Inner cone odorization device and odorization method

Abstract

The invention relates to the technical field of gas odorization, and particularly discloses an inner cone odorization device and an odorization method. The inner cone odorization device comprises a pipe body connected with a natural gas main pipeline, a throttling body located in the pipe body, a pressure detection assembly used for detecting the pressure of the throttling body at the two ends in the axial direction of the pipe body, a conveying pump assembly communicated with the throttling body through a pipeline and located on the outer side of the pipe body, and a control assembly connected with the pressure detection assembly and the conveying pump assembly. A cavity of a cone structure is formed in the throttling body. The delivery pump assembly is communicated with the small end of the cavity; and a liquid injection pipe communicated with the cavity is arranged on the outer side of the cone structure. The invention also discloses a use method thereof. According to the present invention, the disadvantages of non-uniform odorizing agent mixing, insufficient odorizing, large volume and the like of the traditional odorizing device are overcome.

Description

Technical Field

[0001] The invention relates to the technical field of natural gas odorization, and more particularly to an inner cone odorization device and an odorization method. Background Art

[0002] Due to the physical properties of natural gas, which is colorless, odorless, flammable and explosive, it is very easy to have unnoticeable gas leakage, leading to natural gas poisoning, fire, explosion and other safety accidents, causing losses to people's property safety and even life safety. In the natural gas industry, odorizing natural gas is an important link to ensure the safe transportation of natural gas, which is a requirement of national technical regulations and is related to the safe use and quality assurance of urban natural gas.

[0003] Natural gas odorization is the process of injecting a unique, unpleasant odorant into natural gas to ensure that natural gas leaks can be detected. Odorants are organic compounds or mixtures with strong odors. When they are added to natural gas at very low concentrations, the natural gas will have a special, unpleasant, warning odor so that leaked natural gas can be detected when it reaches 5% of the lower explosion limit or reaches a concentration that is harmful to the human body.

[0004] Currently, the use of odorizers requires drilling holes in the natural gas pipeline and connecting matching flow meters to measure the flow and calculate the amount of odorous organic matter added, which can easily lead to the risk of natural gas leakage.

[0005] In addition, the existing odorizers have the problems of bulky size, complex control process and uneven odorization.

[0006] At present, the traditional odorizing device is to open a hole in the gas pipeline and install a matching flow meter. The flow meter is used to measure the natural gas flow, and the odorant is injected into the natural gas pipeline through a pump. This method has certain safety hazards because it requires opening a hole in the pipeline and installing an odorizer. At the same time, the traditional odorizing device directly injects the odorant into the natural gas pipeline. The odorant fails to fully mix with the natural gas, which easily leads to the odorant concentration at the end of the pipeline not meeting the standard. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide an inner cone odorizing device and an odorizing method, and to overcome the disadvantages of uneven odorant mixing, insufficient odorizing and large size of the traditional odorizing device.

[0008] The solution adopted by the present invention to solve the technical problem is:

[0009] An inner cone odorizing device comprises a pipe body connected to a natural gas main pipeline, a throttle body located in the pipe body, a pressure detection assembly for detecting the pressure at both ends of the throttle body along the axial direction of the pipe body, a delivery pump assembly connected to the throttle body through a pipeline and located outside the pipe body, and a control assembly respectively connected to the pressure detection assembly and the delivery pump assembly;

[0010] A cavity in a cone structure is arranged inside the throttling body, and a liquid injection pipe connected to the cavity is arranged outside the cone structure; the delivery pump assembly is connected to the small end of the cavity;

[0011] In some possible implementations,

[0012] The axis of the throttle body is coaxially arranged with the axis of the tube body; the throttle body is in a cone structure, and the large end of the throttle body is arranged on the same side as the large end of the cavity.

[0013] In some possible implementations,

[0014] The pressure detection component includes a differential pressure transmitter connected to the control assembly, a high-pressure pressure-taking pipe connected to the differential pressure transmitter and located on the small end side of the throttle body, and a low-pressure pressure-taking pipe connected to the differential pressure transmitter and located on the small end side of the throttle body; the high-pressure pressure-taking pipe and the low-pressure pressure-taking pipe are located in the pipe body.

[0015] In some possible implementations,

[0016] The low-pressure pressure-taking pipe comprises a pressure-taking pipeline coaxially arranged with the throttle body and penetrating the throttle body, a connecting pipe connected to one end of the pressure-taking pipeline close to the small end of the throttle body, and the other end of the connecting pipe passes through the pipe body and is connected to the differential pressure transmitter.

