CN203517830U - Energy-saving desorption system with controllable temperature - Google Patents
Energy-saving desorption system with controllable temperature Download PDFInfo
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- CN203517830U CN203517830U CN201320606978.3U CN201320606978U CN203517830U CN 203517830 U CN203517830 U CN 203517830U CN 201320606978 U CN201320606978 U CN 201320606978U CN 203517830 U CN203517830 U CN 203517830U
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Abstract
The utility model relates to an energy-saving desorption system with the controllable temperature. The energy-saving desorption system with the controllable temperature comprises an inlet gas heater, a catalysis bed, a catalysis fan and a heat exchanger, wherein a catalysis tail gas inlet, a catalysis tail gas outlet, a catalysis gas inlet, a catalysis gas outlet, a desorption gas conveying inlet and a desorption gas conveying outlet are formed in the heat exchanger, the catalysis fan is connected with the catalysis gas inlet through a pipeline, the catalysis gas outlet is connected with one end of the inlet gas heater through a pipeline, the catalysis bed comprises a gas inlet cover, a furnace body and a gas outlet cover, the gas inlet cover is fixedly installed at the upper end of the furnace body, and the gas outlet cover is fixedly installed at the lower end of the furnace body. According to the energy-saving desorption system with the controllable temperature, heat efficiency of treatment is effectively improved, heat loss is reduced, the heat recycling rate is increased, the temperature of a catalytic combustion bed in the energy-saving desorption system is even in the process of combustion, combustion efficiency is improved, the purifying rate is increased, heat exchange is improved, heat energy is used more reasonably, the requirements for energy saving and emission reduction are met, and the temperature of gas conveyed into the catalysis bed can be effectively controlled.
Description
Technical field
The utility model belongs to desorption system field, the energy-saving desorption system that especially a kind of temperature is controlled.
Background technology
In the desorption system that processing industrial volatile organic pollutants is used at present, capital equipment comprises catalytic bed, catalytic bed is made building enclosure by heat resisting steel sheet material or industrial furnace building material conventionally, in its existing catalytic combustion bed structure, air inlet and air outlet are located at the two ends up and down of catalytic combustion bed, although existing structure can be realized catalytic combustion, but there are the following problems: 1, the thermal losses of catalytic combustion pool furnace body structure own is large, and recuperation of heat utilization ratio is lower; 2, non-uniform temperature in catalytic combustion pool furnace body structure, is totally centre temperature high, and edge temperature is low, reduced industrial volatile organic pollutants efficiency of combustion, affect the purifying rate of catalytic combustion, 3, energy-saving effect is poor, do not meet energy-saving and emission-reduction requirement.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, provide a kind of temperature controlled energy-saving desorption system, this desorption system has effectively improved the thermal efficiency of processing, reduce thermal losses, improve recuperation of heat utilization rate, in catalytic combustion bed during burning in desorption system, temperature is more even, efficiency of combustion and purifying rate have been improved, increased heat exchange and more rationally utilized heat energy, met energy-saving and emission-reduction requirement, the gas temperature of input catalytic bed can effectively be controlled.
The utility model solves its technical problem and is achieved through the following technical solutions:
The energy-saving desorption system that a kind of temperature is controlled, it comprises air intake heater, catalytic bed, catalysis blower fan and heat exchanger, heat exchanger is provided with catalysis gas inlet, the outlet of catalysis tail gas, the import of catalysis gas, the outlet of catalysis gas, desorption entrance and the desorption outlet of supplying gas of supplying gas, catalysis blower and pipeline connects the import of catalysis gas, the outlet of catalysis gas connects air intake heater one end by pipeline, wherein catalytic bed comprises airscoop shroud, body of heater, air leaving cover, body of heater upper end is fixedly mounted with airscoop shroud, body of heater lower end is fixedly mounted with air leaving cover, body of heater comprise body of heater peripheral board with and the bottom plate that is fixedly mounted with of the upper head plate that is fixedly mounted with of upper end and its lower end, at body of heater peripheral board outer wall, be evenly fixed with heat-insulation layer, coaming plate in one body of heater is set in body of heater peripheral board, in body of heater, between coaming plate and body of heater peripheral board, be arranged alternately air intake duct and gas off-take, the import of air intake duct is arranged on upper head plate, the outlet of air intake duct is arranged between bottom plate and the interior coaming plate of body of heater, the import of gas off-take is arranged between upper head plate and the interior coaming plate of body of heater, the outlet of gas off-take is arranged on bottom plate, on the upper head plate middle part of corresponding airscoop shroud import, be provided with air inlet kuppe, on below upper head plate middle part, be provided with combustion gas kuppe, in body of heater corresponding to air intake port, be provided with catalytic bed heater, below the bottom plate middle part of corresponding air leaving cover outlet, be provided with the kuppe of giving vent to anger, the air intake heater other end connects airscoop shroud by pipeline, air leaving cover connects catalysis gas inlet by pipeline.
