Device for purifying LNG (liquefied natural gas) and CO (carbon monoxide) from methanol tail gas by cryogenic method

Abstract

The device comprises a methanol tail gas pipeline, a nitrogen circulating pipeline, a main heat exchanger, an LNG rectifying tower, a CO rectifying tower, a gas-liquid separation module, an H2-rich waste gas pipeline, a CO-rich waste gas outlet pipeline, an LNG product pipeline and a CO product pipeline, the methanol tail gas pipeline passes through a heat release pipeline of the main heat exchanger and then is connected with the gas-liquid separation module; the gas-liquid separation module is respectively connected with the LNG rectifying tower, the H2-rich waste gas pipeline and the CO-rich waste gas outlet pipeline; the LNG rectifying tower is respectively connected with the nitrogen circulating pipeline, the CO-rich waste gas outlet pipeline and the LNG product pipeline; the CO rectifying tower is respectively connected with the nitrogen circulating pipeline and the CO product pipeline; and the LNG rectifying tower and the CO rectifying tower are connected through a gas pipeline and a return pipeline. The utility model aims to solve the technical problems in the prior art, and provides a device and a method for purifying LNG (Liquefied Natural Gas) and CO (Carbon Oxide) from methanol tail gas by a cryogenic method, which can realize the purification and recovery of LNG and CO.

Description

Technical Field

[0001] The utility model relates to the technical field of gas purification, in particular to a device for purifying LNG and CO by using a deep cooling method for methanol tail gas. Background Art

[0002] The main components of the methanol synthesis cycle tail gas after rough purification are methane, hydrogen, carbon monoxide, carbon dioxide, nitrogen and argon, etc. The existing treatment is generally to send it to a flare for combustion or use it as fuel, which wastes resources and pollutes the environment. Utility Model Content

[0003] 1. Technical problems to be solved by the utility model

[0004] The utility model aims to solve the technical problems existing in the prior art and provides a device for purifying LNG and CO by using a methanol tail gas cryogenic method, which can realize the purification and recovery of liquefied natural gas LNG and CO.

[0005] 2. Technical solution

[0006] In order to solve the above problems, the technical solution provided by the utility model is:

[0007] A device for purifying LNG and CO by using a methanol tail gas cryogenic method comprises a methanol tail gas pipeline, a nitrogen circulation pipeline, a main heat exchanger, an LNG distillation tower, a CO distillation tower, a gas-liquid separation module, an H2-rich waste gas pipeline, a CO-rich waste gas outlet pipeline, an LNG product pipeline, and a CO product pipeline; the methanol tail gas pipeline is connected to the gas-liquid separation module after passing through the heat release pipeline of the main heat exchanger, and the gas-liquid separation module is respectively connected to the LNG distillation tower, the H2-rich waste gas pipeline and the CO-rich waste gas outlet pipeline; the LNG distillation tower is respectively connected to the nitrogen circulation pipeline, the CO-rich waste gas outlet pipeline and the LNG product pipeline; the CO distillation tower is respectively connected to the nitrogen circulation pipeline and the CO product pipeline; the LNG distillation tower and the CO distillation tower are connected via a gas pipeline and a reflux pipeline.

[0008] Optionally, a tail gas purification and compression module is provided on the methanol tail gas pipeline, and the tail gas purification and compression module includes a decarbonization tower, a tail gas compressor, a tail gas compressor final stage cooler, a first gas-liquid separation tank and a molecular sieve arranged on the methanol tail gas pipeline.

[0009] Optionally, the LNG distillation tower is provided with a first distillation tower evaporator, and the methanol tail gas pipeline passes through the heat release pipeline of the main heat exchanger and the first distillation tower evaporator, and then passes through the heat release pipeline of the main heat exchanger again before connecting to the gas-liquid separation module.

[0010] Optionally, a nitrogen circulation refrigeration module is provided on the nitrogen circulation pipeline, and the nitrogen circulation refrigeration module includes an LNG distillation tower condenser, a CO distillation tower condenser, a circulating nitrogen compressor, a circulating nitrogen compressor final stage cooler and a second distillation tower evaporator arranged on the nitrogen circulation pipeline, the LNG distillation tower condenser and the second distillation tower evaporator are arranged in the LNG distillation tower, and the CO distillation tower condenser is arranged in the CO distillation tower.