[0017] In some possible implementations,

[0018] The delivery pump assembly comprises a liquid outlet pipe whose one end is connected to one side of the small end of the throttling body, a pump body connected to the other end of the liquid outlet pipe, and a liquid delivery pipe connected to the pump body.

[0019] In some possible implementations,

[0020] A check valve is arranged on the liquid outlet pipe.

[0021] In some possible implementations,

[0022] The control assembly is installed on the outside of the tube body, and includes a control unit connected to the pressure detection component, a drive module connected to the control unit and the infusion pump component respectively, and a display module and a power supply module connected to the control unit respectively.

[0023] In some possible implementations,

[0024] The injection tubes are multiple groups and are arranged along the circumference of the throttle body, and multiple groups of injection holes are arranged on each group of the injection tubes.

[0025] An odorizing method of the inner cone odorizing device as described above specifically comprises the following steps:

[0026] Step S1: The delivery pump assembly pre-fills the odorant so that the odorant pre-fills the cavity in the throttle body;

[0027] Step S2: The pressure detection component detects the pressure at the front and rear ends of the throttle body along the axial direction of the tube body, and transmits the detection data to the control assembly, which calculates the natural gas flow rate based on the pressure difference information;

[0028] Step S3: the control assembly controls the amount of odorant added to the cavity according to the natural gas flow rate;

[0029] Step S4: the odorant is sprayed out from the injection hole on the throttle body and enters the pipe body to mix with the natural gas. The display module displays the instantaneous odorant amount, the natural gas flow rate and the accumulated odorant amount.

[0030] In some possible implementations,

[0031] The natural gas flow rate is calculated in step S2, which specifically includes the following steps:

[0032] Step S21: Calculate the volume flow rate of natural gas passing through the inner cone odorizing device per unit time;

[0033]

[0034] Among them, q v is the volume flow rate of natural gas passing through the inner cone odorizing device per unit time;

[0035] C is the outflow coefficient;

[0036] ε is the expandability coefficient;

[0037] β is the diameter ratio; where β = d / D, d is the diameter of the large end of the throttle body under working conditions, and D is the inner diameter of the natural gas pipeline close to the small end of the throttle body under working conditions;

[0038] Δp is the differential pressure;

[0039] ρ1 is the fluid density of the natural gas in the natural gas pipeline near the small end of the throttle body;

[0040] Step S22: The amount of odorant pumped into the cavity by the delivery pump assembly is:

[0041] Q v =kq v ;

[0042] Where k is the proportionality coefficient;

[0043] Q v a quantity of odorant to be pumped into the cavity by the delivery pump assembly;

[0044] q v It is the volume flow rate of natural gas passing through the inner cone odorizing device per unit time.

[0045] Compared with the prior art, the present invention has the following beneficial effects:

[0046] The present invention connects the pipe body to the natural gas pipeline without drilling holes to install a matching flow meter, and can be matched with pipelines of any size. It has the advantages of strong practicality and applicability, simplifies the process flow, reduces the risk of environmental pollution, and effectively reduces the volume of the odorizing device.

[0047] The odorant in the present invention is injected into the pipe body through the injection hole and mixed with the natural gas, which can effectively overcome the problem of insufficient and uneven injection of the odorant.

[0048] The present invention utilizes the pressure difference between the front and rear ends of the throttle body to calculate the volume flow of natural gas passing through per unit time and to control the amount of odorant pumped into the hollow cavity inside the throttle body by the delivery pump assembly; the greater the volume flow of natural gas, the greater the amount of odorant pumped into the cavity of the throttle body by the delivery pump assembly; there is no need to connect a separate flow meter externally, thereby effectively reducing safety hazards and simplifying the odorization process. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a schematic diagram of the structure of the inner cone odorizing device in the present invention;

[0050] Figure 2 It is a structural schematic diagram of the throttle body in the present invention;

[0051] Figure 3 It is a schematic diagram of the structure of the throttling body, the liquid injection pipe, and the low-pressure pressure taking pipe in the present invention;

[0052] Figure 4 It is a schematic diagram of the internal connection of the throttling body, the cavity and the low-pressure taking pipe in the present invention;

[0053] Wherein: 1-flange, 2-high pressure taking pipe, 3-low pressure taking pipe, 4-differential pressure transmitter, 5-display module, 6-control unit, 7-power module, 8-pump body, 9-liquid inlet pipe, 10-drive module, 11-tube body, 12-liquid injection pipe, 13-liquid outlet pipe, 14-throttling body, 15-cavity. DETAILED DESCRIPTION

[0054] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral body; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. The "first", "second" and similar words mentioned in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, "one" or "one" and other similar words do not indicate a quantity restriction, but indicate the existence of at least one. In the implementation of this application, "and / or" describes the association relationship of the associated objects, indicating that there can be three relationships, for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In the description of the embodiments of the present application, unless otherwise specified, the meaning of "multiple" refers to two or more. For example, multiple positioning columns refer to two or more positioning columns. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] The present invention is described in detail below.