And described heat exchanger is plate type heat exchanger.
And described air intake duct is identical with the quantity of gas off-take and be evenly alternately arranged in body of heater between coaming plate and body of heater peripheral board.
And, on described airscoop shroud, be provided with explosion-proof relief mouth.
And described air inlet kuppe is positive rectangular pyramid structure, combustion gas kuppe and the kuppe of giving vent to anger are inverted positive rectangular pyramid structure.
And, in the body of heater above described heater, be provided with catalyst bracket, catalyst layer is installed on catalyst bracket.
And, described air intake duct adopt rectangular steel pipe and be arranged on body of heater peripheral board with the interior coaming plate of body of heater between, gas off-take is surrounded by coaming plate in air intake duct rectangle steel tube wall, body of heater peripheral board and the body of heater of its both sides.
And described body of heater peripheral board cross section is rectangle or square or circular, in body of heater, coaming plate cross section is rectangle or square or circular.
And described catalytic bed heater is electric heating tube group.
And described air intake duct cross section is rectangle or square or fan-shaped or circular or encircle fan-shapedly, gas off-take cross section is rectangle or square or fan-shaped or circular or encircle fan-shaped.
Advantage of the present utility model and beneficial effect are:
1, in the controlled energy-saving desorption system of this temperature, catalytic bed comprises airscoop shroud, body of heater, air leaving cover, body of heater upper end is fixedly mounted with airscoop shroud, body of heater lower end is fixedly mounted with air leaving cover, body of heater comprise body of heater peripheral board with and the bottom plate that is fixedly mounted with of the upper head plate that is fixedly mounted with of upper end and its lower end, at body of heater peripheral board outer wall, be evenly fixed with heat-insulation layer, coaming plate in one body of heater is set in body of heater peripheral board, in body of heater, between coaming plate and body of heater peripheral board, be arranged alternately air intake duct and gas off-take, the import of air intake duct is arranged on upper head plate, the outlet of air intake duct is arranged between bottom plate and the interior coaming plate of body of heater, the import of gas off-take is arranged between upper head plate and the interior coaming plate of body of heater, the outlet of gas off-take is arranged on bottom plate, on the upper head plate middle part of corresponding airscoop shroud import, be provided with air inlet kuppe, on below upper head plate middle part, be provided with combustion gas kuppe, in body of heater corresponding to air intake port, be provided with catalytic bed heater, below the bottom plate middle part of corresponding air leaving cover outlet, be provided with the kuppe of giving vent to anger, the air intake heater other end connects airscoop shroud by pipeline, air leaving cover connects catalysis gas inlet by pipeline, air intake duct is set for this kind of over-over mode and gas off-take can be realized the even air inlet of catalytic bed bottom of furnace body surrounding, thereby the industrial volatile organic pollutants that makes to enter body of heater is attracted to the surface of cat ceramic carrier more uniformly, make to burn evenly in body of heater, high-temperature gas after burning refluxes downwards evenly by gas off-take, make bottom of furnace body temperature-compensating even, overcome in prior art catalytic bed body of heater centre temperature high, the shortcoming that temperature low heating in edge is uneven, efficiency of combustion and purifying rate have been improved, through heat exchanger, catalytic bed catalytic combustion heat further can be utilized, realize energy-saving and emission-reduction.
