverized coal gasification furnace temperature wire harness anti-corrosion device, which comprises a thermocouple sensor, the thermocouple sensor is a K-type thermocouple, and the armoring diameter is 4.5 mm; the connecting flange is made of stainless steel or austenitic stainless steel, and the sealing surface of the connecting flange is made of nickel-based alloy; a secondary sealing wire harness (100), wherein the secondary sealing wire harness (100) adopts a bundling structure; the valve group consists of a high-pressure nitrogen isolating valve, an inlet valve and an outlet valve; according to the invention, the sealing device is modified to isolate synthesis gas from entering the temperature sleeve chamber, so that the workload of maintenance and overhaul is reduced, and the loss of manpower is further reduced; and by reselecting a sealing method, the cost of the whole system equipment is controlled, meanwhile, the maintenance and overhaul difficulty is reduced, and the service life of the temperature element is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of coal gasification, and in particular to a temperature harness anti-corrosion device for a dry coal powder gasification furnace. Background Art

[0002] The existing high-pressure pulverized coal pressurized gasification device is equipped with many water-cooled wall temperature sensors for measuring the internal medium temperature. Generally, the thermocouple temperature element is armored and connected through the flange hole on the outer wall of the device.

[0003] Under the long-term action of high pressure (>3MPa) in the gasification device, the synthetic gas will slightly penetrate into the sealing cavity through the ferrule joint, and its condensate will corrode the secondary sealing harness and the thermocouple joint, causing inaccurate measurement.

[0004] (1) The equipment is complex in structure, cumbersome in operation, with high manpower consumption and poor stability in long-term operation;

[0005] (2) Temperature elements are group outputs. When a fault occurs, they need to be replaced in groups. The purchase price of temperature elements and sealed wiring harnesses is relatively high.

[0006] (3) When the temperature is not monitored, the control accuracy of the gasification device is reduced, which seriously affects the input control of materials such as coal, pure oxygen, and water vapor, and affects the safe operation of the gasification device. Summary of the invention

[0007] In view of the above problems existing in the temperature harness anti-corrosion device of the existing dry coal powder gasification furnace, the present invention is proposed.

[0008] Therefore, the object of the present invention is to provide a dry coal powder gasification furnace temperature harness anti-corrosion device, the purpose of which is to solve the sealing problem and prevent the synthesis gas from leaking into the temperature sleeve chamber.

[0009] To solve the above technical problems, the present invention provides the following technical solutions: a dry coal powder gasification furnace temperature harness anti-corrosion device includes a thermocouple sensor, which is a K-type thermocouple with an armored diameter of 4.5 mm; a connecting flange, which is made of stainless steel or austenitic stainless steel, and the sealing surface of the connecting flange is made of nickel-based alloy; a secondary sealing harness, which adopts a cluster structure; a valve group, which is composed of a high-pressure nitrogen isolation valve, an inlet valve and an outlet valve; a temperature sleeve, and the compression fitting of the temperature sleeve adopts a split graphite seal.

[0010] As a preferred solution of the temperature harness anti-corrosion device for the dry coal powder gasification furnace of the present invention, a hole is opened on the temperature sleeve.

[0011] As a preferred solution of the temperature harness anti-corrosion device for the dry pulverized coal gasifier of the present invention, the high-pressure nitrogen isolation valve, the inlet valve and the outlet valve are arranged on the temperature sleeve.

[0012] As a preferred solution of the temperature harness anti-corrosion device for the dry pulverized coal gasifier of the present invention, the high-pressure nitrogen isolation valve is arranged at the orifice opened on the temperature sleeve to control the nitrogen entering the temperature sleeve.

[0013] As a preferred solution of the temperature harness anti-corrosion device for the dry pulverized coal gasifier described in the present invention, a pressure reducing device and a flow measuring device are installed on one side of the high-pressure nitrogen isolation valve to adjust and monitor the pressure and flow of nitrogen entering the temperature sleeve.

[0014] As a preferred solution of the temperature harness anti-corrosion device for the dry pulverized coal gasifier of the present invention, the inlet valve and the outlet valve are respectively located upstream and downstream of the pressure reducing device and the flow measuring device to control the inlet and outlet of nitrogen.

[0015] As a preferred solution of the temperature harness anti-corrosion device for the dry pulverized coal gasifier of the present invention, high-pressure nitrogen is filled into the temperature sleeve through the high-pressure nitrogen isolation valve to form an inert gas environment to prevent synthesis gas from entering the chamber of the temperature sleeve.

[0016] As a preferred solution of the temperature harness anti-corrosion device for the dry coal powder gasifier of the present invention, when the flow measuring device displays no nitrogen flow indication, it indicates that there is no leakage; when the flow measuring device displays a nitrogen flow indication, it indicates that there is a leakage.