[0056] like Figure 1-Figure 4 As shown:

[0057] An inner cone odorizing device comprises a pipe body 11 connected to a natural gas main pipeline, a throttle body 14 located in the pipe body 11, a pressure detection assembly for detecting the pressure at both ends of the throttle body 14 along the axial direction of the pipe body 11, a delivery pump assembly connected to the throttle body 14 through a pipeline and located outside the pipe body 11, and a control assembly respectively connected to the pressure detection assembly and the delivery pump assembly;

[0058] A cavity 15 with a cone structure is arranged inside the throttling body 14 , and a liquid injection pipe 12 connected to the cavity 15 is arranged outside the cone structure; the delivery pump assembly is connected to the small end of the cavity 15 .

[0059] The two ends of the pipe body 11 are connected to the two sets of natural gas main pipelines through flanges 1, and the two sets of natural gas main pipelines include upstream pipelines and downstream pipelines. The small end of the cavity 15 is arranged on the side close to the upper oil pipeline, and the large end is arranged on the side away from the upper pipeline.

[0060] The cavity 15 with a cone structure forms a pressure difference in the pipe body 11, which enables the odorant pumped in by the delivery pump assembly to be uniformly sprayed into the pipe body 11, and then uniformly mixed with the natural gas in the pipe body 11, and the mixed gas enters the downstream pipeline.

[0061] In some possible implementations, in order to enable the odorant to be further evenly mixed with the natural gas in the pipe body 11;

[0062] The axis of the throttle body 14 is coaxially arranged with the axis of the tube body 11 ; the throttle body 14 is in a cone structure, and the large end of the throttle body 14 is arranged on the same side as the large end of the cavity 15 .

[0063] In some possible implementations, in order to effectively detect the pressure of the throttle body 14 at both ends of the axial direction of the tube body 11 and transmit the detection information to the control assembly;

[0064] The pressure detection component includes a differential pressure transmitter 4 connected to the control assembly, a high-pressure pressure-taking pipe 2 connected to the differential pressure transmitter 4 and located on the small end side of the throttle body 14, and a low-pressure pressure-taking pipe 3 connected to the differential pressure transmitter 4 and located on the small end side of the throttle body 14; the high-pressure pressure-taking pipe 2 and the low-pressure pressure-taking pipe 3 are located in the pipe body 11.

[0065] The high-pressure pressure-taking pipe 2 is provided with a throttle body 14 close to the upstream pipeline, and cooperates with the differential pressure transmitter 4 to realize the pressure test of the throttle body 14 in the pipe body 11 close to the upstream pipeline; the high-pressure pressure-taking port is provided on the pipe body 11 and communicates with the high-pressure pressure-taking pipe 2;

[0066] The low-pressure taking pipe 3 is arranged on the side of the throttle body 14 close to the downstream pipeline, and cooperates with the differential pressure transmitter 4 to realize the pressure test on the side of the throttle body 14 away from the upstream pipeline in the pipe body 11; the low-pressure taking port is arranged on the end surface of the throttle body 14 and communicates with the low-pressure taking pipe 3;

[0067] The pressure tested above is transmitted to the control assembly, which obtains the pressure difference information and calculates the natural gas flow rate based on the information;

[0068] In some possible implementations, in order to make the device highly integrated, installation is avoided;

[0069] The low-pressure pressure-taking pipe 3 includes a pressure-taking pipeline coaxially arranged with the throttle body 14 and penetrating the throttle body 14 , and a connecting pipe connected to one end of the pressure-taking pipeline close to the small end of the throttle body 14 , and the other end of the connecting pipe passes through the pipe body 11 and is connected to the differential pressure transmitter 4 .

[0070] The pressure-taking pipeline is arranged along the axial direction of the tube body 11, and one end of the pressure-taking pipeline passes through the large end of the throttle body 14; in this way, the throttle body 14 and the pressure-taking pipeline form a whole; the pressure-taking pipeline is connected to the connecting pipeline on the side close to the small end of the throttle body 14, and the other end of the connecting pipeline is connected to the differential pressure transmitter 4, thereby realizing the detection of the pressure at the large end of the throttle body 14 (the end of the throttle body 14 close to the downstream pipeline).