2, the controlled energy-saving desorption system of this temperature is provided with air inlet kuppe on the upper head plate middle part of corresponding airscoop shroud import, on below upper head plate middle part, be provided with combustion gas kuppe, in body of heater corresponding to air intake port, be provided with heater, this heater is packed on body of heater peripheral board, below the bottom plate middle part of corresponding air leaving cover outlet, be provided with the kuppe of giving vent to anger, air inlet kuppe is positive rectangular pyramid structure, combustion gas kuppe and the kuppe of giving vent to anger are inverted positive rectangular pyramid structure, this kind of structural design can effectively realize even air inlet, evenly burning, the VOCs gas uniform burning enters gas off-take, effectively improve catalytic combustion bedside edge megadyne temperature degree, after entering into air leaving cover, evenly discharge, for furnace binding realizes high burning efficiency and purifying rate lays the first stone.
3, in the controlled energy-saving desorption system of Ben Wendu, front end is provided with air intake heater and in catalytic bed, is provided with catalytic bed heater, it is fast that this kind arranges firing rate, efficiency is high, be arranged on air intake port position, be conducive to abundant burning, improve purifying rate, thermocouple is installed in addition on sidewall of the furnace body and facilitates temperature monitoring in body of heater, improve security.
4, the controlled energy-saving desorption system of Ben Wendu adopts over-over mode that air intake duct and gas off-take are set, and effectively the recycling of catalytic combustion heat is performed to ultimate attainment.Utilize catalyst combustion reaction heat to carry out preheating to entering the gas of catalytic combustion bed.This warm belongs to countercurrent flow, for the high-temperature catalytic tail gas flowing through in the air flue being formed by coaming plate in body of heater and body of heater peripheral board, belongs to following current heat exchange for the air-flow in catalytic combustion bed, gas in air intake duct is heated in three directions, and make heat exchange unit to greatest extent near thermal source, reduce heat loss, improve heat exchange efficiency, to guarantee that catalytic combustion bed reaches catalysis initiation temperature at the stylish VOCs gas entering of normal combustion, contribute to maintain that catalyticing combustion process is stable carries out, reduce and even break away from the dependence to auxiliary electrical heater.
5, the high-temperature tail gas that in the controlled energy-saving desorption system of Ben Wendu, catalytic combustion produces is along gas off-take, it is the process that body of heater wall is back to catalytic combustion bed lower part outlet, catalytic combustion bed fringe region is carried out to back feeding heating, contribute to the maintenance of catalytic combustion bed ensemble temperature with even, impel catalytic combustion to be evenly distributed in whole catalytic combustion bed cross section, improve catalytic combustion purifying rate, and form benign cycle thus, be beneficial to catalytic combustion and carry out continually and steadily.
6, the air inlet kuppe and the combustion gas kuppe that in the controlled energy-saving desorption system of Ben Wendu, on upper head plate, arrange are design for disassembly, have facilitated the replacing of catalytic combustion pool furnace body inner catalyst, have improved production efficiency.
7, in the controlled energy-saving desorption system of Ben Wendu, air intake duct can be different from the quantity of gas off-take, also can be identical, air intake duct sectional area can equal gas off-take sectional area, air intake duct sectional area also can be greater than gas off-take sectional area, air intake duct sectional area can also be less than gas off-take sectional area, according to climate reasons, VOCs gas treatment amount and catalyst use amount, determine different air intake ducts and the cross-section relation between gas off-take, make it more adapt to the processing requirements of different situations.
8, in the controlled energy-saving desorption system of Ben Wendu air intake duct adopt rectangular steel pipe and be arranged on body of heater peripheral board with the interior coaming plate of body of heater between, gas off-take is surrounded by coaming plate in air intake duct rectangle steel tube wall, body of heater peripheral board and the body of heater of its both sides, this kind of mode design can effectively be reduced steel use amount, reduce construction costs, for energy-saving and cost-reducing new design, reach processing requirements completely.
9, in the controlled energy-saving desorption system of Ben Wendu, body of heater peripheral board cross section is rectangle or square or circular, in body of heater, coaming plate cross section is rectangle or square or circular, air intake duct cross section is rectangle or square or fan-shaped or circular or encircle fan-shapedly, and gas off-take cross section is rectangle or square or fan-shaped or circular or encircle fan-shaped.This kind of Structural Transformation mainly adapts to difform catalytic combustion bed profile, facilitates the design of various situations.