[0011] Optionally, the nitrogen circulation refrigeration module also includes a refrigeration pipeline, which is connected to the nitrogen circulation pipeline and is provided with a first circulation nitrogen expander, a second circulation nitrogen expander boosting end, a second circulation nitrogen expander boosting end final stage cooler and a second circulation nitrogen expander.

[0012] Optionally, the nitrogen circulation refrigeration module further includes a nitrogen replenishment pipeline and / or a liquid nitrogen replenishment pipeline, and the nitrogen replenishment pipeline and the liquid nitrogen replenishment pipeline are both connected to the nitrogen circulation pipeline.

[0013] Optionally, the LNG product pipeline passes through a heat release pipeline of the main heat exchanger.

[0014] Optionally, a cold box is further included, and the main heat exchanger, the LNG distillation tower, the CO distillation tower and the gas-liquid separation module are all arranged in the cold box.

[0015] 3. Beneficial effects

[0016] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0017] The device for purifying LNG and CO from methanol tail gas by cryogenic method can purify methanol synthesis tail gas, adopts low-temperature distillation to separate and purify CH4 and CO, and adopts structured packing tower technology representing the most advanced level of air separation technology today, with the characteristics of high extraction rate, low overall energy consumption, safe and reliable operation, etc.; nitrogen is used as the refrigeration medium for recycling, and the process organization is simple; the device for purifying LNG and CO from methanol tail gas by cryogenic method has advanced process, mature technology, safety and reliability, convenient operation, economical and reasonable equipment configuration, high CH4 and CO extraction rate, high calorific value of purified liquefied natural gas LNG, CO purity can reach 99.99% and above, and the effective components of methanol tail gas are effectively recovered, while reducing environmental pollution caused by combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of a device for purifying LNG and CO by using a methanol tail gas cryogenic method according to an embodiment of the utility model;

[0019] 1. Methanol tail gas pipeline; 2. Decarbonization tower; 3. Tail gas compressor; 4. Tail gas compressor final cooler; 5. First gas-liquid separation tank; 6. Molecular sieve; 7. Main heat exchanger; 8a. First distillation tower evaporator; 8b. Second distillation tower evaporator; 9. LNG distillation tower; 9b. Side line production outlet; 9c. Reflux outlet; 9e. LNG distillation tower nitrogen circulation outlet; 9f. LNG distillation tower nitrogen circulation inlet; 10. Second gas-liquid separation tank; 11. H2-rich waste gas pipeline; 12. Third gas-liquid separation tank; 13. LNG distillation tower condenser; 14. CO-rich waste gas pipeline; 15. LNG product pipeline; 16. CO distillation tower; 16a. Reflux outlet; 1 6b, side line inlet; 16c, CO distillation tower nitrogen circulation inlet; 16d, CO distillation tower nitrogen circulation outlet; 17, CO distillation tower condenser; 18, CO product pipeline; 19, nitrogen circulation pipeline outlet; 20, nitrogen replenishment pipeline; 21, circulating nitrogen compressor; 22, circulating nitrogen compressor final stage cooler; 23, first circulating nitrogen expander boosting end; 24, first circulating nitrogen expander boosting end final stage cooler; 25, nitrogen expansion refrigeration pipeline; 26, first circulating nitrogen expander; 27, second circulating nitrogen expander boosting end; 28, second circulating nitrogen expander boosting end final stage cooler; 29, second circulating nitrogen expander; 30, cold box; 31, liquid nitrogen replenishment pipeline. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described here are only used to explain the utility model and do not limit the protection scope of the utility model.