[0071] In some possible implementations,

[0072] The delivery pump assembly includes a liquid outlet pipe 13 whose one end is connected to the small end of the throttling body 14 , a pump body 8 connected to the other end of the liquid outlet pipe 13 , and a liquid infusion pipe connected to the pump body 8 .

[0073] In some possible implementations,

[0074] A check valve is provided on the liquid outlet pipe 13 to prevent the odorant from flowing in the reverse direction from the liquid outlet pipe 13 into the pump body 8 .

[0075] In some possible implementations,

[0076] The control assembly is installed on the outside of the tube body 11, and includes a control unit 6 connected to the pressure detection component, a drive module 10 connected to the control unit 6 and the infusion pump component respectively, and a display module 5 and a power module 7 connected to the control unit 6 respectively.

[0077] The control unit 6 realizes effective control of the infusion pump assembly through the driving module 10, so as to pump the odorant into the cavity 15;

[0078] The power module 7 is used for supplying power; the display module 5 is used for displaying the instantaneous odorizing amount, the gas flow rate and the accumulated odorizing amount.

[0079] In some possible implementations,

[0080] The injection tubes 12 are multiple groups and are arranged along the circumference of the throttle body 14 , and multiple groups of injection holes are arranged on each group of the injection tubes 12 .

[0081] The odorizing method of the inner cone odorizing device specifically comprises the following steps:

[0082] Step S1: Taking the concentration of the odorant in the natural gas main pipeline as the control target; when working, the delivery pump assembly performs pre-filling so that the odorant pre-fills the cavity 15 in the throttle body 14;

[0083] Step S2: The pressure detection component detects the pressure at the front and rear ends of the throttle body 14 along the axial direction of the tube body, and transmits the detection data to the control assembly, which calculates the natural gas flow rate based on the pressure difference information;

[0084] That is, natural gas enters the pipe body 11 from the upstream pipeline and flows through the device; the high-pressure pressure-taking pipe 2 and the low-pressure pressure-taking pipe 3 transmit the pressure of the throttle body 14 along the axial front and rear ends of the pipe body 11 to the differential pressure transmitter 4, and the differential pressure transmitter 4 transmits the pressure difference information to the control unit 6, and the control unit 6 calculates the natural gas flow rate according to the pressure difference information;

[0085] The natural gas flow rate is calculated in step S2, which specifically includes the following steps:

[0086] Step S21: Calculate the volume flow rate of natural gas passing through the inner cone odorizing device per unit time;

[0087]

[0088] Among them, q v is the volume flow rate of natural gas passing through the inner cone odorizing device per unit time;

[0089] C is the outflow coefficient;

[0090] ε is the expandability coefficient;

[0091] β is the diameter ratio; wherein β=d / D, d is the diameter of the large end of the throttle body 14 under working conditions, and D is the inner diameter of the natural gas pipeline close to the small end of the throttle body 14 under working conditions;

[0092] Δp is the differential pressure;

[0093] ρ1 is the fluid density of the natural gas in the natural gas pipeline near the small end of the throttle body;

[0094] Step S22: The amount of odorant pumped into the cavity 15 by the delivery pump assembly is:

[0095] Q v =kq v ;

[0096] Where k is the proportionality coefficient;

[0097] Q v a quantity of odorant to be pumped into the cavity by the delivery pump assembly;

[0098] q v It is the volume flow rate of natural gas passing through the inner cone odorizing device per unit time.

[0099] Step S3: the control unit 6 controls the pump body 8 to add an amount of odorant into the cavity 15 through the driving module 10 according to the natural gas flow rate; wherein the amount of odorant pumped into the cavity 15 by the pump body 8 is proportional to the natural gas flow rate, and the greater the natural gas volume flow rate, the greater the amount of odorant pumped into the cavity 15 by the pump body 8;

[0100] Step S4: the odorant is sprayed out from the injection hole on the throttle body 14 and enters the pipe body 11 to mix with the natural gas. The natural gas evenly mixed with the odorant is returned from the pipe body 11 to the natural gas pipeline at the downstream end; the display module 5 displays the instantaneous odorizing amount, natural gas flow rate and cumulative odorizing amount.

[0101] The present invention utilizes the pressure difference between the front and rear ends of the throttling body 14 to calculate the volume flow rate of natural gas passing through the device per unit time and to control the amount of odorant pumped into the cavity 15 by the pump body 8. The greater the volume flow rate of natural gas, the greater the amount of odorant pumped into the hollow cavity 15 inside the throttling body 14 by the micro pump. The entire process does not require an external separate flow meter, which effectively reduces safety hazards and simplifies the odorization process.