10, on the airscoop shroud in the controlled energy-saving desorption system of Ben Wendu, be provided with explosion-proof relief mouth, improved the security of catalytic combustion bed, prevent the generation of security incident.
11, the utility model heat exchanger is plate type heat exchanger, heat exchanger is provided with entrance and the desorption outlet of supplying gas of supplying gas of catalysis gas inlet, the outlet of catalysis tail gas, the import of catalysis gas, the outlet of catalysis gas, desorption, can more high efficiencyly utilize heat energy, reduce the dependence to electric energy.
12, the utility model has effectively improved the thermal efficiency of processing, reduce thermal losses, improve recuperation of heat utilization rate, in catalytic combustion bed during burning in desorption system, temperature is more even, efficiency of combustion and purifying rate have been improved, increased heat exchange and more rationally utilized heat energy, met energy-saving and emission-reduction requirement, the gas temperature of input catalytic bed can effectively be controlled.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is that the utility model airscoop shroud, body of heater, air leaving cover are in conjunction with schematic diagram;
Fig. 3 is the right view of Fig. 2;
Fig. 4 is that the A-A of Fig. 3 is to cutaway view;
Fig. 5 is the structural representation (omitting heater, heat-insulation layer, thermocouple and the kuppe of giving vent to anger) of the utility model body of heater;
Fig. 6 is that the B-B of Fig. 5 is to cutaway view (omit catalyst bracket and catalyst layer);
Fig. 7 is the top view of Fig. 5;
Fig. 8 is the upward view of Fig. 5;
Fig. 9 is the stereogram (omitting heater, heat-insulation layer, thermocouple, kuppe, catalyst bracket and catalyst layer) of the utility model body of heater;
Figure 10 is the utility model heat exchanger structure schematic diagram.
The specific embodiment
Below by specific embodiment, the utility model is described in further detail, and following examples are descriptive, is not determinate, can not limit protection domain of the present utility model with this.
The energy-saving desorption system that a kind of temperature is controlled, comprise air intake heater 6, catalytic bed, catalysis blower fan 10 and heat exchanger 11, catalytic bed comprises airscoop shroud 3, body of heater 5, air leaving cover 9, body of heater upper end is fixedly mounted with airscoop shroud, on airscoop shroud, be provided with explosion-proof relief mouth 2, body of heater lower end is fixedly mounted with air leaving cover, air intake heater connects airscoop shroud by pipeline, airscoop shroud upper end arranges gas feed 1, air leaving cover lower end arranges gas vent, body of heater comprise body of heater peripheral board 22 with and the bottom plate 8 that is fixedly mounted with of the upper head plate 4 that is fixedly mounted with of upper end and its lower end, it is evenly fixed with heat-insulation layer 16 at body of heater peripheral board outer wall, coaming plate 23 in one body of heater is set in body of heater peripheral board, in body of heater, between coaming plate and body of heater peripheral board, be arranged alternately air intake duct 13 and gas off-take 20, the import 24 of air intake duct is arranged on upper head plate, the outlet 21 of air intake duct is arranged between bottom plate and the interior coaming plate of body of heater, the import 12 of gas off-take is arranged between upper head plate and the interior coaming plate of body of heater, the outlet 25 of gas off-take is arranged on bottom plate, on the upper head plate middle part of corresponding airscoop shroud gas feed, be provided with air inlet kuppe 14, on below upper head plate middle part, be provided with combustion gas kuppe 15, in body of heater corresponding to air intake port, be provided with heater 7, this heater is packed on body of heater peripheral board, this heater is electric heating tube group, electric heating tube quantity can be determined according to actual conditions, below the bottom plate middle part of corresponding air leaving cover outlet, be provided with the kuppe 19 of giving vent to anger, air