[0021] It should be noted that when an element is referred to as being "fixed to", "disposed on", "fixed on" or "installed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. Further, when an element is considered to be "fixedly connected to" another element, the two may be fixed in a detachable connection manner or in a non-detachable connection manner, such as socketing, snap-on, one-piece fixation, welding, etc., which can be achieved in the prior art and will not be repeated here. When an element is perpendicular or approximately perpendicular to another element, it means that the ideal state of the two is vertical, but due to the influence of manufacturing and assembly, there may be a certain vertical error. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0023] The “first” and “second” involved in the present invention do not represent specific quantities and orders, but are merely used to distinguish names.

[0024] Combined with Figure 1 The present embodiment is a methanol tail gas cryogenic purification LNG and CO device, comprising a methanol tail gas pipeline 1, a nitrogen circulation pipeline 19, a main heat exchanger 7, an LNG distillation tower 9, a CO distillation tower 16, a gas-liquid separation module, an H2-rich waste gas pipeline 11, a CO-rich waste gas outlet pipeline 14, an LNG product pipeline 15, and a CO product pipeline 18. One end of the methanol tail gas pipeline 1 is used to collect the roughly purified methanol synthesis tail gas. The methanol tail gas pipeline 1 is provided with a tail gas purification and compression module for the methanol synthesis The tail gas is further purified; the methanol tail gas pipeline 1 is connected to the gas-liquid separation module after passing through the heat release pipeline of the main heat exchanger 7, and the gas-liquid separation module is respectively connected to the LNG distillation tower 9, the H2-rich exhaust gas pipeline 11 and the CO-rich exhaust gas outlet pipeline 14; the LNG distillation tower 9 is respectively connected to the nitrogen circulation pipeline 19, the CO-rich exhaust gas outlet pipeline 14 and the LNG product pipeline 15, and the LNG product pipeline 15 is connected to the bottom of the LNG distillation tower 9 and The heat release pipeline of the main heat exchanger 7 passes through the upper end of the LNG distillation tower 9, and the LNG distillation tower nitrogen circulation outlet 9e and the LNG distillation tower nitrogen circulation inlet 9f connected to the nitrogen circulation pipeline 19 are provided; the CO distillation tower 16 is connected to the nitrogen circulation pipeline 19 and the CO product pipeline 18 respectively, and the CO product pipeline 18 is connected to the top of the CO distillation tower 16, and the upper end of the CO distillation tower 16 is provided with a CO distillation tower nitrogen circulation outlet 16d and a C O distillation tower nitrogen circulation inlet 16c; the LNG distillation tower 9 and the CO distillation tower 16 are connected by a gas pipeline and a reflux pipeline, the LNG distillation tower 9 is provided with a side line production port 9b and a reflux port 9c in the middle, the CO distillation tower 16 is provided with a side line inlet 16b in the middle, and the CO distillation tower 16 is provided with a reflux outlet 16a at the bottom, the gas pipeline connects the side line production port 9b and the side line inlet 16b, and the reflux pipeline connects the reflux outlet 16a and the reflux port 9c.

[0025] The methanol tail gas in the methanol tail gas cryogenic method for purifying LNG and CO device passes through the gas-liquid separation module and then enters the LNG distillation tower 9 for distillation and purification. In the LNG distillation tower 9, the ascending gas is fully in contact with the downstream liquid, and after mass and heat transfer, liquefied natural gas LNG is obtained; the gas extracted from the side line of the LNG distillation tower 9 enters the CO distillation tower 16 for distillation and purification, and a high-purity CO product is obtained at the top of the CO distillation tower 16.

[0026] The device for purifying LNG and CO from methanol tail gas by cryogenic method can purify LNG and CO from methanol synthesis tail gas, adopts low-temperature distillation to separate and purify methanol tail gas, and adopts structured packing tower technology representing the most advanced level of air separation technology today, with the characteristics of high CH4 and CO extraction rate, low overall energy consumption, safe and reliable operation, etc.; nitrogen is used as the refrigeration medium for recycling, and the process organization is simple; the device for purifying LNG and CO from methanol tail gas by cryogenic method has advanced process, mature technology, safety and reliability, convenient operation, and economical and reasonable equipment configuration. The purity of the purified pure CO can reach 99.99% or above, effectively recovering the effective components of methanol tail gas, while reducing environmental pollution caused by combustion.