[0102] The present invention is not limited to the above-mentioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. An inner cone odorizing device, characterized in that: It includes a pipe body connected to the natural gas main pipeline, a throttle body located in the pipe body, a pressure detection assembly for detecting the pressure at both ends of the throttle body along the axial direction of the pipe body, a delivery pump assembly connected to the throttle body through a pipeline and located outside the pipe body, and a control assembly respectively connected to the pressure detection assembly and the delivery pump assembly; A cavity in a cone structure is arranged inside the throttling body; the delivery pump assembly is connected with the small end of the cavity; and an injection pipe connected with the cavity is arranged outside the cone structure.

2. An inner cone odorizing device according to claim 1, characterized in that: The axis of the throttle body is coaxially arranged with the axis of the tube body; the throttle body is in a cone structure, and the large end of the throttle body is arranged on the same side as the large end of the cavity.

3. An inner cone odorizing device according to claim 2, characterized in that: The pressure detection component includes a differential pressure transmitter connected to the control assembly, a high-pressure pressure-taking pipe connected to the differential pressure transmitter and located on the small end side of the throttle body, and a low-pressure pressure-taking pipe connected to the differential pressure transmitter and located on the small end side of the throttle body; the high-pressure pressure-taking pipe and the low-pressure pressure-taking pipe are located in the pipe body.

4. An inner cone odorizing device according to claim 3, characterized in that: The low-pressure pressure-taking pipe comprises a pressure-taking pipeline coaxially arranged with the throttle body and penetrating the throttle body, a connecting pipe connected to one end of the pressure-taking pipeline close to the small end of the throttle body, and the other end of the connecting pipe passes through the pipe body and is connected to the differential pressure transmitter.

5. An inner cone odorizing device according to claim 2, characterized in that: The delivery pump assembly comprises a liquid outlet pipe whose one end is connected to one side of the small end of the throttling body, a pump body connected to the other end of the liquid outlet pipe, and a liquid delivery pipe connected to the pump body.

6. An inner cone odorizing device according to claim 5, characterized in that: A check valve is arranged on the liquid outlet pipe.

7. An inner cone odorizing device according to any one of claims 1 to 6, characterized in that: The control assembly is installed on the outside of the tube body, and includes a control unit connected to the pressure detection component, a drive module connected to the control unit and the infusion pump component respectively, and a display module and a power supply module connected to the control unit respectively.

8. An inner cone odorizing device according to any one of claims 2 to 6, characterized in that: The injection tubes are multiple groups and are arranged along the circumference of the throttle body, and multiple groups of injection holes are arranged on each group of the injection tubes.

9. An odorizing method for the inner cone odorizing device according to any one of claims 1 to 8, characterized in that: The specific steps include: Step S1: The delivery pump assembly is pre-filled so that the odorant pre-fills the cavity in the throttle body; Step S2: The pressure detection component detects the pressure at the front and rear ends of the throttle body along the axial direction of the tube body, and transmits the detection data to the control assembly, which calculates the natural gas flow rate based on the pressure difference information; Step S3: the control assembly controls the amount of odorant added to the cavity according to the natural gas flow rate; Step S4: the odorant is sprayed out from the injection hole on the throttle body and enters the pipe body to mix with the natural gas. The display module displays the instantaneous odorant amount, the natural gas flow rate and the accumulated odorant amount.

10. The odorizing method according to claim 9, characterized in that , the natural gas flow rate is calculated in step S2, specifically including the following steps: Step S21: Calculate the volume flow rate of natural gas passing through the inner cone odorizing device per unit time; Among them, q v is the volume flow rate of natural gas passing through the inner cone odorizing device per unit time; C is the outflow coefficient; ε is the expandability coefficient; β is the diameter ratio; where β = d / D, d is the diameter of the large end of the throttle body under working conditions, and D is the inner diameter of the natural gas pipeline close to the small end of the throttle body under working conditions; Δp is the differential pressure; ρ1 is the fluid density of the natural gas in the natural gas pipeline near the small end of the throttle body; Step S22: The amount of odorant pumped into the cavity by the delivery pump assembly is: Q υ =kq υ ; Where k is the proportionality coefficient; Q v a quantity of odorant to be pumped into the cavity by the delivery pump assembly; q v It is the volume flow rate of natural gas passing through the inner cone odorizing device per unit time.

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