inlet kuppe is positive rectangular pyramid structure, combustion gas kuppe and the kuppe of giving vent to anger are inverted positive rectangular pyramid structure.In body of heater above heater, be provided with catalyst bracket 18, catalyst layer 17 is installed on catalyst bracket, heat exchanger is provided with catalysis gas inlet 26, catalysis tail gas outlet 31, catalysis gas import 28, catalysis gas outlet 27, desorption entrance 30 and the desorption outlet 29 of supplying gas of supplying gas, air leaving cover connects catalysis gas inlet by pipeline, and thermocouple is installed on sidewall of the furnace body.In the present embodiment, the quantity of thermocouple is three, be packed in respectively the upper of sidewall of the furnace body, in, lower three positions, the quantity of air intake duct and gas off-take is identical and be evenly alternately arranged in body of heater between coaming plate and body of heater peripheral board, air intake duct can be not identical with the quantity of gas off-take yet, described be arranged in body of heater the air intake duct in opposite between coaming plate and body of heater peripheral board and air intake duct can be one by one corresponding or air intake duct and gas off-take corresponding one by one, air intake duct shown in the present embodiment accompanying drawing 8 and gas off-take quantity are 20 and be evenly alternately arranged in body of heater between coaming plate and body of heater peripheral board, adopt air intake duct and gas off-take corresponding mode one by one, air intake duct sectional area can equal gas off-take sectional area, air intake duct sectional area also can be greater than gas off-take sectional area, air intake duct sectional area can also be less than gas off-take sectional area.For the air intake duct in energy-saving and cost-reducing this catalytic combustion pool furnace body structure adopts rectangular steel pipe and is arranged in body of heater peripheral board and body of heater between coaming plate, gas off-take is surrounded by coaming plate in air intake duct rectangle steel tube wall, body of heater peripheral board and the body of heater of its both sides, body of heater peripheral board cross section is rectangle or square or circular, in body of heater, coaming plate cross section is rectangle or square or circular, air intake duct cross section is rectangle or square or fan-shaped or circular or encircle fan-shapedly, and gas off-take cross section is rectangle or square or fan-shaped or circular or encircle fan-shaped.
The utility model in use VOCs gas enters through air inlet kuppe gas uniform and flows to the Fighter Inlet upper head plate from the import of airscoop shroud, by inlet duct flow, arrive catalytic combustion pool furnace body below, meeting bottom plate stops to turn back and enters in catalytic combustion pool furnace body, aperture through heater and cat ceramic honeycomb substrate burns, the combustion gas kuppe that gas after burning meets the inversion rectangular pyramid structure below end plate evenly enters the air intake duct rectangle steel tube wall by gas off-take both sides, the gas off-take that in body of heater peripheral board and body of heater, coaming plate surrounds, from gas off-take outlet, through the kuppe of giving vent to anger, evenly flow out air leaving cover outlet.
Actual motion compliance test result of the present utility model: this new catalytic burning bed furnace binding in actual use, after conventional preheating, passes into VOCs gas, after catalytic combustion occurs, cuts off electrical heating.Within VOCs gas concentration meets the period of minimum ignition concentration, realize self-sustaining burning completely, without any additional auxiliary thermal source, the catalyticing combustion process catalytic combustion bed tempertaure short time reaches 650 ℃, most time maintains between 400 ℃-500 ℃, and flameholding, fluctuates less.San Ge region, catalytic combustion bed upper, middle and lower temperature instrumentation reading approaches, and uniformity of temperature profile is described, exit gas detects, and VOCs purifying rate is not less than 98%, meets relevant national standard requirement completely.