[0027] As an optional solution of the present invention, the gas-liquid separation module includes a second gas-liquid separation tank 10 and a third gas-liquid separation tank 12 which are sequentially arranged on the methanol tail gas pipeline 1, the second gas-liquid separation tank 10 is connected to the H2-rich waste gas pipeline 11, and the third gas-liquid separation tank 12 is connected to the CO-rich waste gas outlet pipeline 14.

[0028] As an optional scheme of the present utility model, the exhaust gas purification and compression module includes a decarbonization tower 2, an exhaust gas compressor 3, an exhaust gas compressor final stage cooler 4, a first gas-liquid separation tank 5 and a molecular sieve 6 arranged on the methanol exhaust gas pipeline 1. The methanol synthesis exhaust gas passes through the decarbonization tower 2, the exhaust gas compressor 3, the first gas-liquid separation tank 5 and the molecular sieve 6 in sequence to achieve purification and compression.

[0029] As an optional solution of the present invention, the LNG distillation tower 9 is provided with a first distillation tower evaporator 8a. After the methanol tail gas pipeline 1 passes through the heat release pipeline of the main heat exchanger 7 and the first distillation tower evaporator 8a, it passes through the heat release pipeline of the main heat exchanger 7 again and is connected to the gas-liquid separation module. The first distillation tower evaporator 8a is installed at the bottom of the LNG distillation tower 9. The first distillation tower evaporator 8a and the LNG distillation tower 9 are an integrated structure. When the methanol tail gas passes through the first distillation tower evaporator 8a, heat is released, and the gas in the LNG distillation tower 9 is prompted to flow from bottom to top as power.

[0030] As an optional solution of the present utility model, a nitrogen circulation refrigeration module is provided on the nitrogen circulation pipeline 19, and the nitrogen circulation refrigeration module includes an LNG distillation tower condenser 13, a CO distillation tower condenser 17, a circulating nitrogen compressor 21, a circulating nitrogen compressor final cooler 22 and a second distillation tower evaporator 8b arranged on the nitrogen circulation pipeline 19, the LNG distillation tower condenser 13 and the second distillation tower evaporator 8b are arranged in the LNG distillation tower 9, the LNG distillation tower condenser 13 is installed at the top of the LNG distillation tower 9, the second distillation tower evaporator 8b is installed at the bottom of the LNG distillation tower 9, and is an integrated structure with the LNG distillation tower 9, and the circulating nitrogen is released when passing through the second distillation tower evaporator 8b. Heat is released, and the gas in the LNG distillation tower 9 is caused to flow from bottom to top. As a driving force, the CO distillation tower condenser 17 is arranged in the CO distillation tower 16 and installed on the top of the CO distillation tower 16. The nitrogen circulation pipeline 19 passes through the LNG distillation tower condenser 13 and the heat absorption pipeline of the CO distillation tower condenser 17, the heat absorption pipeline of the main heat exchanger 7, the circulating nitrogen compressor 21, the circulating nitrogen compressor final stage cooler 22, the heat release pipeline of the main heat exchanger 7, the second distillation tower evaporator 8b and the heat release pipeline of the main heat exchanger 7, and is respectively connected to the LNG distillation tower nitrogen circulation inlet 9f of the LNG distillation tower 9 and the CO distillation tower nitrogen circulation inlet 16c of the CO distillation tower 16.

[0031] In the main heat exchanger 7, the methanol tail gas is further cooled, and after passing through the second gas-liquid separation tank 10 and the third gas-liquid separation tank 12, it enters the middle part of the LNG distillation tower 9 to participate in distillation; the circulating nitrogen is further cooled and throttled through the main heat exchanger 7, and enters the LNG distillation tower condenser 13 and the CO distillation tower condenser 17, and is discharged from the circulating nitrogen outlets 9e and 16d of the distillation tower, and passes through the heat absorption pipeline of the main heat exchanger 7 in turn to absorb heat and heat up, and then is cooled and cooled through the circulating nitrogen compressor 21 and the circulating nitrogen compressor final stage cooler 22. The cooled and cooled circulating nitrogen enters the heat release pipeline of the main heat exchanger 7 to further release heat and cool down, and then enters the second distillation tower evaporator 8b.