[0017] As a preferred solution of the temperature harness anti-corrosion device for the dry pulverized coal gasifier described in the present invention, when the high-pressure nitrogen supply is interrupted, the high-pressure nitrogen isolation valve and the inlet valve are closed, and the outlet valve is opened periodically to eliminate the possible accumulation of trace leakage gas and condensate.

[0018] As a preferred solution of the temperature harness anti-corrosion device for the dry coal powder gasifier of the present invention, the split graphite seal is combined with the connecting flange to improve the sealing performance.

[0019] The beneficial effects of the present invention are as follows: by modifying the sealing device, the synthesis gas is isolated from entering the temperature sleeve chamber, the workload of maintenance and overhaul is reduced, and thus the loss of manpower is reduced; by reselecting the sealing method, the cost of the entire system equipment is controlled, while the difficulty of maintenance and overhaul is reduced, and the service life of the temperature element is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0023] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0024] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0025] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0026] Example 1

[0027] Reference Figure 1 , which is the first embodiment of the present invention, provides a dry coal powder gasification furnace temperature harness anti-corrosion device, which includes a thermocouple sensor 500, which is a K-type thermocouple with an armored diameter of 4.5 mm; a connecting flange 400, which is made of stainless steel or austenitic stainless steel, and a sealing surface of the connecting flange 400 is made of nickel-based alloy.

[0028] Specifically, the secondary sealing harness 100 and the secondary sealing harness 100 adopt a cluster structure; the valve group is composed of a high-pressure nitrogen isolation valve 700, an inlet valve 600 and an outlet valve 800; the temperature sleeve 200 and the ferrule joint 300 of the temperature sleeve 200 adopt a split graphite seal.

[0029] Furthermore, a hole is opened on the temperature sleeve 200 , and a high-pressure nitrogen isolation valve 700 , an inlet valve 600 and an outlet valve 800 are arranged on the temperature sleeve 200 .

[0030] Among them, the thermocouple sensor 500 uses a K-type thermocouple with an armor diameter of 4.5mm, which is used to accurately measure the temperature of the medium inside the gasifier. The K-type thermocouple is known for its wide temperature measurement range and good stability, and is particularly suitable for temperature monitoring in high temperature environments.

[0031] The connection flange 400 is used as the interface between the thermocouple sensor 500 and the external pipeline or equipment. Its material is stainless steel or austenitic stainless steel, which ensures sufficient strength and corrosion resistance. The sealing surface of the connection flange 400 is made of nickel-based alloy such as Inconel600, which further enhances the corrosion resistance of the sealing surface and ensures long-term stable operation.

[0032] In order to improve the sealing problem existing in the original technology, the device adopts a split graphite seal to replace the traditional ferrule seal. This seal improves the sealing performance of the flange joint surface, effectively prevents corrosive substances such as synthesis gas from entering the temperature sleeve 200, and reduces the risk of corrosion.

[0033] The secondary sealing harness 100 adopts a cluster structure, which can effectively seal the medium in the secondary sealing cavity when the thermocouple armor is damaged and internal leakage occurs, thereby avoiding potential harm caused by medium leakage and ensuring the accuracy of measurement.

[0034] In addition, a valve group consisting of a high-pressure nitrogen isolation valve 700, an inlet valve 600 and an outlet valve 800 is installed on the temperature sleeve 200. The arrangement of these valves allows a nitrogen-tight environment to be formed inside the temperature sleeve 200. By injecting nitrogen with a pressure higher than that inside the gasifier, not only is the synthesis gas prevented from entering the temperature sleeve 200, but also when a seal leaks, the high-pressure nitrogen can reversely enter the gasifier, further preventing the intrusion of the synthesis gas. At the same time, by adjusting the state of the valve, air replacement and leakage detection can be conveniently performed.

[0035] The design of the temperature sleeve 200 has also been improved, especially the ferrule joint 300 has been replaced with a split graphite seal, which corresponds to the seal on the connecting flange 400, forming a double sealing mechanism, significantly improving the overall sealing effect. The holes opened on the temperature sleeve 200 allow the installation of a high-pressure nitrogen isolation valve 700, an inlet valve 600 and an outlet valve 800, ensuring the effective injection and control of nitrogen.

[0036] In summary, this device not only solves the corrosion problem caused by poor sealing in traditional technology, but also simplifies the operation process, reduces maintenance costs, and greatly improves the stability and safety of the dry coal powder gasification furnace temperature measurement system.

[0037] Example 2

[0038] Reference Figure 1 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: a high-pressure nitrogen isolation valve 700 is arranged at the orifice opened on the temperature sleeve 200 to control the nitrogen entering the temperature sleeve 200.