Claims (10)
1. the energy-saving desorption system that temperature is controlled, it is characterized in that: comprise air intake heater, catalytic bed, catalysis blower fan and heat exchanger, heat exchanger is provided with catalysis gas inlet, the outlet of catalysis tail gas, the import of catalysis gas, the outlet of catalysis gas, desorption entrance and the desorption outlet of supplying gas of supplying gas, catalysis blower and pipeline connects the import of catalysis gas, the outlet of catalysis gas connects air intake heater one end by pipeline, wherein catalytic bed comprises airscoop shroud, body of heater, air leaving cover, body of heater upper end is fixedly mounted with airscoop shroud, body of heater lower end is fixedly mounted with air leaving cover, body of heater comprise body of heater peripheral board with and the bottom plate that is fixedly mounted with of the upper head plate that is fixedly mounted with of upper end and its lower end, at body of heater peripheral board outer wall, be evenly fixed with heat-insulation layer, coaming plate in one body of heater is set in body of heater peripheral board, in body of heater, between coaming plate and body of heater peripheral board, be arranged alternately air intake duct and gas off-take, the import of air intake duct is arranged on upper head plate, the outlet of air intake duct is arranged between bottom plate and the interior coaming plate of body of heater, the import of gas off-take is arranged between upper head plate and the interior coaming plate of body of heater, the outlet of gas off-take is arranged on bottom plate, on the upper head plate middle part of corresponding airscoop shroud import, be provided with air inlet kuppe, on below upper head plate middle part, be provided with combustion gas kuppe, in body of heater corresponding to air intake port, be provided with catalytic bed heater, below the bottom plate middle part of corresponding air leaving cover outlet, be provided with the kuppe of giving vent to anger, the air intake heater other end connects airscoop shroud by pipeline, air leaving cover connects catalysis gas inlet by pipeline.
2. the controlled energy-saving desorption system of temperature according to claim 1, is characterized in that: described heat exchanger is plate type heat exchanger.
3. the controlled energy-saving desorption system of temperature according to claim 1, is characterized in that: described air intake duct is identical with the quantity of gas off-take and be evenly alternately arranged in body of heater between coaming plate and body of heater peripheral board.
4. the controlled energy-saving desorption system of temperature according to claim 1, is characterized in that: on described airscoop shroud, be provided with explosion-proof relief mouth.
5. the controlled energy-saving desorption system of temperature according to claim 1, is characterized in that: described air inlet kuppe is positive rectangular pyramid structure, and combustion gas kuppe and the kuppe of giving vent to anger are inverted positive rectangular pyramid structure.
6. the controlled energy-saving desorption system of temperature according to claim 1, is characterized in that: in the body of heater above described heater, be provided with catalyst bracket, catalyst layer is installed on catalyst bracket.
7. the energy-saving desorption system controlled according to the temperature described in claim 1 or 3, it is characterized in that: described air intake duct adopt rectangular steel pipe and be arranged on body of heater peripheral board with the interior coaming plate of body of heater between, gas off-take is surrounded by coaming plate in air intake duct rectangle steel tube wall, body of heater peripheral board and the body of heater of its both sides.
8. the controlled energy-saving desorption system of temperature according to claim 1, is characterized in that: described body of heater peripheral board cross section is rectangle or square or circular, and in body of heater, coaming plate cross section is rectangle or square or circular.
9. the controlled energy-saving desorption system of temperature according to claim 1, is characterized in that: described catalytic bed heater is electric heating tube group.
10. the controlled energy-saving desorption system of temperature according to claim 1, it is characterized in that: described air intake duct cross section is rectangle or square or fan-shaped or circular or encircle fan-shapedly, and gas off-take cross section is rectangle or square or fan-shaped or circular or encircle fan-shaped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320606978.3U CN203517830U (en) | 2013-09-27 | 2013-09-27 | Energy-saving desorption system with controllable temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320606978.3U CN203517830U (en) | 2013-09-27 | 2013-09-27 | Energy-saving desorption system with controllable temperature |
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| CN203517830U true CN203517830U (en) | 2014-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320606978.3U Withdrawn - After Issue CN203517830U (en) | 2013-09-27 | 2013-09-27 | Energy-saving desorption system with controllable temperature |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103486599A (en) * | 2013-09-27 | 2014-01-01 | 天津赛智科技发展有限公司 | Temperature-controllable energy-saving desorption system |
-
2013
- 2013-09-27 CN CN201320606978.3U patent/CN203517830U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103486599A (en) * | 2013-09-27 | 2014-01-01 | 天津赛智科技发展有限公司 | Temperature-controllable energy-saving desorption system |
| CN103486599B (en) * | 2013-09-27 | 2015-09-09 | 天津赛智科技发展有限公司 | The energy-saving desorption system of temperature-controllable |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140402 Effective date of abandoning: 20150909 |
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| RGAV | Abandon patent right to avoid regrant |