[0032] As an optional solution of the present invention, the nitrogen cycle refrigeration module further includes a refrigeration pipeline 25, the refrigeration pipeline 25 is connected to the nitrogen cycle pipeline 19, and the refrigeration pipeline 25 is provided with a first cycle nitrogen expander 26, a second cycle nitrogen expander boosting end 27, a second cycle nitrogen expander boosting end final cooler 28 and a second cycle nitrogen expander 29, the nitrogen inlet end of the refrigeration pipeline 25 is connected to the nitrogen outlet of the second distillation tower evaporator 8b, and the nitrogen outlet end of the refrigeration pipeline 25 is connected to the LNG distillation tower condenser 13 and the CO rectifier The refrigeration pipeline 25 is connected to the nitrogen inlet of the second distillation tower condenser 17, the refrigeration pipeline 25 is connected to the first circulating nitrogen expander 26 from the nitrogen outlet of the second distillation tower evaporator 8b, and then connected to the second circulating nitrogen expander boosting end 27 and the second circulating nitrogen expander boosting end final cooler 28 through the heat absorption pipeline of the main heat exchanger 7, and then connected to the second circulating nitrogen expander 29 through the pipeline of the main heat exchanger 7, and the second circulating nitrogen expander 29 is connected to the nitrogen inlet of the LNG distillation tower condenser 13 and the CO distillation tower condenser 17.

[0033] As an optional solution of the present invention, the nitrogen circulation refrigeration module further includes a nitrogen replenishment pipeline 20 and / or a liquid nitrogen replenishment pipeline 31. The nitrogen replenishment pipeline 20 and the liquid nitrogen replenishment pipeline 31 are both connected to the nitrogen circulation pipeline 19. The liquid nitrogen replenishment pipeline 31 is used to inject liquid nitrogen into the LNG distillation tower condenser 13 and the CO distillation tower condenser 17 as a cold source. In practical applications, the first circulation nitrogen expander 26, the second circulation nitrogen expander 29 and the liquid nitrogen replenishment pipeline 31 are two mutually replaceable solutions. When the refrigeration capacity is obviously insufficient, a combination of the two can be adopted. The nitrogen replenishment pipeline 20 replenishes the nitrogen lost in the circulation process in practical applications.

[0034] As an optional solution of the present invention, the LNG product pipeline 15 passes through the heat release pipeline of the main heat exchanger 7 so that the LNG product is further cooled before being discharged.

[0035] As an optional solution of the present invention, the heat exchangers of the main heat exchanger 7, the LNG distillation tower condenser 13, the first distillation tower evaporator 8a, the second distillation tower evaporator 8b, and the CO distillation tower 16 are all vacuum brazed plate-fin heat exchangers to ensure the heat exchange effect and efficiency.

[0036] As an optional solution of the utility model, a cold box 30 is also included. The main heat exchanger 7, the LNG distillation tower 9, the CO distillation tower 16 and the gas-liquid separation module are all arranged in the cold box 30. The cold box is a group of high-efficiency, heat-insulating and cold-preserving low-temperature heat exchange equipment. It is often used in the deep cold separation process. It consists of a compact and efficient plate heat exchanger and a gas-liquid separation tank. Because low temperature is very easy to dissipate cold, extremely strict heat insulation and cold preservation are required. Therefore, the heat exchanger and separator are packed in a box-shaped object with insulating materials, which is called a cold box.

[0037] The purification method of the methanol tail gas cryogenic method for purifying LNG and CO device is to prepare liquefied natural gas LNG and high-purity CO by purifying, compressing and cryogenically distilling the atmospheric pressure roughly purified methanol tail gas, the waste gas generated in the cryogenic distillation step is used as molecular sieve regeneration gas and fuel gas, and nitrogen is used as a refrigeration medium in the cryogenic distillation step for recycling.