[0039] Furthermore, a high-pressure nitrogen isolation valve 700 is provided at an orifice provided on the temperature sleeve 200 to control the nitrogen from entering the temperature sleeve 200. An inlet valve 600 and an outlet valve 800 are respectively located upstream and downstream of the pressure reducing device and the flow measuring device to control the inlet and outlet of the nitrogen.

[0040] Furthermore, high-pressure nitrogen is filled into the temperature sleeve 200 through the high-pressure nitrogen isolation valve 700 to form an inert gas environment to prevent the synthesis gas from entering the chamber of the temperature sleeve 200. When the flow measurement device displays no nitrogen flow indication, it indicates that there is no leakage. When the flow measurement device displays a nitrogen flow indication, it indicates that there is a leakage. When the high-pressure nitrogen supply is interrupted, the high-pressure nitrogen isolation valve 700 and the inlet valve 600 are closed, and the outlet valve 800 is opened periodically to eliminate the trace leakage gas and condensate that may accumulate.

[0041] Specifically, a split graphite seal is combined with the connecting flange 400 to improve the sealing performance.

[0042] In summary, the high-pressure nitrogen isolation valve 700 is arranged at the orifice opened on the temperature sleeve 200, and its main function is to control the high-pressure nitrogen to enter the temperature sleeve 200, thereby forming a nitrogen-tight environment in the temperature sleeve 200. This environment is crucial to prevent corrosive gases such as synthesis gas from entering the temperature sleeve 200, because the components in the synthesis gas, such as H2S, are extremely corrosive. Once entering the interior of the temperature sleeve 200, it will cause serious damage to the temperature element and its related components.

[0043] Furthermore, in addition to the high-pressure nitrogen isolation valve 700, there are also an inlet valve 600 and an outlet valve 800, which are respectively located upstream and downstream of the pressure reducing device and the flow measuring device. These three valves work together to jointly manage the flow of nitrogen in the temperature sleeve 200. When it is necessary to fill the temperature sleeve 200 with high-pressure nitrogen, first open the high-pressure nitrogen isolation valve 700 and the inlet valve 600, adjust the appropriate nitrogen pressure through the pressure reducing device, and monitor the nitrogen flow with the help of the flow measuring device, and then the nitrogen can smoothly enter the temperature sleeve 200. Subsequently, open the outlet valve 800 for air replacement until it is confirmed that the pressure reducing device and the flow measuring device are working properly, and finally close the outlet valve 800 to maintain a nitrogen closed environment.

[0044] Furthermore, by filling the thermowell 200 with high-pressure nitrogen, an inert gas environment can be effectively formed, which not only prevents the synthesis gas from entering the chamber of the thermowell 200, but also provides a more stable measurement condition for the temperature element. When the flow measurement device shows no nitrogen flow indication, it means that the nitrogen seal is good and there is no leakage; on the contrary, if the flow measurement device shows a nitrogen flow indication, it indicates that there may be a leakage, and immediate measures need to be taken to check and repair it.

[0045] In addition, when the high-pressure nitrogen supply is interrupted, the high-pressure nitrogen isolation valve 700 and the inlet valve 600 can be closed in time to prevent the invasion of external gas, and the outlet valve 800 can be opened regularly to discharge the trace leakage gas and condensate that may accumulate in the chamber of the temperature sleeve 200. This can effectively prevent these substances from corroding the temperature sleeve 200 and its connecting parts, thereby improving the reliability and service life of the entire system.

[0046] By rationally arranging the high-pressure nitrogen isolation valve 700, the inlet valve 600 and the outlet valve 800, and combining the pressure reducing device and the flow measuring device, this technical solution not only effectively realizes the nitrogen sealing inside the temperature sleeve 200, but also provides a simple and reliable leakage detection method, which greatly improves the operating safety and maintenance convenience of the dry coal powder gasification furnace temperature measurement system.

[0047] Example 3

[0048] Reference Figure 1 , which is the third embodiment of the present invention.

[0049] The operation process of this device is as follows: ensure that all valves are in the closed state, that is, the high-pressure nitrogen isolation valve 700, the inlet valve 600 and the outlet valve 800 are all closed, open the high-pressure nitrogen isolation valve 700 and the inlet valve 600, and fill the temperature sleeve 200 with high-pressure nitrogen with a differential pressure higher than the internal pressure of the gasifier> 0.56MPa by adjusting the pressure reducing device. At this time, the high-pressure nitrogen acts as an isolation gas to form a nitrogen-tight environment, effectively preventing the synthesis gas from entering the temperature sleeve 200, open the outlet valve 800, let the nitrogen fill the temperature sleeve 200 and replace the original air inside, until it is confirmed that the pressure reducing device and the flow measurement device are working properly. This step helps to ensure that the interior of the temperature sleeve 200 is completely filled with nitrogen without any residual air.