[0038] The cryogenic purification method of methanol tail gas is used to purify CH4 and CO from methanol production circulating tail gas. The cryogenic distillation method is used to separate and purify CH4 and CO from methanol tail gas, and the structured packing tower technology representing the most advanced level of air separation technology is used. It has the characteristics of high product extraction rate, low overall energy consumption, safe and reliable operation, etc.; nitrogen is used as the refrigeration medium for recycling, and the process organization is simple; the purity of the obtained CO can reach 99.99% or above, effectively recovering the effective components of methanol tail gas, while reducing environmental pollution caused by combustion.

[0039] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A device for purifying LNG and CO by cryogenic method of methanol tail gas, characterized by: Including methanol tail gas pipeline, nitrogen circulation pipeline, main heat exchanger, LNG distillation tower, CO distillation tower, gas-liquid separation module, H2-rich waste gas pipeline, CO-rich waste gas outlet pipeline, LNG product pipeline, CO product pipeline; The methanol tail gas pipeline is connected to the gas-liquid separation module after passing through the heat release pipeline of the main heat exchanger, and the gas-liquid separation module is respectively connected to the LNG distillation tower, the H2-rich waste gas pipeline and the CO-rich waste gas outlet pipeline; The LNG distillation tower is respectively connected to the nitrogen circulation pipeline, the CO-rich waste gas outlet pipeline and the LNG product pipeline; The CO distillation tower is connected to the nitrogen circulation pipeline and the CO product pipeline respectively; The LNG distillation tower and the CO distillation tower are connected via a gas pipeline and a reflux pipeline.

2. The device for purifying LNG and CO by cryogenic method of methanol tail gas according to claim 1, characterized in that: The methanol tail gas pipeline is provided with a tail gas purification and compression module, and the tail gas purification and compression module comprises a decarbonization tower, a tail gas compressor, a tail gas compressor final stage cooler, a first gas-liquid separation tank and a molecular sieve arranged on the methanol tail gas pipeline.

3. The device for purifying LNG and CO by cryogenic method of methanol tail gas according to claim 1, characterized in that: The LNG distillation tower is provided with a first distillation tower evaporator. The methanol tail gas pipeline passes through the heat release pipeline of the main heat exchanger and the first distillation tower evaporator, and then passes through the heat release pipeline of the main heat exchanger again before connecting to the gas-liquid separation module.

4. The device for purifying LNG and CO by cryogenic method of methanol tail gas according to claim 1, characterized in that: A nitrogen circulation refrigeration module is provided on the nitrogen circulation pipeline, and the nitrogen circulation refrigeration module comprises an LNG distillation tower condenser, a CO distillation tower condenser, a circulating nitrogen compressor, a circulating nitrogen compressor final stage cooler and a second distillation tower evaporator which are arranged on the nitrogen circulation pipeline. The LNG distillation tower condenser and the second distillation tower evaporator are arranged in the LNG distillation tower, and the CO distillation tower condenser is arranged in the CO distillation tower.

5. The device for purifying LNG and CO by cryogenic method of methanol tail gas according to claim 4, characterized in that: The nitrogen circulation refrigeration module further comprises a refrigeration pipeline, which is connected to the nitrogen circulation pipeline and is provided with a first circulation nitrogen expander, a second circulation nitrogen expander boosting end, a second circulation nitrogen expander boosting end final cooler and a second circulation nitrogen expander.

6. The device for purifying LNG and CO by cryogenic method of methanol tail gas according to claim 4, characterized in that: The nitrogen circulation refrigeration module further includes a nitrogen replenishment pipeline and / or a liquid nitrogen replenishment pipeline, and the nitrogen replenishment pipeline and the liquid nitrogen replenishment pipeline are both connected to the nitrogen circulation pipeline.

7. The device for purifying LNG and CO by cryogenic method of methanol tail gas according to claim 1, characterized in that: The LNG product pipeline passes through the heat release pipeline of the main heat exchanger.

8. A device for purifying LNG and CO from methanol tail gas by cryogenic method according to any one of claims 1 to 7, characterized in that: It also includes a cold box, in which the main heat exchanger, the LNG distillation tower, the CO distillation tower and the gas-liquid separation module are all arranged.

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