[0050] When the nitrogen replacement is completed, the outlet valve 800 is closed to form a stable nitrogen closed environment. At this time, the inside of the temperature sleeve 200 should be a safe space without synthesis gas and other corrosive substances. During normal operation, the high-pressure nitrogen isolation valve 700 and the inlet valve 600 are kept open to maintain a continuous supply of nitrogen. The nitrogen flow rate is monitored by a flow measurement device. If an abnormal flow rate is found, that is, there is a nitrogen flow indication, it indicates that there may be a leak, which needs to be marked and planned for subsequent treatment.

[0051] Check the flow measurement device regularly. If the flow measurement device shows no nitrogen flow reading, it means that the system is well sealed and no additional treatment is required; on the contrary, if there is a nitrogen flow reading, it indicates that there is a leak and it needs to be handled in time.

[0052] When the high-pressure nitrogen supply is interrupted, quickly close the high-pressure nitrogen isolation valve 700 and the inlet valve 600 to prevent the synthesis gas from flowing back. Open the outlet valve 800 regularly to discharge the trace amount of leaked gas and condensate that may accumulate in the temperature sleeve 200 to prevent these substances from corroding the temperature sleeve 200 and the connecting parts.

[0053] When the flow measurement device indicates a leak, use the device maintenance opportunity to fix the leak point, replace damaged split graphite seals or other damaged parts, and ensure that the device returns to normal operation.

[0054] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0055] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0056] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A temperature harness anti-corrosion device for a dry coal powder gasifier, characterized in that: include, A thermocouple sensor (500), wherein the thermocouple sensor (500) is a K-type thermocouple with an armor diameter of 4.5 mm; A connecting flange (400), wherein the connecting flange (400) is made of stainless steel or austenitic stainless steel, and the sealing surface of the connecting flange (400) is made of a nickel-based alloy; A secondary sealing wire harness (100), wherein the secondary sealing wire harness (100) adopts a cluster structure; A valve group, comprising a high-pressure nitrogen isolation valve (700), an inlet valve (600) and an outlet valve (800); A temperature sleeve (200), wherein a ferrule joint (300) of the temperature sleeve (200) adopts a split graphite seal.

2. The temperature harness anti-corrosion device for a dry coal powder gasifier according to claim 1, characterized in that: The temperature sleeve (200) is provided with a hole.

3. The temperature harness anti-corrosion device for a dry pulverized coal gasifier according to claim 2, characterized in that: The high-pressure nitrogen isolation valve (700), the inlet valve (600) and the outlet valve (800) are arranged on the temperature sleeve (200).

4. The dry coal powder gasification furnace temperature harness anti-corrosion device according to claim 3, characterized in that: The high-pressure nitrogen isolation valve (700) is arranged at the orifice opened on the temperature sleeve (200) and is used to control the nitrogen to enter the temperature sleeve (200).

5. The temperature harness anti-corrosion device for a dry coal powder gasifier according to claim 4, characterized in that: A pressure reducing device and a flow measuring device are installed on one side of the high-pressure nitrogen isolation valve (700) for adjusting and monitoring the pressure and flow of nitrogen entering the temperature sleeve (200).

6. The temperature harness anti-corrosion device for a dry coal powder gasifier according to claim 5, characterized in that: The inlet valve (600) and the outlet valve (800) are respectively located upstream and downstream of the pressure reducing device and the flow measuring device, and are used to control the inlet and outlet of nitrogen.

7. The temperature harness anti-corrosion device for a dry coal powder gasifier according to claim 6, characterized in that: High-pressure nitrogen is filled into the temperature sleeve (200) through the high-pressure nitrogen isolation valve (700) to form an inert gas environment to prevent synthesis gas from entering the chamber of the temperature sleeve (200).

8. The temperature harness anti-corrosion device for a dry pulverized coal gasifier according to claim 7, characterized in that: When the flow measurement device displays no nitrogen flow indication, it indicates that there is no leakage. When the flow measurement device displays a nitrogen flow indication, it indicates that there is a leakage.

9. The dry coal powder gasification furnace temperature harness anti-corrosion device according to claim 8, characterized in that: When the high-pressure nitrogen supply is interrupted, the high-pressure nitrogen isolation valve (700) and the inlet valve (600) are closed, and the outlet valve (800) is opened periodically to remove the trace amount of leaked gas and condensate that may have accumulated.

10. The temperature harness anti-corrosion device for a dry pulverized coal gasifier according to claim 9, characterized in that: The split graphite seal is combined with the connecting flange (400) to improve the sealing performance.

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